1179a0cc4SSteven Rostedt (VMware) // SPDX-License-Identifier: GPL-2.0 22541517cSAlexei Starovoitov /* Copyright (c) 2011-2015 PLUMgrid, http://plumgrid.com 30515e599SAlexei Starovoitov * Copyright (c) 2016 Facebook 42541517cSAlexei Starovoitov */ 52541517cSAlexei Starovoitov #include <linux/kernel.h> 62541517cSAlexei Starovoitov #include <linux/types.h> 72541517cSAlexei Starovoitov #include <linux/slab.h> 82541517cSAlexei Starovoitov #include <linux/bpf.h> 94279adb0SMartin KaFai Lau #include <linux/bpf_verifier.h> 100515e599SAlexei Starovoitov #include <linux/bpf_perf_event.h> 11c4d0bfb4SAlan Maguire #include <linux/btf.h> 122541517cSAlexei Starovoitov #include <linux/filter.h> 132541517cSAlexei Starovoitov #include <linux/uaccess.h> 149c959c86SAlexei Starovoitov #include <linux/ctype.h> 159802d865SJosef Bacik #include <linux/kprobes.h> 16ac5a72eaSAlan Maguire #include <linux/spinlock.h> 1741bdc4b4SYonghong Song #include <linux/syscalls.h> 18540adea3SMasami Hiramatsu #include <linux/error-injection.h> 19c9a0f3b8SJiri Olsa #include <linux/btf_ids.h> 206f100640SKP Singh #include <linux/bpf_lsm.h> 210dcac272SJiri Olsa #include <linux/fprobe.h> 22ca74823cSJiri Olsa #include <linux/bsearch.h> 23ca74823cSJiri Olsa #include <linux/sort.h> 24f3cf4134SRoberto Sassu #include <linux/key.h> 25f3cf4134SRoberto Sassu #include <linux/verification.h> 266f100640SKP Singh 278e4597c6SMartin KaFai Lau #include <net/bpf_sk_storage.h> 289802d865SJosef Bacik 29c4d0bfb4SAlan Maguire #include <uapi/linux/bpf.h> 30c4d0bfb4SAlan Maguire #include <uapi/linux/btf.h> 31c4d0bfb4SAlan Maguire 32c7b6f29bSNadav Amit #include <asm/tlb.h> 33c7b6f29bSNadav Amit 349802d865SJosef Bacik #include "trace_probe.h" 352541517cSAlexei Starovoitov #include "trace.h" 362541517cSAlexei Starovoitov 37ac5a72eaSAlan Maguire #define CREATE_TRACE_POINTS 38ac5a72eaSAlan Maguire #include "bpf_trace.h" 39ac5a72eaSAlan Maguire 40e672db03SStanislav Fomichev #define bpf_event_rcu_dereference(p) \ 41e672db03SStanislav Fomichev rcu_dereference_protected(p, lockdep_is_held(&bpf_event_mutex)) 42e672db03SStanislav Fomichev 43a38d1107SMatt Mullins #ifdef CONFIG_MODULES 44a38d1107SMatt Mullins struct bpf_trace_module { 45a38d1107SMatt Mullins struct module *module; 46a38d1107SMatt Mullins struct list_head list; 47a38d1107SMatt Mullins }; 48a38d1107SMatt Mullins 49a38d1107SMatt Mullins static LIST_HEAD(bpf_trace_modules); 50a38d1107SMatt Mullins static DEFINE_MUTEX(bpf_module_mutex); 51a38d1107SMatt Mullins 52a38d1107SMatt Mullins static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) 53a38d1107SMatt Mullins { 54a38d1107SMatt Mullins struct bpf_raw_event_map *btp, *ret = NULL; 55a38d1107SMatt Mullins struct bpf_trace_module *btm; 56a38d1107SMatt Mullins unsigned int i; 57a38d1107SMatt Mullins 58a38d1107SMatt Mullins mutex_lock(&bpf_module_mutex); 59a38d1107SMatt Mullins list_for_each_entry(btm, &bpf_trace_modules, list) { 60a38d1107SMatt Mullins for (i = 0; i < btm->module->num_bpf_raw_events; ++i) { 61a38d1107SMatt Mullins btp = &btm->module->bpf_raw_events[i]; 62a38d1107SMatt Mullins if (!strcmp(btp->tp->name, name)) { 63a38d1107SMatt Mullins if (try_module_get(btm->module)) 64a38d1107SMatt Mullins ret = btp; 65a38d1107SMatt Mullins goto out; 66a38d1107SMatt Mullins } 67a38d1107SMatt Mullins } 68a38d1107SMatt Mullins } 69a38d1107SMatt Mullins out: 70a38d1107SMatt Mullins mutex_unlock(&bpf_module_mutex); 71a38d1107SMatt Mullins return ret; 72a38d1107SMatt Mullins } 73a38d1107SMatt Mullins #else 74a38d1107SMatt Mullins static struct bpf_raw_event_map *bpf_get_raw_tracepoint_module(const char *name) 75a38d1107SMatt Mullins { 76a38d1107SMatt Mullins return NULL; 77a38d1107SMatt Mullins } 78a38d1107SMatt Mullins #endif /* CONFIG_MODULES */ 79a38d1107SMatt Mullins 80035226b9SGianluca Borello u64 bpf_get_stackid(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 81c195651eSYonghong Song u64 bpf_get_stack(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 82035226b9SGianluca Borello 83eb411377SAlan Maguire static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, 84eb411377SAlan Maguire u64 flags, const struct btf **btf, 85eb411377SAlan Maguire s32 *btf_id); 86f7098690SJiri Olsa static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx); 87f7098690SJiri Olsa static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx); 88eb411377SAlan Maguire 892541517cSAlexei Starovoitov /** 902541517cSAlexei Starovoitov * trace_call_bpf - invoke BPF program 91e87c6bc3SYonghong Song * @call: tracepoint event 922541517cSAlexei Starovoitov * @ctx: opaque context pointer 932541517cSAlexei Starovoitov * 942541517cSAlexei Starovoitov * kprobe handlers execute BPF programs via this helper. 952541517cSAlexei Starovoitov * Can be used from static tracepoints in the future. 962541517cSAlexei Starovoitov * 972541517cSAlexei Starovoitov * Return: BPF programs always return an integer which is interpreted by 982541517cSAlexei Starovoitov * kprobe handler as: 992541517cSAlexei Starovoitov * 0 - return from kprobe (event is filtered out) 1002541517cSAlexei Starovoitov * 1 - store kprobe event into ring buffer 1012541517cSAlexei Starovoitov * Other values are reserved and currently alias to 1 1022541517cSAlexei Starovoitov */ 103e87c6bc3SYonghong Song unsigned int trace_call_bpf(struct trace_event_call *call, void *ctx) 1042541517cSAlexei Starovoitov { 1052541517cSAlexei Starovoitov unsigned int ret; 1062541517cSAlexei Starovoitov 107b0a81b94SThomas Gleixner cant_sleep(); 1082541517cSAlexei Starovoitov 1092541517cSAlexei Starovoitov if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { 1102541517cSAlexei Starovoitov /* 1112541517cSAlexei Starovoitov * since some bpf program is already running on this cpu, 1122541517cSAlexei Starovoitov * don't call into another bpf program (same or different) 1132541517cSAlexei Starovoitov * and don't send kprobe event into ring-buffer, 1142541517cSAlexei Starovoitov * so return zero here 1152541517cSAlexei Starovoitov */ 1162541517cSAlexei Starovoitov ret = 0; 1172541517cSAlexei Starovoitov goto out; 1182541517cSAlexei Starovoitov } 1192541517cSAlexei Starovoitov 120e87c6bc3SYonghong Song /* 121e87c6bc3SYonghong Song * Instead of moving rcu_read_lock/rcu_dereference/rcu_read_unlock 122e87c6bc3SYonghong Song * to all call sites, we did a bpf_prog_array_valid() there to check 123e87c6bc3SYonghong Song * whether call->prog_array is empty or not, which is 1242b5894ccSQiujun Huang * a heuristic to speed up execution. 125e87c6bc3SYonghong Song * 126e87c6bc3SYonghong Song * If bpf_prog_array_valid() fetched prog_array was 127e87c6bc3SYonghong Song * non-NULL, we go into trace_call_bpf() and do the actual 128e87c6bc3SYonghong Song * proper rcu_dereference() under RCU lock. 129e87c6bc3SYonghong Song * If it turns out that prog_array is NULL then, we bail out. 130e87c6bc3SYonghong Song * For the opposite, if the bpf_prog_array_valid() fetched pointer 131e87c6bc3SYonghong Song * was NULL, you'll skip the prog_array with the risk of missing 132e87c6bc3SYonghong Song * out of events when it was updated in between this and the 133e87c6bc3SYonghong Song * rcu_dereference() which is accepted risk. 134e87c6bc3SYonghong Song */ 135055eb955SStanislav Fomichev rcu_read_lock(); 136055eb955SStanislav Fomichev ret = bpf_prog_run_array(rcu_dereference(call->prog_array), 137055eb955SStanislav Fomichev ctx, bpf_prog_run); 138055eb955SStanislav Fomichev rcu_read_unlock(); 1392541517cSAlexei Starovoitov 1402541517cSAlexei Starovoitov out: 1412541517cSAlexei Starovoitov __this_cpu_dec(bpf_prog_active); 1422541517cSAlexei Starovoitov 1432541517cSAlexei Starovoitov return ret; 1442541517cSAlexei Starovoitov } 1452541517cSAlexei Starovoitov 1469802d865SJosef Bacik #ifdef CONFIG_BPF_KPROBE_OVERRIDE 1479802d865SJosef Bacik BPF_CALL_2(bpf_override_return, struct pt_regs *, regs, unsigned long, rc) 1489802d865SJosef Bacik { 1499802d865SJosef Bacik regs_set_return_value(regs, rc); 150540adea3SMasami Hiramatsu override_function_with_return(regs); 1519802d865SJosef Bacik return 0; 1529802d865SJosef Bacik } 1539802d865SJosef Bacik 1549802d865SJosef Bacik static const struct bpf_func_proto bpf_override_return_proto = { 1559802d865SJosef Bacik .func = bpf_override_return, 1569802d865SJosef Bacik .gpl_only = true, 1579802d865SJosef Bacik .ret_type = RET_INTEGER, 1589802d865SJosef Bacik .arg1_type = ARG_PTR_TO_CTX, 1599802d865SJosef Bacik .arg2_type = ARG_ANYTHING, 1609802d865SJosef Bacik }; 1619802d865SJosef Bacik #endif 1629802d865SJosef Bacik 1638d92db5cSChristoph Hellwig static __always_inline int 1648d92db5cSChristoph Hellwig bpf_probe_read_user_common(void *dst, u32 size, const void __user *unsafe_ptr) 1658d92db5cSChristoph Hellwig { 1668d92db5cSChristoph Hellwig int ret; 1678d92db5cSChristoph Hellwig 168c0ee37e8SChristoph Hellwig ret = copy_from_user_nofault(dst, unsafe_ptr, size); 1698d92db5cSChristoph Hellwig if (unlikely(ret < 0)) 1708d92db5cSChristoph Hellwig memset(dst, 0, size); 1718d92db5cSChristoph Hellwig return ret; 1728d92db5cSChristoph Hellwig } 1738d92db5cSChristoph Hellwig 1746ae08ae3SDaniel Borkmann BPF_CALL_3(bpf_probe_read_user, void *, dst, u32, size, 1756ae08ae3SDaniel Borkmann const void __user *, unsafe_ptr) 1762541517cSAlexei Starovoitov { 1778d92db5cSChristoph Hellwig return bpf_probe_read_user_common(dst, size, unsafe_ptr); 1782541517cSAlexei Starovoitov } 1792541517cSAlexei Starovoitov 180f470378cSJohn Fastabend const struct bpf_func_proto bpf_probe_read_user_proto = { 1816ae08ae3SDaniel Borkmann .func = bpf_probe_read_user, 1826ae08ae3SDaniel Borkmann .gpl_only = true, 1836ae08ae3SDaniel Borkmann .ret_type = RET_INTEGER, 1846ae08ae3SDaniel Borkmann .arg1_type = ARG_PTR_TO_UNINIT_MEM, 1856ae08ae3SDaniel Borkmann .arg2_type = ARG_CONST_SIZE_OR_ZERO, 1866ae08ae3SDaniel Borkmann .arg3_type = ARG_ANYTHING, 1876ae08ae3SDaniel Borkmann }; 1886ae08ae3SDaniel Borkmann 1898d92db5cSChristoph Hellwig static __always_inline int 1908d92db5cSChristoph Hellwig bpf_probe_read_user_str_common(void *dst, u32 size, 1918d92db5cSChristoph Hellwig const void __user *unsafe_ptr) 1928d92db5cSChristoph Hellwig { 1938d92db5cSChristoph Hellwig int ret; 1948d92db5cSChristoph Hellwig 1956fa6d280SDaniel Xu /* 1966fa6d280SDaniel Xu * NB: We rely on strncpy_from_user() not copying junk past the NUL 1976fa6d280SDaniel Xu * terminator into `dst`. 1986fa6d280SDaniel Xu * 1996fa6d280SDaniel Xu * strncpy_from_user() does long-sized strides in the fast path. If the 2006fa6d280SDaniel Xu * strncpy does not mask out the bytes after the NUL in `unsafe_ptr`, 2016fa6d280SDaniel Xu * then there could be junk after the NUL in `dst`. If user takes `dst` 2026fa6d280SDaniel Xu * and keys a hash map with it, then semantically identical strings can 2036fa6d280SDaniel Xu * occupy multiple entries in the map. 2046fa6d280SDaniel Xu */ 2058d92db5cSChristoph Hellwig ret = strncpy_from_user_nofault(dst, unsafe_ptr, size); 2068d92db5cSChristoph Hellwig if (unlikely(ret < 0)) 2078d92db5cSChristoph Hellwig memset(dst, 0, size); 2088d92db5cSChristoph Hellwig return ret; 2098d92db5cSChristoph Hellwig } 2108d92db5cSChristoph Hellwig 2116ae08ae3SDaniel Borkmann BPF_CALL_3(bpf_probe_read_user_str, void *, dst, u32, size, 2126ae08ae3SDaniel Borkmann const void __user *, unsafe_ptr) 2136ae08ae3SDaniel Borkmann { 2148d92db5cSChristoph Hellwig return bpf_probe_read_user_str_common(dst, size, unsafe_ptr); 2156ae08ae3SDaniel Borkmann } 2166ae08ae3SDaniel Borkmann 217f470378cSJohn Fastabend const struct bpf_func_proto bpf_probe_read_user_str_proto = { 2186ae08ae3SDaniel Borkmann .func = bpf_probe_read_user_str, 2196ae08ae3SDaniel Borkmann .gpl_only = true, 2206ae08ae3SDaniel Borkmann .ret_type = RET_INTEGER, 2216ae08ae3SDaniel Borkmann .arg1_type = ARG_PTR_TO_UNINIT_MEM, 2226ae08ae3SDaniel Borkmann .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2236ae08ae3SDaniel Borkmann .arg3_type = ARG_ANYTHING, 2246ae08ae3SDaniel Borkmann }; 2256ae08ae3SDaniel Borkmann 2266ae08ae3SDaniel Borkmann BPF_CALL_3(bpf_probe_read_kernel, void *, dst, u32, size, 2276ae08ae3SDaniel Borkmann const void *, unsafe_ptr) 2286ae08ae3SDaniel Borkmann { 2298d92db5cSChristoph Hellwig return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); 2306ae08ae3SDaniel Borkmann } 2316ae08ae3SDaniel Borkmann 232f470378cSJohn Fastabend const struct bpf_func_proto bpf_probe_read_kernel_proto = { 2336ae08ae3SDaniel Borkmann .func = bpf_probe_read_kernel, 2346ae08ae3SDaniel Borkmann .gpl_only = true, 2356ae08ae3SDaniel Borkmann .ret_type = RET_INTEGER, 2366ae08ae3SDaniel Borkmann .arg1_type = ARG_PTR_TO_UNINIT_MEM, 2376ae08ae3SDaniel Borkmann .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2386ae08ae3SDaniel Borkmann .arg3_type = ARG_ANYTHING, 2396ae08ae3SDaniel Borkmann }; 2406ae08ae3SDaniel Borkmann 2416ae08ae3SDaniel Borkmann static __always_inline int 2428d92db5cSChristoph Hellwig bpf_probe_read_kernel_str_common(void *dst, u32 size, const void *unsafe_ptr) 2436ae08ae3SDaniel Borkmann { 244ff40e510SDaniel Borkmann int ret; 2458d92db5cSChristoph Hellwig 2466ae08ae3SDaniel Borkmann /* 2478d92db5cSChristoph Hellwig * The strncpy_from_kernel_nofault() call will likely not fill the 2488d92db5cSChristoph Hellwig * entire buffer, but that's okay in this circumstance as we're probing 2496ae08ae3SDaniel Borkmann * arbitrary memory anyway similar to bpf_probe_read_*() and might 2506ae08ae3SDaniel Borkmann * as well probe the stack. Thus, memory is explicitly cleared 2516ae08ae3SDaniel Borkmann * only in error case, so that improper users ignoring return 2526ae08ae3SDaniel Borkmann * code altogether don't copy garbage; otherwise length of string 2536ae08ae3SDaniel Borkmann * is returned that can be used for bpf_perf_event_output() et al. 2546ae08ae3SDaniel Borkmann */ 2558d92db5cSChristoph Hellwig ret = strncpy_from_kernel_nofault(dst, unsafe_ptr, size); 2566ae08ae3SDaniel Borkmann if (unlikely(ret < 0)) 2576ae08ae3SDaniel Borkmann memset(dst, 0, size); 2586ae08ae3SDaniel Borkmann return ret; 2596ae08ae3SDaniel Borkmann } 2606ae08ae3SDaniel Borkmann 2616ae08ae3SDaniel Borkmann BPF_CALL_3(bpf_probe_read_kernel_str, void *, dst, u32, size, 2626ae08ae3SDaniel Borkmann const void *, unsafe_ptr) 2636ae08ae3SDaniel Borkmann { 2648d92db5cSChristoph Hellwig return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); 2656ae08ae3SDaniel Borkmann } 2666ae08ae3SDaniel Borkmann 267f470378cSJohn Fastabend const struct bpf_func_proto bpf_probe_read_kernel_str_proto = { 2686ae08ae3SDaniel Borkmann .func = bpf_probe_read_kernel_str, 2696ae08ae3SDaniel Borkmann .gpl_only = true, 2706ae08ae3SDaniel Borkmann .ret_type = RET_INTEGER, 2716ae08ae3SDaniel Borkmann .arg1_type = ARG_PTR_TO_UNINIT_MEM, 2726ae08ae3SDaniel Borkmann .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2736ae08ae3SDaniel Borkmann .arg3_type = ARG_ANYTHING, 2746ae08ae3SDaniel Borkmann }; 2756ae08ae3SDaniel Borkmann 2768d92db5cSChristoph Hellwig #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 2778d92db5cSChristoph Hellwig BPF_CALL_3(bpf_probe_read_compat, void *, dst, u32, size, 2788d92db5cSChristoph Hellwig const void *, unsafe_ptr) 2798d92db5cSChristoph Hellwig { 2808d92db5cSChristoph Hellwig if ((unsigned long)unsafe_ptr < TASK_SIZE) { 2818d92db5cSChristoph Hellwig return bpf_probe_read_user_common(dst, size, 2828d92db5cSChristoph Hellwig (__force void __user *)unsafe_ptr); 2838d92db5cSChristoph Hellwig } 2848d92db5cSChristoph Hellwig return bpf_probe_read_kernel_common(dst, size, unsafe_ptr); 2858d92db5cSChristoph Hellwig } 2868d92db5cSChristoph Hellwig 2878d92db5cSChristoph Hellwig static const struct bpf_func_proto bpf_probe_read_compat_proto = { 2888d92db5cSChristoph Hellwig .func = bpf_probe_read_compat, 2898d92db5cSChristoph Hellwig .gpl_only = true, 2908d92db5cSChristoph Hellwig .ret_type = RET_INTEGER, 2918d92db5cSChristoph Hellwig .arg1_type = ARG_PTR_TO_UNINIT_MEM, 2928d92db5cSChristoph Hellwig .arg2_type = ARG_CONST_SIZE_OR_ZERO, 2938d92db5cSChristoph Hellwig .arg3_type = ARG_ANYTHING, 2948d92db5cSChristoph Hellwig }; 2958d92db5cSChristoph Hellwig 2966ae08ae3SDaniel Borkmann BPF_CALL_3(bpf_probe_read_compat_str, void *, dst, u32, size, 2976ae08ae3SDaniel Borkmann const void *, unsafe_ptr) 2986ae08ae3SDaniel Borkmann { 2998d92db5cSChristoph Hellwig if ((unsigned long)unsafe_ptr < TASK_SIZE) { 3008d92db5cSChristoph Hellwig return bpf_probe_read_user_str_common(dst, size, 3018d92db5cSChristoph Hellwig (__force void __user *)unsafe_ptr); 3028d92db5cSChristoph Hellwig } 3038d92db5cSChristoph Hellwig return bpf_probe_read_kernel_str_common(dst, size, unsafe_ptr); 3046ae08ae3SDaniel Borkmann } 3056ae08ae3SDaniel Borkmann 3066ae08ae3SDaniel Borkmann static const struct bpf_func_proto bpf_probe_read_compat_str_proto = { 3076ae08ae3SDaniel Borkmann .func = bpf_probe_read_compat_str, 3082541517cSAlexei Starovoitov .gpl_only = true, 3092541517cSAlexei Starovoitov .ret_type = RET_INTEGER, 31039f19ebbSAlexei Starovoitov .arg1_type = ARG_PTR_TO_UNINIT_MEM, 3119c019e2bSYonghong Song .arg2_type = ARG_CONST_SIZE_OR_ZERO, 3122541517cSAlexei Starovoitov .arg3_type = ARG_ANYTHING, 3132541517cSAlexei Starovoitov }; 3148d92db5cSChristoph Hellwig #endif /* CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE */ 3152541517cSAlexei Starovoitov 316eb1b6688SDaniel Borkmann BPF_CALL_3(bpf_probe_write_user, void __user *, unsafe_ptr, const void *, src, 317f3694e00SDaniel Borkmann u32, size) 31896ae5227SSargun Dhillon { 31996ae5227SSargun Dhillon /* 32096ae5227SSargun Dhillon * Ensure we're in user context which is safe for the helper to 32196ae5227SSargun Dhillon * run. This helper has no business in a kthread. 32296ae5227SSargun Dhillon * 32396ae5227SSargun Dhillon * access_ok() should prevent writing to non-user memory, but in 32496ae5227SSargun Dhillon * some situations (nommu, temporary switch, etc) access_ok() does 32596ae5227SSargun Dhillon * not provide enough validation, hence the check on KERNEL_DS. 326c7b6f29bSNadav Amit * 327c7b6f29bSNadav Amit * nmi_uaccess_okay() ensures the probe is not run in an interim 328c7b6f29bSNadav Amit * state, when the task or mm are switched. This is specifically 329c7b6f29bSNadav Amit * required to prevent the use of temporary mm. 33096ae5227SSargun Dhillon */ 33196ae5227SSargun Dhillon 33296ae5227SSargun Dhillon if (unlikely(in_interrupt() || 33396ae5227SSargun Dhillon current->flags & (PF_KTHREAD | PF_EXITING))) 33496ae5227SSargun Dhillon return -EPERM; 335c7b6f29bSNadav Amit if (unlikely(!nmi_uaccess_okay())) 336c7b6f29bSNadav Amit return -EPERM; 33796ae5227SSargun Dhillon 338c0ee37e8SChristoph Hellwig return copy_to_user_nofault(unsafe_ptr, src, size); 33996ae5227SSargun Dhillon } 34096ae5227SSargun Dhillon 34196ae5227SSargun Dhillon static const struct bpf_func_proto bpf_probe_write_user_proto = { 34296ae5227SSargun Dhillon .func = bpf_probe_write_user, 34396ae5227SSargun Dhillon .gpl_only = true, 34496ae5227SSargun Dhillon .ret_type = RET_INTEGER, 34596ae5227SSargun Dhillon .arg1_type = ARG_ANYTHING, 346216e3cd2SHao Luo .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 34739f19ebbSAlexei Starovoitov .arg3_type = ARG_CONST_SIZE, 34896ae5227SSargun Dhillon }; 34996ae5227SSargun Dhillon 35096ae5227SSargun Dhillon static const struct bpf_func_proto *bpf_get_probe_write_proto(void) 35196ae5227SSargun Dhillon { 3522c78ee89SAlexei Starovoitov if (!capable(CAP_SYS_ADMIN)) 3532c78ee89SAlexei Starovoitov return NULL; 3542c78ee89SAlexei Starovoitov 35596ae5227SSargun Dhillon pr_warn_ratelimited("%s[%d] is installing a program with bpf_probe_write_user helper that may corrupt user memory!", 35696ae5227SSargun Dhillon current->comm, task_pid_nr(current)); 35796ae5227SSargun Dhillon 35896ae5227SSargun Dhillon return &bpf_probe_write_user_proto; 35996ae5227SSargun Dhillon } 36096ae5227SSargun Dhillon 361d9c9e4dbSFlorent Revest #define MAX_TRACE_PRINTK_VARARGS 3 362ac5a72eaSAlan Maguire #define BPF_TRACE_PRINTK_SIZE 1024 363ac5a72eaSAlan Maguire 364f3694e00SDaniel Borkmann BPF_CALL_5(bpf_trace_printk, char *, fmt, u32, fmt_size, u64, arg1, 365f3694e00SDaniel Borkmann u64, arg2, u64, arg3) 3669c959c86SAlexei Starovoitov { 367d9c9e4dbSFlorent Revest u64 args[MAX_TRACE_PRINTK_VARARGS] = { arg1, arg2, arg3 }; 36878aa1cc9SJiri Olsa struct bpf_bprintf_data data = { 36978aa1cc9SJiri Olsa .get_bin_args = true, 370e2bb9e01SJiri Olsa .get_buf = true, 37178aa1cc9SJiri Olsa }; 372d9c9e4dbSFlorent Revest int ret; 3739c959c86SAlexei Starovoitov 37478aa1cc9SJiri Olsa ret = bpf_bprintf_prepare(fmt, fmt_size, args, 37578aa1cc9SJiri Olsa MAX_TRACE_PRINTK_VARARGS, &data); 376d9c9e4dbSFlorent Revest if (ret < 0) 377d9c9e4dbSFlorent Revest return ret; 3789c959c86SAlexei Starovoitov 379e2bb9e01SJiri Olsa ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); 3809c959c86SAlexei Starovoitov 381e2bb9e01SJiri Olsa trace_bpf_trace_printk(data.buf); 3829c959c86SAlexei Starovoitov 383f19a4050SJiri Olsa bpf_bprintf_cleanup(&data); 3849c959c86SAlexei Starovoitov 385d9c9e4dbSFlorent Revest return ret; 3869c959c86SAlexei Starovoitov } 3879c959c86SAlexei Starovoitov 3889c959c86SAlexei Starovoitov static const struct bpf_func_proto bpf_trace_printk_proto = { 3899c959c86SAlexei Starovoitov .func = bpf_trace_printk, 3909c959c86SAlexei Starovoitov .gpl_only = true, 3919c959c86SAlexei Starovoitov .ret_type = RET_INTEGER, 392216e3cd2SHao Luo .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, 39339f19ebbSAlexei Starovoitov .arg2_type = ARG_CONST_SIZE, 3949c959c86SAlexei Starovoitov }; 3959c959c86SAlexei Starovoitov 39610aceb62SDave Marchevsky static void __set_printk_clr_event(void) 3970756ea3eSAlexei Starovoitov { 3980756ea3eSAlexei Starovoitov /* 399ac5a72eaSAlan Maguire * This program might be calling bpf_trace_printk, 400ac5a72eaSAlan Maguire * so enable the associated bpf_trace/bpf_trace_printk event. 401ac5a72eaSAlan Maguire * Repeat this each time as it is possible a user has 402ac5a72eaSAlan Maguire * disabled bpf_trace_printk events. By loading a program 403ac5a72eaSAlan Maguire * calling bpf_trace_printk() however the user has expressed 404ac5a72eaSAlan Maguire * the intent to see such events. 4050756ea3eSAlexei Starovoitov */ 406ac5a72eaSAlan Maguire if (trace_set_clr_event("bpf_trace", "bpf_trace_printk", 1)) 407ac5a72eaSAlan Maguire pr_warn_ratelimited("could not enable bpf_trace_printk events"); 40810aceb62SDave Marchevsky } 4090756ea3eSAlexei Starovoitov 41010aceb62SDave Marchevsky const struct bpf_func_proto *bpf_get_trace_printk_proto(void) 41110aceb62SDave Marchevsky { 41210aceb62SDave Marchevsky __set_printk_clr_event(); 4130756ea3eSAlexei Starovoitov return &bpf_trace_printk_proto; 4140756ea3eSAlexei Starovoitov } 4150756ea3eSAlexei Starovoitov 41678aa1cc9SJiri Olsa BPF_CALL_4(bpf_trace_vprintk, char *, fmt, u32, fmt_size, const void *, args, 41710aceb62SDave Marchevsky u32, data_len) 41810aceb62SDave Marchevsky { 41978aa1cc9SJiri Olsa struct bpf_bprintf_data data = { 42078aa1cc9SJiri Olsa .get_bin_args = true, 421e2bb9e01SJiri Olsa .get_buf = true, 42278aa1cc9SJiri Olsa }; 42310aceb62SDave Marchevsky int ret, num_args; 42410aceb62SDave Marchevsky 42510aceb62SDave Marchevsky if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || 42678aa1cc9SJiri Olsa (data_len && !args)) 42710aceb62SDave Marchevsky return -EINVAL; 42810aceb62SDave Marchevsky num_args = data_len / 8; 42910aceb62SDave Marchevsky 43078aa1cc9SJiri Olsa ret = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); 43110aceb62SDave Marchevsky if (ret < 0) 43210aceb62SDave Marchevsky return ret; 43310aceb62SDave Marchevsky 434e2bb9e01SJiri Olsa ret = bstr_printf(data.buf, MAX_BPRINTF_BUF, fmt, data.bin_args); 43510aceb62SDave Marchevsky 436e2bb9e01SJiri Olsa trace_bpf_trace_printk(data.buf); 43710aceb62SDave Marchevsky 438f19a4050SJiri Olsa bpf_bprintf_cleanup(&data); 43910aceb62SDave Marchevsky 44010aceb62SDave Marchevsky return ret; 44110aceb62SDave Marchevsky } 44210aceb62SDave Marchevsky 44310aceb62SDave Marchevsky static const struct bpf_func_proto bpf_trace_vprintk_proto = { 44410aceb62SDave Marchevsky .func = bpf_trace_vprintk, 44510aceb62SDave Marchevsky .gpl_only = true, 44610aceb62SDave Marchevsky .ret_type = RET_INTEGER, 447216e3cd2SHao Luo .arg1_type = ARG_PTR_TO_MEM | MEM_RDONLY, 44810aceb62SDave Marchevsky .arg2_type = ARG_CONST_SIZE, 449216e3cd2SHao Luo .arg3_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 45010aceb62SDave Marchevsky .arg4_type = ARG_CONST_SIZE_OR_ZERO, 45110aceb62SDave Marchevsky }; 45210aceb62SDave Marchevsky 45310aceb62SDave Marchevsky const struct bpf_func_proto *bpf_get_trace_vprintk_proto(void) 45410aceb62SDave Marchevsky { 45510aceb62SDave Marchevsky __set_printk_clr_event(); 45610aceb62SDave Marchevsky return &bpf_trace_vprintk_proto; 45710aceb62SDave Marchevsky } 45810aceb62SDave Marchevsky 459492e639fSYonghong Song BPF_CALL_5(bpf_seq_printf, struct seq_file *, m, char *, fmt, u32, fmt_size, 46078aa1cc9SJiri Olsa const void *, args, u32, data_len) 461492e639fSYonghong Song { 46278aa1cc9SJiri Olsa struct bpf_bprintf_data data = { 46378aa1cc9SJiri Olsa .get_bin_args = true, 46478aa1cc9SJiri Olsa }; 465d9c9e4dbSFlorent Revest int err, num_args; 466492e639fSYonghong Song 467335ff499SDave Marchevsky if (data_len & 7 || data_len > MAX_BPRINTF_VARARGS * 8 || 46878aa1cc9SJiri Olsa (data_len && !args)) 469d9c9e4dbSFlorent Revest return -EINVAL; 470492e639fSYonghong Song num_args = data_len / 8; 471492e639fSYonghong Song 47278aa1cc9SJiri Olsa err = bpf_bprintf_prepare(fmt, fmt_size, args, num_args, &data); 473492e639fSYonghong Song if (err < 0) 474d9c9e4dbSFlorent Revest return err; 475492e639fSYonghong Song 47678aa1cc9SJiri Olsa seq_bprintf(m, fmt, data.bin_args); 477492e639fSYonghong Song 478f19a4050SJiri Olsa bpf_bprintf_cleanup(&data); 479d9c9e4dbSFlorent Revest 480d9c9e4dbSFlorent Revest return seq_has_overflowed(m) ? -EOVERFLOW : 0; 481492e639fSYonghong Song } 482492e639fSYonghong Song 4839436ef6eSLorenz Bauer BTF_ID_LIST_SINGLE(btf_seq_file_ids, struct, seq_file) 484c9a0f3b8SJiri Olsa 485492e639fSYonghong Song static const struct bpf_func_proto bpf_seq_printf_proto = { 486492e639fSYonghong Song .func = bpf_seq_printf, 487492e639fSYonghong Song .gpl_only = true, 488492e639fSYonghong Song .ret_type = RET_INTEGER, 489492e639fSYonghong Song .arg1_type = ARG_PTR_TO_BTF_ID, 4909436ef6eSLorenz Bauer .arg1_btf_id = &btf_seq_file_ids[0], 491216e3cd2SHao Luo .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 492492e639fSYonghong Song .arg3_type = ARG_CONST_SIZE, 493216e3cd2SHao Luo .arg4_type = ARG_PTR_TO_MEM | PTR_MAYBE_NULL | MEM_RDONLY, 494492e639fSYonghong Song .arg5_type = ARG_CONST_SIZE_OR_ZERO, 495492e639fSYonghong Song }; 496492e639fSYonghong Song 497492e639fSYonghong Song BPF_CALL_3(bpf_seq_write, struct seq_file *, m, const void *, data, u32, len) 498492e639fSYonghong Song { 499492e639fSYonghong Song return seq_write(m, data, len) ? -EOVERFLOW : 0; 500492e639fSYonghong Song } 501492e639fSYonghong Song 502492e639fSYonghong Song static const struct bpf_func_proto bpf_seq_write_proto = { 503492e639fSYonghong Song .func = bpf_seq_write, 504492e639fSYonghong Song .gpl_only = true, 505492e639fSYonghong Song .ret_type = RET_INTEGER, 506492e639fSYonghong Song .arg1_type = ARG_PTR_TO_BTF_ID, 5079436ef6eSLorenz Bauer .arg1_btf_id = &btf_seq_file_ids[0], 508216e3cd2SHao Luo .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 509492e639fSYonghong Song .arg3_type = ARG_CONST_SIZE_OR_ZERO, 510492e639fSYonghong Song }; 511492e639fSYonghong Song 512eb411377SAlan Maguire BPF_CALL_4(bpf_seq_printf_btf, struct seq_file *, m, struct btf_ptr *, ptr, 513eb411377SAlan Maguire u32, btf_ptr_size, u64, flags) 514eb411377SAlan Maguire { 515eb411377SAlan Maguire const struct btf *btf; 516eb411377SAlan Maguire s32 btf_id; 517eb411377SAlan Maguire int ret; 518eb411377SAlan Maguire 519eb411377SAlan Maguire ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); 520eb411377SAlan Maguire if (ret) 521eb411377SAlan Maguire return ret; 522eb411377SAlan Maguire 523eb411377SAlan Maguire return btf_type_seq_show_flags(btf, btf_id, ptr->ptr, m, flags); 524eb411377SAlan Maguire } 525eb411377SAlan Maguire 526eb411377SAlan Maguire static const struct bpf_func_proto bpf_seq_printf_btf_proto = { 527eb411377SAlan Maguire .func = bpf_seq_printf_btf, 528eb411377SAlan Maguire .gpl_only = true, 529eb411377SAlan Maguire .ret_type = RET_INTEGER, 530eb411377SAlan Maguire .arg1_type = ARG_PTR_TO_BTF_ID, 531eb411377SAlan Maguire .arg1_btf_id = &btf_seq_file_ids[0], 532216e3cd2SHao Luo .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 533eb411377SAlan Maguire .arg3_type = ARG_CONST_SIZE_OR_ZERO, 534eb411377SAlan Maguire .arg4_type = ARG_ANYTHING, 535d9847d31SAlexei Starovoitov }; 536d9847d31SAlexei Starovoitov 537908432caSYonghong Song static __always_inline int 538908432caSYonghong Song get_map_perf_counter(struct bpf_map *map, u64 flags, 539908432caSYonghong Song u64 *value, u64 *enabled, u64 *running) 54035578d79SKaixu Xia { 54135578d79SKaixu Xia struct bpf_array *array = container_of(map, struct bpf_array, map); 5426816a7ffSDaniel Borkmann unsigned int cpu = smp_processor_id(); 5436816a7ffSDaniel Borkmann u64 index = flags & BPF_F_INDEX_MASK; 5443b1efb19SDaniel Borkmann struct bpf_event_entry *ee; 54535578d79SKaixu Xia 5466816a7ffSDaniel Borkmann if (unlikely(flags & ~(BPF_F_INDEX_MASK))) 5476816a7ffSDaniel Borkmann return -EINVAL; 5486816a7ffSDaniel Borkmann if (index == BPF_F_CURRENT_CPU) 5496816a7ffSDaniel Borkmann index = cpu; 55035578d79SKaixu Xia if (unlikely(index >= array->map.max_entries)) 55135578d79SKaixu Xia return -E2BIG; 55235578d79SKaixu Xia 5533b1efb19SDaniel Borkmann ee = READ_ONCE(array->ptrs[index]); 5541ca1cc98SDaniel Borkmann if (!ee) 55535578d79SKaixu Xia return -ENOENT; 55635578d79SKaixu Xia 557908432caSYonghong Song return perf_event_read_local(ee->event, value, enabled, running); 558908432caSYonghong Song } 559908432caSYonghong Song 560908432caSYonghong Song BPF_CALL_2(bpf_perf_event_read, struct bpf_map *, map, u64, flags) 561908432caSYonghong Song { 562908432caSYonghong Song u64 value = 0; 563908432caSYonghong Song int err; 564908432caSYonghong Song 565908432caSYonghong Song err = get_map_perf_counter(map, flags, &value, NULL, NULL); 56635578d79SKaixu Xia /* 567f91840a3SAlexei Starovoitov * this api is ugly since we miss [-22..-2] range of valid 568f91840a3SAlexei Starovoitov * counter values, but that's uapi 56935578d79SKaixu Xia */ 570f91840a3SAlexei Starovoitov if (err) 571f91840a3SAlexei Starovoitov return err; 572f91840a3SAlexei Starovoitov return value; 57335578d79SKaixu Xia } 57435578d79SKaixu Xia 57562544ce8SAlexei Starovoitov static const struct bpf_func_proto bpf_perf_event_read_proto = { 57635578d79SKaixu Xia .func = bpf_perf_event_read, 5771075ef59SAlexei Starovoitov .gpl_only = true, 57835578d79SKaixu Xia .ret_type = RET_INTEGER, 57935578d79SKaixu Xia .arg1_type = ARG_CONST_MAP_PTR, 58035578d79SKaixu Xia .arg2_type = ARG_ANYTHING, 58135578d79SKaixu Xia }; 58235578d79SKaixu Xia 583908432caSYonghong Song BPF_CALL_4(bpf_perf_event_read_value, struct bpf_map *, map, u64, flags, 584908432caSYonghong Song struct bpf_perf_event_value *, buf, u32, size) 585908432caSYonghong Song { 586908432caSYonghong Song int err = -EINVAL; 587908432caSYonghong Song 588908432caSYonghong Song if (unlikely(size != sizeof(struct bpf_perf_event_value))) 589908432caSYonghong Song goto clear; 590908432caSYonghong Song err = get_map_perf_counter(map, flags, &buf->counter, &buf->enabled, 591908432caSYonghong Song &buf->running); 592908432caSYonghong Song if (unlikely(err)) 593908432caSYonghong Song goto clear; 594908432caSYonghong Song return 0; 595908432caSYonghong Song clear: 596908432caSYonghong Song memset(buf, 0, size); 597908432caSYonghong Song return err; 598908432caSYonghong Song } 599908432caSYonghong Song 600908432caSYonghong Song static const struct bpf_func_proto bpf_perf_event_read_value_proto = { 601908432caSYonghong Song .func = bpf_perf_event_read_value, 602908432caSYonghong Song .gpl_only = true, 603908432caSYonghong Song .ret_type = RET_INTEGER, 604908432caSYonghong Song .arg1_type = ARG_CONST_MAP_PTR, 605908432caSYonghong Song .arg2_type = ARG_ANYTHING, 606908432caSYonghong Song .arg3_type = ARG_PTR_TO_UNINIT_MEM, 607908432caSYonghong Song .arg4_type = ARG_CONST_SIZE, 608908432caSYonghong Song }; 609908432caSYonghong Song 6108e7a3920SDaniel Borkmann static __always_inline u64 6118e7a3920SDaniel Borkmann __bpf_perf_event_output(struct pt_regs *regs, struct bpf_map *map, 612283ca526SDaniel Borkmann u64 flags, struct perf_sample_data *sd) 613a43eec30SAlexei Starovoitov { 614a43eec30SAlexei Starovoitov struct bpf_array *array = container_of(map, struct bpf_array, map); 615d7931330SDaniel Borkmann unsigned int cpu = smp_processor_id(); 6161e33759cSDaniel Borkmann u64 index = flags & BPF_F_INDEX_MASK; 6173b1efb19SDaniel Borkmann struct bpf_event_entry *ee; 618a43eec30SAlexei Starovoitov struct perf_event *event; 619a43eec30SAlexei Starovoitov 6201e33759cSDaniel Borkmann if (index == BPF_F_CURRENT_CPU) 621d7931330SDaniel Borkmann index = cpu; 622a43eec30SAlexei Starovoitov if (unlikely(index >= array->map.max_entries)) 623a43eec30SAlexei Starovoitov return -E2BIG; 624a43eec30SAlexei Starovoitov 6253b1efb19SDaniel Borkmann ee = READ_ONCE(array->ptrs[index]); 6261ca1cc98SDaniel Borkmann if (!ee) 627a43eec30SAlexei Starovoitov return -ENOENT; 628a43eec30SAlexei Starovoitov 6293b1efb19SDaniel Borkmann event = ee->event; 630a43eec30SAlexei Starovoitov if (unlikely(event->attr.type != PERF_TYPE_SOFTWARE || 631a43eec30SAlexei Starovoitov event->attr.config != PERF_COUNT_SW_BPF_OUTPUT)) 632a43eec30SAlexei Starovoitov return -EINVAL; 633a43eec30SAlexei Starovoitov 634d7931330SDaniel Borkmann if (unlikely(event->oncpu != cpu)) 635a43eec30SAlexei Starovoitov return -EOPNOTSUPP; 636a43eec30SAlexei Starovoitov 63756201969SArnaldo Carvalho de Melo return perf_event_output(event, sd, regs); 638a43eec30SAlexei Starovoitov } 639a43eec30SAlexei Starovoitov 6409594dc3cSMatt Mullins /* 6419594dc3cSMatt Mullins * Support executing tracepoints in normal, irq, and nmi context that each call 6429594dc3cSMatt Mullins * bpf_perf_event_output 6439594dc3cSMatt Mullins */ 6449594dc3cSMatt Mullins struct bpf_trace_sample_data { 6459594dc3cSMatt Mullins struct perf_sample_data sds[3]; 6469594dc3cSMatt Mullins }; 6479594dc3cSMatt Mullins 6489594dc3cSMatt Mullins static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_trace_sds); 6499594dc3cSMatt Mullins static DEFINE_PER_CPU(int, bpf_trace_nest_level); 650f3694e00SDaniel Borkmann BPF_CALL_5(bpf_perf_event_output, struct pt_regs *, regs, struct bpf_map *, map, 651f3694e00SDaniel Borkmann u64, flags, void *, data, u64, size) 6528e7a3920SDaniel Borkmann { 653f2c67a3eSJiri Olsa struct bpf_trace_sample_data *sds; 6548e7a3920SDaniel Borkmann struct perf_raw_record raw = { 6558e7a3920SDaniel Borkmann .frag = { 6568e7a3920SDaniel Borkmann .size = size, 6578e7a3920SDaniel Borkmann .data = data, 6588e7a3920SDaniel Borkmann }, 6598e7a3920SDaniel Borkmann }; 6609594dc3cSMatt Mullins struct perf_sample_data *sd; 661f2c67a3eSJiri Olsa int nest_level, err; 662f2c67a3eSJiri Olsa 663f2c67a3eSJiri Olsa preempt_disable(); 664f2c67a3eSJiri Olsa sds = this_cpu_ptr(&bpf_trace_sds); 665f2c67a3eSJiri Olsa nest_level = this_cpu_inc_return(bpf_trace_nest_level); 6668e7a3920SDaniel Borkmann 6679594dc3cSMatt Mullins if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(sds->sds))) { 6689594dc3cSMatt Mullins err = -EBUSY; 6699594dc3cSMatt Mullins goto out; 6709594dc3cSMatt Mullins } 6719594dc3cSMatt Mullins 6729594dc3cSMatt Mullins sd = &sds->sds[nest_level - 1]; 6739594dc3cSMatt Mullins 6749594dc3cSMatt Mullins if (unlikely(flags & ~(BPF_F_INDEX_MASK))) { 6759594dc3cSMatt Mullins err = -EINVAL; 6769594dc3cSMatt Mullins goto out; 6779594dc3cSMatt Mullins } 6788e7a3920SDaniel Borkmann 679283ca526SDaniel Borkmann perf_sample_data_init(sd, 0, 0); 6800a9081cfSNamhyung Kim perf_sample_save_raw_data(sd, &raw); 681283ca526SDaniel Borkmann 6829594dc3cSMatt Mullins err = __bpf_perf_event_output(regs, map, flags, sd); 6839594dc3cSMatt Mullins out: 6849594dc3cSMatt Mullins this_cpu_dec(bpf_trace_nest_level); 685f2c67a3eSJiri Olsa preempt_enable(); 6869594dc3cSMatt Mullins return err; 6878e7a3920SDaniel Borkmann } 6888e7a3920SDaniel Borkmann 689a43eec30SAlexei Starovoitov static const struct bpf_func_proto bpf_perf_event_output_proto = { 690a43eec30SAlexei Starovoitov .func = bpf_perf_event_output, 6911075ef59SAlexei Starovoitov .gpl_only = true, 692a43eec30SAlexei Starovoitov .ret_type = RET_INTEGER, 693a43eec30SAlexei Starovoitov .arg1_type = ARG_PTR_TO_CTX, 694a43eec30SAlexei Starovoitov .arg2_type = ARG_CONST_MAP_PTR, 695a43eec30SAlexei Starovoitov .arg3_type = ARG_ANYTHING, 696216e3cd2SHao Luo .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 697a60dd35dSGianluca Borello .arg5_type = ARG_CONST_SIZE_OR_ZERO, 698a43eec30SAlexei Starovoitov }; 699a43eec30SAlexei Starovoitov 700768fb61fSAllan Zhang static DEFINE_PER_CPU(int, bpf_event_output_nest_level); 701768fb61fSAllan Zhang struct bpf_nested_pt_regs { 702768fb61fSAllan Zhang struct pt_regs regs[3]; 703768fb61fSAllan Zhang }; 704768fb61fSAllan Zhang static DEFINE_PER_CPU(struct bpf_nested_pt_regs, bpf_pt_regs); 705768fb61fSAllan Zhang static DEFINE_PER_CPU(struct bpf_trace_sample_data, bpf_misc_sds); 706bd570ff9SDaniel Borkmann 707555c8a86SDaniel Borkmann u64 bpf_event_output(struct bpf_map *map, u64 flags, void *meta, u64 meta_size, 708555c8a86SDaniel Borkmann void *ctx, u64 ctx_size, bpf_ctx_copy_t ctx_copy) 709bd570ff9SDaniel Borkmann { 710555c8a86SDaniel Borkmann struct perf_raw_frag frag = { 711555c8a86SDaniel Borkmann .copy = ctx_copy, 712555c8a86SDaniel Borkmann .size = ctx_size, 713555c8a86SDaniel Borkmann .data = ctx, 714555c8a86SDaniel Borkmann }; 715555c8a86SDaniel Borkmann struct perf_raw_record raw = { 716555c8a86SDaniel Borkmann .frag = { 717183fc153SAndrew Morton { 718555c8a86SDaniel Borkmann .next = ctx_size ? &frag : NULL, 719183fc153SAndrew Morton }, 720555c8a86SDaniel Borkmann .size = meta_size, 721555c8a86SDaniel Borkmann .data = meta, 722555c8a86SDaniel Borkmann }, 723555c8a86SDaniel Borkmann }; 724768fb61fSAllan Zhang struct perf_sample_data *sd; 725768fb61fSAllan Zhang struct pt_regs *regs; 726d62cc390SJiri Olsa int nest_level; 727768fb61fSAllan Zhang u64 ret; 728768fb61fSAllan Zhang 729d62cc390SJiri Olsa preempt_disable(); 730d62cc390SJiri Olsa nest_level = this_cpu_inc_return(bpf_event_output_nest_level); 731d62cc390SJiri Olsa 732768fb61fSAllan Zhang if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(bpf_misc_sds.sds))) { 733768fb61fSAllan Zhang ret = -EBUSY; 734768fb61fSAllan Zhang goto out; 735768fb61fSAllan Zhang } 736768fb61fSAllan Zhang sd = this_cpu_ptr(&bpf_misc_sds.sds[nest_level - 1]); 737768fb61fSAllan Zhang regs = this_cpu_ptr(&bpf_pt_regs.regs[nest_level - 1]); 738bd570ff9SDaniel Borkmann 739bd570ff9SDaniel Borkmann perf_fetch_caller_regs(regs); 740283ca526SDaniel Borkmann perf_sample_data_init(sd, 0, 0); 7410a9081cfSNamhyung Kim perf_sample_save_raw_data(sd, &raw); 742bd570ff9SDaniel Borkmann 743768fb61fSAllan Zhang ret = __bpf_perf_event_output(regs, map, flags, sd); 744768fb61fSAllan Zhang out: 745768fb61fSAllan Zhang this_cpu_dec(bpf_event_output_nest_level); 746d62cc390SJiri Olsa preempt_enable(); 747768fb61fSAllan Zhang return ret; 748bd570ff9SDaniel Borkmann } 749bd570ff9SDaniel Borkmann 750f3694e00SDaniel Borkmann BPF_CALL_0(bpf_get_current_task) 751606274c5SAlexei Starovoitov { 752606274c5SAlexei Starovoitov return (long) current; 753606274c5SAlexei Starovoitov } 754606274c5SAlexei Starovoitov 755f470378cSJohn Fastabend const struct bpf_func_proto bpf_get_current_task_proto = { 756606274c5SAlexei Starovoitov .func = bpf_get_current_task, 757606274c5SAlexei Starovoitov .gpl_only = true, 758606274c5SAlexei Starovoitov .ret_type = RET_INTEGER, 759606274c5SAlexei Starovoitov }; 760606274c5SAlexei Starovoitov 7613ca1032aSKP Singh BPF_CALL_0(bpf_get_current_task_btf) 7623ca1032aSKP Singh { 7633ca1032aSKP Singh return (unsigned long) current; 7643ca1032aSKP Singh } 7653ca1032aSKP Singh 766a396eda5SDaniel Xu const struct bpf_func_proto bpf_get_current_task_btf_proto = { 7673ca1032aSKP Singh .func = bpf_get_current_task_btf, 7683ca1032aSKP Singh .gpl_only = true, 7693f00c523SDavid Vernet .ret_type = RET_PTR_TO_BTF_ID_TRUSTED, 770d19ddb47SSong Liu .ret_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], 7713ca1032aSKP Singh }; 7723ca1032aSKP Singh 773dd6e10fbSDaniel Xu BPF_CALL_1(bpf_task_pt_regs, struct task_struct *, task) 774dd6e10fbSDaniel Xu { 775dd6e10fbSDaniel Xu return (unsigned long) task_pt_regs(task); 776dd6e10fbSDaniel Xu } 777dd6e10fbSDaniel Xu 778dd6e10fbSDaniel Xu BTF_ID_LIST(bpf_task_pt_regs_ids) 779dd6e10fbSDaniel Xu BTF_ID(struct, pt_regs) 780dd6e10fbSDaniel Xu 781dd6e10fbSDaniel Xu const struct bpf_func_proto bpf_task_pt_regs_proto = { 782dd6e10fbSDaniel Xu .func = bpf_task_pt_regs, 783dd6e10fbSDaniel Xu .gpl_only = true, 784dd6e10fbSDaniel Xu .arg1_type = ARG_PTR_TO_BTF_ID, 785d19ddb47SSong Liu .arg1_btf_id = &btf_tracing_ids[BTF_TRACING_TYPE_TASK], 786dd6e10fbSDaniel Xu .ret_type = RET_PTR_TO_BTF_ID, 787dd6e10fbSDaniel Xu .ret_btf_id = &bpf_task_pt_regs_ids[0], 788dd6e10fbSDaniel Xu }; 789dd6e10fbSDaniel Xu 790f3694e00SDaniel Borkmann BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx) 79160d20f91SSargun Dhillon { 79260d20f91SSargun Dhillon struct bpf_array *array = container_of(map, struct bpf_array, map); 79360d20f91SSargun Dhillon struct cgroup *cgrp; 79460d20f91SSargun Dhillon 79560d20f91SSargun Dhillon if (unlikely(idx >= array->map.max_entries)) 79660d20f91SSargun Dhillon return -E2BIG; 79760d20f91SSargun Dhillon 79860d20f91SSargun Dhillon cgrp = READ_ONCE(array->ptrs[idx]); 79960d20f91SSargun Dhillon if (unlikely(!cgrp)) 80060d20f91SSargun Dhillon return -EAGAIN; 80160d20f91SSargun Dhillon 80260d20f91SSargun Dhillon return task_under_cgroup_hierarchy(current, cgrp); 80360d20f91SSargun Dhillon } 80460d20f91SSargun Dhillon 80560d20f91SSargun Dhillon static const struct bpf_func_proto bpf_current_task_under_cgroup_proto = { 80660d20f91SSargun Dhillon .func = bpf_current_task_under_cgroup, 80760d20f91SSargun Dhillon .gpl_only = false, 80860d20f91SSargun Dhillon .ret_type = RET_INTEGER, 80960d20f91SSargun Dhillon .arg1_type = ARG_CONST_MAP_PTR, 81060d20f91SSargun Dhillon .arg2_type = ARG_ANYTHING, 81160d20f91SSargun Dhillon }; 81260d20f91SSargun Dhillon 8138b401f9eSYonghong Song struct send_signal_irq_work { 8148b401f9eSYonghong Song struct irq_work irq_work; 8158b401f9eSYonghong Song struct task_struct *task; 8168b401f9eSYonghong Song u32 sig; 8178482941fSYonghong Song enum pid_type type; 8188b401f9eSYonghong Song }; 8198b401f9eSYonghong Song 8208b401f9eSYonghong Song static DEFINE_PER_CPU(struct send_signal_irq_work, send_signal_work); 8218b401f9eSYonghong Song 8228b401f9eSYonghong Song static void do_bpf_send_signal(struct irq_work *entry) 8238b401f9eSYonghong Song { 8248b401f9eSYonghong Song struct send_signal_irq_work *work; 8258b401f9eSYonghong Song 8268b401f9eSYonghong Song work = container_of(entry, struct send_signal_irq_work, irq_work); 8278482941fSYonghong Song group_send_sig_info(work->sig, SEND_SIG_PRIV, work->task, work->type); 828bdb7fdb0SYonghong Song put_task_struct(work->task); 8298b401f9eSYonghong Song } 8308b401f9eSYonghong Song 8318482941fSYonghong Song static int bpf_send_signal_common(u32 sig, enum pid_type type) 8328b401f9eSYonghong Song { 8338b401f9eSYonghong Song struct send_signal_irq_work *work = NULL; 8348b401f9eSYonghong Song 8358b401f9eSYonghong Song /* Similar to bpf_probe_write_user, task needs to be 8368b401f9eSYonghong Song * in a sound condition and kernel memory access be 8378b401f9eSYonghong Song * permitted in order to send signal to the current 8388b401f9eSYonghong Song * task. 8398b401f9eSYonghong Song */ 8408b401f9eSYonghong Song if (unlikely(current->flags & (PF_KTHREAD | PF_EXITING))) 8418b401f9eSYonghong Song return -EPERM; 8428b401f9eSYonghong Song if (unlikely(!nmi_uaccess_okay())) 8438b401f9eSYonghong Song return -EPERM; 844a3d81bc1SHao Sun /* Task should not be pid=1 to avoid kernel panic. */ 845a3d81bc1SHao Sun if (unlikely(is_global_init(current))) 846a3d81bc1SHao Sun return -EPERM; 8478b401f9eSYonghong Song 8481bc7896eSYonghong Song if (irqs_disabled()) { 849e1afb702SYonghong Song /* Do an early check on signal validity. Otherwise, 850e1afb702SYonghong Song * the error is lost in deferred irq_work. 851e1afb702SYonghong Song */ 852e1afb702SYonghong Song if (unlikely(!valid_signal(sig))) 853e1afb702SYonghong Song return -EINVAL; 854e1afb702SYonghong Song 8558b401f9eSYonghong Song work = this_cpu_ptr(&send_signal_work); 8567a9f50a0SPeter Zijlstra if (irq_work_is_busy(&work->irq_work)) 8578b401f9eSYonghong Song return -EBUSY; 8588b401f9eSYonghong Song 8598b401f9eSYonghong Song /* Add the current task, which is the target of sending signal, 8608b401f9eSYonghong Song * to the irq_work. The current task may change when queued 8618b401f9eSYonghong Song * irq works get executed. 8628b401f9eSYonghong Song */ 863bdb7fdb0SYonghong Song work->task = get_task_struct(current); 8648b401f9eSYonghong Song work->sig = sig; 8658482941fSYonghong Song work->type = type; 8668b401f9eSYonghong Song irq_work_queue(&work->irq_work); 8678b401f9eSYonghong Song return 0; 8688b401f9eSYonghong Song } 8698b401f9eSYonghong Song 8708482941fSYonghong Song return group_send_sig_info(sig, SEND_SIG_PRIV, current, type); 8718482941fSYonghong Song } 8728482941fSYonghong Song 8738482941fSYonghong Song BPF_CALL_1(bpf_send_signal, u32, sig) 8748482941fSYonghong Song { 8758482941fSYonghong Song return bpf_send_signal_common(sig, PIDTYPE_TGID); 8768b401f9eSYonghong Song } 8778b401f9eSYonghong Song 8788b401f9eSYonghong Song static const struct bpf_func_proto bpf_send_signal_proto = { 8798b401f9eSYonghong Song .func = bpf_send_signal, 8808b401f9eSYonghong Song .gpl_only = false, 8818b401f9eSYonghong Song .ret_type = RET_INTEGER, 8828b401f9eSYonghong Song .arg1_type = ARG_ANYTHING, 8838b401f9eSYonghong Song }; 8848b401f9eSYonghong Song 8858482941fSYonghong Song BPF_CALL_1(bpf_send_signal_thread, u32, sig) 8868482941fSYonghong Song { 8878482941fSYonghong Song return bpf_send_signal_common(sig, PIDTYPE_PID); 8888482941fSYonghong Song } 8898482941fSYonghong Song 8908482941fSYonghong Song static const struct bpf_func_proto bpf_send_signal_thread_proto = { 8918482941fSYonghong Song .func = bpf_send_signal_thread, 8928482941fSYonghong Song .gpl_only = false, 8938482941fSYonghong Song .ret_type = RET_INTEGER, 8948482941fSYonghong Song .arg1_type = ARG_ANYTHING, 8958482941fSYonghong Song }; 8968482941fSYonghong Song 8976e22ab9dSJiri Olsa BPF_CALL_3(bpf_d_path, struct path *, path, char *, buf, u32, sz) 8986e22ab9dSJiri Olsa { 899f46fab0eSJiri Olsa struct path copy; 9006e22ab9dSJiri Olsa long len; 9016e22ab9dSJiri Olsa char *p; 9026e22ab9dSJiri Olsa 9036e22ab9dSJiri Olsa if (!sz) 9046e22ab9dSJiri Olsa return 0; 9056e22ab9dSJiri Olsa 906f46fab0eSJiri Olsa /* 907f46fab0eSJiri Olsa * The path pointer is verified as trusted and safe to use, 908f46fab0eSJiri Olsa * but let's double check it's valid anyway to workaround 909f46fab0eSJiri Olsa * potentially broken verifier. 910f46fab0eSJiri Olsa */ 911f46fab0eSJiri Olsa len = copy_from_kernel_nofault(©, path, sizeof(*path)); 912f46fab0eSJiri Olsa if (len < 0) 913f46fab0eSJiri Olsa return len; 914f46fab0eSJiri Olsa 915f46fab0eSJiri Olsa p = d_path(©, buf, sz); 9166e22ab9dSJiri Olsa if (IS_ERR(p)) { 9176e22ab9dSJiri Olsa len = PTR_ERR(p); 9186e22ab9dSJiri Olsa } else { 9196e22ab9dSJiri Olsa len = buf + sz - p; 9206e22ab9dSJiri Olsa memmove(buf, p, len); 9216e22ab9dSJiri Olsa } 9226e22ab9dSJiri Olsa 9236e22ab9dSJiri Olsa return len; 9246e22ab9dSJiri Olsa } 9256e22ab9dSJiri Olsa 9266e22ab9dSJiri Olsa BTF_SET_START(btf_allowlist_d_path) 927a8a71796SJiri Olsa #ifdef CONFIG_SECURITY 928a8a71796SJiri Olsa BTF_ID(func, security_file_permission) 929a8a71796SJiri Olsa BTF_ID(func, security_inode_getattr) 930a8a71796SJiri Olsa BTF_ID(func, security_file_open) 931a8a71796SJiri Olsa #endif 932a8a71796SJiri Olsa #ifdef CONFIG_SECURITY_PATH 933a8a71796SJiri Olsa BTF_ID(func, security_path_truncate) 934a8a71796SJiri Olsa #endif 9356e22ab9dSJiri Olsa BTF_ID(func, vfs_truncate) 9366e22ab9dSJiri Olsa BTF_ID(func, vfs_fallocate) 9376e22ab9dSJiri Olsa BTF_ID(func, dentry_open) 9386e22ab9dSJiri Olsa BTF_ID(func, vfs_getattr) 9396e22ab9dSJiri Olsa BTF_ID(func, filp_close) 9406e22ab9dSJiri Olsa BTF_SET_END(btf_allowlist_d_path) 9416e22ab9dSJiri Olsa 9426e22ab9dSJiri Olsa static bool bpf_d_path_allowed(const struct bpf_prog *prog) 9436e22ab9dSJiri Olsa { 9443d06f34aSSong Liu if (prog->type == BPF_PROG_TYPE_TRACING && 9453d06f34aSSong Liu prog->expected_attach_type == BPF_TRACE_ITER) 9463d06f34aSSong Liu return true; 9473d06f34aSSong Liu 9486f100640SKP Singh if (prog->type == BPF_PROG_TYPE_LSM) 9496f100640SKP Singh return bpf_lsm_is_sleepable_hook(prog->aux->attach_btf_id); 9506f100640SKP Singh 9516f100640SKP Singh return btf_id_set_contains(&btf_allowlist_d_path, 9526f100640SKP Singh prog->aux->attach_btf_id); 9536e22ab9dSJiri Olsa } 9546e22ab9dSJiri Olsa 9559436ef6eSLorenz Bauer BTF_ID_LIST_SINGLE(bpf_d_path_btf_ids, struct, path) 9566e22ab9dSJiri Olsa 9576e22ab9dSJiri Olsa static const struct bpf_func_proto bpf_d_path_proto = { 9586e22ab9dSJiri Olsa .func = bpf_d_path, 9596e22ab9dSJiri Olsa .gpl_only = false, 9606e22ab9dSJiri Olsa .ret_type = RET_INTEGER, 9616e22ab9dSJiri Olsa .arg1_type = ARG_PTR_TO_BTF_ID, 9629436ef6eSLorenz Bauer .arg1_btf_id = &bpf_d_path_btf_ids[0], 9636e22ab9dSJiri Olsa .arg2_type = ARG_PTR_TO_MEM, 9646e22ab9dSJiri Olsa .arg3_type = ARG_CONST_SIZE_OR_ZERO, 9656e22ab9dSJiri Olsa .allowed = bpf_d_path_allowed, 9666e22ab9dSJiri Olsa }; 9676e22ab9dSJiri Olsa 968c4d0bfb4SAlan Maguire #define BTF_F_ALL (BTF_F_COMPACT | BTF_F_NONAME | \ 969c4d0bfb4SAlan Maguire BTF_F_PTR_RAW | BTF_F_ZERO) 970c4d0bfb4SAlan Maguire 971c4d0bfb4SAlan Maguire static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size, 972c4d0bfb4SAlan Maguire u64 flags, const struct btf **btf, 973c4d0bfb4SAlan Maguire s32 *btf_id) 974c4d0bfb4SAlan Maguire { 975c4d0bfb4SAlan Maguire const struct btf_type *t; 976c4d0bfb4SAlan Maguire 977c4d0bfb4SAlan Maguire if (unlikely(flags & ~(BTF_F_ALL))) 978c4d0bfb4SAlan Maguire return -EINVAL; 979c4d0bfb4SAlan Maguire 980c4d0bfb4SAlan Maguire if (btf_ptr_size != sizeof(struct btf_ptr)) 981c4d0bfb4SAlan Maguire return -EINVAL; 982c4d0bfb4SAlan Maguire 983c4d0bfb4SAlan Maguire *btf = bpf_get_btf_vmlinux(); 984c4d0bfb4SAlan Maguire 985c4d0bfb4SAlan Maguire if (IS_ERR_OR_NULL(*btf)) 986abbaa433SWang Qing return IS_ERR(*btf) ? PTR_ERR(*btf) : -EINVAL; 987c4d0bfb4SAlan Maguire 988c4d0bfb4SAlan Maguire if (ptr->type_id > 0) 989c4d0bfb4SAlan Maguire *btf_id = ptr->type_id; 990c4d0bfb4SAlan Maguire else 991c4d0bfb4SAlan Maguire return -EINVAL; 992c4d0bfb4SAlan Maguire 993c4d0bfb4SAlan Maguire if (*btf_id > 0) 994c4d0bfb4SAlan Maguire t = btf_type_by_id(*btf, *btf_id); 995c4d0bfb4SAlan Maguire if (*btf_id <= 0 || !t) 996c4d0bfb4SAlan Maguire return -ENOENT; 997c4d0bfb4SAlan Maguire 998c4d0bfb4SAlan Maguire return 0; 999c4d0bfb4SAlan Maguire } 1000c4d0bfb4SAlan Maguire 1001c4d0bfb4SAlan Maguire BPF_CALL_5(bpf_snprintf_btf, char *, str, u32, str_size, struct btf_ptr *, ptr, 1002c4d0bfb4SAlan Maguire u32, btf_ptr_size, u64, flags) 1003c4d0bfb4SAlan Maguire { 1004c4d0bfb4SAlan Maguire const struct btf *btf; 1005c4d0bfb4SAlan Maguire s32 btf_id; 1006c4d0bfb4SAlan Maguire int ret; 1007c4d0bfb4SAlan Maguire 1008c4d0bfb4SAlan Maguire ret = bpf_btf_printf_prepare(ptr, btf_ptr_size, flags, &btf, &btf_id); 1009c4d0bfb4SAlan Maguire if (ret) 1010c4d0bfb4SAlan Maguire return ret; 1011c4d0bfb4SAlan Maguire 1012c4d0bfb4SAlan Maguire return btf_type_snprintf_show(btf, btf_id, ptr->ptr, str, str_size, 1013c4d0bfb4SAlan Maguire flags); 1014c4d0bfb4SAlan Maguire } 1015c4d0bfb4SAlan Maguire 1016c4d0bfb4SAlan Maguire const struct bpf_func_proto bpf_snprintf_btf_proto = { 1017c4d0bfb4SAlan Maguire .func = bpf_snprintf_btf, 1018c4d0bfb4SAlan Maguire .gpl_only = false, 1019c4d0bfb4SAlan Maguire .ret_type = RET_INTEGER, 1020c4d0bfb4SAlan Maguire .arg1_type = ARG_PTR_TO_MEM, 1021c4d0bfb4SAlan Maguire .arg2_type = ARG_CONST_SIZE, 1022216e3cd2SHao Luo .arg3_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1023c4d0bfb4SAlan Maguire .arg4_type = ARG_CONST_SIZE, 1024c4d0bfb4SAlan Maguire .arg5_type = ARG_ANYTHING, 1025c4d0bfb4SAlan Maguire }; 1026c4d0bfb4SAlan Maguire 10279b99edcaSJiri Olsa BPF_CALL_1(bpf_get_func_ip_tracing, void *, ctx) 10289b99edcaSJiri Olsa { 10299b99edcaSJiri Olsa /* This helper call is inlined by verifier. */ 1030f92c1e18SJiri Olsa return ((u64 *)ctx)[-2]; 10319b99edcaSJiri Olsa } 10329b99edcaSJiri Olsa 10339b99edcaSJiri Olsa static const struct bpf_func_proto bpf_get_func_ip_proto_tracing = { 10349b99edcaSJiri Olsa .func = bpf_get_func_ip_tracing, 10359b99edcaSJiri Olsa .gpl_only = true, 10369b99edcaSJiri Olsa .ret_type = RET_INTEGER, 10379b99edcaSJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 10389b99edcaSJiri Olsa }; 10399b99edcaSJiri Olsa 1040c09eb2e5SJiri Olsa #ifdef CONFIG_X86_KERNEL_IBT 1041c09eb2e5SJiri Olsa static unsigned long get_entry_ip(unsigned long fentry_ip) 1042c09eb2e5SJiri Olsa { 1043c09eb2e5SJiri Olsa u32 instr; 1044c09eb2e5SJiri Olsa 1045c09eb2e5SJiri Olsa /* Being extra safe in here in case entry ip is on the page-edge. */ 1046c09eb2e5SJiri Olsa if (get_kernel_nofault(instr, (u32 *) fentry_ip - 1)) 1047c09eb2e5SJiri Olsa return fentry_ip; 1048c09eb2e5SJiri Olsa if (is_endbr(instr)) 1049c09eb2e5SJiri Olsa fentry_ip -= ENDBR_INSN_SIZE; 1050c09eb2e5SJiri Olsa return fentry_ip; 1051c09eb2e5SJiri Olsa } 1052c09eb2e5SJiri Olsa #else 1053c09eb2e5SJiri Olsa #define get_entry_ip(fentry_ip) fentry_ip 1054c09eb2e5SJiri Olsa #endif 1055c09eb2e5SJiri Olsa 10569ffd9f3fSJiri Olsa BPF_CALL_1(bpf_get_func_ip_kprobe, struct pt_regs *, regs) 10579ffd9f3fSJiri Olsa { 1058*a3c485a5SJiri Olsa struct bpf_trace_run_ctx *run_ctx __maybe_unused; 1059*a3c485a5SJiri Olsa struct kprobe *kp; 1060*a3c485a5SJiri Olsa 1061*a3c485a5SJiri Olsa #ifdef CONFIG_UPROBES 1062*a3c485a5SJiri Olsa run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); 1063*a3c485a5SJiri Olsa if (run_ctx->is_uprobe) 1064*a3c485a5SJiri Olsa return ((struct uprobe_dispatch_data *)current->utask->vaddr)->bp_addr; 1065*a3c485a5SJiri Olsa #endif 1066*a3c485a5SJiri Olsa 1067*a3c485a5SJiri Olsa kp = kprobe_running(); 10689ffd9f3fSJiri Olsa 10690e253f7eSJiri Olsa if (!kp || !(kp->flags & KPROBE_FLAG_ON_FUNC_ENTRY)) 10700e253f7eSJiri Olsa return 0; 10710e253f7eSJiri Olsa 10720e253f7eSJiri Olsa return get_entry_ip((uintptr_t)kp->addr); 10739ffd9f3fSJiri Olsa } 10749ffd9f3fSJiri Olsa 10759ffd9f3fSJiri Olsa static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe = { 10769ffd9f3fSJiri Olsa .func = bpf_get_func_ip_kprobe, 10779ffd9f3fSJiri Olsa .gpl_only = true, 10789ffd9f3fSJiri Olsa .ret_type = RET_INTEGER, 10799ffd9f3fSJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 10809ffd9f3fSJiri Olsa }; 10819ffd9f3fSJiri Olsa 108242a57120SJiri Olsa BPF_CALL_1(bpf_get_func_ip_kprobe_multi, struct pt_regs *, regs) 108342a57120SJiri Olsa { 1084f7098690SJiri Olsa return bpf_kprobe_multi_entry_ip(current->bpf_ctx); 108542a57120SJiri Olsa } 108642a57120SJiri Olsa 108742a57120SJiri Olsa static const struct bpf_func_proto bpf_get_func_ip_proto_kprobe_multi = { 108842a57120SJiri Olsa .func = bpf_get_func_ip_kprobe_multi, 108942a57120SJiri Olsa .gpl_only = false, 109042a57120SJiri Olsa .ret_type = RET_INTEGER, 109142a57120SJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 109242a57120SJiri Olsa }; 109342a57120SJiri Olsa 1094ca74823cSJiri Olsa BPF_CALL_1(bpf_get_attach_cookie_kprobe_multi, struct pt_regs *, regs) 1095ca74823cSJiri Olsa { 1096f7098690SJiri Olsa return bpf_kprobe_multi_cookie(current->bpf_ctx); 1097ca74823cSJiri Olsa } 1098ca74823cSJiri Olsa 1099ca74823cSJiri Olsa static const struct bpf_func_proto bpf_get_attach_cookie_proto_kmulti = { 1100ca74823cSJiri Olsa .func = bpf_get_attach_cookie_kprobe_multi, 1101ca74823cSJiri Olsa .gpl_only = false, 1102ca74823cSJiri Olsa .ret_type = RET_INTEGER, 1103ca74823cSJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 1104ca74823cSJiri Olsa }; 1105ca74823cSJiri Olsa 11067adfc6c9SAndrii Nakryiko BPF_CALL_1(bpf_get_attach_cookie_trace, void *, ctx) 11077adfc6c9SAndrii Nakryiko { 11087adfc6c9SAndrii Nakryiko struct bpf_trace_run_ctx *run_ctx; 11097adfc6c9SAndrii Nakryiko 11107adfc6c9SAndrii Nakryiko run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); 11117adfc6c9SAndrii Nakryiko return run_ctx->bpf_cookie; 11127adfc6c9SAndrii Nakryiko } 11137adfc6c9SAndrii Nakryiko 11147adfc6c9SAndrii Nakryiko static const struct bpf_func_proto bpf_get_attach_cookie_proto_trace = { 11157adfc6c9SAndrii Nakryiko .func = bpf_get_attach_cookie_trace, 11167adfc6c9SAndrii Nakryiko .gpl_only = false, 11177adfc6c9SAndrii Nakryiko .ret_type = RET_INTEGER, 11187adfc6c9SAndrii Nakryiko .arg1_type = ARG_PTR_TO_CTX, 11197adfc6c9SAndrii Nakryiko }; 11207adfc6c9SAndrii Nakryiko 11217adfc6c9SAndrii Nakryiko BPF_CALL_1(bpf_get_attach_cookie_pe, struct bpf_perf_event_data_kern *, ctx) 11227adfc6c9SAndrii Nakryiko { 11237adfc6c9SAndrii Nakryiko return ctx->event->bpf_cookie; 11247adfc6c9SAndrii Nakryiko } 11257adfc6c9SAndrii Nakryiko 11267adfc6c9SAndrii Nakryiko static const struct bpf_func_proto bpf_get_attach_cookie_proto_pe = { 11277adfc6c9SAndrii Nakryiko .func = bpf_get_attach_cookie_pe, 11287adfc6c9SAndrii Nakryiko .gpl_only = false, 11297adfc6c9SAndrii Nakryiko .ret_type = RET_INTEGER, 11307adfc6c9SAndrii Nakryiko .arg1_type = ARG_PTR_TO_CTX, 11317adfc6c9SAndrii Nakryiko }; 11327adfc6c9SAndrii Nakryiko 11332fcc8241SKui-Feng Lee BPF_CALL_1(bpf_get_attach_cookie_tracing, void *, ctx) 11342fcc8241SKui-Feng Lee { 11352fcc8241SKui-Feng Lee struct bpf_trace_run_ctx *run_ctx; 11362fcc8241SKui-Feng Lee 11372fcc8241SKui-Feng Lee run_ctx = container_of(current->bpf_ctx, struct bpf_trace_run_ctx, run_ctx); 11382fcc8241SKui-Feng Lee return run_ctx->bpf_cookie; 11392fcc8241SKui-Feng Lee } 11402fcc8241SKui-Feng Lee 11412fcc8241SKui-Feng Lee static const struct bpf_func_proto bpf_get_attach_cookie_proto_tracing = { 11422fcc8241SKui-Feng Lee .func = bpf_get_attach_cookie_tracing, 11432fcc8241SKui-Feng Lee .gpl_only = false, 11442fcc8241SKui-Feng Lee .ret_type = RET_INTEGER, 11452fcc8241SKui-Feng Lee .arg1_type = ARG_PTR_TO_CTX, 11462fcc8241SKui-Feng Lee }; 11472fcc8241SKui-Feng Lee 1148856c02dbSSong Liu BPF_CALL_3(bpf_get_branch_snapshot, void *, buf, u32, size, u64, flags) 1149856c02dbSSong Liu { 1150856c02dbSSong Liu #ifndef CONFIG_X86 1151856c02dbSSong Liu return -ENOENT; 1152856c02dbSSong Liu #else 1153856c02dbSSong Liu static const u32 br_entry_size = sizeof(struct perf_branch_entry); 1154856c02dbSSong Liu u32 entry_cnt = size / br_entry_size; 1155856c02dbSSong Liu 1156856c02dbSSong Liu entry_cnt = static_call(perf_snapshot_branch_stack)(buf, entry_cnt); 1157856c02dbSSong Liu 1158856c02dbSSong Liu if (unlikely(flags)) 1159856c02dbSSong Liu return -EINVAL; 1160856c02dbSSong Liu 1161856c02dbSSong Liu if (!entry_cnt) 1162856c02dbSSong Liu return -ENOENT; 1163856c02dbSSong Liu 1164856c02dbSSong Liu return entry_cnt * br_entry_size; 1165856c02dbSSong Liu #endif 1166856c02dbSSong Liu } 1167856c02dbSSong Liu 1168856c02dbSSong Liu static const struct bpf_func_proto bpf_get_branch_snapshot_proto = { 1169856c02dbSSong Liu .func = bpf_get_branch_snapshot, 1170856c02dbSSong Liu .gpl_only = true, 1171856c02dbSSong Liu .ret_type = RET_INTEGER, 1172856c02dbSSong Liu .arg1_type = ARG_PTR_TO_UNINIT_MEM, 1173856c02dbSSong Liu .arg2_type = ARG_CONST_SIZE_OR_ZERO, 1174856c02dbSSong Liu }; 1175856c02dbSSong Liu 1176f92c1e18SJiri Olsa BPF_CALL_3(get_func_arg, void *, ctx, u32, n, u64 *, value) 1177f92c1e18SJiri Olsa { 1178f92c1e18SJiri Olsa /* This helper call is inlined by verifier. */ 1179f92c1e18SJiri Olsa u64 nr_args = ((u64 *)ctx)[-1]; 1180f92c1e18SJiri Olsa 1181f92c1e18SJiri Olsa if ((u64) n >= nr_args) 1182f92c1e18SJiri Olsa return -EINVAL; 1183f92c1e18SJiri Olsa *value = ((u64 *)ctx)[n]; 1184f92c1e18SJiri Olsa return 0; 1185f92c1e18SJiri Olsa } 1186f92c1e18SJiri Olsa 1187f92c1e18SJiri Olsa static const struct bpf_func_proto bpf_get_func_arg_proto = { 1188f92c1e18SJiri Olsa .func = get_func_arg, 1189f92c1e18SJiri Olsa .ret_type = RET_INTEGER, 1190f92c1e18SJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 1191f92c1e18SJiri Olsa .arg2_type = ARG_ANYTHING, 1192f92c1e18SJiri Olsa .arg3_type = ARG_PTR_TO_LONG, 1193f92c1e18SJiri Olsa }; 1194f92c1e18SJiri Olsa 1195f92c1e18SJiri Olsa BPF_CALL_2(get_func_ret, void *, ctx, u64 *, value) 1196f92c1e18SJiri Olsa { 1197f92c1e18SJiri Olsa /* This helper call is inlined by verifier. */ 1198f92c1e18SJiri Olsa u64 nr_args = ((u64 *)ctx)[-1]; 1199f92c1e18SJiri Olsa 1200f92c1e18SJiri Olsa *value = ((u64 *)ctx)[nr_args]; 1201f92c1e18SJiri Olsa return 0; 1202f92c1e18SJiri Olsa } 1203f92c1e18SJiri Olsa 1204f92c1e18SJiri Olsa static const struct bpf_func_proto bpf_get_func_ret_proto = { 1205f92c1e18SJiri Olsa .func = get_func_ret, 1206f92c1e18SJiri Olsa .ret_type = RET_INTEGER, 1207f92c1e18SJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 1208f92c1e18SJiri Olsa .arg2_type = ARG_PTR_TO_LONG, 1209f92c1e18SJiri Olsa }; 1210f92c1e18SJiri Olsa 1211f92c1e18SJiri Olsa BPF_CALL_1(get_func_arg_cnt, void *, ctx) 1212f92c1e18SJiri Olsa { 1213f92c1e18SJiri Olsa /* This helper call is inlined by verifier. */ 1214f92c1e18SJiri Olsa return ((u64 *)ctx)[-1]; 1215f92c1e18SJiri Olsa } 1216f92c1e18SJiri Olsa 1217f92c1e18SJiri Olsa static const struct bpf_func_proto bpf_get_func_arg_cnt_proto = { 1218f92c1e18SJiri Olsa .func = get_func_arg_cnt, 1219f92c1e18SJiri Olsa .ret_type = RET_INTEGER, 1220f92c1e18SJiri Olsa .arg1_type = ARG_PTR_TO_CTX, 1221f92c1e18SJiri Olsa }; 1222f92c1e18SJiri Olsa 1223f3cf4134SRoberto Sassu #ifdef CONFIG_KEYS 1224f3cf4134SRoberto Sassu __diag_push(); 1225f3cf4134SRoberto Sassu __diag_ignore_all("-Wmissing-prototypes", 1226f3cf4134SRoberto Sassu "kfuncs which will be used in BPF programs"); 1227f3cf4134SRoberto Sassu 1228f3cf4134SRoberto Sassu /** 1229f3cf4134SRoberto Sassu * bpf_lookup_user_key - lookup a key by its serial 1230f3cf4134SRoberto Sassu * @serial: key handle serial number 1231f3cf4134SRoberto Sassu * @flags: lookup-specific flags 1232f3cf4134SRoberto Sassu * 1233f3cf4134SRoberto Sassu * Search a key with a given *serial* and the provided *flags*. 1234f3cf4134SRoberto Sassu * If found, increment the reference count of the key by one, and 1235f3cf4134SRoberto Sassu * return it in the bpf_key structure. 1236f3cf4134SRoberto Sassu * 1237f3cf4134SRoberto Sassu * The bpf_key structure must be passed to bpf_key_put() when done 1238f3cf4134SRoberto Sassu * with it, so that the key reference count is decremented and the 1239f3cf4134SRoberto Sassu * bpf_key structure is freed. 1240f3cf4134SRoberto Sassu * 1241f3cf4134SRoberto Sassu * Permission checks are deferred to the time the key is used by 1242f3cf4134SRoberto Sassu * one of the available key-specific kfuncs. 1243f3cf4134SRoberto Sassu * 1244f3cf4134SRoberto Sassu * Set *flags* with KEY_LOOKUP_CREATE, to attempt creating a requested 1245f3cf4134SRoberto Sassu * special keyring (e.g. session keyring), if it doesn't yet exist. 1246f3cf4134SRoberto Sassu * Set *flags* with KEY_LOOKUP_PARTIAL, to lookup a key without waiting 1247f3cf4134SRoberto Sassu * for the key construction, and to retrieve uninstantiated keys (keys 1248f3cf4134SRoberto Sassu * without data attached to them). 1249f3cf4134SRoberto Sassu * 1250f3cf4134SRoberto Sassu * Return: a bpf_key pointer with a valid key pointer if the key is found, a 1251f3cf4134SRoberto Sassu * NULL pointer otherwise. 1252f3cf4134SRoberto Sassu */ 1253400031e0SDavid Vernet __bpf_kfunc struct bpf_key *bpf_lookup_user_key(u32 serial, u64 flags) 1254f3cf4134SRoberto Sassu { 1255f3cf4134SRoberto Sassu key_ref_t key_ref; 1256f3cf4134SRoberto Sassu struct bpf_key *bkey; 1257f3cf4134SRoberto Sassu 1258f3cf4134SRoberto Sassu if (flags & ~KEY_LOOKUP_ALL) 1259f3cf4134SRoberto Sassu return NULL; 1260f3cf4134SRoberto Sassu 1261f3cf4134SRoberto Sassu /* 1262f3cf4134SRoberto Sassu * Permission check is deferred until the key is used, as the 1263f3cf4134SRoberto Sassu * intent of the caller is unknown here. 1264f3cf4134SRoberto Sassu */ 1265f3cf4134SRoberto Sassu key_ref = lookup_user_key(serial, flags, KEY_DEFER_PERM_CHECK); 1266f3cf4134SRoberto Sassu if (IS_ERR(key_ref)) 1267f3cf4134SRoberto Sassu return NULL; 1268f3cf4134SRoberto Sassu 1269f3cf4134SRoberto Sassu bkey = kmalloc(sizeof(*bkey), GFP_KERNEL); 1270f3cf4134SRoberto Sassu if (!bkey) { 1271f3cf4134SRoberto Sassu key_put(key_ref_to_ptr(key_ref)); 1272f3cf4134SRoberto Sassu return NULL; 1273f3cf4134SRoberto Sassu } 1274f3cf4134SRoberto Sassu 1275f3cf4134SRoberto Sassu bkey->key = key_ref_to_ptr(key_ref); 1276f3cf4134SRoberto Sassu bkey->has_ref = true; 1277f3cf4134SRoberto Sassu 1278f3cf4134SRoberto Sassu return bkey; 1279f3cf4134SRoberto Sassu } 1280f3cf4134SRoberto Sassu 1281f3cf4134SRoberto Sassu /** 1282f3cf4134SRoberto Sassu * bpf_lookup_system_key - lookup a key by a system-defined ID 1283f3cf4134SRoberto Sassu * @id: key ID 1284f3cf4134SRoberto Sassu * 1285f3cf4134SRoberto Sassu * Obtain a bpf_key structure with a key pointer set to the passed key ID. 1286f3cf4134SRoberto Sassu * The key pointer is marked as invalid, to prevent bpf_key_put() from 1287f3cf4134SRoberto Sassu * attempting to decrement the key reference count on that pointer. The key 1288f3cf4134SRoberto Sassu * pointer set in such way is currently understood only by 1289f3cf4134SRoberto Sassu * verify_pkcs7_signature(). 1290f3cf4134SRoberto Sassu * 1291f3cf4134SRoberto Sassu * Set *id* to one of the values defined in include/linux/verification.h: 1292f3cf4134SRoberto Sassu * 0 for the primary keyring (immutable keyring of system keys); 1293f3cf4134SRoberto Sassu * VERIFY_USE_SECONDARY_KEYRING for both the primary and secondary keyring 1294f3cf4134SRoberto Sassu * (where keys can be added only if they are vouched for by existing keys 1295f3cf4134SRoberto Sassu * in those keyrings); VERIFY_USE_PLATFORM_KEYRING for the platform 1296f3cf4134SRoberto Sassu * keyring (primarily used by the integrity subsystem to verify a kexec'ed 1297f3cf4134SRoberto Sassu * kerned image and, possibly, the initramfs signature). 1298f3cf4134SRoberto Sassu * 1299f3cf4134SRoberto Sassu * Return: a bpf_key pointer with an invalid key pointer set from the 1300f3cf4134SRoberto Sassu * pre-determined ID on success, a NULL pointer otherwise 1301f3cf4134SRoberto Sassu */ 1302400031e0SDavid Vernet __bpf_kfunc struct bpf_key *bpf_lookup_system_key(u64 id) 1303f3cf4134SRoberto Sassu { 1304f3cf4134SRoberto Sassu struct bpf_key *bkey; 1305f3cf4134SRoberto Sassu 1306f3cf4134SRoberto Sassu if (system_keyring_id_check(id) < 0) 1307f3cf4134SRoberto Sassu return NULL; 1308f3cf4134SRoberto Sassu 1309f3cf4134SRoberto Sassu bkey = kmalloc(sizeof(*bkey), GFP_ATOMIC); 1310f3cf4134SRoberto Sassu if (!bkey) 1311f3cf4134SRoberto Sassu return NULL; 1312f3cf4134SRoberto Sassu 1313f3cf4134SRoberto Sassu bkey->key = (struct key *)(unsigned long)id; 1314f3cf4134SRoberto Sassu bkey->has_ref = false; 1315f3cf4134SRoberto Sassu 1316f3cf4134SRoberto Sassu return bkey; 1317f3cf4134SRoberto Sassu } 1318f3cf4134SRoberto Sassu 1319f3cf4134SRoberto Sassu /** 1320f3cf4134SRoberto Sassu * bpf_key_put - decrement key reference count if key is valid and free bpf_key 1321f3cf4134SRoberto Sassu * @bkey: bpf_key structure 1322f3cf4134SRoberto Sassu * 1323f3cf4134SRoberto Sassu * Decrement the reference count of the key inside *bkey*, if the pointer 1324f3cf4134SRoberto Sassu * is valid, and free *bkey*. 1325f3cf4134SRoberto Sassu */ 1326400031e0SDavid Vernet __bpf_kfunc void bpf_key_put(struct bpf_key *bkey) 1327f3cf4134SRoberto Sassu { 1328f3cf4134SRoberto Sassu if (bkey->has_ref) 1329f3cf4134SRoberto Sassu key_put(bkey->key); 1330f3cf4134SRoberto Sassu 1331f3cf4134SRoberto Sassu kfree(bkey); 1332f3cf4134SRoberto Sassu } 1333f3cf4134SRoberto Sassu 1334865b0566SRoberto Sassu #ifdef CONFIG_SYSTEM_DATA_VERIFICATION 1335865b0566SRoberto Sassu /** 1336865b0566SRoberto Sassu * bpf_verify_pkcs7_signature - verify a PKCS#7 signature 1337865b0566SRoberto Sassu * @data_ptr: data to verify 1338865b0566SRoberto Sassu * @sig_ptr: signature of the data 1339865b0566SRoberto Sassu * @trusted_keyring: keyring with keys trusted for signature verification 1340865b0566SRoberto Sassu * 1341865b0566SRoberto Sassu * Verify the PKCS#7 signature *sig_ptr* against the supplied *data_ptr* 1342865b0566SRoberto Sassu * with keys in a keyring referenced by *trusted_keyring*. 1343865b0566SRoberto Sassu * 1344865b0566SRoberto Sassu * Return: 0 on success, a negative value on error. 1345865b0566SRoberto Sassu */ 1346400031e0SDavid Vernet __bpf_kfunc int bpf_verify_pkcs7_signature(struct bpf_dynptr_kern *data_ptr, 1347865b0566SRoberto Sassu struct bpf_dynptr_kern *sig_ptr, 1348865b0566SRoberto Sassu struct bpf_key *trusted_keyring) 1349865b0566SRoberto Sassu { 1350865b0566SRoberto Sassu int ret; 1351865b0566SRoberto Sassu 1352865b0566SRoberto Sassu if (trusted_keyring->has_ref) { 1353865b0566SRoberto Sassu /* 1354865b0566SRoberto Sassu * Do the permission check deferred in bpf_lookup_user_key(). 1355865b0566SRoberto Sassu * See bpf_lookup_user_key() for more details. 1356865b0566SRoberto Sassu * 1357865b0566SRoberto Sassu * A call to key_task_permission() here would be redundant, as 1358865b0566SRoberto Sassu * it is already done by keyring_search() called by 1359865b0566SRoberto Sassu * find_asymmetric_key(). 1360865b0566SRoberto Sassu */ 1361865b0566SRoberto Sassu ret = key_validate(trusted_keyring->key); 1362865b0566SRoberto Sassu if (ret < 0) 1363865b0566SRoberto Sassu return ret; 1364865b0566SRoberto Sassu } 1365865b0566SRoberto Sassu 1366865b0566SRoberto Sassu return verify_pkcs7_signature(data_ptr->data, 136726662d73SJoanne Koong __bpf_dynptr_size(data_ptr), 1368865b0566SRoberto Sassu sig_ptr->data, 136926662d73SJoanne Koong __bpf_dynptr_size(sig_ptr), 1370865b0566SRoberto Sassu trusted_keyring->key, 1371865b0566SRoberto Sassu VERIFYING_UNSPECIFIED_SIGNATURE, NULL, 1372865b0566SRoberto Sassu NULL); 1373865b0566SRoberto Sassu } 1374865b0566SRoberto Sassu #endif /* CONFIG_SYSTEM_DATA_VERIFICATION */ 1375865b0566SRoberto Sassu 1376f3cf4134SRoberto Sassu __diag_pop(); 1377f3cf4134SRoberto Sassu 1378f3cf4134SRoberto Sassu BTF_SET8_START(key_sig_kfunc_set) 1379f3cf4134SRoberto Sassu BTF_ID_FLAGS(func, bpf_lookup_user_key, KF_ACQUIRE | KF_RET_NULL | KF_SLEEPABLE) 1380f3cf4134SRoberto Sassu BTF_ID_FLAGS(func, bpf_lookup_system_key, KF_ACQUIRE | KF_RET_NULL) 1381f3cf4134SRoberto Sassu BTF_ID_FLAGS(func, bpf_key_put, KF_RELEASE) 1382865b0566SRoberto Sassu #ifdef CONFIG_SYSTEM_DATA_VERIFICATION 1383865b0566SRoberto Sassu BTF_ID_FLAGS(func, bpf_verify_pkcs7_signature, KF_SLEEPABLE) 1384865b0566SRoberto Sassu #endif 1385f3cf4134SRoberto Sassu BTF_SET8_END(key_sig_kfunc_set) 1386f3cf4134SRoberto Sassu 1387f3cf4134SRoberto Sassu static const struct btf_kfunc_id_set bpf_key_sig_kfunc_set = { 1388f3cf4134SRoberto Sassu .owner = THIS_MODULE, 1389f3cf4134SRoberto Sassu .set = &key_sig_kfunc_set, 1390f3cf4134SRoberto Sassu }; 1391f3cf4134SRoberto Sassu 1392f3cf4134SRoberto Sassu static int __init bpf_key_sig_kfuncs_init(void) 1393f3cf4134SRoberto Sassu { 1394f3cf4134SRoberto Sassu return register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, 1395f3cf4134SRoberto Sassu &bpf_key_sig_kfunc_set); 1396f3cf4134SRoberto Sassu } 1397f3cf4134SRoberto Sassu 1398f3cf4134SRoberto Sassu late_initcall(bpf_key_sig_kfuncs_init); 1399f3cf4134SRoberto Sassu #endif /* CONFIG_KEYS */ 1400f3cf4134SRoberto Sassu 14017adfc6c9SAndrii Nakryiko static const struct bpf_func_proto * 1402fc611f47SKP Singh bpf_tracing_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 14032541517cSAlexei Starovoitov { 14042541517cSAlexei Starovoitov switch (func_id) { 14052541517cSAlexei Starovoitov case BPF_FUNC_map_lookup_elem: 14062541517cSAlexei Starovoitov return &bpf_map_lookup_elem_proto; 14072541517cSAlexei Starovoitov case BPF_FUNC_map_update_elem: 14082541517cSAlexei Starovoitov return &bpf_map_update_elem_proto; 14092541517cSAlexei Starovoitov case BPF_FUNC_map_delete_elem: 14102541517cSAlexei Starovoitov return &bpf_map_delete_elem_proto; 141102a8c817SAlban Crequy case BPF_FUNC_map_push_elem: 141202a8c817SAlban Crequy return &bpf_map_push_elem_proto; 141302a8c817SAlban Crequy case BPF_FUNC_map_pop_elem: 141402a8c817SAlban Crequy return &bpf_map_pop_elem_proto; 141502a8c817SAlban Crequy case BPF_FUNC_map_peek_elem: 141602a8c817SAlban Crequy return &bpf_map_peek_elem_proto; 141707343110SFeng Zhou case BPF_FUNC_map_lookup_percpu_elem: 141807343110SFeng Zhou return &bpf_map_lookup_percpu_elem_proto; 1419d9847d31SAlexei Starovoitov case BPF_FUNC_ktime_get_ns: 1420d9847d31SAlexei Starovoitov return &bpf_ktime_get_ns_proto; 142171d19214SMaciej Żenczykowski case BPF_FUNC_ktime_get_boot_ns: 142271d19214SMaciej Żenczykowski return &bpf_ktime_get_boot_ns_proto; 142304fd61abSAlexei Starovoitov case BPF_FUNC_tail_call: 142404fd61abSAlexei Starovoitov return &bpf_tail_call_proto; 1425ffeedafbSAlexei Starovoitov case BPF_FUNC_get_current_pid_tgid: 1426ffeedafbSAlexei Starovoitov return &bpf_get_current_pid_tgid_proto; 1427606274c5SAlexei Starovoitov case BPF_FUNC_get_current_task: 1428606274c5SAlexei Starovoitov return &bpf_get_current_task_proto; 14293ca1032aSKP Singh case BPF_FUNC_get_current_task_btf: 14303ca1032aSKP Singh return &bpf_get_current_task_btf_proto; 1431dd6e10fbSDaniel Xu case BPF_FUNC_task_pt_regs: 1432dd6e10fbSDaniel Xu return &bpf_task_pt_regs_proto; 1433ffeedafbSAlexei Starovoitov case BPF_FUNC_get_current_uid_gid: 1434ffeedafbSAlexei Starovoitov return &bpf_get_current_uid_gid_proto; 1435ffeedafbSAlexei Starovoitov case BPF_FUNC_get_current_comm: 1436ffeedafbSAlexei Starovoitov return &bpf_get_current_comm_proto; 14379c959c86SAlexei Starovoitov case BPF_FUNC_trace_printk: 14380756ea3eSAlexei Starovoitov return bpf_get_trace_printk_proto(); 1439ab1973d3SAlexei Starovoitov case BPF_FUNC_get_smp_processor_id: 1440ab1973d3SAlexei Starovoitov return &bpf_get_smp_processor_id_proto; 14412d0e30c3SDaniel Borkmann case BPF_FUNC_get_numa_node_id: 14422d0e30c3SDaniel Borkmann return &bpf_get_numa_node_id_proto; 144335578d79SKaixu Xia case BPF_FUNC_perf_event_read: 144435578d79SKaixu Xia return &bpf_perf_event_read_proto; 144560d20f91SSargun Dhillon case BPF_FUNC_current_task_under_cgroup: 144660d20f91SSargun Dhillon return &bpf_current_task_under_cgroup_proto; 14478937bd80SAlexei Starovoitov case BPF_FUNC_get_prandom_u32: 14488937bd80SAlexei Starovoitov return &bpf_get_prandom_u32_proto; 144951e1bb9eSDaniel Borkmann case BPF_FUNC_probe_write_user: 145051e1bb9eSDaniel Borkmann return security_locked_down(LOCKDOWN_BPF_WRITE_USER) < 0 ? 145151e1bb9eSDaniel Borkmann NULL : bpf_get_probe_write_proto(); 14526ae08ae3SDaniel Borkmann case BPF_FUNC_probe_read_user: 14536ae08ae3SDaniel Borkmann return &bpf_probe_read_user_proto; 14546ae08ae3SDaniel Borkmann case BPF_FUNC_probe_read_kernel: 145571330842SDaniel Borkmann return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? 1456ff40e510SDaniel Borkmann NULL : &bpf_probe_read_kernel_proto; 14576ae08ae3SDaniel Borkmann case BPF_FUNC_probe_read_user_str: 14586ae08ae3SDaniel Borkmann return &bpf_probe_read_user_str_proto; 14596ae08ae3SDaniel Borkmann case BPF_FUNC_probe_read_kernel_str: 146071330842SDaniel Borkmann return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? 1461ff40e510SDaniel Borkmann NULL : &bpf_probe_read_kernel_str_proto; 14620ebeea8cSDaniel Borkmann #ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE 14630ebeea8cSDaniel Borkmann case BPF_FUNC_probe_read: 146471330842SDaniel Borkmann return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? 1465ff40e510SDaniel Borkmann NULL : &bpf_probe_read_compat_proto; 1466a5e8c070SGianluca Borello case BPF_FUNC_probe_read_str: 146771330842SDaniel Borkmann return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ? 1468ff40e510SDaniel Borkmann NULL : &bpf_probe_read_compat_str_proto; 14690ebeea8cSDaniel Borkmann #endif 147034ea38caSYonghong Song #ifdef CONFIG_CGROUPS 1471c4bcfb38SYonghong Song case BPF_FUNC_cgrp_storage_get: 1472c4bcfb38SYonghong Song return &bpf_cgrp_storage_get_proto; 1473c4bcfb38SYonghong Song case BPF_FUNC_cgrp_storage_delete: 1474c4bcfb38SYonghong Song return &bpf_cgrp_storage_delete_proto; 147534ea38caSYonghong Song #endif 14768b401f9eSYonghong Song case BPF_FUNC_send_signal: 14778b401f9eSYonghong Song return &bpf_send_signal_proto; 14788482941fSYonghong Song case BPF_FUNC_send_signal_thread: 14798482941fSYonghong Song return &bpf_send_signal_thread_proto; 1480b80b033bSSong Liu case BPF_FUNC_perf_event_read_value: 1481b80b033bSSong Liu return &bpf_perf_event_read_value_proto; 1482b4490c5cSCarlos Neira case BPF_FUNC_get_ns_current_pid_tgid: 1483b4490c5cSCarlos Neira return &bpf_get_ns_current_pid_tgid_proto; 1484457f4436SAndrii Nakryiko case BPF_FUNC_ringbuf_output: 1485457f4436SAndrii Nakryiko return &bpf_ringbuf_output_proto; 1486457f4436SAndrii Nakryiko case BPF_FUNC_ringbuf_reserve: 1487457f4436SAndrii Nakryiko return &bpf_ringbuf_reserve_proto; 1488457f4436SAndrii Nakryiko case BPF_FUNC_ringbuf_submit: 1489457f4436SAndrii Nakryiko return &bpf_ringbuf_submit_proto; 1490457f4436SAndrii Nakryiko case BPF_FUNC_ringbuf_discard: 1491457f4436SAndrii Nakryiko return &bpf_ringbuf_discard_proto; 1492457f4436SAndrii Nakryiko case BPF_FUNC_ringbuf_query: 1493457f4436SAndrii Nakryiko return &bpf_ringbuf_query_proto; 149472e2b2b6SYonghong Song case BPF_FUNC_jiffies64: 149572e2b2b6SYonghong Song return &bpf_jiffies64_proto; 1496fa28dcb8SSong Liu case BPF_FUNC_get_task_stack: 1497fa28dcb8SSong Liu return &bpf_get_task_stack_proto; 149807be4c4aSAlexei Starovoitov case BPF_FUNC_copy_from_user: 149901685c5bSYonghong Song return &bpf_copy_from_user_proto; 1500376040e4SKenny Yu case BPF_FUNC_copy_from_user_task: 150101685c5bSYonghong Song return &bpf_copy_from_user_task_proto; 1502c4d0bfb4SAlan Maguire case BPF_FUNC_snprintf_btf: 1503c4d0bfb4SAlan Maguire return &bpf_snprintf_btf_proto; 1504b7906b70SAndrii Nakryiko case BPF_FUNC_per_cpu_ptr: 1505eaa6bcb7SHao Luo return &bpf_per_cpu_ptr_proto; 1506b7906b70SAndrii Nakryiko case BPF_FUNC_this_cpu_ptr: 150763d9b80dSHao Luo return &bpf_this_cpu_ptr_proto; 1508a10787e6SSong Liu case BPF_FUNC_task_storage_get: 15094279adb0SMartin KaFai Lau if (bpf_prog_check_recur(prog)) 15100593dd34SMartin KaFai Lau return &bpf_task_storage_get_recur_proto; 1511a10787e6SSong Liu return &bpf_task_storage_get_proto; 1512a10787e6SSong Liu case BPF_FUNC_task_storage_delete: 15138a7dac37SMartin KaFai Lau if (bpf_prog_check_recur(prog)) 15140593dd34SMartin KaFai Lau return &bpf_task_storage_delete_recur_proto; 1515a10787e6SSong Liu return &bpf_task_storage_delete_proto; 151669c087baSYonghong Song case BPF_FUNC_for_each_map_elem: 151769c087baSYonghong Song return &bpf_for_each_map_elem_proto; 15187b15523aSFlorent Revest case BPF_FUNC_snprintf: 15197b15523aSFlorent Revest return &bpf_snprintf_proto; 15209b99edcaSJiri Olsa case BPF_FUNC_get_func_ip: 15219b99edcaSJiri Olsa return &bpf_get_func_ip_proto_tracing; 1522856c02dbSSong Liu case BPF_FUNC_get_branch_snapshot: 1523856c02dbSSong Liu return &bpf_get_branch_snapshot_proto; 15247c7e3d31SSong Liu case BPF_FUNC_find_vma: 15257c7e3d31SSong Liu return &bpf_find_vma_proto; 152610aceb62SDave Marchevsky case BPF_FUNC_trace_vprintk: 152710aceb62SDave Marchevsky return bpf_get_trace_vprintk_proto(); 15289fd82b61SAlexei Starovoitov default: 1529b00628b1SAlexei Starovoitov return bpf_base_func_proto(func_id); 15309fd82b61SAlexei Starovoitov } 15319fd82b61SAlexei Starovoitov } 15329fd82b61SAlexei Starovoitov 15335e43f899SAndrey Ignatov static const struct bpf_func_proto * 15345e43f899SAndrey Ignatov kprobe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 15359fd82b61SAlexei Starovoitov { 15369fd82b61SAlexei Starovoitov switch (func_id) { 1537a43eec30SAlexei Starovoitov case BPF_FUNC_perf_event_output: 1538a43eec30SAlexei Starovoitov return &bpf_perf_event_output_proto; 1539d5a3b1f6SAlexei Starovoitov case BPF_FUNC_get_stackid: 1540d5a3b1f6SAlexei Starovoitov return &bpf_get_stackid_proto; 1541c195651eSYonghong Song case BPF_FUNC_get_stack: 1542c195651eSYonghong Song return &bpf_get_stack_proto; 15439802d865SJosef Bacik #ifdef CONFIG_BPF_KPROBE_OVERRIDE 15449802d865SJosef Bacik case BPF_FUNC_override_return: 15459802d865SJosef Bacik return &bpf_override_return_proto; 15469802d865SJosef Bacik #endif 15479ffd9f3fSJiri Olsa case BPF_FUNC_get_func_ip: 154842a57120SJiri Olsa return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI ? 154942a57120SJiri Olsa &bpf_get_func_ip_proto_kprobe_multi : 155042a57120SJiri Olsa &bpf_get_func_ip_proto_kprobe; 15517adfc6c9SAndrii Nakryiko case BPF_FUNC_get_attach_cookie: 1552ca74823cSJiri Olsa return prog->expected_attach_type == BPF_TRACE_KPROBE_MULTI ? 1553ca74823cSJiri Olsa &bpf_get_attach_cookie_proto_kmulti : 1554ca74823cSJiri Olsa &bpf_get_attach_cookie_proto_trace; 15552541517cSAlexei Starovoitov default: 1556fc611f47SKP Singh return bpf_tracing_func_proto(func_id, prog); 15572541517cSAlexei Starovoitov } 15582541517cSAlexei Starovoitov } 15592541517cSAlexei Starovoitov 15602541517cSAlexei Starovoitov /* bpf+kprobe programs can access fields of 'struct pt_regs' */ 156119de99f7SAlexei Starovoitov static bool kprobe_prog_is_valid_access(int off, int size, enum bpf_access_type type, 15625e43f899SAndrey Ignatov const struct bpf_prog *prog, 156323994631SYonghong Song struct bpf_insn_access_aux *info) 15642541517cSAlexei Starovoitov { 15652541517cSAlexei Starovoitov if (off < 0 || off >= sizeof(struct pt_regs)) 15662541517cSAlexei Starovoitov return false; 15672541517cSAlexei Starovoitov if (type != BPF_READ) 15682541517cSAlexei Starovoitov return false; 15692541517cSAlexei Starovoitov if (off % size != 0) 15702541517cSAlexei Starovoitov return false; 15712d071c64SDaniel Borkmann /* 15722d071c64SDaniel Borkmann * Assertion for 32 bit to make sure last 8 byte access 15732d071c64SDaniel Borkmann * (BPF_DW) to the last 4 byte member is disallowed. 15742d071c64SDaniel Borkmann */ 15752d071c64SDaniel Borkmann if (off + size > sizeof(struct pt_regs)) 15762d071c64SDaniel Borkmann return false; 15772d071c64SDaniel Borkmann 15782541517cSAlexei Starovoitov return true; 15792541517cSAlexei Starovoitov } 15802541517cSAlexei Starovoitov 15817de16e3aSJakub Kicinski const struct bpf_verifier_ops kprobe_verifier_ops = { 15822541517cSAlexei Starovoitov .get_func_proto = kprobe_prog_func_proto, 15832541517cSAlexei Starovoitov .is_valid_access = kprobe_prog_is_valid_access, 15842541517cSAlexei Starovoitov }; 15852541517cSAlexei Starovoitov 15867de16e3aSJakub Kicinski const struct bpf_prog_ops kprobe_prog_ops = { 15877de16e3aSJakub Kicinski }; 15887de16e3aSJakub Kicinski 1589f3694e00SDaniel Borkmann BPF_CALL_5(bpf_perf_event_output_tp, void *, tp_buff, struct bpf_map *, map, 1590f3694e00SDaniel Borkmann u64, flags, void *, data, u64, size) 15919940d67cSAlexei Starovoitov { 1592f3694e00SDaniel Borkmann struct pt_regs *regs = *(struct pt_regs **)tp_buff; 1593f3694e00SDaniel Borkmann 15949940d67cSAlexei Starovoitov /* 15959940d67cSAlexei Starovoitov * r1 points to perf tracepoint buffer where first 8 bytes are hidden 15969940d67cSAlexei Starovoitov * from bpf program and contain a pointer to 'struct pt_regs'. Fetch it 1597f3694e00SDaniel Borkmann * from there and call the same bpf_perf_event_output() helper inline. 15989940d67cSAlexei Starovoitov */ 1599f3694e00SDaniel Borkmann return ____bpf_perf_event_output(regs, map, flags, data, size); 16009940d67cSAlexei Starovoitov } 16019940d67cSAlexei Starovoitov 16029940d67cSAlexei Starovoitov static const struct bpf_func_proto bpf_perf_event_output_proto_tp = { 16039940d67cSAlexei Starovoitov .func = bpf_perf_event_output_tp, 16049940d67cSAlexei Starovoitov .gpl_only = true, 16059940d67cSAlexei Starovoitov .ret_type = RET_INTEGER, 16069940d67cSAlexei Starovoitov .arg1_type = ARG_PTR_TO_CTX, 16079940d67cSAlexei Starovoitov .arg2_type = ARG_CONST_MAP_PTR, 16089940d67cSAlexei Starovoitov .arg3_type = ARG_ANYTHING, 1609216e3cd2SHao Luo .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1610a60dd35dSGianluca Borello .arg5_type = ARG_CONST_SIZE_OR_ZERO, 16119940d67cSAlexei Starovoitov }; 16129940d67cSAlexei Starovoitov 1613f3694e00SDaniel Borkmann BPF_CALL_3(bpf_get_stackid_tp, void *, tp_buff, struct bpf_map *, map, 1614f3694e00SDaniel Borkmann u64, flags) 16159940d67cSAlexei Starovoitov { 1616f3694e00SDaniel Borkmann struct pt_regs *regs = *(struct pt_regs **)tp_buff; 16179940d67cSAlexei Starovoitov 1618f3694e00SDaniel Borkmann /* 1619f3694e00SDaniel Borkmann * Same comment as in bpf_perf_event_output_tp(), only that this time 1620f3694e00SDaniel Borkmann * the other helper's function body cannot be inlined due to being 1621f3694e00SDaniel Borkmann * external, thus we need to call raw helper function. 1622f3694e00SDaniel Borkmann */ 1623f3694e00SDaniel Borkmann return bpf_get_stackid((unsigned long) regs, (unsigned long) map, 1624f3694e00SDaniel Borkmann flags, 0, 0); 16259940d67cSAlexei Starovoitov } 16269940d67cSAlexei Starovoitov 16279940d67cSAlexei Starovoitov static const struct bpf_func_proto bpf_get_stackid_proto_tp = { 16289940d67cSAlexei Starovoitov .func = bpf_get_stackid_tp, 16299940d67cSAlexei Starovoitov .gpl_only = true, 16309940d67cSAlexei Starovoitov .ret_type = RET_INTEGER, 16319940d67cSAlexei Starovoitov .arg1_type = ARG_PTR_TO_CTX, 16329940d67cSAlexei Starovoitov .arg2_type = ARG_CONST_MAP_PTR, 16339940d67cSAlexei Starovoitov .arg3_type = ARG_ANYTHING, 16349940d67cSAlexei Starovoitov }; 16359940d67cSAlexei Starovoitov 1636c195651eSYonghong Song BPF_CALL_4(bpf_get_stack_tp, void *, tp_buff, void *, buf, u32, size, 1637c195651eSYonghong Song u64, flags) 1638c195651eSYonghong Song { 1639c195651eSYonghong Song struct pt_regs *regs = *(struct pt_regs **)tp_buff; 1640c195651eSYonghong Song 1641c195651eSYonghong Song return bpf_get_stack((unsigned long) regs, (unsigned long) buf, 1642c195651eSYonghong Song (unsigned long) size, flags, 0); 1643c195651eSYonghong Song } 1644c195651eSYonghong Song 1645c195651eSYonghong Song static const struct bpf_func_proto bpf_get_stack_proto_tp = { 1646c195651eSYonghong Song .func = bpf_get_stack_tp, 1647c195651eSYonghong Song .gpl_only = true, 1648c195651eSYonghong Song .ret_type = RET_INTEGER, 1649c195651eSYonghong Song .arg1_type = ARG_PTR_TO_CTX, 1650c195651eSYonghong Song .arg2_type = ARG_PTR_TO_UNINIT_MEM, 1651c195651eSYonghong Song .arg3_type = ARG_CONST_SIZE_OR_ZERO, 1652c195651eSYonghong Song .arg4_type = ARG_ANYTHING, 1653c195651eSYonghong Song }; 1654c195651eSYonghong Song 16555e43f899SAndrey Ignatov static const struct bpf_func_proto * 16565e43f899SAndrey Ignatov tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 16579fd82b61SAlexei Starovoitov { 16589fd82b61SAlexei Starovoitov switch (func_id) { 16599fd82b61SAlexei Starovoitov case BPF_FUNC_perf_event_output: 16609940d67cSAlexei Starovoitov return &bpf_perf_event_output_proto_tp; 16619fd82b61SAlexei Starovoitov case BPF_FUNC_get_stackid: 16629940d67cSAlexei Starovoitov return &bpf_get_stackid_proto_tp; 1663c195651eSYonghong Song case BPF_FUNC_get_stack: 1664c195651eSYonghong Song return &bpf_get_stack_proto_tp; 16657adfc6c9SAndrii Nakryiko case BPF_FUNC_get_attach_cookie: 16667adfc6c9SAndrii Nakryiko return &bpf_get_attach_cookie_proto_trace; 16679fd82b61SAlexei Starovoitov default: 1668fc611f47SKP Singh return bpf_tracing_func_proto(func_id, prog); 16699fd82b61SAlexei Starovoitov } 16709fd82b61SAlexei Starovoitov } 16719fd82b61SAlexei Starovoitov 167219de99f7SAlexei Starovoitov static bool tp_prog_is_valid_access(int off, int size, enum bpf_access_type type, 16735e43f899SAndrey Ignatov const struct bpf_prog *prog, 167423994631SYonghong Song struct bpf_insn_access_aux *info) 16759fd82b61SAlexei Starovoitov { 16769fd82b61SAlexei Starovoitov if (off < sizeof(void *) || off >= PERF_MAX_TRACE_SIZE) 16779fd82b61SAlexei Starovoitov return false; 16789fd82b61SAlexei Starovoitov if (type != BPF_READ) 16799fd82b61SAlexei Starovoitov return false; 16809fd82b61SAlexei Starovoitov if (off % size != 0) 16819fd82b61SAlexei Starovoitov return false; 16822d071c64SDaniel Borkmann 16832d071c64SDaniel Borkmann BUILD_BUG_ON(PERF_MAX_TRACE_SIZE % sizeof(__u64)); 16849fd82b61SAlexei Starovoitov return true; 16859fd82b61SAlexei Starovoitov } 16869fd82b61SAlexei Starovoitov 16877de16e3aSJakub Kicinski const struct bpf_verifier_ops tracepoint_verifier_ops = { 16889fd82b61SAlexei Starovoitov .get_func_proto = tp_prog_func_proto, 16899fd82b61SAlexei Starovoitov .is_valid_access = tp_prog_is_valid_access, 16909fd82b61SAlexei Starovoitov }; 16919fd82b61SAlexei Starovoitov 16927de16e3aSJakub Kicinski const struct bpf_prog_ops tracepoint_prog_ops = { 16937de16e3aSJakub Kicinski }; 16947de16e3aSJakub Kicinski 1695f005afedSYonghong Song BPF_CALL_3(bpf_perf_prog_read_value, struct bpf_perf_event_data_kern *, ctx, 1696f005afedSYonghong Song struct bpf_perf_event_value *, buf, u32, size) 1697f005afedSYonghong Song { 1698f005afedSYonghong Song int err = -EINVAL; 1699f005afedSYonghong Song 1700f005afedSYonghong Song if (unlikely(size != sizeof(struct bpf_perf_event_value))) 1701f005afedSYonghong Song goto clear; 1702f005afedSYonghong Song err = perf_event_read_local(ctx->event, &buf->counter, &buf->enabled, 1703f005afedSYonghong Song &buf->running); 1704f005afedSYonghong Song if (unlikely(err)) 1705f005afedSYonghong Song goto clear; 1706f005afedSYonghong Song return 0; 1707f005afedSYonghong Song clear: 1708f005afedSYonghong Song memset(buf, 0, size); 1709f005afedSYonghong Song return err; 1710f005afedSYonghong Song } 1711f005afedSYonghong Song 1712f005afedSYonghong Song static const struct bpf_func_proto bpf_perf_prog_read_value_proto = { 1713f005afedSYonghong Song .func = bpf_perf_prog_read_value, 1714f005afedSYonghong Song .gpl_only = true, 1715f005afedSYonghong Song .ret_type = RET_INTEGER, 1716f005afedSYonghong Song .arg1_type = ARG_PTR_TO_CTX, 1717f005afedSYonghong Song .arg2_type = ARG_PTR_TO_UNINIT_MEM, 1718f005afedSYonghong Song .arg3_type = ARG_CONST_SIZE, 1719f005afedSYonghong Song }; 1720f005afedSYonghong Song 1721fff7b643SDaniel Xu BPF_CALL_4(bpf_read_branch_records, struct bpf_perf_event_data_kern *, ctx, 1722fff7b643SDaniel Xu void *, buf, u32, size, u64, flags) 1723fff7b643SDaniel Xu { 1724fff7b643SDaniel Xu static const u32 br_entry_size = sizeof(struct perf_branch_entry); 1725fff7b643SDaniel Xu struct perf_branch_stack *br_stack = ctx->data->br_stack; 1726fff7b643SDaniel Xu u32 to_copy; 1727fff7b643SDaniel Xu 1728fff7b643SDaniel Xu if (unlikely(flags & ~BPF_F_GET_BRANCH_RECORDS_SIZE)) 1729fff7b643SDaniel Xu return -EINVAL; 1730fff7b643SDaniel Xu 1731cce6a2d7SJiri Olsa if (unlikely(!(ctx->data->sample_flags & PERF_SAMPLE_BRANCH_STACK))) 1732cce6a2d7SJiri Olsa return -ENOENT; 1733cce6a2d7SJiri Olsa 1734fff7b643SDaniel Xu if (unlikely(!br_stack)) 1735db52f572SKajol Jain return -ENOENT; 1736fff7b643SDaniel Xu 1737fff7b643SDaniel Xu if (flags & BPF_F_GET_BRANCH_RECORDS_SIZE) 1738fff7b643SDaniel Xu return br_stack->nr * br_entry_size; 1739fff7b643SDaniel Xu 1740fff7b643SDaniel Xu if (!buf || (size % br_entry_size != 0)) 1741fff7b643SDaniel Xu return -EINVAL; 1742fff7b643SDaniel Xu 1743fff7b643SDaniel Xu to_copy = min_t(u32, br_stack->nr * br_entry_size, size); 1744fff7b643SDaniel Xu memcpy(buf, br_stack->entries, to_copy); 1745fff7b643SDaniel Xu 1746fff7b643SDaniel Xu return to_copy; 1747fff7b643SDaniel Xu } 1748fff7b643SDaniel Xu 1749fff7b643SDaniel Xu static const struct bpf_func_proto bpf_read_branch_records_proto = { 1750fff7b643SDaniel Xu .func = bpf_read_branch_records, 1751fff7b643SDaniel Xu .gpl_only = true, 1752fff7b643SDaniel Xu .ret_type = RET_INTEGER, 1753fff7b643SDaniel Xu .arg1_type = ARG_PTR_TO_CTX, 1754fff7b643SDaniel Xu .arg2_type = ARG_PTR_TO_MEM_OR_NULL, 1755fff7b643SDaniel Xu .arg3_type = ARG_CONST_SIZE_OR_ZERO, 1756fff7b643SDaniel Xu .arg4_type = ARG_ANYTHING, 1757fff7b643SDaniel Xu }; 1758fff7b643SDaniel Xu 17595e43f899SAndrey Ignatov static const struct bpf_func_proto * 17605e43f899SAndrey Ignatov pe_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 1761f005afedSYonghong Song { 1762f005afedSYonghong Song switch (func_id) { 1763f005afedSYonghong Song case BPF_FUNC_perf_event_output: 1764f005afedSYonghong Song return &bpf_perf_event_output_proto_tp; 1765f005afedSYonghong Song case BPF_FUNC_get_stackid: 17667b04d6d6SSong Liu return &bpf_get_stackid_proto_pe; 1767c195651eSYonghong Song case BPF_FUNC_get_stack: 17687b04d6d6SSong Liu return &bpf_get_stack_proto_pe; 1769f005afedSYonghong Song case BPF_FUNC_perf_prog_read_value: 1770f005afedSYonghong Song return &bpf_perf_prog_read_value_proto; 1771fff7b643SDaniel Xu case BPF_FUNC_read_branch_records: 1772fff7b643SDaniel Xu return &bpf_read_branch_records_proto; 17737adfc6c9SAndrii Nakryiko case BPF_FUNC_get_attach_cookie: 17747adfc6c9SAndrii Nakryiko return &bpf_get_attach_cookie_proto_pe; 1775f005afedSYonghong Song default: 1776fc611f47SKP Singh return bpf_tracing_func_proto(func_id, prog); 1777f005afedSYonghong Song } 1778f005afedSYonghong Song } 1779f005afedSYonghong Song 1780c4f6699dSAlexei Starovoitov /* 1781c4f6699dSAlexei Starovoitov * bpf_raw_tp_regs are separate from bpf_pt_regs used from skb/xdp 1782c4f6699dSAlexei Starovoitov * to avoid potential recursive reuse issue when/if tracepoints are added 17839594dc3cSMatt Mullins * inside bpf_*_event_output, bpf_get_stackid and/or bpf_get_stack. 17849594dc3cSMatt Mullins * 17859594dc3cSMatt Mullins * Since raw tracepoints run despite bpf_prog_active, support concurrent usage 17869594dc3cSMatt Mullins * in normal, irq, and nmi context. 1787c4f6699dSAlexei Starovoitov */ 17889594dc3cSMatt Mullins struct bpf_raw_tp_regs { 17899594dc3cSMatt Mullins struct pt_regs regs[3]; 17909594dc3cSMatt Mullins }; 17919594dc3cSMatt Mullins static DEFINE_PER_CPU(struct bpf_raw_tp_regs, bpf_raw_tp_regs); 17929594dc3cSMatt Mullins static DEFINE_PER_CPU(int, bpf_raw_tp_nest_level); 17939594dc3cSMatt Mullins static struct pt_regs *get_bpf_raw_tp_regs(void) 17949594dc3cSMatt Mullins { 17959594dc3cSMatt Mullins struct bpf_raw_tp_regs *tp_regs = this_cpu_ptr(&bpf_raw_tp_regs); 17969594dc3cSMatt Mullins int nest_level = this_cpu_inc_return(bpf_raw_tp_nest_level); 17979594dc3cSMatt Mullins 17989594dc3cSMatt Mullins if (WARN_ON_ONCE(nest_level > ARRAY_SIZE(tp_regs->regs))) { 17999594dc3cSMatt Mullins this_cpu_dec(bpf_raw_tp_nest_level); 18009594dc3cSMatt Mullins return ERR_PTR(-EBUSY); 18019594dc3cSMatt Mullins } 18029594dc3cSMatt Mullins 18039594dc3cSMatt Mullins return &tp_regs->regs[nest_level - 1]; 18049594dc3cSMatt Mullins } 18059594dc3cSMatt Mullins 18069594dc3cSMatt Mullins static void put_bpf_raw_tp_regs(void) 18079594dc3cSMatt Mullins { 18089594dc3cSMatt Mullins this_cpu_dec(bpf_raw_tp_nest_level); 18099594dc3cSMatt Mullins } 18109594dc3cSMatt Mullins 1811c4f6699dSAlexei Starovoitov BPF_CALL_5(bpf_perf_event_output_raw_tp, struct bpf_raw_tracepoint_args *, args, 1812c4f6699dSAlexei Starovoitov struct bpf_map *, map, u64, flags, void *, data, u64, size) 1813c4f6699dSAlexei Starovoitov { 18149594dc3cSMatt Mullins struct pt_regs *regs = get_bpf_raw_tp_regs(); 18159594dc3cSMatt Mullins int ret; 18169594dc3cSMatt Mullins 18179594dc3cSMatt Mullins if (IS_ERR(regs)) 18189594dc3cSMatt Mullins return PTR_ERR(regs); 1819c4f6699dSAlexei Starovoitov 1820c4f6699dSAlexei Starovoitov perf_fetch_caller_regs(regs); 18219594dc3cSMatt Mullins ret = ____bpf_perf_event_output(regs, map, flags, data, size); 18229594dc3cSMatt Mullins 18239594dc3cSMatt Mullins put_bpf_raw_tp_regs(); 18249594dc3cSMatt Mullins return ret; 1825c4f6699dSAlexei Starovoitov } 1826c4f6699dSAlexei Starovoitov 1827c4f6699dSAlexei Starovoitov static const struct bpf_func_proto bpf_perf_event_output_proto_raw_tp = { 1828c4f6699dSAlexei Starovoitov .func = bpf_perf_event_output_raw_tp, 1829c4f6699dSAlexei Starovoitov .gpl_only = true, 1830c4f6699dSAlexei Starovoitov .ret_type = RET_INTEGER, 1831c4f6699dSAlexei Starovoitov .arg1_type = ARG_PTR_TO_CTX, 1832c4f6699dSAlexei Starovoitov .arg2_type = ARG_CONST_MAP_PTR, 1833c4f6699dSAlexei Starovoitov .arg3_type = ARG_ANYTHING, 1834216e3cd2SHao Luo .arg4_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1835c4f6699dSAlexei Starovoitov .arg5_type = ARG_CONST_SIZE_OR_ZERO, 1836c4f6699dSAlexei Starovoitov }; 1837c4f6699dSAlexei Starovoitov 1838a7658e1aSAlexei Starovoitov extern const struct bpf_func_proto bpf_skb_output_proto; 1839d831ee84SEelco Chaudron extern const struct bpf_func_proto bpf_xdp_output_proto; 1840d9917302SEelco Chaudron extern const struct bpf_func_proto bpf_xdp_get_buff_len_trace_proto; 1841a7658e1aSAlexei Starovoitov 1842c4f6699dSAlexei Starovoitov BPF_CALL_3(bpf_get_stackid_raw_tp, struct bpf_raw_tracepoint_args *, args, 1843c4f6699dSAlexei Starovoitov struct bpf_map *, map, u64, flags) 1844c4f6699dSAlexei Starovoitov { 18459594dc3cSMatt Mullins struct pt_regs *regs = get_bpf_raw_tp_regs(); 18469594dc3cSMatt Mullins int ret; 18479594dc3cSMatt Mullins 18489594dc3cSMatt Mullins if (IS_ERR(regs)) 18499594dc3cSMatt Mullins return PTR_ERR(regs); 1850c4f6699dSAlexei Starovoitov 1851c4f6699dSAlexei Starovoitov perf_fetch_caller_regs(regs); 1852c4f6699dSAlexei Starovoitov /* similar to bpf_perf_event_output_tp, but pt_regs fetched differently */ 18539594dc3cSMatt Mullins ret = bpf_get_stackid((unsigned long) regs, (unsigned long) map, 1854c4f6699dSAlexei Starovoitov flags, 0, 0); 18559594dc3cSMatt Mullins put_bpf_raw_tp_regs(); 18569594dc3cSMatt Mullins return ret; 1857c4f6699dSAlexei Starovoitov } 1858c4f6699dSAlexei Starovoitov 1859c4f6699dSAlexei Starovoitov static const struct bpf_func_proto bpf_get_stackid_proto_raw_tp = { 1860c4f6699dSAlexei Starovoitov .func = bpf_get_stackid_raw_tp, 1861c4f6699dSAlexei Starovoitov .gpl_only = true, 1862c4f6699dSAlexei Starovoitov .ret_type = RET_INTEGER, 1863c4f6699dSAlexei Starovoitov .arg1_type = ARG_PTR_TO_CTX, 1864c4f6699dSAlexei Starovoitov .arg2_type = ARG_CONST_MAP_PTR, 1865c4f6699dSAlexei Starovoitov .arg3_type = ARG_ANYTHING, 1866c4f6699dSAlexei Starovoitov }; 1867c4f6699dSAlexei Starovoitov 1868c195651eSYonghong Song BPF_CALL_4(bpf_get_stack_raw_tp, struct bpf_raw_tracepoint_args *, args, 1869c195651eSYonghong Song void *, buf, u32, size, u64, flags) 1870c195651eSYonghong Song { 18719594dc3cSMatt Mullins struct pt_regs *regs = get_bpf_raw_tp_regs(); 18729594dc3cSMatt Mullins int ret; 18739594dc3cSMatt Mullins 18749594dc3cSMatt Mullins if (IS_ERR(regs)) 18759594dc3cSMatt Mullins return PTR_ERR(regs); 1876c195651eSYonghong Song 1877c195651eSYonghong Song perf_fetch_caller_regs(regs); 18789594dc3cSMatt Mullins ret = bpf_get_stack((unsigned long) regs, (unsigned long) buf, 1879c195651eSYonghong Song (unsigned long) size, flags, 0); 18809594dc3cSMatt Mullins put_bpf_raw_tp_regs(); 18819594dc3cSMatt Mullins return ret; 1882c195651eSYonghong Song } 1883c195651eSYonghong Song 1884c195651eSYonghong Song static const struct bpf_func_proto bpf_get_stack_proto_raw_tp = { 1885c195651eSYonghong Song .func = bpf_get_stack_raw_tp, 1886c195651eSYonghong Song .gpl_only = true, 1887c195651eSYonghong Song .ret_type = RET_INTEGER, 1888c195651eSYonghong Song .arg1_type = ARG_PTR_TO_CTX, 1889216e3cd2SHao Luo .arg2_type = ARG_PTR_TO_MEM | MEM_RDONLY, 1890c195651eSYonghong Song .arg3_type = ARG_CONST_SIZE_OR_ZERO, 1891c195651eSYonghong Song .arg4_type = ARG_ANYTHING, 1892c195651eSYonghong Song }; 1893c195651eSYonghong Song 18945e43f899SAndrey Ignatov static const struct bpf_func_proto * 18955e43f899SAndrey Ignatov raw_tp_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 1896c4f6699dSAlexei Starovoitov { 1897c4f6699dSAlexei Starovoitov switch (func_id) { 1898c4f6699dSAlexei Starovoitov case BPF_FUNC_perf_event_output: 1899c4f6699dSAlexei Starovoitov return &bpf_perf_event_output_proto_raw_tp; 1900c4f6699dSAlexei Starovoitov case BPF_FUNC_get_stackid: 1901c4f6699dSAlexei Starovoitov return &bpf_get_stackid_proto_raw_tp; 1902c195651eSYonghong Song case BPF_FUNC_get_stack: 1903c195651eSYonghong Song return &bpf_get_stack_proto_raw_tp; 1904c4f6699dSAlexei Starovoitov default: 1905fc611f47SKP Singh return bpf_tracing_func_proto(func_id, prog); 1906c4f6699dSAlexei Starovoitov } 1907c4f6699dSAlexei Starovoitov } 1908c4f6699dSAlexei Starovoitov 1909958a3f2dSJiri Olsa const struct bpf_func_proto * 1910f1b9509cSAlexei Starovoitov tracing_prog_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog) 1911f1b9509cSAlexei Starovoitov { 19123cee6fb8SMartin KaFai Lau const struct bpf_func_proto *fn; 19133cee6fb8SMartin KaFai Lau 1914f1b9509cSAlexei Starovoitov switch (func_id) { 1915f1b9509cSAlexei Starovoitov #ifdef CONFIG_NET 1916f1b9509cSAlexei Starovoitov case BPF_FUNC_skb_output: 1917f1b9509cSAlexei Starovoitov return &bpf_skb_output_proto; 1918d831ee84SEelco Chaudron case BPF_FUNC_xdp_output: 1919d831ee84SEelco Chaudron return &bpf_xdp_output_proto; 1920af7ec138SYonghong Song case BPF_FUNC_skc_to_tcp6_sock: 1921af7ec138SYonghong Song return &bpf_skc_to_tcp6_sock_proto; 1922478cfbdfSYonghong Song case BPF_FUNC_skc_to_tcp_sock: 1923478cfbdfSYonghong Song return &bpf_skc_to_tcp_sock_proto; 1924478cfbdfSYonghong Song case BPF_FUNC_skc_to_tcp_timewait_sock: 1925478cfbdfSYonghong Song return &bpf_skc_to_tcp_timewait_sock_proto; 1926478cfbdfSYonghong Song case BPF_FUNC_skc_to_tcp_request_sock: 1927478cfbdfSYonghong Song return &bpf_skc_to_tcp_request_sock_proto; 19280d4fad3eSYonghong Song case BPF_FUNC_skc_to_udp6_sock: 19290d4fad3eSYonghong Song return &bpf_skc_to_udp6_sock_proto; 19309eeb3aa3SHengqi Chen case BPF_FUNC_skc_to_unix_sock: 19319eeb3aa3SHengqi Chen return &bpf_skc_to_unix_sock_proto; 19323bc253c2SGeliang Tang case BPF_FUNC_skc_to_mptcp_sock: 19333bc253c2SGeliang Tang return &bpf_skc_to_mptcp_sock_proto; 19348e4597c6SMartin KaFai Lau case BPF_FUNC_sk_storage_get: 19358e4597c6SMartin KaFai Lau return &bpf_sk_storage_get_tracing_proto; 19368e4597c6SMartin KaFai Lau case BPF_FUNC_sk_storage_delete: 19378e4597c6SMartin KaFai Lau return &bpf_sk_storage_delete_tracing_proto; 1938b60da495SFlorent Revest case BPF_FUNC_sock_from_file: 1939b60da495SFlorent Revest return &bpf_sock_from_file_proto; 1940c5dbb89fSFlorent Revest case BPF_FUNC_get_socket_cookie: 1941c5dbb89fSFlorent Revest return &bpf_get_socket_ptr_cookie_proto; 1942d9917302SEelco Chaudron case BPF_FUNC_xdp_get_buff_len: 1943d9917302SEelco Chaudron return &bpf_xdp_get_buff_len_trace_proto; 1944f1b9509cSAlexei Starovoitov #endif 1945492e639fSYonghong Song case BPF_FUNC_seq_printf: 1946492e639fSYonghong Song return prog->expected_attach_type == BPF_TRACE_ITER ? 1947492e639fSYonghong Song &bpf_seq_printf_proto : 1948492e639fSYonghong Song NULL; 1949492e639fSYonghong Song case BPF_FUNC_seq_write: 1950492e639fSYonghong Song return prog->expected_attach_type == BPF_TRACE_ITER ? 1951492e639fSYonghong Song &bpf_seq_write_proto : 1952492e639fSYonghong Song NULL; 1953eb411377SAlan Maguire case BPF_FUNC_seq_printf_btf: 1954eb411377SAlan Maguire return prog->expected_attach_type == BPF_TRACE_ITER ? 1955eb411377SAlan Maguire &bpf_seq_printf_btf_proto : 1956eb411377SAlan Maguire NULL; 19576e22ab9dSJiri Olsa case BPF_FUNC_d_path: 19586e22ab9dSJiri Olsa return &bpf_d_path_proto; 1959f92c1e18SJiri Olsa case BPF_FUNC_get_func_arg: 1960f92c1e18SJiri Olsa return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_proto : NULL; 1961f92c1e18SJiri Olsa case BPF_FUNC_get_func_ret: 1962f92c1e18SJiri Olsa return bpf_prog_has_trampoline(prog) ? &bpf_get_func_ret_proto : NULL; 1963f92c1e18SJiri Olsa case BPF_FUNC_get_func_arg_cnt: 1964f92c1e18SJiri Olsa return bpf_prog_has_trampoline(prog) ? &bpf_get_func_arg_cnt_proto : NULL; 19652fcc8241SKui-Feng Lee case BPF_FUNC_get_attach_cookie: 19662fcc8241SKui-Feng Lee return bpf_prog_has_trampoline(prog) ? &bpf_get_attach_cookie_proto_tracing : NULL; 1967f1b9509cSAlexei Starovoitov default: 19683cee6fb8SMartin KaFai Lau fn = raw_tp_prog_func_proto(func_id, prog); 19693cee6fb8SMartin KaFai Lau if (!fn && prog->expected_attach_type == BPF_TRACE_ITER) 19703cee6fb8SMartin KaFai Lau fn = bpf_iter_get_func_proto(func_id, prog); 19713cee6fb8SMartin KaFai Lau return fn; 1972f1b9509cSAlexei Starovoitov } 1973f1b9509cSAlexei Starovoitov } 1974f1b9509cSAlexei Starovoitov 1975c4f6699dSAlexei Starovoitov static bool raw_tp_prog_is_valid_access(int off, int size, 1976c4f6699dSAlexei Starovoitov enum bpf_access_type type, 19775e43f899SAndrey Ignatov const struct bpf_prog *prog, 1978c4f6699dSAlexei Starovoitov struct bpf_insn_access_aux *info) 1979c4f6699dSAlexei Starovoitov { 198035346ab6SHou Tao return bpf_tracing_ctx_access(off, size, type); 1981f1b9509cSAlexei Starovoitov } 1982f1b9509cSAlexei Starovoitov 1983f1b9509cSAlexei Starovoitov static bool tracing_prog_is_valid_access(int off, int size, 1984f1b9509cSAlexei Starovoitov enum bpf_access_type type, 1985f1b9509cSAlexei Starovoitov const struct bpf_prog *prog, 1986f1b9509cSAlexei Starovoitov struct bpf_insn_access_aux *info) 1987f1b9509cSAlexei Starovoitov { 198835346ab6SHou Tao return bpf_tracing_btf_ctx_access(off, size, type, prog, info); 1989c4f6699dSAlexei Starovoitov } 1990c4f6699dSAlexei Starovoitov 19913e7c67d9SKP Singh int __weak bpf_prog_test_run_tracing(struct bpf_prog *prog, 19923e7c67d9SKP Singh const union bpf_attr *kattr, 19933e7c67d9SKP Singh union bpf_attr __user *uattr) 19943e7c67d9SKP Singh { 19953e7c67d9SKP Singh return -ENOTSUPP; 19963e7c67d9SKP Singh } 19973e7c67d9SKP Singh 1998c4f6699dSAlexei Starovoitov const struct bpf_verifier_ops raw_tracepoint_verifier_ops = { 1999c4f6699dSAlexei Starovoitov .get_func_proto = raw_tp_prog_func_proto, 2000c4f6699dSAlexei Starovoitov .is_valid_access = raw_tp_prog_is_valid_access, 2001c4f6699dSAlexei Starovoitov }; 2002c4f6699dSAlexei Starovoitov 2003c4f6699dSAlexei Starovoitov const struct bpf_prog_ops raw_tracepoint_prog_ops = { 2004ebfb4d40SYonghong Song #ifdef CONFIG_NET 20051b4d60ecSSong Liu .test_run = bpf_prog_test_run_raw_tp, 2006ebfb4d40SYonghong Song #endif 2007c4f6699dSAlexei Starovoitov }; 2008c4f6699dSAlexei Starovoitov 2009f1b9509cSAlexei Starovoitov const struct bpf_verifier_ops tracing_verifier_ops = { 2010f1b9509cSAlexei Starovoitov .get_func_proto = tracing_prog_func_proto, 2011f1b9509cSAlexei Starovoitov .is_valid_access = tracing_prog_is_valid_access, 2012f1b9509cSAlexei Starovoitov }; 2013f1b9509cSAlexei Starovoitov 2014f1b9509cSAlexei Starovoitov const struct bpf_prog_ops tracing_prog_ops = { 2015da00d2f1SKP Singh .test_run = bpf_prog_test_run_tracing, 2016f1b9509cSAlexei Starovoitov }; 2017f1b9509cSAlexei Starovoitov 20189df1c28bSMatt Mullins static bool raw_tp_writable_prog_is_valid_access(int off, int size, 20199df1c28bSMatt Mullins enum bpf_access_type type, 20209df1c28bSMatt Mullins const struct bpf_prog *prog, 20219df1c28bSMatt Mullins struct bpf_insn_access_aux *info) 20229df1c28bSMatt Mullins { 20239df1c28bSMatt Mullins if (off == 0) { 20249df1c28bSMatt Mullins if (size != sizeof(u64) || type != BPF_READ) 20259df1c28bSMatt Mullins return false; 20269df1c28bSMatt Mullins info->reg_type = PTR_TO_TP_BUFFER; 20279df1c28bSMatt Mullins } 20289df1c28bSMatt Mullins return raw_tp_prog_is_valid_access(off, size, type, prog, info); 20299df1c28bSMatt Mullins } 20309df1c28bSMatt Mullins 20319df1c28bSMatt Mullins const struct bpf_verifier_ops raw_tracepoint_writable_verifier_ops = { 20329df1c28bSMatt Mullins .get_func_proto = raw_tp_prog_func_proto, 20339df1c28bSMatt Mullins .is_valid_access = raw_tp_writable_prog_is_valid_access, 20349df1c28bSMatt Mullins }; 20359df1c28bSMatt Mullins 20369df1c28bSMatt Mullins const struct bpf_prog_ops raw_tracepoint_writable_prog_ops = { 20379df1c28bSMatt Mullins }; 20389df1c28bSMatt Mullins 20390515e599SAlexei Starovoitov static bool pe_prog_is_valid_access(int off, int size, enum bpf_access_type type, 20405e43f899SAndrey Ignatov const struct bpf_prog *prog, 204123994631SYonghong Song struct bpf_insn_access_aux *info) 20420515e599SAlexei Starovoitov { 204395da0cdbSTeng Qin const int size_u64 = sizeof(u64); 204431fd8581SYonghong Song 20450515e599SAlexei Starovoitov if (off < 0 || off >= sizeof(struct bpf_perf_event_data)) 20460515e599SAlexei Starovoitov return false; 20470515e599SAlexei Starovoitov if (type != BPF_READ) 20480515e599SAlexei Starovoitov return false; 2049bc23105cSDaniel Borkmann if (off % size != 0) { 2050bc23105cSDaniel Borkmann if (sizeof(unsigned long) != 4) 20510515e599SAlexei Starovoitov return false; 2052bc23105cSDaniel Borkmann if (size != 8) 2053bc23105cSDaniel Borkmann return false; 2054bc23105cSDaniel Borkmann if (off % size != 4) 2055bc23105cSDaniel Borkmann return false; 2056bc23105cSDaniel Borkmann } 205731fd8581SYonghong Song 2058f96da094SDaniel Borkmann switch (off) { 2059f96da094SDaniel Borkmann case bpf_ctx_range(struct bpf_perf_event_data, sample_period): 206095da0cdbSTeng Qin bpf_ctx_record_field_size(info, size_u64); 206195da0cdbSTeng Qin if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) 206295da0cdbSTeng Qin return false; 206395da0cdbSTeng Qin break; 206495da0cdbSTeng Qin case bpf_ctx_range(struct bpf_perf_event_data, addr): 206595da0cdbSTeng Qin bpf_ctx_record_field_size(info, size_u64); 206695da0cdbSTeng Qin if (!bpf_ctx_narrow_access_ok(off, size, size_u64)) 206723994631SYonghong Song return false; 2068f96da094SDaniel Borkmann break; 2069f96da094SDaniel Borkmann default: 20700515e599SAlexei Starovoitov if (size != sizeof(long)) 20710515e599SAlexei Starovoitov return false; 20720515e599SAlexei Starovoitov } 2073f96da094SDaniel Borkmann 20740515e599SAlexei Starovoitov return true; 20750515e599SAlexei Starovoitov } 20760515e599SAlexei Starovoitov 20776b8cc1d1SDaniel Borkmann static u32 pe_prog_convert_ctx_access(enum bpf_access_type type, 20786b8cc1d1SDaniel Borkmann const struct bpf_insn *si, 20790515e599SAlexei Starovoitov struct bpf_insn *insn_buf, 2080f96da094SDaniel Borkmann struct bpf_prog *prog, u32 *target_size) 20810515e599SAlexei Starovoitov { 20820515e599SAlexei Starovoitov struct bpf_insn *insn = insn_buf; 20830515e599SAlexei Starovoitov 20846b8cc1d1SDaniel Borkmann switch (si->off) { 20850515e599SAlexei Starovoitov case offsetof(struct bpf_perf_event_data, sample_period): 2086f035a515SDaniel Borkmann *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, 20876b8cc1d1SDaniel Borkmann data), si->dst_reg, si->src_reg, 20880515e599SAlexei Starovoitov offsetof(struct bpf_perf_event_data_kern, data)); 20896b8cc1d1SDaniel Borkmann *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 2090f96da094SDaniel Borkmann bpf_target_off(struct perf_sample_data, period, 8, 2091f96da094SDaniel Borkmann target_size)); 20920515e599SAlexei Starovoitov break; 209395da0cdbSTeng Qin case offsetof(struct bpf_perf_event_data, addr): 209495da0cdbSTeng Qin *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, 209595da0cdbSTeng Qin data), si->dst_reg, si->src_reg, 209695da0cdbSTeng Qin offsetof(struct bpf_perf_event_data_kern, data)); 209795da0cdbSTeng Qin *insn++ = BPF_LDX_MEM(BPF_DW, si->dst_reg, si->dst_reg, 209895da0cdbSTeng Qin bpf_target_off(struct perf_sample_data, addr, 8, 209995da0cdbSTeng Qin target_size)); 210095da0cdbSTeng Qin break; 21010515e599SAlexei Starovoitov default: 2102f035a515SDaniel Borkmann *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_perf_event_data_kern, 21036b8cc1d1SDaniel Borkmann regs), si->dst_reg, si->src_reg, 21040515e599SAlexei Starovoitov offsetof(struct bpf_perf_event_data_kern, regs)); 21056b8cc1d1SDaniel Borkmann *insn++ = BPF_LDX_MEM(BPF_SIZEOF(long), si->dst_reg, si->dst_reg, 21066b8cc1d1SDaniel Borkmann si->off); 21070515e599SAlexei Starovoitov break; 21080515e599SAlexei Starovoitov } 21090515e599SAlexei Starovoitov 21100515e599SAlexei Starovoitov return insn - insn_buf; 21110515e599SAlexei Starovoitov } 21120515e599SAlexei Starovoitov 21137de16e3aSJakub Kicinski const struct bpf_verifier_ops perf_event_verifier_ops = { 2114f005afedSYonghong Song .get_func_proto = pe_prog_func_proto, 21150515e599SAlexei Starovoitov .is_valid_access = pe_prog_is_valid_access, 21160515e599SAlexei Starovoitov .convert_ctx_access = pe_prog_convert_ctx_access, 21170515e599SAlexei Starovoitov }; 21187de16e3aSJakub Kicinski 21197de16e3aSJakub Kicinski const struct bpf_prog_ops perf_event_prog_ops = { 21207de16e3aSJakub Kicinski }; 2121e87c6bc3SYonghong Song 2122e87c6bc3SYonghong Song static DEFINE_MUTEX(bpf_event_mutex); 2123e87c6bc3SYonghong Song 2124c8c088baSYonghong Song #define BPF_TRACE_MAX_PROGS 64 2125c8c088baSYonghong Song 2126e87c6bc3SYonghong Song int perf_event_attach_bpf_prog(struct perf_event *event, 212782e6b1eeSAndrii Nakryiko struct bpf_prog *prog, 212882e6b1eeSAndrii Nakryiko u64 bpf_cookie) 2129e87c6bc3SYonghong Song { 2130e672db03SStanislav Fomichev struct bpf_prog_array *old_array; 2131e87c6bc3SYonghong Song struct bpf_prog_array *new_array; 2132e87c6bc3SYonghong Song int ret = -EEXIST; 2133e87c6bc3SYonghong Song 21349802d865SJosef Bacik /* 2135b4da3340SMasami Hiramatsu * Kprobe override only works if they are on the function entry, 2136b4da3340SMasami Hiramatsu * and only if they are on the opt-in list. 21379802d865SJosef Bacik */ 21389802d865SJosef Bacik if (prog->kprobe_override && 2139b4da3340SMasami Hiramatsu (!trace_kprobe_on_func_entry(event->tp_event) || 21409802d865SJosef Bacik !trace_kprobe_error_injectable(event->tp_event))) 21419802d865SJosef Bacik return -EINVAL; 21429802d865SJosef Bacik 2143e87c6bc3SYonghong Song mutex_lock(&bpf_event_mutex); 2144e87c6bc3SYonghong Song 2145e87c6bc3SYonghong Song if (event->prog) 214607c41a29SYonghong Song goto unlock; 2147e87c6bc3SYonghong Song 2148e672db03SStanislav Fomichev old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); 2149c8c088baSYonghong Song if (old_array && 2150c8c088baSYonghong Song bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) { 2151c8c088baSYonghong Song ret = -E2BIG; 2152c8c088baSYonghong Song goto unlock; 2153c8c088baSYonghong Song } 2154c8c088baSYonghong Song 215582e6b1eeSAndrii Nakryiko ret = bpf_prog_array_copy(old_array, NULL, prog, bpf_cookie, &new_array); 2156e87c6bc3SYonghong Song if (ret < 0) 215707c41a29SYonghong Song goto unlock; 2158e87c6bc3SYonghong Song 2159e87c6bc3SYonghong Song /* set the new array to event->tp_event and set event->prog */ 2160e87c6bc3SYonghong Song event->prog = prog; 216182e6b1eeSAndrii Nakryiko event->bpf_cookie = bpf_cookie; 2162e87c6bc3SYonghong Song rcu_assign_pointer(event->tp_event->prog_array, new_array); 21638c7dcb84SDelyan Kratunov bpf_prog_array_free_sleepable(old_array); 2164e87c6bc3SYonghong Song 216507c41a29SYonghong Song unlock: 2166e87c6bc3SYonghong Song mutex_unlock(&bpf_event_mutex); 2167e87c6bc3SYonghong Song return ret; 2168e87c6bc3SYonghong Song } 2169e87c6bc3SYonghong Song 2170e87c6bc3SYonghong Song void perf_event_detach_bpf_prog(struct perf_event *event) 2171e87c6bc3SYonghong Song { 2172e672db03SStanislav Fomichev struct bpf_prog_array *old_array; 2173e87c6bc3SYonghong Song struct bpf_prog_array *new_array; 2174e87c6bc3SYonghong Song int ret; 2175e87c6bc3SYonghong Song 2176e87c6bc3SYonghong Song mutex_lock(&bpf_event_mutex); 2177e87c6bc3SYonghong Song 2178e87c6bc3SYonghong Song if (!event->prog) 217907c41a29SYonghong Song goto unlock; 2180e87c6bc3SYonghong Song 2181e672db03SStanislav Fomichev old_array = bpf_event_rcu_dereference(event->tp_event->prog_array); 218282e6b1eeSAndrii Nakryiko ret = bpf_prog_array_copy(old_array, event->prog, NULL, 0, &new_array); 2183170a7e3eSSean Young if (ret == -ENOENT) 2184170a7e3eSSean Young goto unlock; 2185e87c6bc3SYonghong Song if (ret < 0) { 2186e87c6bc3SYonghong Song bpf_prog_array_delete_safe(old_array, event->prog); 2187e87c6bc3SYonghong Song } else { 2188e87c6bc3SYonghong Song rcu_assign_pointer(event->tp_event->prog_array, new_array); 21898c7dcb84SDelyan Kratunov bpf_prog_array_free_sleepable(old_array); 2190e87c6bc3SYonghong Song } 2191e87c6bc3SYonghong Song 2192e87c6bc3SYonghong Song bpf_prog_put(event->prog); 2193e87c6bc3SYonghong Song event->prog = NULL; 2194e87c6bc3SYonghong Song 219507c41a29SYonghong Song unlock: 2196e87c6bc3SYonghong Song mutex_unlock(&bpf_event_mutex); 2197e87c6bc3SYonghong Song } 2198f371b304SYonghong Song 2199f4e2298eSYonghong Song int perf_event_query_prog_array(struct perf_event *event, void __user *info) 2200f371b304SYonghong Song { 2201f371b304SYonghong Song struct perf_event_query_bpf __user *uquery = info; 2202f371b304SYonghong Song struct perf_event_query_bpf query = {}; 2203e672db03SStanislav Fomichev struct bpf_prog_array *progs; 22043a38bb98SYonghong Song u32 *ids, prog_cnt, ids_len; 2205f371b304SYonghong Song int ret; 2206f371b304SYonghong Song 2207031258daSAlexey Budankov if (!perfmon_capable()) 2208f371b304SYonghong Song return -EPERM; 2209f371b304SYonghong Song if (event->attr.type != PERF_TYPE_TRACEPOINT) 2210f371b304SYonghong Song return -EINVAL; 2211f371b304SYonghong Song if (copy_from_user(&query, uquery, sizeof(query))) 2212f371b304SYonghong Song return -EFAULT; 22133a38bb98SYonghong Song 22143a38bb98SYonghong Song ids_len = query.ids_len; 22153a38bb98SYonghong Song if (ids_len > BPF_TRACE_MAX_PROGS) 22169c481b90SDaniel Borkmann return -E2BIG; 22173a38bb98SYonghong Song ids = kcalloc(ids_len, sizeof(u32), GFP_USER | __GFP_NOWARN); 22183a38bb98SYonghong Song if (!ids) 22193a38bb98SYonghong Song return -ENOMEM; 22203a38bb98SYonghong Song /* 22213a38bb98SYonghong Song * The above kcalloc returns ZERO_SIZE_PTR when ids_len = 0, which 22223a38bb98SYonghong Song * is required when user only wants to check for uquery->prog_cnt. 22233a38bb98SYonghong Song * There is no need to check for it since the case is handled 22243a38bb98SYonghong Song * gracefully in bpf_prog_array_copy_info. 22253a38bb98SYonghong Song */ 2226f371b304SYonghong Song 2227f371b304SYonghong Song mutex_lock(&bpf_event_mutex); 2228e672db03SStanislav Fomichev progs = bpf_event_rcu_dereference(event->tp_event->prog_array); 2229e672db03SStanislav Fomichev ret = bpf_prog_array_copy_info(progs, ids, ids_len, &prog_cnt); 2230f371b304SYonghong Song mutex_unlock(&bpf_event_mutex); 2231f371b304SYonghong Song 22323a38bb98SYonghong Song if (copy_to_user(&uquery->prog_cnt, &prog_cnt, sizeof(prog_cnt)) || 22333a38bb98SYonghong Song copy_to_user(uquery->ids, ids, ids_len * sizeof(u32))) 22343a38bb98SYonghong Song ret = -EFAULT; 22353a38bb98SYonghong Song 22363a38bb98SYonghong Song kfree(ids); 2237f371b304SYonghong Song return ret; 2238f371b304SYonghong Song } 2239c4f6699dSAlexei Starovoitov 2240c4f6699dSAlexei Starovoitov extern struct bpf_raw_event_map __start__bpf_raw_tp[]; 2241c4f6699dSAlexei Starovoitov extern struct bpf_raw_event_map __stop__bpf_raw_tp[]; 2242c4f6699dSAlexei Starovoitov 2243a38d1107SMatt Mullins struct bpf_raw_event_map *bpf_get_raw_tracepoint(const char *name) 2244c4f6699dSAlexei Starovoitov { 2245c4f6699dSAlexei Starovoitov struct bpf_raw_event_map *btp = __start__bpf_raw_tp; 2246c4f6699dSAlexei Starovoitov 2247c4f6699dSAlexei Starovoitov for (; btp < __stop__bpf_raw_tp; btp++) { 2248c4f6699dSAlexei Starovoitov if (!strcmp(btp->tp->name, name)) 2249c4f6699dSAlexei Starovoitov return btp; 2250c4f6699dSAlexei Starovoitov } 2251a38d1107SMatt Mullins 2252a38d1107SMatt Mullins return bpf_get_raw_tracepoint_module(name); 2253a38d1107SMatt Mullins } 2254a38d1107SMatt Mullins 2255a38d1107SMatt Mullins void bpf_put_raw_tracepoint(struct bpf_raw_event_map *btp) 2256a38d1107SMatt Mullins { 225712cc126dSAndrii Nakryiko struct module *mod; 2258a38d1107SMatt Mullins 225912cc126dSAndrii Nakryiko preempt_disable(); 226012cc126dSAndrii Nakryiko mod = __module_address((unsigned long)btp); 2261a38d1107SMatt Mullins module_put(mod); 226212cc126dSAndrii Nakryiko preempt_enable(); 2263c4f6699dSAlexei Starovoitov } 2264c4f6699dSAlexei Starovoitov 2265c4f6699dSAlexei Starovoitov static __always_inline 2266c4f6699dSAlexei Starovoitov void __bpf_trace_run(struct bpf_prog *prog, u64 *args) 2267c4f6699dSAlexei Starovoitov { 2268f03efe49SThomas Gleixner cant_sleep(); 226905b24ff9SJiri Olsa if (unlikely(this_cpu_inc_return(*(prog->active)) != 1)) { 227005b24ff9SJiri Olsa bpf_prog_inc_misses_counter(prog); 227105b24ff9SJiri Olsa goto out; 227205b24ff9SJiri Olsa } 2273c4f6699dSAlexei Starovoitov rcu_read_lock(); 2274fb7dd8bcSAndrii Nakryiko (void) bpf_prog_run(prog, args); 2275c4f6699dSAlexei Starovoitov rcu_read_unlock(); 227605b24ff9SJiri Olsa out: 227705b24ff9SJiri Olsa this_cpu_dec(*(prog->active)); 2278c4f6699dSAlexei Starovoitov } 2279c4f6699dSAlexei Starovoitov 2280c4f6699dSAlexei Starovoitov #define UNPACK(...) __VA_ARGS__ 2281c4f6699dSAlexei Starovoitov #define REPEAT_1(FN, DL, X, ...) FN(X) 2282c4f6699dSAlexei Starovoitov #define REPEAT_2(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_1(FN, DL, __VA_ARGS__) 2283c4f6699dSAlexei Starovoitov #define REPEAT_3(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_2(FN, DL, __VA_ARGS__) 2284c4f6699dSAlexei Starovoitov #define REPEAT_4(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_3(FN, DL, __VA_ARGS__) 2285c4f6699dSAlexei Starovoitov #define REPEAT_5(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_4(FN, DL, __VA_ARGS__) 2286c4f6699dSAlexei Starovoitov #define REPEAT_6(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_5(FN, DL, __VA_ARGS__) 2287c4f6699dSAlexei Starovoitov #define REPEAT_7(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_6(FN, DL, __VA_ARGS__) 2288c4f6699dSAlexei Starovoitov #define REPEAT_8(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_7(FN, DL, __VA_ARGS__) 2289c4f6699dSAlexei Starovoitov #define REPEAT_9(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_8(FN, DL, __VA_ARGS__) 2290c4f6699dSAlexei Starovoitov #define REPEAT_10(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_9(FN, DL, __VA_ARGS__) 2291c4f6699dSAlexei Starovoitov #define REPEAT_11(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_10(FN, DL, __VA_ARGS__) 2292c4f6699dSAlexei Starovoitov #define REPEAT_12(FN, DL, X, ...) FN(X) UNPACK DL REPEAT_11(FN, DL, __VA_ARGS__) 2293c4f6699dSAlexei Starovoitov #define REPEAT(X, FN, DL, ...) REPEAT_##X(FN, DL, __VA_ARGS__) 2294c4f6699dSAlexei Starovoitov 2295c4f6699dSAlexei Starovoitov #define SARG(X) u64 arg##X 2296c4f6699dSAlexei Starovoitov #define COPY(X) args[X] = arg##X 2297c4f6699dSAlexei Starovoitov 2298c4f6699dSAlexei Starovoitov #define __DL_COM (,) 2299c4f6699dSAlexei Starovoitov #define __DL_SEM (;) 2300c4f6699dSAlexei Starovoitov 2301c4f6699dSAlexei Starovoitov #define __SEQ_0_11 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 2302c4f6699dSAlexei Starovoitov 2303c4f6699dSAlexei Starovoitov #define BPF_TRACE_DEFN_x(x) \ 2304c4f6699dSAlexei Starovoitov void bpf_trace_run##x(struct bpf_prog *prog, \ 2305c4f6699dSAlexei Starovoitov REPEAT(x, SARG, __DL_COM, __SEQ_0_11)) \ 2306c4f6699dSAlexei Starovoitov { \ 2307c4f6699dSAlexei Starovoitov u64 args[x]; \ 2308c4f6699dSAlexei Starovoitov REPEAT(x, COPY, __DL_SEM, __SEQ_0_11); \ 2309c4f6699dSAlexei Starovoitov __bpf_trace_run(prog, args); \ 2310c4f6699dSAlexei Starovoitov } \ 2311c4f6699dSAlexei Starovoitov EXPORT_SYMBOL_GPL(bpf_trace_run##x) 2312c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(1); 2313c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(2); 2314c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(3); 2315c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(4); 2316c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(5); 2317c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(6); 2318c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(7); 2319c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(8); 2320c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(9); 2321c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(10); 2322c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(11); 2323c4f6699dSAlexei Starovoitov BPF_TRACE_DEFN_x(12); 2324c4f6699dSAlexei Starovoitov 2325c4f6699dSAlexei Starovoitov static int __bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog) 2326c4f6699dSAlexei Starovoitov { 2327c4f6699dSAlexei Starovoitov struct tracepoint *tp = btp->tp; 2328c4f6699dSAlexei Starovoitov 2329c4f6699dSAlexei Starovoitov /* 2330c4f6699dSAlexei Starovoitov * check that program doesn't access arguments beyond what's 2331c4f6699dSAlexei Starovoitov * available in this tracepoint 2332c4f6699dSAlexei Starovoitov */ 2333c4f6699dSAlexei Starovoitov if (prog->aux->max_ctx_offset > btp->num_args * sizeof(u64)) 2334c4f6699dSAlexei Starovoitov return -EINVAL; 2335c4f6699dSAlexei Starovoitov 23369df1c28bSMatt Mullins if (prog->aux->max_tp_access > btp->writable_size) 23379df1c28bSMatt Mullins return -EINVAL; 23389df1c28bSMatt Mullins 23399913d574SSteven Rostedt (VMware) return tracepoint_probe_register_may_exist(tp, (void *)btp->bpf_func, 23409913d574SSteven Rostedt (VMware) prog); 2341c4f6699dSAlexei Starovoitov } 2342c4f6699dSAlexei Starovoitov 2343c4f6699dSAlexei Starovoitov int bpf_probe_register(struct bpf_raw_event_map *btp, struct bpf_prog *prog) 2344c4f6699dSAlexei Starovoitov { 2345e16ec340SAlexei Starovoitov return __bpf_probe_register(btp, prog); 2346c4f6699dSAlexei Starovoitov } 2347c4f6699dSAlexei Starovoitov 2348c4f6699dSAlexei Starovoitov int bpf_probe_unregister(struct bpf_raw_event_map *btp, struct bpf_prog *prog) 2349c4f6699dSAlexei Starovoitov { 2350e16ec340SAlexei Starovoitov return tracepoint_probe_unregister(btp->tp, (void *)btp->bpf_func, prog); 2351c4f6699dSAlexei Starovoitov } 235241bdc4b4SYonghong Song 235341bdc4b4SYonghong Song int bpf_get_perf_event_info(const struct perf_event *event, u32 *prog_id, 235441bdc4b4SYonghong Song u32 *fd_type, const char **buf, 235541bdc4b4SYonghong Song u64 *probe_offset, u64 *probe_addr) 235641bdc4b4SYonghong Song { 235741bdc4b4SYonghong Song bool is_tracepoint, is_syscall_tp; 235841bdc4b4SYonghong Song struct bpf_prog *prog; 235941bdc4b4SYonghong Song int flags, err = 0; 236041bdc4b4SYonghong Song 236141bdc4b4SYonghong Song prog = event->prog; 236241bdc4b4SYonghong Song if (!prog) 236341bdc4b4SYonghong Song return -ENOENT; 236441bdc4b4SYonghong Song 236541bdc4b4SYonghong Song /* not supporting BPF_PROG_TYPE_PERF_EVENT yet */ 236641bdc4b4SYonghong Song if (prog->type == BPF_PROG_TYPE_PERF_EVENT) 236741bdc4b4SYonghong Song return -EOPNOTSUPP; 236841bdc4b4SYonghong Song 236941bdc4b4SYonghong Song *prog_id = prog->aux->id; 237041bdc4b4SYonghong Song flags = event->tp_event->flags; 237141bdc4b4SYonghong Song is_tracepoint = flags & TRACE_EVENT_FL_TRACEPOINT; 237241bdc4b4SYonghong Song is_syscall_tp = is_syscall_trace_event(event->tp_event); 237341bdc4b4SYonghong Song 237441bdc4b4SYonghong Song if (is_tracepoint || is_syscall_tp) { 237541bdc4b4SYonghong Song *buf = is_tracepoint ? event->tp_event->tp->name 237641bdc4b4SYonghong Song : event->tp_event->name; 23771b715e1bSYafang Shao /* We allow NULL pointer for tracepoint */ 23781b715e1bSYafang Shao if (fd_type) 237941bdc4b4SYonghong Song *fd_type = BPF_FD_TYPE_TRACEPOINT; 23801b715e1bSYafang Shao if (probe_offset) 238141bdc4b4SYonghong Song *probe_offset = 0x0; 23821b715e1bSYafang Shao if (probe_addr) 238341bdc4b4SYonghong Song *probe_addr = 0x0; 238441bdc4b4SYonghong Song } else { 238541bdc4b4SYonghong Song /* kprobe/uprobe */ 238641bdc4b4SYonghong Song err = -EOPNOTSUPP; 238741bdc4b4SYonghong Song #ifdef CONFIG_KPROBE_EVENTS 238841bdc4b4SYonghong Song if (flags & TRACE_EVENT_FL_KPROBE) 238941bdc4b4SYonghong Song err = bpf_get_kprobe_info(event, fd_type, buf, 239041bdc4b4SYonghong Song probe_offset, probe_addr, 239141bdc4b4SYonghong Song event->attr.type == PERF_TYPE_TRACEPOINT); 239241bdc4b4SYonghong Song #endif 239341bdc4b4SYonghong Song #ifdef CONFIG_UPROBE_EVENTS 239441bdc4b4SYonghong Song if (flags & TRACE_EVENT_FL_UPROBE) 239541bdc4b4SYonghong Song err = bpf_get_uprobe_info(event, fd_type, buf, 23965125e757SYafang Shao probe_offset, probe_addr, 239741bdc4b4SYonghong Song event->attr.type == PERF_TYPE_TRACEPOINT); 239841bdc4b4SYonghong Song #endif 239941bdc4b4SYonghong Song } 240041bdc4b4SYonghong Song 240141bdc4b4SYonghong Song return err; 240241bdc4b4SYonghong Song } 2403a38d1107SMatt Mullins 24049db1ff0aSYonghong Song static int __init send_signal_irq_work_init(void) 24059db1ff0aSYonghong Song { 24069db1ff0aSYonghong Song int cpu; 24079db1ff0aSYonghong Song struct send_signal_irq_work *work; 24089db1ff0aSYonghong Song 24099db1ff0aSYonghong Song for_each_possible_cpu(cpu) { 24109db1ff0aSYonghong Song work = per_cpu_ptr(&send_signal_work, cpu); 24119db1ff0aSYonghong Song init_irq_work(&work->irq_work, do_bpf_send_signal); 24129db1ff0aSYonghong Song } 24139db1ff0aSYonghong Song return 0; 24149db1ff0aSYonghong Song } 24159db1ff0aSYonghong Song 24169db1ff0aSYonghong Song subsys_initcall(send_signal_irq_work_init); 24179db1ff0aSYonghong Song 2418a38d1107SMatt Mullins #ifdef CONFIG_MODULES 2419390e99cfSStanislav Fomichev static int bpf_event_notify(struct notifier_block *nb, unsigned long op, 2420390e99cfSStanislav Fomichev void *module) 2421a38d1107SMatt Mullins { 2422a38d1107SMatt Mullins struct bpf_trace_module *btm, *tmp; 2423a38d1107SMatt Mullins struct module *mod = module; 24240340a6b7SPeter Zijlstra int ret = 0; 2425a38d1107SMatt Mullins 2426a38d1107SMatt Mullins if (mod->num_bpf_raw_events == 0 || 2427a38d1107SMatt Mullins (op != MODULE_STATE_COMING && op != MODULE_STATE_GOING)) 24280340a6b7SPeter Zijlstra goto out; 2429a38d1107SMatt Mullins 2430a38d1107SMatt Mullins mutex_lock(&bpf_module_mutex); 2431a38d1107SMatt Mullins 2432a38d1107SMatt Mullins switch (op) { 2433a38d1107SMatt Mullins case MODULE_STATE_COMING: 2434a38d1107SMatt Mullins btm = kzalloc(sizeof(*btm), GFP_KERNEL); 2435a38d1107SMatt Mullins if (btm) { 2436a38d1107SMatt Mullins btm->module = module; 2437a38d1107SMatt Mullins list_add(&btm->list, &bpf_trace_modules); 24380340a6b7SPeter Zijlstra } else { 24390340a6b7SPeter Zijlstra ret = -ENOMEM; 2440a38d1107SMatt Mullins } 2441a38d1107SMatt Mullins break; 2442a38d1107SMatt Mullins case MODULE_STATE_GOING: 2443a38d1107SMatt Mullins list_for_each_entry_safe(btm, tmp, &bpf_trace_modules, list) { 2444a38d1107SMatt Mullins if (btm->module == module) { 2445a38d1107SMatt Mullins list_del(&btm->list); 2446a38d1107SMatt Mullins kfree(btm); 2447a38d1107SMatt Mullins break; 2448a38d1107SMatt Mullins } 2449a38d1107SMatt Mullins } 2450a38d1107SMatt Mullins break; 2451a38d1107SMatt Mullins } 2452a38d1107SMatt Mullins 2453a38d1107SMatt Mullins mutex_unlock(&bpf_module_mutex); 2454a38d1107SMatt Mullins 24550340a6b7SPeter Zijlstra out: 24560340a6b7SPeter Zijlstra return notifier_from_errno(ret); 2457a38d1107SMatt Mullins } 2458a38d1107SMatt Mullins 2459a38d1107SMatt Mullins static struct notifier_block bpf_module_nb = { 2460a38d1107SMatt Mullins .notifier_call = bpf_event_notify, 2461a38d1107SMatt Mullins }; 2462a38d1107SMatt Mullins 2463390e99cfSStanislav Fomichev static int __init bpf_event_init(void) 2464a38d1107SMatt Mullins { 2465a38d1107SMatt Mullins register_module_notifier(&bpf_module_nb); 2466a38d1107SMatt Mullins return 0; 2467a38d1107SMatt Mullins } 2468a38d1107SMatt Mullins 2469a38d1107SMatt Mullins fs_initcall(bpf_event_init); 2470a38d1107SMatt Mullins #endif /* CONFIG_MODULES */ 24710dcac272SJiri Olsa 24720dcac272SJiri Olsa #ifdef CONFIG_FPROBE 24730dcac272SJiri Olsa struct bpf_kprobe_multi_link { 24740dcac272SJiri Olsa struct bpf_link link; 24750dcac272SJiri Olsa struct fprobe fp; 24760dcac272SJiri Olsa unsigned long *addrs; 2477ca74823cSJiri Olsa u64 *cookies; 2478ca74823cSJiri Olsa u32 cnt; 2479e22061b2SJiri Olsa u32 mods_cnt; 2480e22061b2SJiri Olsa struct module **mods; 24817ac8d0d2SYafang Shao u32 flags; 24820dcac272SJiri Olsa }; 24830dcac272SJiri Olsa 2484f7098690SJiri Olsa struct bpf_kprobe_multi_run_ctx { 2485f7098690SJiri Olsa struct bpf_run_ctx run_ctx; 2486f7098690SJiri Olsa struct bpf_kprobe_multi_link *link; 2487f7098690SJiri Olsa unsigned long entry_ip; 2488f7098690SJiri Olsa }; 2489f7098690SJiri Olsa 24900236fec5SJiri Olsa struct user_syms { 24910236fec5SJiri Olsa const char **syms; 24920236fec5SJiri Olsa char *buf; 24930236fec5SJiri Olsa }; 24940236fec5SJiri Olsa 24950236fec5SJiri Olsa static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, u32 cnt) 24960236fec5SJiri Olsa { 24970236fec5SJiri Olsa unsigned long __user usymbol; 24980236fec5SJiri Olsa const char **syms = NULL; 24990236fec5SJiri Olsa char *buf = NULL, *p; 25000236fec5SJiri Olsa int err = -ENOMEM; 25010236fec5SJiri Olsa unsigned int i; 25020236fec5SJiri Olsa 2503fd58f7dfSDan Carpenter syms = kvmalloc_array(cnt, sizeof(*syms), GFP_KERNEL); 25040236fec5SJiri Olsa if (!syms) 25050236fec5SJiri Olsa goto error; 25060236fec5SJiri Olsa 2507fd58f7dfSDan Carpenter buf = kvmalloc_array(cnt, KSYM_NAME_LEN, GFP_KERNEL); 25080236fec5SJiri Olsa if (!buf) 25090236fec5SJiri Olsa goto error; 25100236fec5SJiri Olsa 25110236fec5SJiri Olsa for (p = buf, i = 0; i < cnt; i++) { 25120236fec5SJiri Olsa if (__get_user(usymbol, usyms + i)) { 25130236fec5SJiri Olsa err = -EFAULT; 25140236fec5SJiri Olsa goto error; 25150236fec5SJiri Olsa } 25160236fec5SJiri Olsa err = strncpy_from_user(p, (const char __user *) usymbol, KSYM_NAME_LEN); 25170236fec5SJiri Olsa if (err == KSYM_NAME_LEN) 25180236fec5SJiri Olsa err = -E2BIG; 25190236fec5SJiri Olsa if (err < 0) 25200236fec5SJiri Olsa goto error; 25210236fec5SJiri Olsa syms[i] = p; 25220236fec5SJiri Olsa p += err + 1; 25230236fec5SJiri Olsa } 25240236fec5SJiri Olsa 25250236fec5SJiri Olsa us->syms = syms; 25260236fec5SJiri Olsa us->buf = buf; 25270236fec5SJiri Olsa return 0; 25280236fec5SJiri Olsa 25290236fec5SJiri Olsa error: 25300236fec5SJiri Olsa if (err) { 25310236fec5SJiri Olsa kvfree(syms); 25320236fec5SJiri Olsa kvfree(buf); 25330236fec5SJiri Olsa } 25340236fec5SJiri Olsa return err; 25350236fec5SJiri Olsa } 25360236fec5SJiri Olsa 2537e22061b2SJiri Olsa static void kprobe_multi_put_modules(struct module **mods, u32 cnt) 2538e22061b2SJiri Olsa { 2539e22061b2SJiri Olsa u32 i; 2540e22061b2SJiri Olsa 2541e22061b2SJiri Olsa for (i = 0; i < cnt; i++) 2542e22061b2SJiri Olsa module_put(mods[i]); 2543e22061b2SJiri Olsa } 2544e22061b2SJiri Olsa 25450236fec5SJiri Olsa static void free_user_syms(struct user_syms *us) 25460236fec5SJiri Olsa { 25470236fec5SJiri Olsa kvfree(us->syms); 25480236fec5SJiri Olsa kvfree(us->buf); 25490236fec5SJiri Olsa } 25500236fec5SJiri Olsa 25510dcac272SJiri Olsa static void bpf_kprobe_multi_link_release(struct bpf_link *link) 25520dcac272SJiri Olsa { 25530dcac272SJiri Olsa struct bpf_kprobe_multi_link *kmulti_link; 25540dcac272SJiri Olsa 25550dcac272SJiri Olsa kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); 25560dcac272SJiri Olsa unregister_fprobe(&kmulti_link->fp); 2557e22061b2SJiri Olsa kprobe_multi_put_modules(kmulti_link->mods, kmulti_link->mods_cnt); 25580dcac272SJiri Olsa } 25590dcac272SJiri Olsa 25600dcac272SJiri Olsa static void bpf_kprobe_multi_link_dealloc(struct bpf_link *link) 25610dcac272SJiri Olsa { 25620dcac272SJiri Olsa struct bpf_kprobe_multi_link *kmulti_link; 25630dcac272SJiri Olsa 25640dcac272SJiri Olsa kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); 25650dcac272SJiri Olsa kvfree(kmulti_link->addrs); 2566ca74823cSJiri Olsa kvfree(kmulti_link->cookies); 2567e22061b2SJiri Olsa kfree(kmulti_link->mods); 25680dcac272SJiri Olsa kfree(kmulti_link); 25690dcac272SJiri Olsa } 25700dcac272SJiri Olsa 25717ac8d0d2SYafang Shao static int bpf_kprobe_multi_link_fill_link_info(const struct bpf_link *link, 25727ac8d0d2SYafang Shao struct bpf_link_info *info) 25737ac8d0d2SYafang Shao { 25747ac8d0d2SYafang Shao u64 __user *uaddrs = u64_to_user_ptr(info->kprobe_multi.addrs); 25757ac8d0d2SYafang Shao struct bpf_kprobe_multi_link *kmulti_link; 25767ac8d0d2SYafang Shao u32 ucount = info->kprobe_multi.count; 25777ac8d0d2SYafang Shao int err = 0, i; 25787ac8d0d2SYafang Shao 25797ac8d0d2SYafang Shao if (!uaddrs ^ !ucount) 25807ac8d0d2SYafang Shao return -EINVAL; 25817ac8d0d2SYafang Shao 25827ac8d0d2SYafang Shao kmulti_link = container_of(link, struct bpf_kprobe_multi_link, link); 25837ac8d0d2SYafang Shao info->kprobe_multi.count = kmulti_link->cnt; 25847ac8d0d2SYafang Shao info->kprobe_multi.flags = kmulti_link->flags; 25857ac8d0d2SYafang Shao 25867ac8d0d2SYafang Shao if (!uaddrs) 25877ac8d0d2SYafang Shao return 0; 25887ac8d0d2SYafang Shao if (ucount < kmulti_link->cnt) 25897ac8d0d2SYafang Shao err = -ENOSPC; 25907ac8d0d2SYafang Shao else 25917ac8d0d2SYafang Shao ucount = kmulti_link->cnt; 25927ac8d0d2SYafang Shao 25937ac8d0d2SYafang Shao if (kallsyms_show_value(current_cred())) { 25947ac8d0d2SYafang Shao if (copy_to_user(uaddrs, kmulti_link->addrs, ucount * sizeof(u64))) 25957ac8d0d2SYafang Shao return -EFAULT; 25967ac8d0d2SYafang Shao } else { 25977ac8d0d2SYafang Shao for (i = 0; i < ucount; i++) { 25987ac8d0d2SYafang Shao if (put_user(0, uaddrs + i)) 25997ac8d0d2SYafang Shao return -EFAULT; 26007ac8d0d2SYafang Shao } 26017ac8d0d2SYafang Shao } 26027ac8d0d2SYafang Shao return err; 26037ac8d0d2SYafang Shao } 26047ac8d0d2SYafang Shao 26050dcac272SJiri Olsa static const struct bpf_link_ops bpf_kprobe_multi_link_lops = { 26060dcac272SJiri Olsa .release = bpf_kprobe_multi_link_release, 26070dcac272SJiri Olsa .dealloc = bpf_kprobe_multi_link_dealloc, 26087ac8d0d2SYafang Shao .fill_link_info = bpf_kprobe_multi_link_fill_link_info, 26090dcac272SJiri Olsa }; 26100dcac272SJiri Olsa 2611ca74823cSJiri Olsa static void bpf_kprobe_multi_cookie_swap(void *a, void *b, int size, const void *priv) 2612ca74823cSJiri Olsa { 2613ca74823cSJiri Olsa const struct bpf_kprobe_multi_link *link = priv; 2614ca74823cSJiri Olsa unsigned long *addr_a = a, *addr_b = b; 2615ca74823cSJiri Olsa u64 *cookie_a, *cookie_b; 2616ca74823cSJiri Olsa 2617ca74823cSJiri Olsa cookie_a = link->cookies + (addr_a - link->addrs); 2618ca74823cSJiri Olsa cookie_b = link->cookies + (addr_b - link->addrs); 2619ca74823cSJiri Olsa 2620ca74823cSJiri Olsa /* swap addr_a/addr_b and cookie_a/cookie_b values */ 262111e17ae4SJiapeng Chong swap(*addr_a, *addr_b); 262211e17ae4SJiapeng Chong swap(*cookie_a, *cookie_b); 2623ca74823cSJiri Olsa } 2624ca74823cSJiri Olsa 26251a1b0716SJiri Olsa static int bpf_kprobe_multi_addrs_cmp(const void *a, const void *b) 2626ca74823cSJiri Olsa { 2627ca74823cSJiri Olsa const unsigned long *addr_a = a, *addr_b = b; 2628ca74823cSJiri Olsa 2629ca74823cSJiri Olsa if (*addr_a == *addr_b) 2630ca74823cSJiri Olsa return 0; 2631ca74823cSJiri Olsa return *addr_a < *addr_b ? -1 : 1; 2632ca74823cSJiri Olsa } 2633ca74823cSJiri Olsa 2634ca74823cSJiri Olsa static int bpf_kprobe_multi_cookie_cmp(const void *a, const void *b, const void *priv) 2635ca74823cSJiri Olsa { 26361a1b0716SJiri Olsa return bpf_kprobe_multi_addrs_cmp(a, b); 2637ca74823cSJiri Olsa } 2638ca74823cSJiri Olsa 2639f7098690SJiri Olsa static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) 2640ca74823cSJiri Olsa { 2641f7098690SJiri Olsa struct bpf_kprobe_multi_run_ctx *run_ctx; 2642ca74823cSJiri Olsa struct bpf_kprobe_multi_link *link; 2643f7098690SJiri Olsa u64 *cookie, entry_ip; 2644ca74823cSJiri Olsa unsigned long *addr; 2645ca74823cSJiri Olsa 2646ca74823cSJiri Olsa if (WARN_ON_ONCE(!ctx)) 2647ca74823cSJiri Olsa return 0; 2648f7098690SJiri Olsa run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, run_ctx); 2649f7098690SJiri Olsa link = run_ctx->link; 2650ca74823cSJiri Olsa if (!link->cookies) 2651ca74823cSJiri Olsa return 0; 2652f7098690SJiri Olsa entry_ip = run_ctx->entry_ip; 2653f7098690SJiri Olsa addr = bsearch(&entry_ip, link->addrs, link->cnt, sizeof(entry_ip), 26541a1b0716SJiri Olsa bpf_kprobe_multi_addrs_cmp); 2655ca74823cSJiri Olsa if (!addr) 2656ca74823cSJiri Olsa return 0; 2657ca74823cSJiri Olsa cookie = link->cookies + (addr - link->addrs); 2658ca74823cSJiri Olsa return *cookie; 2659ca74823cSJiri Olsa } 2660ca74823cSJiri Olsa 2661f7098690SJiri Olsa static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) 2662f7098690SJiri Olsa { 2663f7098690SJiri Olsa struct bpf_kprobe_multi_run_ctx *run_ctx; 2664f7098690SJiri Olsa 2665f7098690SJiri Olsa run_ctx = container_of(current->bpf_ctx, struct bpf_kprobe_multi_run_ctx, run_ctx); 2666f7098690SJiri Olsa return run_ctx->entry_ip; 2667f7098690SJiri Olsa } 2668f7098690SJiri Olsa 26690dcac272SJiri Olsa static int 26700dcac272SJiri Olsa kprobe_multi_link_prog_run(struct bpf_kprobe_multi_link *link, 2671f7098690SJiri Olsa unsigned long entry_ip, struct pt_regs *regs) 26720dcac272SJiri Olsa { 2673f7098690SJiri Olsa struct bpf_kprobe_multi_run_ctx run_ctx = { 2674f7098690SJiri Olsa .link = link, 2675f7098690SJiri Olsa .entry_ip = entry_ip, 2676f7098690SJiri Olsa }; 2677ca74823cSJiri Olsa struct bpf_run_ctx *old_run_ctx; 26780dcac272SJiri Olsa int err; 26790dcac272SJiri Olsa 26800dcac272SJiri Olsa if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) { 26810dcac272SJiri Olsa err = 0; 26820dcac272SJiri Olsa goto out; 26830dcac272SJiri Olsa } 26840dcac272SJiri Olsa 26850dcac272SJiri Olsa migrate_disable(); 26860dcac272SJiri Olsa rcu_read_lock(); 2687f7098690SJiri Olsa old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx); 26880dcac272SJiri Olsa err = bpf_prog_run(link->link.prog, regs); 2689ca74823cSJiri Olsa bpf_reset_run_ctx(old_run_ctx); 26900dcac272SJiri Olsa rcu_read_unlock(); 26910dcac272SJiri Olsa migrate_enable(); 26920dcac272SJiri Olsa 26930dcac272SJiri Olsa out: 26940dcac272SJiri Olsa __this_cpu_dec(bpf_prog_active); 26950dcac272SJiri Olsa return err; 26960dcac272SJiri Olsa } 26970dcac272SJiri Olsa 269839d95420SMasami Hiramatsu (Google) static int 2699c09eb2e5SJiri Olsa kprobe_multi_link_handler(struct fprobe *fp, unsigned long fentry_ip, 2700cb16330dSMasami Hiramatsu (Google) unsigned long ret_ip, struct pt_regs *regs, 2701cb16330dSMasami Hiramatsu (Google) void *data) 27020dcac272SJiri Olsa { 27030dcac272SJiri Olsa struct bpf_kprobe_multi_link *link; 27040dcac272SJiri Olsa 27050dcac272SJiri Olsa link = container_of(fp, struct bpf_kprobe_multi_link, fp); 2706c09eb2e5SJiri Olsa kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs); 270739d95420SMasami Hiramatsu (Google) return 0; 270839d95420SMasami Hiramatsu (Google) } 270939d95420SMasami Hiramatsu (Google) 271039d95420SMasami Hiramatsu (Google) static void 271139d95420SMasami Hiramatsu (Google) kprobe_multi_link_exit_handler(struct fprobe *fp, unsigned long fentry_ip, 2712cb16330dSMasami Hiramatsu (Google) unsigned long ret_ip, struct pt_regs *regs, 2713cb16330dSMasami Hiramatsu (Google) void *data) 2714eb5fb032SJiri Olsa { 2715eb5fb032SJiri Olsa struct bpf_kprobe_multi_link *link; 2716eb5fb032SJiri Olsa 2717eb5fb032SJiri Olsa link = container_of(fp, struct bpf_kprobe_multi_link, fp); 2718eb5fb032SJiri Olsa kprobe_multi_link_prog_run(link, get_entry_ip(fentry_ip), regs); 2719eb5fb032SJiri Olsa } 2720eb5fb032SJiri Olsa 2721eb5fb032SJiri Olsa static int symbols_cmp_r(const void *a, const void *b, const void *priv) 2722eb5fb032SJiri Olsa { 2723eb5fb032SJiri Olsa const char **str_a = (const char **) a; 2724eb5fb032SJiri Olsa const char **str_b = (const char **) b; 2725eb5fb032SJiri Olsa 2726eb5fb032SJiri Olsa return strcmp(*str_a, *str_b); 2727eb5fb032SJiri Olsa } 2728eb5fb032SJiri Olsa 2729eb5fb032SJiri Olsa struct multi_symbols_sort { 2730eb5fb032SJiri Olsa const char **funcs; 2731eb5fb032SJiri Olsa u64 *cookies; 2732eb5fb032SJiri Olsa }; 2733eb5fb032SJiri Olsa 2734eb5fb032SJiri Olsa static void symbols_swap_r(void *a, void *b, int size, const void *priv) 27350dcac272SJiri Olsa { 27360dcac272SJiri Olsa const struct multi_symbols_sort *data = priv; 27370dcac272SJiri Olsa const char **name_a = a, **name_b = b; 27380dcac272SJiri Olsa 2739ca74823cSJiri Olsa swap(*name_a, *name_b); 27400dcac272SJiri Olsa 27410dcac272SJiri Olsa /* If defined, swap also related cookies. */ 27420dcac272SJiri Olsa if (data->cookies) { 2743ca74823cSJiri Olsa u64 *cookie_a, *cookie_b; 27440dcac272SJiri Olsa 27450dcac272SJiri Olsa cookie_a = data->cookies + (name_a - data->funcs); 27460dcac272SJiri Olsa cookie_b = data->cookies + (name_b - data->funcs); 27470dcac272SJiri Olsa swap(*cookie_a, *cookie_b); 27480dcac272SJiri Olsa } 27490dcac272SJiri Olsa } 27500dcac272SJiri Olsa 27516a5f2d6eSJiri Olsa struct modules_array { 2752e22061b2SJiri Olsa struct module **mods; 2753e22061b2SJiri Olsa int mods_cnt; 2754e22061b2SJiri Olsa int mods_cap; 2755e22061b2SJiri Olsa }; 2756e22061b2SJiri Olsa 27576a5f2d6eSJiri Olsa static int add_module(struct modules_array *arr, struct module *mod) 2758e22061b2SJiri Olsa { 2759e22061b2SJiri Olsa struct module **mods; 2760e22061b2SJiri Olsa 27616a5f2d6eSJiri Olsa if (arr->mods_cnt == arr->mods_cap) { 27626a5f2d6eSJiri Olsa arr->mods_cap = max(16, arr->mods_cap * 3 / 2); 27636a5f2d6eSJiri Olsa mods = krealloc_array(arr->mods, arr->mods_cap, sizeof(*mods), GFP_KERNEL); 2764e22061b2SJiri Olsa if (!mods) 2765e22061b2SJiri Olsa return -ENOMEM; 27666a5f2d6eSJiri Olsa arr->mods = mods; 2767e22061b2SJiri Olsa } 2768e22061b2SJiri Olsa 27696a5f2d6eSJiri Olsa arr->mods[arr->mods_cnt] = mod; 27706a5f2d6eSJiri Olsa arr->mods_cnt++; 2771e22061b2SJiri Olsa return 0; 2772e22061b2SJiri Olsa } 2773e22061b2SJiri Olsa 27746a5f2d6eSJiri Olsa static bool has_module(struct modules_array *arr, struct module *mod) 27756a5f2d6eSJiri Olsa { 27766a5f2d6eSJiri Olsa int i; 27776a5f2d6eSJiri Olsa 27786a5f2d6eSJiri Olsa for (i = arr->mods_cnt - 1; i >= 0; i--) { 27796a5f2d6eSJiri Olsa if (arr->mods[i] == mod) 27806a5f2d6eSJiri Olsa return true; 27816a5f2d6eSJiri Olsa } 27826a5f2d6eSJiri Olsa return false; 27836a5f2d6eSJiri Olsa } 27846a5f2d6eSJiri Olsa 2785e22061b2SJiri Olsa static int get_modules_for_addrs(struct module ***mods, unsigned long *addrs, u32 addrs_cnt) 2786e22061b2SJiri Olsa { 27876a5f2d6eSJiri Olsa struct modules_array arr = {}; 27886a5f2d6eSJiri Olsa u32 i, err = 0; 27896a5f2d6eSJiri Olsa 27906a5f2d6eSJiri Olsa for (i = 0; i < addrs_cnt; i++) { 27916a5f2d6eSJiri Olsa struct module *mod; 27926a5f2d6eSJiri Olsa 27936a5f2d6eSJiri Olsa preempt_disable(); 27946a5f2d6eSJiri Olsa mod = __module_address(addrs[i]); 27956a5f2d6eSJiri Olsa /* Either no module or we it's already stored */ 27966a5f2d6eSJiri Olsa if (!mod || has_module(&arr, mod)) { 27976a5f2d6eSJiri Olsa preempt_enable(); 27986a5f2d6eSJiri Olsa continue; 27996a5f2d6eSJiri Olsa } 28006a5f2d6eSJiri Olsa if (!try_module_get(mod)) 28016a5f2d6eSJiri Olsa err = -EINVAL; 28026a5f2d6eSJiri Olsa preempt_enable(); 28036a5f2d6eSJiri Olsa if (err) 28046a5f2d6eSJiri Olsa break; 28056a5f2d6eSJiri Olsa err = add_module(&arr, mod); 28066a5f2d6eSJiri Olsa if (err) { 28076a5f2d6eSJiri Olsa module_put(mod); 28086a5f2d6eSJiri Olsa break; 28096a5f2d6eSJiri Olsa } 28106a5f2d6eSJiri Olsa } 2811e22061b2SJiri Olsa 2812e22061b2SJiri Olsa /* We return either err < 0 in case of error, ... */ 2813e22061b2SJiri Olsa if (err) { 28146a5f2d6eSJiri Olsa kprobe_multi_put_modules(arr.mods, arr.mods_cnt); 28156a5f2d6eSJiri Olsa kfree(arr.mods); 2816e22061b2SJiri Olsa return err; 2817e22061b2SJiri Olsa } 2818e22061b2SJiri Olsa 2819e22061b2SJiri Olsa /* or number of modules found if everything is ok. */ 28206a5f2d6eSJiri Olsa *mods = arr.mods; 28216a5f2d6eSJiri Olsa return arr.mods_cnt; 2822e22061b2SJiri Olsa } 2823e22061b2SJiri Olsa 28240dcac272SJiri Olsa int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) 28250dcac272SJiri Olsa { 28260dcac272SJiri Olsa struct bpf_kprobe_multi_link *link = NULL; 28270dcac272SJiri Olsa struct bpf_link_primer link_primer; 28280dcac272SJiri Olsa void __user *ucookies; 28290dcac272SJiri Olsa unsigned long *addrs; 28300dcac272SJiri Olsa u32 flags, cnt, size; 28310dcac272SJiri Olsa void __user *uaddrs; 28320dcac272SJiri Olsa u64 *cookies = NULL; 28330dcac272SJiri Olsa void __user *usyms; 28340dcac272SJiri Olsa int err; 28350dcac272SJiri Olsa 28360dcac272SJiri Olsa /* no support for 32bit archs yet */ 28370dcac272SJiri Olsa if (sizeof(u64) != sizeof(void *)) 28380dcac272SJiri Olsa return -EOPNOTSUPP; 28390dcac272SJiri Olsa 28400dcac272SJiri Olsa if (prog->expected_attach_type != BPF_TRACE_KPROBE_MULTI) 28410dcac272SJiri Olsa return -EINVAL; 28420dcac272SJiri Olsa 28430dcac272SJiri Olsa flags = attr->link_create.kprobe_multi.flags; 28440dcac272SJiri Olsa if (flags & ~BPF_F_KPROBE_MULTI_RETURN) 28450dcac272SJiri Olsa return -EINVAL; 28460dcac272SJiri Olsa 28470dcac272SJiri Olsa uaddrs = u64_to_user_ptr(attr->link_create.kprobe_multi.addrs); 28480dcac272SJiri Olsa usyms = u64_to_user_ptr(attr->link_create.kprobe_multi.syms); 28490dcac272SJiri Olsa if (!!uaddrs == !!usyms) 28500dcac272SJiri Olsa return -EINVAL; 28510dcac272SJiri Olsa 28520dcac272SJiri Olsa cnt = attr->link_create.kprobe_multi.cnt; 28530dcac272SJiri Olsa if (!cnt) 28540dcac272SJiri Olsa return -EINVAL; 28550dcac272SJiri Olsa 28560dcac272SJiri Olsa size = cnt * sizeof(*addrs); 2857fd58f7dfSDan Carpenter addrs = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); 28580dcac272SJiri Olsa if (!addrs) 28590dcac272SJiri Olsa return -ENOMEM; 28600dcac272SJiri Olsa 2861ca74823cSJiri Olsa ucookies = u64_to_user_ptr(attr->link_create.kprobe_multi.cookies); 2862ca74823cSJiri Olsa if (ucookies) { 2863fd58f7dfSDan Carpenter cookies = kvmalloc_array(cnt, sizeof(*addrs), GFP_KERNEL); 2864ca74823cSJiri Olsa if (!cookies) { 2865ca74823cSJiri Olsa err = -ENOMEM; 2866ca74823cSJiri Olsa goto error; 2867ca74823cSJiri Olsa } 2868ca74823cSJiri Olsa if (copy_from_user(cookies, ucookies, size)) { 2869ca74823cSJiri Olsa err = -EFAULT; 2870ca74823cSJiri Olsa goto error; 2871ca74823cSJiri Olsa } 2872ca74823cSJiri Olsa } 2873ca74823cSJiri Olsa 2874eb5fb032SJiri Olsa if (uaddrs) { 2875eb5fb032SJiri Olsa if (copy_from_user(addrs, uaddrs, size)) { 2876eb5fb032SJiri Olsa err = -EFAULT; 2877eb5fb032SJiri Olsa goto error; 2878eb5fb032SJiri Olsa } 2879eb5fb032SJiri Olsa } else { 2880eb5fb032SJiri Olsa struct multi_symbols_sort data = { 2881eb5fb032SJiri Olsa .cookies = cookies, 2882eb5fb032SJiri Olsa }; 2883eb5fb032SJiri Olsa struct user_syms us; 2884eb5fb032SJiri Olsa 2885eb5fb032SJiri Olsa err = copy_user_syms(&us, usyms, cnt); 2886eb5fb032SJiri Olsa if (err) 2887eb5fb032SJiri Olsa goto error; 2888eb5fb032SJiri Olsa 2889eb5fb032SJiri Olsa if (cookies) 2890eb5fb032SJiri Olsa data.funcs = us.syms; 2891eb5fb032SJiri Olsa 2892eb5fb032SJiri Olsa sort_r(us.syms, cnt, sizeof(*us.syms), symbols_cmp_r, 2893eb5fb032SJiri Olsa symbols_swap_r, &data); 2894eb5fb032SJiri Olsa 2895eb5fb032SJiri Olsa err = ftrace_lookup_symbols(us.syms, cnt, addrs); 2896eb5fb032SJiri Olsa free_user_syms(&us); 2897eb5fb032SJiri Olsa if (err) 2898eb5fb032SJiri Olsa goto error; 2899eb5fb032SJiri Olsa } 2900eb5fb032SJiri Olsa 29010dcac272SJiri Olsa link = kzalloc(sizeof(*link), GFP_KERNEL); 29020dcac272SJiri Olsa if (!link) { 29030dcac272SJiri Olsa err = -ENOMEM; 29040dcac272SJiri Olsa goto error; 29050dcac272SJiri Olsa } 29060dcac272SJiri Olsa 29070dcac272SJiri Olsa bpf_link_init(&link->link, BPF_LINK_TYPE_KPROBE_MULTI, 29080dcac272SJiri Olsa &bpf_kprobe_multi_link_lops, prog); 29090dcac272SJiri Olsa 29100dcac272SJiri Olsa err = bpf_link_prime(&link->link, &link_primer); 29110dcac272SJiri Olsa if (err) 29120dcac272SJiri Olsa goto error; 29130dcac272SJiri Olsa 29140dcac272SJiri Olsa if (flags & BPF_F_KPROBE_MULTI_RETURN) 291539d95420SMasami Hiramatsu (Google) link->fp.exit_handler = kprobe_multi_link_exit_handler; 29160dcac272SJiri Olsa else 29170dcac272SJiri Olsa link->fp.entry_handler = kprobe_multi_link_handler; 29180dcac272SJiri Olsa 29190dcac272SJiri Olsa link->addrs = addrs; 2920ca74823cSJiri Olsa link->cookies = cookies; 2921ca74823cSJiri Olsa link->cnt = cnt; 29227ac8d0d2SYafang Shao link->flags = flags; 2923ca74823cSJiri Olsa 2924ca74823cSJiri Olsa if (cookies) { 2925ca74823cSJiri Olsa /* 2926ca74823cSJiri Olsa * Sorting addresses will trigger sorting cookies as well 2927ca74823cSJiri Olsa * (check bpf_kprobe_multi_cookie_swap). This way we can 2928ca74823cSJiri Olsa * find cookie based on the address in bpf_get_attach_cookie 2929ca74823cSJiri Olsa * helper. 2930ca74823cSJiri Olsa */ 2931ca74823cSJiri Olsa sort_r(addrs, cnt, sizeof(*addrs), 2932ca74823cSJiri Olsa bpf_kprobe_multi_cookie_cmp, 2933ca74823cSJiri Olsa bpf_kprobe_multi_cookie_swap, 2934ca74823cSJiri Olsa link); 2935ca74823cSJiri Olsa } 29360dcac272SJiri Olsa 2937e22061b2SJiri Olsa err = get_modules_for_addrs(&link->mods, addrs, cnt); 2938e22061b2SJiri Olsa if (err < 0) { 2939e22061b2SJiri Olsa bpf_link_cleanup(&link_primer); 2940e22061b2SJiri Olsa return err; 2941e22061b2SJiri Olsa } 2942e22061b2SJiri Olsa link->mods_cnt = err; 2943e22061b2SJiri Olsa 29440dcac272SJiri Olsa err = register_fprobe_ips(&link->fp, addrs, cnt); 29450dcac272SJiri Olsa if (err) { 2946e22061b2SJiri Olsa kprobe_multi_put_modules(link->mods, link->mods_cnt); 29470dcac272SJiri Olsa bpf_link_cleanup(&link_primer); 29480dcac272SJiri Olsa return err; 29490dcac272SJiri Olsa } 29500dcac272SJiri Olsa 29510dcac272SJiri Olsa return bpf_link_settle(&link_primer); 29520dcac272SJiri Olsa 29530dcac272SJiri Olsa error: 29540dcac272SJiri Olsa kfree(link); 29550dcac272SJiri Olsa kvfree(addrs); 2956ca74823cSJiri Olsa kvfree(cookies); 29570dcac272SJiri Olsa return err; 29580dcac272SJiri Olsa } 29590dcac272SJiri Olsa #else /* !CONFIG_FPROBE */ 29600dcac272SJiri Olsa int bpf_kprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *prog) 29610dcac272SJiri Olsa { 29620dcac272SJiri Olsa return -EOPNOTSUPP; 29630dcac272SJiri Olsa } 2964f7098690SJiri Olsa static u64 bpf_kprobe_multi_cookie(struct bpf_run_ctx *ctx) 2965f7098690SJiri Olsa { 2966f7098690SJiri Olsa return 0; 2967f7098690SJiri Olsa } 2968f7098690SJiri Olsa static u64 bpf_kprobe_multi_entry_ip(struct bpf_run_ctx *ctx) 2969ca74823cSJiri Olsa { 2970ca74823cSJiri Olsa return 0; 2971ca74823cSJiri Olsa } 29720dcac272SJiri Olsa #endif 2973