1# SPDX-License-Identifier: GPL-2.0-only 2 3# BPF interpreter that, for example, classic socket filters depend on. 4config BPF 5 bool 6 7# Used by archs to tell that they support BPF JIT compiler plus which 8# flavour. Only one of the two can be selected for a specific arch since 9# eBPF JIT supersedes the cBPF JIT. 10 11# Classic BPF JIT (cBPF) 12config HAVE_CBPF_JIT 13 bool 14 15# Extended BPF JIT (eBPF) 16config HAVE_EBPF_JIT 17 bool 18 19# Used by archs to tell that they want the BPF JIT compiler enabled by 20# default for kernels that were compiled with BPF JIT support. 21config ARCH_WANT_DEFAULT_BPF_JIT 22 bool 23 24menu "BPF subsystem" 25 26config BPF_SYSCALL 27 bool "Enable bpf() system call" 28 select BPF 29 select IRQ_WORK 30 select TASKS_TRACE_RCU 31 select BINARY_PRINTF 32 select NET_SOCK_MSG if NET 33 default n 34 help 35 Enable the bpf() system call that allows to manipulate BPF programs 36 and maps via file descriptors. 37 38config BPF_JIT 39 bool "Enable BPF Just In Time compiler" 40 depends on BPF 41 depends on HAVE_CBPF_JIT || HAVE_EBPF_JIT 42 depends on MODULES 43 help 44 BPF programs are normally handled by a BPF interpreter. This option 45 allows the kernel to generate native code when a program is loaded 46 into the kernel. This will significantly speed-up processing of BPF 47 programs. 48 49 Note, an admin should enable this feature changing: 50 /proc/sys/net/core/bpf_jit_enable 51 /proc/sys/net/core/bpf_jit_harden (optional) 52 /proc/sys/net/core/bpf_jit_kallsyms (optional) 53 54config BPF_JIT_ALWAYS_ON 55 bool "Permanently enable BPF JIT and remove BPF interpreter" 56 depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT 57 help 58 Enables BPF JIT and removes BPF interpreter to avoid speculative 59 execution of BPF instructions by the interpreter. 60 61 When CONFIG_BPF_JIT_ALWAYS_ON is enabled, /proc/sys/net/core/bpf_jit_enable 62 is permanently set to 1 and setting any other value than that will 63 return failure. 64 65config BPF_JIT_DEFAULT_ON 66 def_bool ARCH_WANT_DEFAULT_BPF_JIT || BPF_JIT_ALWAYS_ON 67 depends on HAVE_EBPF_JIT && BPF_JIT 68 69config BPF_UNPRIV_DEFAULT_OFF 70 bool "Disable unprivileged BPF by default" 71 default y 72 depends on BPF_SYSCALL 73 help 74 Disables unprivileged BPF by default by setting the corresponding 75 /proc/sys/kernel/unprivileged_bpf_disabled knob to 2. An admin can 76 still reenable it by setting it to 0 later on, or permanently 77 disable it by setting it to 1 (from which no other transition to 78 0 is possible anymore). 79 80 Unprivileged BPF could be used to exploit certain potential 81 speculative execution side-channel vulnerabilities on unmitigated 82 affected hardware. 83 84 If you are unsure how to answer this question, answer Y. 85 86source "kernel/bpf/preload/Kconfig" 87 88config BPF_LSM 89 bool "Enable BPF LSM Instrumentation" 90 depends on BPF_EVENTS 91 depends on BPF_SYSCALL 92 depends on SECURITY 93 depends on BPF_JIT 94 help 95 Enables instrumentation of the security hooks with BPF programs for 96 implementing dynamic MAC and Audit Policies. 97 98 If you are unsure how to answer this question, answer N. 99 100endmenu # "BPF subsystem" 101