1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ 3 4 #include "vmlinux.h" 5 #include <bpf/bpf_helpers.h> 6 7 char _license[] SEC("license") = "GPL"; 8 9 /* rodata section */ 10 const volatile pid_t pid; 11 const volatile size_t bss_array_len; 12 const volatile size_t data_array_len; 13 14 /* bss section */ 15 int sum = 0; 16 int array[1]; 17 18 /* custom data secton */ 19 int my_array[1] SEC(".data.custom"); 20 21 /* custom data section which should NOT be resizable, 22 * since it contains a single var which is not an array 23 */ 24 int my_int SEC(".data.non_array"); 25 26 /* custom data section which should NOT be resizable, 27 * since its last var is not an array 28 */ 29 int my_array_first[1] SEC(".data.array_not_last"); 30 int my_int_last SEC(".data.array_not_last"); 31 32 int percpu_arr[1] SEC(".data.percpu_arr"); 33 34 SEC("tp/syscalls/sys_enter_getpid") bss_array_sum(void * ctx)35int bss_array_sum(void *ctx) 36 { 37 if (pid != (bpf_get_current_pid_tgid() >> 32)) 38 return 0; 39 40 /* this will be zero, we just rely on verifier not rejecting this */ 41 sum = percpu_arr[bpf_get_smp_processor_id()]; 42 43 for (size_t i = 0; i < bss_array_len; ++i) 44 sum += array[i]; 45 46 return 0; 47 } 48 49 SEC("tp/syscalls/sys_enter_getuid") data_array_sum(void * ctx)50int data_array_sum(void *ctx) 51 { 52 if (pid != (bpf_get_current_pid_tgid() >> 32)) 53 return 0; 54 55 /* this will be zero, we just rely on verifier not rejecting this */ 56 sum = percpu_arr[bpf_get_smp_processor_id()]; 57 58 for (size_t i = 0; i < data_array_len; ++i) 59 sum += my_array[i]; 60 61 return 0; 62 } 63