| // SPDX-License-Identifier: GPL-2.0 |
| /* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */ |
| |
| #include "vmlinux.h" |
| #include <bpf/bpf_helpers.h> |
| |
| char _license[] SEC("license") = "GPL"; |
| |
| /* rodata section */ |
| const volatile pid_t pid; |
| const volatile size_t bss_array_len; |
| const volatile size_t data_array_len; |
| |
| /* bss section */ |
| int sum = 0; |
| int array[1]; |
| |
| /* custom data secton */ |
| int my_array[1] SEC(".data.custom"); |
| |
| /* custom data section which should NOT be resizable, |
| * since it contains a single var which is not an array |
| */ |
| int my_int SEC(".data.non_array"); |
| |
| /* custom data section which should NOT be resizable, |
| * since its last var is not an array |
| */ |
| int my_array_first[1] SEC(".data.array_not_last"); |
| int my_int_last SEC(".data.array_not_last"); |
| |
| int percpu_arr[1] SEC(".data.percpu_arr"); |
| |
| SEC("tp/syscalls/sys_enter_getpid") |
| int bss_array_sum(void *ctx) |
| { |
| if (pid != (bpf_get_current_pid_tgid() >> 32)) |
| return 0; |
| |
| /* this will be zero, we just rely on verifier not rejecting this */ |
| sum = percpu_arr[bpf_get_smp_processor_id()]; |
| |
| for (size_t i = 0; i < bss_array_len; ++i) |
| sum += array[i]; |
| |
| return 0; |
| } |
| |
| SEC("tp/syscalls/sys_enter_getuid") |
| int data_array_sum(void *ctx) |
| { |
| if (pid != (bpf_get_current_pid_tgid() >> 32)) |
| return 0; |
| |
| /* this will be zero, we just rely on verifier not rejecting this */ |
| sum = percpu_arr[bpf_get_smp_processor_id()]; |
| |
| for (size_t i = 0; i < data_array_len; ++i) |
| sum += my_array[i]; |
| |
| return 0; |
| } |