// 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; }