5c138a8a4a
Incorporate a test case to assess the handling of invalid flags or task__nullable parameters passed to bpf_iter_task_new(). Prior to the preceding commit, this scenario could potentially trigger a kernel panic. However, with the previous commit, this test case is expected to function correctly. Signed-off-by: Yafang Shao <laoar.shao@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20240217114152.1623-3-laoar.shao@gmail.com
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */
|
|
|
|
#include "vmlinux.h"
|
|
#include <bpf/bpf_helpers.h>
|
|
#include <bpf/bpf_tracing.h>
|
|
#include "bpf_misc.h"
|
|
#include "bpf_experimental.h"
|
|
|
|
char _license[] SEC("license") = "GPL";
|
|
|
|
pid_t target_pid;
|
|
int procs_cnt, threads_cnt, proc_threads_cnt, invalid_cnt;
|
|
|
|
void bpf_rcu_read_lock(void) __ksym;
|
|
void bpf_rcu_read_unlock(void) __ksym;
|
|
|
|
SEC("fentry.s/" SYS_PREFIX "sys_getpgid")
|
|
int iter_task_for_each_sleep(void *ctx)
|
|
{
|
|
struct task_struct *cur_task = bpf_get_current_task_btf();
|
|
struct task_struct *pos;
|
|
|
|
if (cur_task->pid != target_pid)
|
|
return 0;
|
|
procs_cnt = threads_cnt = proc_threads_cnt = 0;
|
|
|
|
bpf_rcu_read_lock();
|
|
bpf_for_each(task, pos, NULL, ~0U) {
|
|
/* Below instructions shouldn't be executed for invalid flags */
|
|
invalid_cnt++;
|
|
}
|
|
|
|
bpf_for_each(task, pos, NULL, BPF_TASK_ITER_PROC_THREADS) {
|
|
/* Below instructions shouldn't be executed for invalid task__nullable */
|
|
invalid_cnt++;
|
|
}
|
|
|
|
bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_PROCS)
|
|
if (pos->pid == target_pid)
|
|
procs_cnt++;
|
|
|
|
bpf_for_each(task, pos, cur_task, BPF_TASK_ITER_PROC_THREADS)
|
|
proc_threads_cnt++;
|
|
|
|
bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_THREADS)
|
|
if (pos->tgid == target_pid)
|
|
threads_cnt++;
|
|
bpf_rcu_read_unlock();
|
|
return 0;
|
|
}
|