tools/testing/selftests/bpf/progs/find_vma_fail2.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2021 Facebook */
   3 #include "vmlinux.h"
   4 #include <bpf/bpf_helpers.h>
   5
   6 char _license[] SEC("license") = "GPL";
   7
   8 struct callback_ctx {
   9         int dummy;
  10 };
  11
  12 static long write_task(struct task_struct *task, struct vm_area_struct *vma,
  13                        struct callback_ctx *data)
  14 {
  15         /* writing to task, which is illegal */
  16         task->mm = NULL;
  17
  18         return 0;
  19 }
  20
  21 SEC("raw_tp/sys_enter")
  22 int handle_getpid(void)
  23 {
  24         struct task_struct *task = bpf_get_current_task_btf();
  25         struct callback_ctx data = {};
  26
  27         bpf_find_vma(task, 0, write_task, &data, 0);
  28         return 0;
  29 }