tools/testing/selftests/bpf/progs/find_vma_fail1.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2021 Facebook */
   3 #include "vmlinux.h"
   4 #include <bpf/bpf_helpers.h>
   5 #define vm_flags vm_start
   6
   7 char _license[] SEC("license") = "GPL";
   8
   9 struct callback_ctx {
  10         int dummy;
  11 };
  12
  13 static long write_vma(struct task_struct *task, struct vm_area_struct *vma,
  14                       struct callback_ctx *data)
  15 {
  16         /* writing to vma, which is illegal */
  17         vma->vm_start = 0xffffffffff600000;
  18
  19         return 0;
  20 }
  21
  22 SEC("raw_tp/sys_enter")
  23 int handle_getpid(void)
  24 {
  25         struct task_struct *task = bpf_get_current_task_btf();
  26         struct callback_ctx data = {};
  27
  28         bpf_find_vma(task, 0, write_vma, &data, 0);
  29         return 0;
  30 }