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

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/bpf.h>
   4 #include <bpf/bpf_helpers.h>
   5 #include <bpf/bpf_tracing.h>
   6
   7 #include <sys/types.h>
   8
   9 pid_t pid = 0;
  10 long ret = 0;
  11 void *user_ptr = 0;
  12 char buf[256] = {};
  13
  14 SEC("tracepoint/syscalls/sys_enter_nanosleep")
  15 int on_write(void *ctx)
  16 {
  17         if (pid != (bpf_get_current_pid_tgid() >> 32))
  18                 return 0;
  19
  20         ret = bpf_probe_read_user_str(buf, sizeof(buf), user_ptr);
  21
  22         return 0;
  23 }
  24
  25 char _license[] SEC("license") = "GPL";