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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Converted from tools/testing/selftests/bpf/verifier/d_path.c */
   3
   4 #include <linux/bpf.h>
   5 #include <bpf/bpf_helpers.h>
   6 #include "bpf_misc.h"
   7
   8 SEC("fentry/dentry_open")
   9 __description("d_path accept")
  10 __success __retval(0)
  11 __naked void d_path_accept(void)
  12 {
  13         asm volatile ("                                 \
  14         r1 = *(u32*)(r1 + 0);                           \
  15         r2 = r10;                                       \
  16         r2 += -8;                                       \
  17         r6 = 0;                                         \
  18         *(u64*)(r2 + 0) = r6;                           \
  19         r3 = 8 ll;                                      \
  20         call %[bpf_d_path];                             \
  21         r0 = 0;                                         \
  22         exit;                                           \
  23 "       :
  24         : __imm(bpf_d_path)
  25         : __clobber_all);
  26 }
  27
  28 SEC("fentry/d_path")
  29 __description("d_path reject")
  30 __failure __msg("helper call is not allowed in probe")
  31 __naked void d_path_reject(void)
  32 {
  33         asm volatile ("                                 \
  34         r1 = *(u32*)(r1 + 0);                           \
  35         r2 = r10;                                       \
  36         r2 += -8;                                       \
  37         r6 = 0;                                         \
  38         *(u64*)(r2 + 0) = r6;                           \
  39         r3 = 8 ll;                                      \
  40         call %[bpf_d_path];                             \
  41         r0 = 0;                                         \
  42         exit;                                           \
  43 "       :
  44         : __imm(bpf_d_path)
  45         : __clobber_all);
  46 }
  47
  48 char _license[] SEC("license") = "GPL";