tools/testing/selftests/bpf/prog_tests/test_bpf_syscall_macro.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright 2022 Sony Group Corporation */
   3 #define _GNU_SOURCE
   4 #include <fcntl.h>
   5 #include <sys/prctl.h>
   6 #include <test_progs.h>
   7 #include "bpf_syscall_macro.skel.h"
   8
   9 void test_bpf_syscall_macro(void)
  10 {
  11         struct bpf_syscall_macro *skel = NULL;
  12         int err;
  13         int exp_arg1 = 1001;
  14         unsigned long exp_arg2 = 12;
  15         unsigned long exp_arg3 = 13;
  16         unsigned long exp_arg4 = 14;
  17         unsigned long exp_arg5 = 15;
  18         loff_t off_in, off_out;
  19         ssize_t r;
  20
  21         /* check whether it can open program */
  22         skel = bpf_syscall_macro__open();
  23         if (!ASSERT_OK_PTR(skel, "bpf_syscall_macro__open"))
  24                 return;
  25
  26         skel->rodata->filter_pid = getpid();
  27
  28         /* check whether it can load program */
  29         err = bpf_syscall_macro__load(skel);
  30         if (!ASSERT_OK(err, "bpf_syscall_macro__load"))
  31                 goto cleanup;
  32
  33         /* check whether it can attach kprobe */
  34         err = bpf_syscall_macro__attach(skel);
  35         if (!ASSERT_OK(err, "bpf_syscall_macro__attach"))
  36                 goto cleanup;
  37
  38         /* check whether args of syscall are copied correctly */
  39         prctl(exp_arg1, exp_arg2, exp_arg3, exp_arg4, exp_arg5);
  40
  41         ASSERT_EQ(skel->bss->arg1, exp_arg1, "syscall_arg1");
  42         ASSERT_EQ(skel->bss->arg2, exp_arg2, "syscall_arg2");
  43         ASSERT_EQ(skel->bss->arg3, exp_arg3, "syscall_arg3");
  44         /* it cannot copy arg4 when uses PT_REGS_PARM4 on x86_64 */
  45 #ifdef __x86_64__
  46         ASSERT_NEQ(skel->bss->arg4_cx, exp_arg4, "syscall_arg4_from_cx");
  47 #else
  48         ASSERT_EQ(skel->bss->arg4_cx, exp_arg4, "syscall_arg4_from_cx");
  49 #endif
  50         ASSERT_EQ(skel->bss->arg4, exp_arg4, "syscall_arg4");
  51         ASSERT_EQ(skel->bss->arg5, exp_arg5, "syscall_arg5");
  52
  53         /* check whether args of syscall are copied correctly for CORE variants */
  54         ASSERT_EQ(skel->bss->arg1_core, exp_arg1, "syscall_arg1_core_variant");
  55         ASSERT_EQ(skel->bss->arg2_core, exp_arg2, "syscall_arg2_core_variant");
  56         ASSERT_EQ(skel->bss->arg3_core, exp_arg3, "syscall_arg3_core_variant");
  57         /* it cannot copy arg4 when uses PT_REGS_PARM4_CORE on x86_64 */
  58 #ifdef __x86_64__
  59         ASSERT_NEQ(skel->bss->arg4_core_cx, exp_arg4, "syscall_arg4_from_cx_core_variant");
  60 #else
  61         ASSERT_EQ(skel->bss->arg4_core_cx, exp_arg4, "syscall_arg4_from_cx_core_variant");
  62 #endif
  63         ASSERT_EQ(skel->bss->arg4_core, exp_arg4, "syscall_arg4_core_variant");
  64         ASSERT_EQ(skel->bss->arg5_core, exp_arg5, "syscall_arg5_core_variant");
  65
  66         ASSERT_EQ(skel->bss->option_syscall, exp_arg1, "BPF_KPROBE_SYSCALL_option");
  67         ASSERT_EQ(skel->bss->arg2_syscall, exp_arg2, "BPF_KPROBE_SYSCALL_arg2");
  68         ASSERT_EQ(skel->bss->arg3_syscall, exp_arg3, "BPF_KPROBE_SYSCALL_arg3");
  69         ASSERT_EQ(skel->bss->arg4_syscall, exp_arg4, "BPF_KPROBE_SYSCALL_arg4");
  70         ASSERT_EQ(skel->bss->arg5_syscall, exp_arg5, "BPF_KPROBE_SYSCALL_arg5");
  71
  72         r = splice(-42, &off_in, 42, &off_out, 0x12340000, SPLICE_F_NONBLOCK);
  73         err = -errno;
  74         ASSERT_EQ(r, -1, "splice_res");
  75         ASSERT_EQ(err, -EBADF, "splice_err");
  76
  77         ASSERT_EQ(skel->bss->splice_fd_in, -42, "splice_arg1");
  78         ASSERT_EQ(skel->bss->splice_off_in, (__u64)&off_in, "splice_arg2");
  79         ASSERT_EQ(skel->bss->splice_fd_out, 42, "splice_arg3");
  80         ASSERT_EQ(skel->bss->splice_off_out, (__u64)&off_out, "splice_arg4");
  81         ASSERT_EQ(skel->bss->splice_len, 0x12340000, "splice_arg5");
  82         ASSERT_EQ(skel->bss->splice_flags, SPLICE_F_NONBLOCK, "splice_arg6");
  83
  84 cleanup:
  85         bpf_syscall_macro__destroy(skel);
  86 }