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selftests/bpf: Test BPF_KPROBE_SYSCALL macro

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Add tests for the newly added BPF_KPROBE_SYSCALL macro.

Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220207143134.2977852-3-hengqi.chen@gmail.com
This commit is contained in:
Hengqi Chen 2022-02-07 22:31:34 +08:00 committed by Andrii Nakryiko
parent 816ae10955
commit c28748233b
2 changed files with 29 additions and 0 deletions
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6
tools/testing/selftests/bpf/prog_tests/test_bpf_syscall_macro.c
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@ -62,6 +62,12 @@ void test_bpf_syscall_macro(void)
ASSERT_EQ(skel->bss->arg4_core, exp_arg4, "syscall_arg4_core_variant");
ASSERT_EQ(skel->bss->arg5_core, exp_arg5, "syscall_arg5_core_variant");
ASSERT_EQ(skel->bss->option_syscall, exp_arg1, "BPF_KPROBE_SYSCALL_option");
ASSERT_EQ(skel->bss->arg2_syscall, exp_arg2, "BPF_KPROBE_SYSCALL_arg2");
ASSERT_EQ(skel->bss->arg3_syscall, exp_arg3, "BPF_KPROBE_SYSCALL_arg3");
ASSERT_EQ(skel->bss->arg4_syscall, exp_arg4, "BPF_KPROBE_SYSCALL_arg4");
ASSERT_EQ(skel->bss->arg5_syscall, exp_arg5, "BPF_KPROBE_SYSCALL_arg5");
cleanup:
bpf_syscall_macro__destroy(skel);
}

23
tools/testing/selftests/bpf/progs/bpf_syscall_macro.c
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@ -21,6 +21,12 @@ unsigned long arg4_core_cx = 0;
unsigned long arg4_core = 0;
unsigned long arg5_core = 0;
int option_syscall = 0;
unsigned long arg2_syscall = 0;
unsigned long arg3_syscall = 0;
unsigned long arg4_syscall = 0;
unsigned long arg5_syscall = 0;
const volatile pid_t filter_pid = 0;
SEC("kprobe/" SYS_PREFIX "sys_prctl")
@ -58,4 +64,21 @@ int BPF_KPROBE(handle_sys_prctl)
return 0;
}
SEC("kprobe/" SYS_PREFIX "sys_prctl")
int BPF_KPROBE_SYSCALL(prctl_enter, int option, unsigned long arg2,
unsigned long arg3, unsigned long arg4, unsigned long arg5)
{
pid_t pid = bpf_get_current_pid_tgid() >> 32;
if (pid != filter_pid)
return 0;
option_syscall = option;
arg2_syscall = arg2;
arg3_syscall = arg3;
arg4_syscall = arg4;
arg5_syscall = arg5;
return 0;
}
char _license[] SEC("license") = "GPL";