Commit c2874823 authored by Hengqi Chen's avatar Hengqi Chen Committed by Andrii Nakryiko
Browse files

selftests/bpf: Test BPF_KPROBE_SYSCALL macro 



Add tests for the newly added BPF_KPROBE_SYSCALL macro.

Signed-off-by: default avatarHengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20220207143134.2977852-3-hengqi.chen@gmail.com
parent 816ae109

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

+6 −0
Original line number Diff line number Diff line
@@ -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);

}

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

+23 −0
Original line number Diff line number Diff line
@@ -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";