Commit c11661bd authored by Jiri Olsa's avatar Jiri Olsa Committed by Peter Zijlstra
Browse files

selftests/bpf: Add uprobe syscall sigill signal test 



Make sure that calling uprobe syscall from outside uprobe trampoline
results in sigill signal.

Signed-off-by: default avatarJiri Olsa <jolsa@kernel.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20250720112133.244369-17-jolsa@kernel.org
parent c8be5966

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

+36 −0
Original line number Diff line number Diff line
@@ -735,6 +735,40 @@ static void test_uprobe_race(void) 
	ASSERT_FALSE(USDT_SEMA_IS_ACTIVE(race), "race_semaphore");

}



#ifndef __NR_uprobe

#define __NR_uprobe 336

#endif



static void test_uprobe_sigill(void)

{

	int status, err, pid;



	pid = fork();

	if (!ASSERT_GE(pid, 0, "fork"))

		return;

	/* child */

	if (pid == 0) {

		asm volatile (

			"pushq %rax\n"

			"pushq %rcx\n"

			"pushq %r11\n"

			"movq $" __stringify(__NR_uprobe) ", %rax\n"

			"syscall\n"

			"popq %r11\n"

			"popq %rcx\n"

			"retq\n"

		);

		exit(0);

	}



	err = waitpid(pid, &status, 0);

	ASSERT_EQ(err, pid, "waitpid");



	/* verify the child got killed with SIGILL */

	ASSERT_EQ(WIFSIGNALED(status), 1, "WIFSIGNALED");

	ASSERT_EQ(WTERMSIG(status), SIGILL, "WTERMSIG");

}



static void __test_uprobe_syscall(void)

{

	if (test__start_subtest("uretprobe_regs_equal"))
@@ -755,6 +789,8 @@ static void __test_uprobe_syscall(void) 
		test_uprobe_usdt();

	if (test__start_subtest("uprobe_race"))

		test_uprobe_race();

	if (test__start_subtest("uprobe_sigill"))

		test_uprobe_sigill();

}

#else

static void __test_uprobe_syscall(void)