linux-kernel - [PATCH RFCv2 17/18] selftests/bpf: Add uprobe syscall sigill signal test

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Message-ID: <20250224140151.667679-18-jolsa@kernel.org>
Date: Mon, 24 Feb 2025 15:01:49 +0100
From: Jiri Olsa <jolsa@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	x86@...nel.org,
	Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Hao Luo <haoluo@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Alan Maguire <alan.maguire@...cle.com>,
	David Laight <David.Laight@...LAB.COM>,
	Thomas Weißschuh <thomas@...ch.de>
Subject: [PATCH RFCv2 17/18] 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: Jiri Olsa <jolsa@...nel.org>
---
 .../selftests/bpf/prog_tests/uprobe_syscall.c | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
index 3f320da4ac46..c5894ddc5b5e 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
@@ -631,6 +631,40 @@ static void test_uprobe_race(void)
 		pthread_join(threads[i], NULL);
 }
 
+#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"))
@@ -649,6 +683,8 @@ 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)
-- 
2.48.1