linux-kernel - [PATCH perf/core 2/3] selftests/bpf: Fix uprobe_sigill test for uprobe syscall error value

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Message-ID: <20250905205731.1961288-3-jolsa@kernel.org>
Date: Fri,  5 Sep 2025 22:57:30 +0200
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>,
	Ingo Molnar <mingo@...nel.org>,
	Jann Horn <jannh@...gle.com>,
	Alejandro Colomar <alx@...nel.org>
Subject: [PATCH perf/core 2/3] selftests/bpf: Fix uprobe_sigill test for uprobe syscall error value

The uprobe syscall now returns -ENXIO errno when called outside
kernel trampoline, fixing the current sigill test to reflect that
and renaming it to uprobe_error.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 .../selftests/bpf/prog_tests/uprobe_syscall.c | 34 ++++---------------
 1 file changed, 6 insertions(+), 28 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
index 5da0b49eeaca..6d75ede16e7c 100644
--- a/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
+++ b/tools/testing/selftests/bpf/prog_tests/uprobe_syscall.c
@@ -757,34 +757,12 @@ static void test_uprobe_race(void)
 #define __NR_uprobe 336
 #endif
 
-static void test_uprobe_sigill(void)
+static void test_uprobe_error(void)
 {
-	int status, err, pid;
+	long err = syscall(__NR_uprobe);
 
-	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");
+	ASSERT_EQ(err, -1, "error");
+	ASSERT_EQ(errno, ENXIO, "errno");
 }
 
 static void __test_uprobe_syscall(void)
@@ -805,8 +783,8 @@ 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();
+	if (test__start_subtest("uprobe_error"))
+		test_uprobe_error();
 	if (test__start_subtest("uprobe_regs_equal"))
 		test_uprobe_regs_equal(false);
 	if (test__start_subtest("regs_change"))
-- 
2.51.0