linux-kernel - [PATCH v2 11/11] kunit: uapi: Validate usability of /proc

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Message-Id: <20250407-kunit-kselftests-v2-11-454114e287fd@linutronix.de>
Date: Mon, 07 Apr 2025 09:42:48 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Andrew Morton <akpm@...ux-foundation.org>, Willy Tarreau <w@....eu>, 
 Thomas Weißschuh <linux@...ssschuh.net>, 
 Brendan Higgins <brendan.higgins@...ux.dev>, 
 David Gow <davidgow@...gle.com>, Rae Moar <rmoar@...gle.com>, 
 Shuah Khan <shuah@...nel.org>, Jonathan Corbet <corbet@....net>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>, 
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com, 
 linux-doc@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 11/11] kunit: uapi: Validate usability of /proc

Show that the selftests are executed from a fairly "normal"
userspace context.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 lib/kunit/kunit-example-uapi.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/kunit-example-uapi.c b/lib/kunit/kunit-example-uapi.c
index 4ce657050dd4a576632a41ca0309c4cb5134ce14..d121c4620716aadddc38a1d5845e4b51e721fb67 100644
--- a/lib/kunit/kunit-example-uapi.c
+++ b/lib/kunit/kunit-example-uapi.c
@@ -8,13 +8,47 @@
  * This is *userspace* code.
  */
 
+#ifndef NOLIBC
+#include <fcntl.h>
+#endif
+#include <unistd.h>
+#include <string.h>
+
 #include "../../tools/testing/selftests/kselftest.h"
 
+static void test_procfs(void)
+{
+	char buf[256];
+	ssize_t r;
+	int fd;
+
+	fd = open("/proc/self/comm", O_RDONLY);
+	if (fd == -1) {
+		ksft_test_result_fail("procfs: open() failed: %s\n", strerror(errno));
+		return;
+	}
+
+	r = read(fd, buf, sizeof(buf));
+	close(fd);
+
+	if (r == -1) {
+		ksft_test_result_fail("procfs: read() failed: %s\n", strerror(errno));
+		return;
+	}
+
+	if (r != 16 || strncmp("kunit-example-u\n", buf, 16) != 0) {
+		ksft_test_result_fail("procfs: incorrect comm\n");
+		return;
+	}
+
+	ksft_test_result_pass("procfs\n");
+}
+
 int main(void)
 {
 	ksft_print_header();
 	ksft_set_plan(4);
-	ksft_test_result_pass("userspace test 1\n");
+	test_procfs();
 	ksft_test_result_pass("userspace test 2\n");
 	ksft_test_result_skip("userspace test 3: some reason\n");
 	ksft_test_result_pass("userspace test 4\n");

-- 
2.49.0