[PATCH v3 16/16] kunit: uapi: Validate usability of /proc

From: "Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
To: "Masahiro Yamada" <masahiroy@kernel.org>,
	"Nathan Chancellor" <nathan@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Willy Tarreau" <w@1wt.eu>,
	"Thomas Weißschuh" <linux@weissschuh.net>,
	"Brendan Higgins" <brendan.higgins@linux.dev>,
	"David Gow" <davidgow@google.com>, "Rae Moar" <rmoar@google.com>,
	"Shuah Khan" <shuah@kernel.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Nicolas Schier" <nicolas.schier@linux.dev>,
	"Paul Walmsley" <paul.walmsley@sifive.com>,
	"Palmer Dabbelt" <palmer@dabbelt.com>,
	"Albert Ou" <aou@eecs.berkeley.edu>,
	"Alexandre Ghiti" <alex@ghiti.fr>,
	"Nicolas Schier" <nicolas.schier@linux.dev>
Cc: "Christophe Leroy" <christophe.leroy@csgroup.eu>,
	linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, kunit-dev@googlegroups.com,
	linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org,
	workflows@vger.kernel.org,
	"Thomas Weißschuh" <thomas.weissschuh@linutronix.de>
Subject: [PATCH v3 16/16] kunit: uapi: Validate usability of /proc
Date: Wed, 11 Jun 2025 09:38:22 +0200	[thread overview]
Message-ID: <20250611-kunit-kselftests-v3-16-55e3d148cbc6@linutronix.de> (raw)
In-Reply-To: <20250611-kunit-kselftests-v3-0-55e3d148cbc6@linutronix.de>

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

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 lib/kunit/kunit-example-uapi.c | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/lib/kunit/kunit-example-uapi.c b/lib/kunit/kunit-example-uapi.c
index 4ce657050dd4a576632a41ca0309c4cb5134ce14..5e7a0f3b68f182c42b03e667567e66f02d8c2b86 100644
--- a/lib/kunit/kunit-example-uapi.c
+++ b/lib/kunit/kunit-example-uapi.c
@@ -8,13 +8,45 @@
  * This is *userspace* code.
  */
 
+#include <fcntl.h>
+#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


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