linux-kernel - [PATCH v20 4/6] selftests/landlock: Add tests for execveat + AT

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Message-ID: <20241011184422.977903-5-mic@digikod.net>
Date: Fri, 11 Oct 2024 20:44:20 +0200
From: Mickaël Salaün <mic@...ikod.net>
To: Al Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Paul Moore <paul@...l-moore.com>,
	Serge Hallyn <serge@...lyn.com>,
	Theodore Ts'o <tytso@....edu>
Cc: Mickaël Salaün <mic@...ikod.net>,
	Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
	Alejandro Colomar <alx@...nel.org>,
	Aleksa Sarai <cyphar@...har.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Casey Schaufler <casey@...aufler-ca.com>,
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	Elliott Hughes <enh@...gle.com>,
	Eric Biggers <ebiggers@...nel.org>,
	Eric Chiang <ericchiang@...gle.com>,
	Fan Wu <wufan@...ux.microsoft.com>,
	Florian Weimer <fweimer@...hat.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
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	Matthew Garrett <mjg59@...f.ucam.org>,
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	Mimi Zohar <zohar@...ux.ibm.com>,
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	Stephen Rothwell <sfr@...b.auug.org.au>,
	Steve Dower <steve.dower@...hon.org>,
	Steve Grubb <sgrubb@...hat.com>,
	Thibaut Sautereau <thibaut.sautereau@....gouv.fr>,
	Vincent Strubel <vincent.strubel@....gouv.fr>,
	Xiaoming Ni <nixiaoming@...wei.com>,
	Yin Fengwei <fengwei.yin@...el.com>,
	kernel-hardening@...ts.openwall.com,
	linux-api@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-integrity@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	Günther Noack <gnoack@...gle.com>
Subject: [PATCH v20 4/6] selftests/landlock: Add tests for execveat + AT_CHECK

Extend layout1.execute with the new AT_CHECK flag.  The semantic with
AT_CHECK is the same as with a simple execve(2),
LANDLOCK_ACCESS_FS_EXECUTE is enforced the same way.

Cc: Günther Noack <gnoack@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Paul Moore <paul@...l-moore.com>
Signed-off-by: Mickaël Salaün <mic@...ikod.net>
Link: https://lore.kernel.org/r/20241011184422.977903-5-mic@digikod.net
---
 tools/testing/selftests/landlock/fs_test.c | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index 6788762188fe..413be4fea21e 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c
@@ -37,6 +37,10 @@
 #include <linux/fs.h>
 #include <linux/mount.h>
 
+/* Defines AT_CHECK without type conflicts. */
+#define _ASM_GENERIC_FCNTL_H
+#include <linux/fcntl.h>
+
 #include "common.h"
 
 #ifndef renameat2
@@ -2008,6 +2012,21 @@ static void test_execute(struct __test_metadata *const _metadata, const int err,
 	};
 }
 
+static void test_check_exec(struct __test_metadata *const _metadata,
+			    const int err, const char *const path)
+{
+	int ret;
+	char *const argv[] = { (char *)path, NULL };
+
+	ret = execveat(AT_FDCWD, path, argv, NULL, AT_EMPTY_PATH | AT_CHECK);
+	if (err) {
+		EXPECT_EQ(-1, ret);
+		EXPECT_EQ(errno, err);
+	} else {
+		EXPECT_EQ(0, ret);
+	}
+}
+
 TEST_F_FORK(layout1, execute)
 {
 	const struct rule rules[] = {
@@ -2025,20 +2044,27 @@ TEST_F_FORK(layout1, execute)
 	copy_binary(_metadata, file1_s1d2);
 	copy_binary(_metadata, file1_s1d3);
 
+	/* Checks before file1_s1d1 being denied. */
+	test_execute(_metadata, 0, file1_s1d1);
+	test_check_exec(_metadata, 0, file1_s1d1);
+
 	enforce_ruleset(_metadata, ruleset_fd);
 	ASSERT_EQ(0, close(ruleset_fd));
 
 	ASSERT_EQ(0, test_open(dir_s1d1, O_RDONLY));
 	ASSERT_EQ(0, test_open(file1_s1d1, O_RDONLY));
 	test_execute(_metadata, EACCES, file1_s1d1);
+	test_check_exec(_metadata, EACCES, file1_s1d1);
 
 	ASSERT_EQ(0, test_open(dir_s1d2, O_RDONLY));
 	ASSERT_EQ(0, test_open(file1_s1d2, O_RDONLY));
 	test_execute(_metadata, 0, file1_s1d2);
+	test_check_exec(_metadata, 0, file1_s1d2);
 
 	ASSERT_EQ(0, test_open(dir_s1d3, O_RDONLY));
 	ASSERT_EQ(0, test_open(file1_s1d3, O_RDONLY));
 	test_execute(_metadata, 0, file1_s1d3);
+	test_check_exec(_metadata, 0, file1_s1d3);
 }
 
 TEST_F_FORK(layout1, link)
-- 
2.46.1