linux-hardening - [PATCH v2 2/2] selftests/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC

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Date:   Wed,  5 Jul 2023 06:33:15 +0000
From:   jeffxu@...omium.org
To:     skhan@...uxfoundation.org, keescook@...omium.org
Cc:     akpm@...ux-foundation.org, dmitry.torokhov@...il.com,
        dverkamp@...omium.org, asmadeus@...ewreck.org, hughd@...gle.com,
        jeffxu@...gle.com, jorgelo@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, jannh@...gle.com,
        linux-hardening@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: [PATCH v2 2/2] selftests/memfd: sysctl: fix MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED

From: Jeff Xu <jeffxu@...gle.com>

Add selftest for sysctl vm.memfd_noexec is 2
(MEMFD_NOEXEC_SCOPE_NOEXEC_ENFORCED)

memfd_create(.., MFD_EXEC) should fail in this case.

Reported-by: Dominique Martinet <asmadeus@...ewreck.org>
Closes: https://lore.kernel.org/linux-mm/CABi2SkXUX_QqTQ10Yx9bBUGpN1wByOi_=gZU6WEy5a8MaQY3Jw@mail.gmail.com/T/
Signed-off-by: Jeff Xu <jeffxu@...gle.com>
---
 tools/testing/selftests/memfd/memfd_test.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c
index dba0e8ba002f..dbdd9ec5e397 100644
--- a/tools/testing/selftests/memfd/memfd_test.c
+++ b/tools/testing/selftests/memfd/memfd_test.c
@@ -1147,6 +1147,11 @@ static void test_sysctl_child(void)
 	sysctl_assert_write("2");
 	mfd_fail_new("kern_memfd_sysctl_2",
 		MFD_CLOEXEC | MFD_ALLOW_SEALING);
+	mfd_fail_new("kern_memfd_sysctl_2_MFD_EXEC",
+		MFD_CLOEXEC | MFD_EXEC);
+	fd = mfd_assert_new("", 0, MFD_NOEXEC_SEAL);
+	close(fd);
+
 	sysctl_fail_write("0");
 	sysctl_fail_write("1");
 }
-- 
2.41.0.255.g8b1d071c50-goog