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Date: Fri, 5 Aug 2022 22:21:25 +0000 From: <jeffxu@...gle.com> To: skhan@...uxfoundation.org Cc: akpm@...ux-foundation.org, dmitry.torokhov@...il.com, dverkamp@...omium.org, hughd@...gle.com, jeffxu@...gle.com, jorgelo@...omium.org, keescook@...omium.org, linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-mm@...ck.org, mnissler@...omium.org, jannh@...gle.com, Jeff Xu <jeffxu@...omium.org> Subject: [PATCH v2 4/5] selftests/memfd: add tests for MFD_NOEXEC From: Daniel Verkamp <dverkamp@...omium.org> Tests that ensure MFD_NOEXEC memfds have the appropriate mode bits and cannot be chmod-ed into being executable. Co-developed-by: Jeff Xu <jeffxu@...omium.org> Signed-off-by: Jeff Xu <jeffxu@...omium.org> Signed-off-by: Daniel Verkamp <dverkamp@...omium.org> --- tools/testing/selftests/memfd/memfd_test.c | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/tools/testing/selftests/memfd/memfd_test.c b/tools/testing/selftests/memfd/memfd_test.c index 1d7e7b36bbdd..4906f778564e 100644 --- a/tools/testing/selftests/memfd/memfd_test.c +++ b/tools/testing/selftests/memfd/memfd_test.c @@ -36,6 +36,10 @@ #define MAX_PATH 256 #endif +#ifndef MFD_NOEXEC +#define MFD_NOEXEC 0x0008U +#endif + /* * Default is not to test hugetlbfs */ @@ -1006,6 +1010,35 @@ static void test_seal_exec(void) close(fd); } +/* + * Test memfd_create with MFD_NOEXEC flag + * Test that MFD_NOEXEC applies F_SEAL_EXEC and prevents change of exec bits + */ +static void test_noexec(void) +{ + int fd; + + printf("%s NOEXEC\n", memfd_str); + + /* Create with NOEXEC and ALLOW_SEALING */ + fd = mfd_assert_new("kern_memfd_noexec", + mfd_def_size, + MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_NOEXEC); + mfd_assert_mode(fd, 0666); + mfd_assert_has_seals(fd, F_SEAL_EXEC); + mfd_fail_chmod(fd, 0777); + close(fd); + + /* Create with NOEXEC but without ALLOW_SEALING */ + fd = mfd_assert_new("kern_memfd_noexec", + mfd_def_size, + MFD_CLOEXEC | MFD_NOEXEC); + mfd_assert_mode(fd, 0666); + mfd_assert_has_seals(fd, F_SEAL_EXEC | F_SEAL_SEAL); + mfd_fail_chmod(fd, 0777); + close(fd); +} + /* * Test sharing via dup() * Test that seals are shared between dupped FDs and they're all equal. @@ -1179,6 +1212,7 @@ int main(int argc, char **argv) test_create(); test_basic(); + test_noexec(); test_seal_write(); test_seal_future_write(); -- 2.37.1.559.g78731f0fdb-goog
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