[PATCH v10 09/11] selftests/landlock: Test ftruncate on FDs created by memfd_create(2)
From: Günther Noack <hidden>
Date: 2022-10-18 18:23:16
Also in:
linux-fsdevel
Subsystem:
kernel selftest framework, landlock security module, the rest · Maintainers:
Shuah Khan, Mickaël Salaün, Linus Torvalds
All file descriptors that are truncatable need to have the Landlock access rights set correctly on the file's Landlock security blob. This is also the case for files that are opened by other means than open(2). Signed-off-by: Günther Noack <redacted> --- tools/testing/selftests/landlock/fs_test.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
index f8aae01a2409..d5dab986f612 100644
--- a/tools/testing/selftests/landlock/fs_test.c
+++ b/tools/testing/selftests/landlock/fs_test.c@@ -3603,6 +3603,22 @@ TEST_F_FORK(ftruncate, open_and_ftruncate_in_different_processes) ASSERT_EQ(0, close(socket_fds[1])); } +TEST(memfd_ftruncate) +{ + int fd; + + fd = memfd_create("name", MFD_CLOEXEC); + ASSERT_LE(0, fd); + + /* + * Checks that ftruncate is permitted on file descriptors that are + * created in ways other than open(2). + */ + EXPECT_EQ(0, test_ftruncate(fd)); + + ASSERT_EQ(0, close(fd)); +} + /* clang-format off */ FIXTURE(layout1_bind) {}; /* clang-format on */
--
2.38.0