From: Günther Noack Date: Tue, 18 Oct 2022 18:22:14 +0000 (+0200) Subject: selftests/landlock: Test ftruncate on FDs created by memfd_create(2) X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0d8c658be264eb2106349c50377ef8a81edc0106;p=linux.git selftests/landlock: Test ftruncate on FDs created by memfd_create(2) 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). Test coverage for security/landlock is 94.7% of 838 lines according to gcc/gcov-11. Signed-off-by: Günther Noack Link: https://lore.kernel.org/r/20221018182216.301684-10-gnoack3000@gmail.com [mic: Add test coverage in commit message] Signed-off-by: Mickaël Salaün --- diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c index f8aae01a2409e..d5dab986f6125 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 */