From fcf31ec7cade5b17699bc2ed04cacbc92b14a864 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Mon, 7 Apr 2025 11:54:21 +0200 Subject: [PATCH] selftests/filesystems: add chmod() test for anonymous inodes Test that anonymous inodes cannot be chmod()ed. Link: https://lore.kernel.org/20250407-work-anon_inode-v1-7-53a44c20d44e@kernel.org Reviewed-by: Jeff Layton Signed-off-by: Christian Brauner --- .../testing/selftests/filesystems/anon_inode_test.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tools/testing/selftests/filesystems/anon_inode_test.c b/tools/testing/selftests/filesystems/anon_inode_test.c index f2cae8f1ccae..7c4d0a225363 100644 --- a/tools/testing/selftests/filesystems/anon_inode_test.c +++ b/tools/testing/selftests/filesystems/anon_inode_test.c @@ -22,5 +22,18 @@ TEST(anon_inode_no_chown) EXPECT_EQ(close(fd_context), 0); } +TEST(anon_inode_no_chmod) +{ + int fd_context; + + fd_context = sys_fsopen("tmpfs", 0); + ASSERT_GE(fd_context, 0); + + ASSERT_LT(fchmod(fd_context, 0777), 0); + ASSERT_EQ(errno, EOPNOTSUPP); + + EXPECT_EQ(close(fd_context), 0); +} + TEST_HARNESS_MAIN -- 2.25.1