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selftests/filesystems: add open() test for anonymous inodes

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Test that anonymous inodes cannot be open()ed.

Link: https://lore.kernel.org/20250407-work-anon_inode-v1-9-53a44c20d44e@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-04-07 11:54:23 +02:00
parent f8ca403ae7
commit 25a6cc9a63
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1 changed files with 17 additions and 0 deletions
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17
tools/testing/selftests/filesystems/anon_inode_test.c
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@ -48,5 +48,22 @@ TEST(anon_inode_no_exec)
EXPECT_EQ(close(fd_context), 0);
}
TEST(anon_inode_no_open)
{
int fd_context;
fd_context = sys_fsopen("tmpfs", 0);
ASSERT_GE(fd_context, 0);
ASSERT_GE(dup2(fd_context, 500), 0);
ASSERT_EQ(close(fd_context), 0);
fd_context = 500;
ASSERT_LT(open("/proc/self/fd/500", 0), 0);
ASSERT_EQ(errno, ENXIO);
EXPECT_EQ(close(fd_context), 0);
}
TEST_HARNESS_MAIN