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

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Test that anonymous inodes cannot be chown()ed.

Link: https://lore.kernel.org/20250407-work-anon_inode-v1-6-53a44c20d44e@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 11:54:20 +02:00
parent 1ed95281c0
commit c784159750
3 changed files with 28 additions and 1 deletions
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1
tools/testing/selftests/filesystems/.gitignore vendored
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@@ -2,3 +2,4 @@
dnotify_test
devpts_pts
file_stressor
anon_inode_test

2
tools/testing/selftests/filesystems/Makefile
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@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
CFLAGS += $(KHDR_INCLUDES)
TEST_GEN_PROGS := devpts_pts file_stressor
TEST_GEN_PROGS := devpts_pts file_stressor anon_inode_test
TEST_GEN_PROGS_EXTENDED := dnotify_test
include ../lib.mk

26
tools/testing/selftests/filesystems/anon_inode_test.c Normal file
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@@ -0,0 +1,26 @@
// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#define __SANE_USERSPACE_TYPES__
#include <fcntl.h>
#include <stdio.h>
#include <sys/stat.h>
#include "../kselftest_harness.h"
#include "overlayfs/wrappers.h"
TEST(anon_inode_no_chown)
{
int fd_context;
fd_context = sys_fsopen("tmpfs", 0);
ASSERT_GE(fd_context, 0);
ASSERT_LT(fchown(fd_context, 1234, 5678), 0);
ASSERT_EQ(errno, EOPNOTSUPP);
EXPECT_EQ(close(fd_context), 0);
}
TEST_HARNESS_MAIN