Unverified Commit c7841597 authored by Christian Brauner's avatar Christian Brauner
Browse files

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

Test that anonymous inodes cannot be chown()ed.

Link: https://lore.kernel.org/20250407-work-anon_inode-v1-6-53a44c20d44e@kernel.org


Reviewed-by: default avatarJeff Layton <jlayton@kernel.org>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 1ed95281

tools/testing/selftests/filesystems/.gitignore

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@@ -2,3 +2,4 @@ 
dnotify_test

devpts_pts

file_stressor

anon_inode_test

tools/testing/selftests/filesystems/Makefile

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# 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

tools/testing/selftests/filesystems/anon_inode_test.c

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// 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