[LTP] [PATCH v2] unlink: Add error tests for EPERM and EROFS

[Avinesh Kumar]

Hi,

Reviewed-by: Avinesh Kumar <akumar@suse.de>
with below typo fixes.

On Thursday, April 11, 2024 7:49:40 AM GMT+2 you wrote:
> Add negative cases for unlink(), when errno is EPERM or EROFS.
> 
> Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
> ---
>  runtest/syscalls                            |   1 +
>  testcases/kernel/syscalls/unlink/.gitignore |   1 +
>  testcases/kernel/syscalls/unlink/unlink09.c | 102 ++++++++++++++++++++
>  3 files changed, 104 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/unlink/unlink09.c
> 
> diff --git a/runtest/syscalls b/runtest/syscalls
> index 4ed2b5602..b99ce7170 100644
> --- a/runtest/syscalls
> +++ b/runtest/syscalls
> @@ -1651,6 +1651,7 @@ unlink01 symlink01 -T unlink01
>  unlink05 unlink05
>  unlink07 unlink07
>  unlink08 unlink08
> +unlink09 unlink09
> 
>  #unlinkat test cases
>  unlinkat01 unlinkat01
> diff --git a/testcases/kernel/syscalls/unlink/.gitignore
> b/testcases/kernel/syscalls/unlink/.gitignore index 2e783580d..6038cc29d
> 100644
> --- a/testcases/kernel/syscalls/unlink/.gitignore
> +++ b/testcases/kernel/syscalls/unlink/.gitignore
> @@ -1,3 +1,4 @@
>  /unlink05
>  /unlink07
>  /unlink08
> +/unlink09
> diff --git a/testcases/kernel/syscalls/unlink/unlink09.c
> b/testcases/kernel/syscalls/unlink/unlink09.c new file mode 100644
> index 000000000..3ab478e50
> --- /dev/null
> +++ b/testcases/kernel/syscalls/unlink/unlink09.c
> @@ -0,0 +1,102 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * Copyright (c) 2024 FUJITSU LIMITED. All Rights Reserved.
> + * Author: Yang Xu <xuyang2018.jy@fujitsu.com>
> + */
> +
> +/*\
> + * [Description]
> + *
> + * Verify that unlink(2) fails with
> + *
> + * - EPERM when target file is marked as immutable or append-only
> + * - EROFS when target file is on a read-only filesystem.
> + */
> +
> +#include <sys/ioctl.h>
> +#include "tst_test.h"
> +#include "lapi/fs.h"
> +
> +#define TEST_EPERM_IMMUTABLE "test_eperm_immutable"
> +#define TEST_EPERM_APPEND_ONLY "test_eperm_append_only"
> +#define DIR_EROFS "erofs"
> +#define TEST_EROFS "erofs/test_erofs"
> +
> +static int fd_immutable;
> +static int fd_append_only;
> +
> +static struct test_case_t {
> +	char *filename;
> +	int *fd;
> +	int flag;
> +	int expected_errno;
> +	char *desc;
> +} tcases[] = {
> +	{TEST_EPERM_IMMUTABLE, &fd_immutable, FS_IMMUTABLE_FL, EPERM,
> +		"target file is immutable"},
> +	{TEST_EPERM_APPEND_ONLY, &fd_append_only, FS_APPEND_FL, EPERM,
> +		"target file is append-only"},
> +	{TEST_EROFS, NULL, 0, EROFS, "target file in read-only filesystem"},
> +};
> +
> +static void setup(void)
> +{
> +	int attr;
> +
> +	fd_immutable = SAFE_OPEN(TEST_EPERM_IMMUTABLE, O_CREAT, 0600);
> +	SAFE_IOCTL(fd_immutable, FS_IOC_GETFLAGS, &attr);
> +	attr |= FS_IMMUTABLE_FL;
> +	SAFE_IOCTL(fd_immutable, FS_IOC_SETFLAGS, &attr);
> +
> +	fd_append_only = SAFE_OPEN(TEST_EPERM_APPEND_ONLY, O_CREAT, 0600);
> +	SAFE_IOCTL(fd_append_only, FS_IOC_GETFLAGS, &attr);
> +	attr |= FS_APPEND_FL;
> +	SAFE_IOCTL(fd_append_only, FS_IOC_SETFLAGS, &attr);
> +}
> +
> +static void cleanup(void)
> +{
> +	int attr;
> +
> +	SAFE_IOCTL(fd_immutable, FS_IOC_GETFLAGS, &attr);
> +	attr &= ~FS_IMMUTABLE_FL;
> +	SAFE_IOCTL(fd_immutable, FS_IOC_SETFLAGS, &attr);
> +	SAFE_CLOSE(fd_immutable);
> +
> +	SAFE_IOCTL(fd_append_only, FS_IOC_GETFLAGS, &attr);
> +	attr &= ~FS_APPEND_FL;
> +	SAFE_IOCTL(fd_append_only, FS_IOC_SETFLAGS, &attr);
> +	SAFE_CLOSE(fd_append_only);
> +}
> +
> +static void verify_unlink(unsigned int i)
> +{
> +	struct test_case_t *tc = &tcases[i];
> +	int attr;
> +
> +	TST_EXP_FAIL(unlink(tc->filename), tc->expected_errno, "%s", tc->desc);
> +
> +	/* If unlink() suceeded unexpectedly, test file should be retored. */
s/suceeded/succeeded
s/retored/restored
> +	if (!TST_RET) {
> +		if (tc->fd) {
> +			*(tc->fd) = SAFE_OPEN(tc->filename, O_CREAT, 0600);
> +			if (tc->flag) {
> +				SAFE_IOCTL(*(tc->fd), FS_IOC_GETFLAGS, &attr);
> +				attr |= tc->flag;
> +				SAFE_IOCTL(*(tc->fd), FS_IOC_SETFLAGS, &attr);
> +			}
> +		} else {
> +			SAFE_TOUCH(tc->filename, 0600, 0);
> +		}
> +	}
> +}
> +
> +static struct tst_test test = {
> +	.setup = setup,
> +	.tcnt = ARRAY_SIZE(tcases),
> +	.cleanup = cleanup,
> +	.test = verify_unlink,
> +	.needs_rofs = 1,
> +	.mntpoint = DIR_EROFS,
> +	.needs_root = 1,
> +};

Regards,
Avinesh