Subject: [PATCH] Add test for more file systems in landlock - ext4

[Julia Lawall]

On Tue, 2 Apr 2024, Saasha Gupta wrote:

> Date: Mon, 2 Apr 2024 19:59:56 +0530

Not clear why this is part of the message.

> RE: This patch is now properly preformatted.

Such a comment belongs below the ---.  People who look at the history of
the file in the git logs have no idea that the patch was previously ill
formatted.

julia

>
> Landlock LSM, a part of the security subsystem, has some tests in place
> for synthetic filesystems such as tmpfs, proc, sysfs, etc. The goal of
> the new issue, and hence this patch is to add tests for non synthetic
> file systems, such as ext4, btrfs, etc
>
> This patch adds tests for the ext4 file system. This includes creation
> of a loop device (test-ext4.img) and formating with mkfs.
>
> Signed-off-by: Saasha Gupta <saashaa1122 at gmail.com>
> ---
>  tools/testing/selftests/landlock/fs_test.c | 65 ++++++++++++++++++++++
>  1 file changed, 65 insertions(+)
>
> diff --git a/tools/testing/selftests/landlock/fs_test.c b/tools/testing/selftests/landlock/fs_test.c
> index 9a6036fbf..b2f2cd5a5 100644
> --- a/tools/testing/selftests/landlock/fs_test.c
> +++ b/tools/testing/selftests/landlock/fs_test.c
> @@ -4675,6 +4675,14 @@ FIXTURE_VARIANT_ADD(layout3_fs, hostfs) {
>  	.cwd_fs_magic = HOSTFS_SUPER_MAGIC,
>  };
>
> +/* Add more filesystems */
> +FIXTURE_VARIANT_ADD(layout3_fs, ext4) {
> +	.mnt = {
> +		.type = "ext4",
> +	},
> +	.file_path = TMP_DIR "/dir/file",
> +};
> +
>  FIXTURE_SETUP(layout3_fs)
>  {
>  	struct stat statbuf;
> @@ -4728,6 +4736,63 @@ FIXTURE_SETUP(layout3_fs)
>  		self->has_created_file = true;
>  		clear_cap(_metadata, CAP_DAC_OVERRIDE);
>  	}
> +
> +	/* Create non synthetic file system - ext4 */
> +	if (stat(self->dir_path, &statbuf) != 0) {
> +		pid_t pid = fork();
> +
> +		if (pid == -1) {
> +			perror("Failed to fork");
> +			exit(EXIT_FAILURE);
> +		} else if (pid == 0) {
> +			static const fallocate_argv[] = { "fallocate", "--length",
> +						   "4M", "test-ext4.img",
> +						   NULL };
> +			execvp(fallocate_argv[0], fallocate_argv);
> +			perror("execvp failed");
> +			exit(EXIT_FAILURE);
> +		} else {
> +			int status;
> +
> +			if (waitpid(pid, &status, 0) == -1) {
> +				perror("waitpid failed");
> +				exit(EXIT_FAILURE);
> +			}
> +			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
> +				TH_LOG(stderr,
> +					"Failed to create ext4 filesystem image: fallocate failed\n");
> +				exit(EXIT_FAILURE);
> +			}
> +		}
> +	}
> +
> +	/* Formate and mount non synthetic file system - ext4 */
> +	if (stat("mnt", &statbuf) != 0) {
> +		pid_t pid = fork();
> +
> +		if (pid == -1) {
> +			perror("Failed to fork");
> +			exit(EXIT_FAILURE);
> +		} else if (pid == 0) {
> +			static const mkfs_argv[] = { "mkfs.ext4", "-q",
> +					      "test-ext4.img", "mnt", NULL };
> +			execvp(mkfs_argv[0], mkfs_argv);
> +			perror("execvp failed");
> +			exit(EXIT_FAILURE);
> +		} else {
> +			int status;
> +
> +			if (waitpid(pid, &status, 0) == -1) {
> +				perror("waitpid failed");
> +				exit(EXIT_FAILURE);
> +			}
> +			if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
> +				TH_LOG(stderr,
> +					"Failed to format ext4 filesystem image: mkfs.ext4 failed\n");
> +				exit(EXIT_FAILURE);
> +			}
> +		}
> +	}
>  }
>
>  FIXTURE_TEARDOWN(layout3_fs)
> --
> 2.44.0
>
>
>
>