linux-kernel - Re: [PATCH -next 3/5] landlock/selftests: add selftests for chmod and chown

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Message-ID: <YwPYbY/HbHTOv7Ux@nuc>
Date:   Mon, 22 Aug 2022 21:26:37 +0200
From:   Günther Noack <gnoack3000@...il.com>
To:     Xiu Jianfeng <xiujianfeng@...wei.com>
Cc:     mic@...ikod.net, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com, shuah@...nel.org, corbet@....net,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH -next 3/5] landlock/selftests: add selftests for chmod
 and chown

On Mon, Aug 22, 2022 at 07:46:59PM +0800, Xiu Jianfeng wrote:
> +TEST_F_FORK(layout1, unhandled_chmod)
> +{
> +	const struct rule rules[] = {
> +		{
> +			.path = file2_s3d1,
> +			.access = LANDLOCK_ACCESS_FS_READ_FILE |
> +				  LANDLOCK_ACCESS_FS_WRITE_FILE,
> +		},
> +		{
> +			.path = file3_s3d1,
> +			.access = LANDLOCK_ACCESS_FS_READ_FILE |
> +				  LANDLOCK_ACCESS_FS_WRITE_FILE,
> +		},
> +		{},
> +	};
> +	const int ruleset_fd =
> +		create_ruleset(_metadata, ACCESS_RW, rules);
> +
> +	ASSERT_LE(0, ruleset_fd);
> +	enforce_ruleset(_metadata, ruleset_fd);
> +	ASSERT_EQ(0, close(ruleset_fd));
> +
> +	ASSERT_EQ(0, test_chmod(file2_s3d1));
> +	ASSERT_EQ(0, test_fchmod(file2_s3d1));
> +	ASSERT_EQ(0, test_chmod(file3_s3d1));
> +	ASSERT_EQ(0, test_chmod(dir_s3d1));
> +}

I missed it in the previous mail:

There are also the chown variants lchown() and fchownat(), as well as
the chmod variant fchmodat(), which might be interesting to test,
especially the symlink scenarios.

fchmodat() has a AT_SYMLINK_NOFOLLOW flag which does the chmod
equivalent to lchown().

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