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

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Date:   Sat, 27 Aug 2022 19:14:30 +0800
From:   xiujianfeng <xiujianfeng@...wei.com>
To:     Günther Noack <gnoack3000@...il.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

Hi，

在 2022/8/23 3:26, Günther Noack 写道:
> 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().
> 

man fchmodat shows as follows:
...
AT_SYMLINK_NOFOLLOW
If pathname is a symbolic link, do not dereference it: instead operate 
on the link itself. This flag is not currently implemented.
...

so I suppose this can not be test. Please correct me if I am wrong.
thanks.

> --
> .
>