From: "Mickaël Salaün" <mic@digikod.net>
To: Paul Moore <paul@paul-moore.com>
Cc: "James Morris" <jmorris@namei.org>,
"Serge E . Hallyn" <serge@hallyn.com>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Jann Horn" <jannh@google.com>,
"Kees Cook" <keescook@chromium.org>,
"Konstantin Meskhidze" <konstantin.meskhidze@huawei.com>,
"Shuah Khan" <shuah@kernel.org>,
linux-doc@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org,
"Mickaël Salaün" <mic@linux.microsoft.com>
Subject: Re: [PATCH v1 05/11] landlock: Move filesystem helpers and add a new one
Date: Thu, 17 Mar 2022 11:42:35 +0100 [thread overview]
Message-ID: <33d4a0fc-1b77-39df-31e9-ba974b851a97@digikod.net> (raw)
In-Reply-To: <CAHC9VhQM33jnJYMz+z1YoNt9=nNceW=TutuGO=x+SSpHW7PMyg@mail.gmail.com>
On 17/03/2022 02:26, Paul Moore wrote:
> On Mon, Feb 21, 2022 at 4:15 PM Mickaël Salaün <mic@digikod.net> wrote:
>>
>> From: Mickaël Salaün <mic@linux.microsoft.com>
>>
>> Move the SB_NOUSER and IS_PRIVATE dentry check to a standalone
>> is_nouser_or_private() helper. This will be useful for a following
>> commit.
>>
>> Move get_mode_access() and maybe_remove() to make them usable by new
>> code provided by a following commit.
>>
>> Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
>> Link: https://lore.kernel.org/r/20220221212522.320243-6-mic@digikod.net
>> ---
>> security/landlock/fs.c | 87 ++++++++++++++++++++++--------------------
>> 1 file changed, 46 insertions(+), 41 deletions(-)
>
> One nit-picky comment below, otherwise it looks fine to me.
>
> Reviewed-by: Paul Moore <paul@paul-moore.com>
>
>> diff --git a/security/landlock/fs.c b/security/landlock/fs.c
>> index 9662f9fb3cd0..3886f9ad1a60 100644
>> --- a/security/landlock/fs.c
>> +++ b/security/landlock/fs.c
>> @@ -257,6 +257,18 @@ static inline bool unmask_layers(const struct landlock_rule *const rule,
>> return false;
>> }
>>
>> +static inline bool is_nouser_or_private(const struct dentry *dentry)
>> +{
>> + /*
>> + * Allows access to pseudo filesystems that will never be mountable
>> + * (e.g. sockfs, pipefs), but can still be reachable through
>> + * /proc/<pid>/fd/<file-descriptor> .
>> + */
>
> I might suggest moving this explanation up to a function header comment block.
Sounds good.
>
>
>> + return (dentry->d_sb->s_flags & SB_NOUSER) ||
>> + (d_is_positive(dentry) &&
>> + unlikely(IS_PRIVATE(d_backing_inode(dentry))));
>> +}
>> +
>> static int check_access_path(const struct landlock_ruleset *const domain,
>> const struct path *const path,
>> const access_mask_t access_request)
>
> --
> paul-moore.com
next prev parent reply other threads:[~2022-03-17 10:42 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-21 21:25 [PATCH v1 00/11] Landlock: file linking and renaming support Mickaël Salaün
2022-02-21 21:25 ` [PATCH v1 01/11] landlock: Define access_mask_t to enforce a consistent access mask size Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-03-17 8:36 ` Mickaël Salaün
2022-03-17 21:31 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 02/11] landlock: Reduce the maximum number of layers to 16 Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 03/11] landlock: Create find_rule() from unmask_layers() Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 04/11] landlock: Fix same-layer rule unions Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-03-17 10:41 ` Mickaël Salaün
2022-03-17 21:34 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 05/11] landlock: Move filesystem helpers and add a new one Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-03-17 10:42 ` Mickaël Salaün [this message]
2022-02-21 21:25 ` [PATCH v1 06/11] landlock: Add support for file reparenting with LANDLOCK_ACCESS_FS_REFER Mickaël Salaün
2022-02-22 3:16 ` kernel test robot
2022-02-22 10:18 ` Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-03-17 12:04 ` Mickaël Salaün
2022-03-17 21:42 ` Paul Moore
2022-03-24 10:31 ` Mickaël Salaün
2022-02-21 21:25 ` [PATCH v1 07/11] selftest/landlock: Add 6 new test suites dedicated to file reparenting Mickaël Salaün
2022-02-21 21:25 ` [PATCH v1 08/11] samples/landlock: Add support for " Mickaël Salaün
2022-03-17 1:26 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 09/11] landlock: Document LANDLOCK_ACCESS_FS_REFER and ABI versioning Mickaël Salaün
2022-03-17 1:27 ` Paul Moore
2022-03-17 12:06 ` Mickaël Salaün
2022-02-21 21:25 ` [PATCH v1 10/11] landlock: Document good practices about filesystem policies Mickaël Salaün
2022-03-17 1:27 ` Paul Moore
2022-02-21 21:25 ` [PATCH v1 11/11] landlock: Add design choices documentation for filesystem access rights Mickaël Salaün
2022-03-17 1:27 ` Paul Moore
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