linux-ext4 - Re: [PATCH v8 10/41] richacl: Permission check algorithm

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Date:	Mon, 28 Sep 2015 18:25:23 +0200
From:	Andreas Grünbacher <andreas.gruenbacher@...il.com>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Andreas Gruenbacher <agruenba@...hat.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	"Theodore Ts'o" <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jeff Layton <jlayton@...chiereds.net>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Anna Schumaker <anna.schumaker@...app.com>,
	linux-ext4@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux FS-devel Mailing List <linux-fsdevel@...r.kernel.org>,
	Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
	Linux API Mailing List <linux-api@...r.kernel.org>
Subject: Re: [PATCH v8 10/41] richacl: Permission check algorithm

2015-09-28 18:08 GMT+02:00 J. Bruce Fields <bfields@...ldses.org>:
> On Mon, Sep 28, 2015 at 12:09:01AM +0200, Andreas Gruenbacher wrote:
>> +     /*
>> +      * Check if the acl grants the requested access and determine which
>> +      * file class the process is in.
>> +      */
>> +     richacl_for_each_entry(ace, acl) {
>> +             unsigned int ace_mask = ace->e_mask;
>> +
>> +             if (richace_is_inherit_only(ace))
>> +                     continue;
>> +             if (richace_is_owner(ace)) {
>> +                     if (!uid_eq(current_fsuid(), inode->i_uid))
>> +                             continue;
>> +                     goto entry_matches_owner;
>> +             } else if (richace_is_group(ace)) {
>> +                     if (!in_owning_group)
>> +                             continue;
>> +             } else if (richace_is_unix_user(ace)) {
>> +                     if (!uid_eq(current_fsuid(), ace->e_id.uid))
>> +                             continue;
>> +                     goto entry_matches_owner;
>> +             } else if (richace_is_unix_group(ace)) {
>> +                     if (!in_group_p(ace->e_id.gid))
>> +                             continue;
>> +             } else
>> +                     goto entry_matches_everyone;
>> +
>> +             /*
>> +              * Apply the group file mask to entries other than owner@ and
>> +              * everyone@ or user entries matching the owner.
>
> The above also skips the following group_mask application on any unix
> group.

Really? How does it do that?

Thanks,
Andreas
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