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

[J. Bruce Fields]

On Mon, Sep 28, 2015 at 06:25:23PM +0200, Andreas GrÃnbacher wrote:
> 2015-09-28 18:08 GMT+02:00 J. Bruce Fields <bfields@xxxxxxxxxxxx>:
> > 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?

Sorry, I meant "unix user", not "unix group"!

--b.
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