linux-kernel - Re: [PATCH v2] tomoyo: Don't check open/getattr permission on sockets.

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Message-ID: <20190822070129.GL6111@zzz.localdomain>
Date:   Thu, 22 Aug 2019 00:01:29 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Al Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org,
        syzbot <syzbot+0341f6a4d729d4e0acf1@...kaller.appspotmail.com>,
        jmorris@...ei.org, linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org, serge@...lyn.com,
        syzkaller-bugs@...glegroups.com, takedakn@...data.co.jp,
        "David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH v2] tomoyo: Don't check open/getattr permission on
 sockets.

On Thu, Aug 22, 2019 at 03:55:31PM +0900, Tetsuo Handa wrote:
> Eric Biggers wrote:
> > What happened to this patch?
> 
> I have to learn how to manage a git tree for sending
> pull requests, but I can't find time to try.
> 
> > 
> > Also, isn't the same bug in other places too?:
> > 
> > 	- tomoyo_path_chmod()
> > 	- tomoyo_path_chown()
> > 	- smack_inode_getsecurity()
> > 	- smack_inode_setsecurity()
> 
> What's the bug? The file descriptor returned by open(O_PATH) cannot be
> passed to read(2), write(2), fchmod(2), fchown(2), fgetxattr(2), mmap(2) etc.
> 

chmod(2), chown(2), getxattr(2), and setxattr(2) take a path, not a fd.

- Eric