linux-kernel - Re: [PATCH] proc: make proc_fd

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Message-ID: <CA+55aFzCghYYF1_dcvBY9XZ82TU9b=hhgFqkGoWpaZuKJ7R6_A@mail.gmail.com>
Date:	Mon, 26 Aug 2013 11:09:25 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, Al Viro <viro@...iv.linux.org.uk>,
	Andy Lutomirski <luto@...capital.net>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Brad Spengler <spender@...ecurity.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] proc: make proc_fd_permission() thread-friendly

On Mon, Aug 26, 2013 at 10:54 AM, Oleg Nesterov <oleg@...hat.com> wrote:
> proc_fd_permission() says "process can still access /proc/self/fd
> after it has executed a setuid()", but the "task_pid() = proc_pid()
> check only helps if the task is group leader, /proc/self points to
> /proc/leader-pid.

Patch looks ok to me, but since this has never worked and nobody has
actually complained, I can't really convince myself that this is
critical.

So I'm not going to apply it for 3.11, and it had better wait for the
next merge window.

                 Linus
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