linux-kernel - Re: [PATCH v2] vfs: Tighten up linkat(..., AT_EMPTY

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Message-ID: <CALCETrVVwWaQLL21u5y_c6cWN4QD75tm96DiJfxHQvvgbNDwNg@mail.gmail.com>
Date:	Mon, 26 Aug 2013 11:11:04 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>, Willy Tarreau <w@....eu>,
	"security@...nel.org" <security@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Brad Spengler <spender@...ecurity.net>
Subject: Re: [PATCH v2] vfs: Tighten up linkat(..., AT_EMPTY_PATH)

On Mon, Aug 26, 2013 at 11:07 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
> On Mon, Aug 26, 2013 at 10:37 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> I'm playing with a patch that then in addition to the ptrace check
>> *also* requires that the file was opened with the same credentials as
>> the follower _or_ the task being followed. I'll see if that works out.
>
> Chrome sandboxing still _works_ with the attached patch, but there's a
> few audit messages about the sandbox being denied dac_read_search. And
> I'm really not very happy with this anyway.
>
> So I'm going to send it out (using email to archive things and see if
> anybody has any comments), and then forget about it.
>

I'm still not thrilled with this approach.  I'll see if I can find a
clean way to use fmode later today.

--Andy

>                   Linus



-- 
Andy Lutomirski
AMA Capital Management, LLC
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