linux-kernel - Re: [PATCH 3.19 091/123] gadgetfs: use-after-free in ->aio

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Message-ID: <20150325110825.GA23629@kroah.com>
Date:	Wed, 25 Mar 2015 12:08:25 +0100
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Alexander Holler <holler@...oftware.de>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 3.19 091/123] gadgetfs: use-after-free in ->aio_read()

On Wed, Mar 25, 2015 at 11:58:46AM +0100, Alexander Holler wrote:
> Am 25.03.2015 um 11:15 schrieb Greg Kroah-Hartman:
> >On Wed, Mar 25, 2015 at 10:23:27AM +0100, Alexander Holler wrote:
> >>Am 25.03.2015 um 09:33 schrieb Greg Kroah-Hartman:
> 
> >>>Is there a specific patch that is in Linus's tree that fixes this issue
> >>>that I should be applying to the stable tree?
> >>
> >>No specific one. The changes of this patch were discarded by other patches
> >>in Linus tree which fixed other problems of gadgetfs too.
> >>
> >>Besides that the solution for this one specific patch is a one-liner, I'll
> >>give a short overview:
> >>
> >>- gadgetfs is already unusable since 3.16 (even with this patch) because
> >>(p)read/(p)write doesn't work (fixed with 4.0)
> >>- the problem this patch fixes is unlikely to be hit because glibc doesn't
> >>use the Linux aio-syscall, but pread/pwrite, which means someone has to use
> >>a special lib and not aio(7) to end up at the syscall the patch in question
> >>fixes.
> >>- there aren't that many users of gadgetfs
> >>
> >>No idea if you want to apply or backport the whole series found in Al Viros
> >>vfs.git/gadgetfs.
> >
> >As this has been broken since 3.16, and no one has taken the time to fix
> >it since then, it's not really an issue here, people can just use 4.0 if
> >they want it.
> 
> Just a hint I think which should be kept in mind: Debian still uses
> something below 3.16, which very likely is the reason why nobody has hit
> (and examined) these bugs before.

Not all the world is Debian :)
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