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Subject: Re: [PATCH 1/2] vfs: implement fchmodat2() syscall
To: Colin Walters <walters@verbum.org>, Greg Kurz <groug@kaod.org>,
        viro@zeniv.linux.org.uk
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 <99466bd0-48f2-1594-5392-5e6191d56ffa@redhat.com>
 <1491933162.45759.941552624.3722F8E8@webmail.messagingengine.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
From: Eric Blake <eblake@redhat.com>
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Date: Tue, 11 Apr 2017 12:55:51 -0500
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From: Eric Blake <eblake@redhat.com>
To: Colin Walters <walters@verbum.org>, Greg Kurz <groug@kaod.org>,
 viro@zeniv.linux.org.uk
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Message-ID: <02954403-b546-0afe-39c7-23b7b05dece2@redhat.com>
Subject: Re: [PATCH 1/2] vfs: implement fchmodat2() syscall
References: <148830142269.7103.7429913851447595016.stgit@bahia>
 <99466bd0-48f2-1594-5392-5e6191d56ffa@redhat.com>
 <1491933162.45759.941552624.3722F8E8@webmail.messagingengine.com>
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On 04/11/2017 12:52 PM, Colin Walters wrote:
>=20
>=20
> On Tue, Feb 28, 2017, at 02:23 PM, Eric Blake wrote:
>=20
>> Might also be worth mentioning that this patch is required in order to=

>> solve CVE-2016-9602, per discussion at
>> https://lists.gnu.org/archive/html/qemu-devel/2017-02/msg06089.html
>=20
> I only briefly looked at this, but can't `open(..., O_PATH)` be used to=
 solve
> this today?

O_PATH was the fallback that qemu used - but that's non-POSIX, which
means we have to have a different solution for POSIX systems than for
Linux systems, while waiting for Linux to catch up to POSIX.


--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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