linux-kernel - Re: [PATCH 1/2] vfs: implement fchmodat2() syscall

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Message-ID: <02954403-b546-0afe-39c7-23b7b05dece2@redhat.com>
Date:   Tue, 11 Apr 2017 12:55:51 -0500
From:   Eric Blake <eblake@...hat.com>
To:     Colin Walters <walters@...bum.org>, Greg Kurz <groug@...d.org>,
        viro@...iv.linux.org.uk
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] vfs: implement fchmodat2() syscall

On 04/11/2017 12:52 PM, Colin Walters wrote:
> 
> 
> On Tue, Feb 28, 2017, at 02:23 PM, Eric Blake wrote:
> 
>> 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
> 
> 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.


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



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