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Message-ID: <AANLkTimRwif7c-YXVTLzdo00M1KvfJLP8IMqz7URfGTn@mail.gmail.com>
Date: Fri, 9 Jul 2010 21:44:20 -0400
From: Dan Rosenberg <dan.j.rosenberg@...il.com>
To: akuster <akuster@...sta.com>
Cc: oss-security@...ts.openwall.com
Subject: Re: kernel: gfs2 acl issue
Kernels prior to 2.6.32 are not vulnerable.
-Dan
On Fri, Jul 9, 2010 at 1:48 PM, akuster <akuster@...sta.com> wrote:
> Dan,
>
> Is 2.6.32 the earliest kernel showing the problem or just what was tested?
>
> Regards,
> Armin
>
> On 07/08/2010 05:56 PM, Dan Rosenberg wrote:
>> To elaborate on the issue: the gfs2 filesystem in 2.6.32 kernels
>> currently allows any user to set arbitrary ACLs for files they do not
>> own, essentially granting full access to everything. The source of
>> this problem also caused other misbehavior of ACLs. This fix resolved
>> the issue for 2.6.33, but it was not backported, so 2.6.32 remains
>> vulnerable.
>>
>> -Dan
>>
>> On Thu, Jul 8, 2010 at 11:47 PM, Eugene Teo <eugeneteo@...nel.sg> wrote:
>>> Upstream commit 2646a1f6 (2.6.33-rc1) fixed an interesting gfs2 acl issue
>>> late last year. Thanks Dan Rosenberg for informing us about this.
>>>
>>> http://git.kernel.org/linus/2646a1f61a3b5525914757f10fa12b5b94713648
>>>
>>> I didn't request a CVE name for this but if you need one, ping Steve.
>>>
>>> Thanks, Eugene
>>> --
>>> main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }
>>>
>
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