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Re: [linux-cifs-client] oops in khelper [message #23008] Fri, 09 November 2007 12:31 Go to next message
vaverin is currently offline  vaverin
Messages: 708
Registered: September 2005
Senior Member
Jeff Layton wrote:
> On Fri, 09 Nov 2007 14:17:38 +0300
> Vasily Averin <vvs@sw.ru> wrote:
> 
>> Hello Steve,
>>
>> Could you please take a look at the following oops? It looks like it
>> is related to cifs:
>> 1) Code line is corrupted (21 byte?!?), It looks like part of CIFS
>> smb_hdr with CIFS magic:
>>  00 00 50 ff 53 4d 42 32 00 00 00 00 80 41 c0 <00> 00 00 00 00 00
>>           FF S  M  B
> 
> Looks like the random memory corruption I was chasing around a month
> ago. It's a nasty bug. This patch from the cifs-2.6 git tree will
> probably fix it:
> 
> commit c18c732ec6bf372aa959ca6534cbfc32e464defd
> Author: Steve French <sfrench@us.ibm.com>
> Date:   Wed Oct 17 18:01:11 2007 +0000
> 
>     [CIFS] fix bad handling of EAGAIN error on kernel_recvmsg in cifs_demultiplex_thread

Jeff,
thank you for this hint.
However I would pay your attention that our kernel is based on RHEL4, and
obviously it is vulnerabled too.

thank you,
	Vasily Averin
Re: [linux-cifs-client] oops in khelper [message #23084 is a reply to message #23008] Fri, 09 November 2007 12:55 Go to previous message
Jeff Layton is currently offline  Jeff Layton
Messages: 4
Registered: November 2007
Junior Member
On Fri, 09 Nov 2007 15:31:12 +0300
Vasily Averin <vvs@sw.ru> wrote:

> Jeff Layton wrote:
> > On Fri, 09 Nov 2007 14:17:38 +0300
> > Vasily Averin <vvs@sw.ru> wrote:
> > 
> >> Hello Steve,
> >>
> >> Could you please take a look at the following oops? It looks like
> >> it is related to cifs:
> >> 1) Code line is corrupted (21 byte?!?), It looks like part of CIFS
> >> smb_hdr with CIFS magic:
> >>  00 00 50 ff 53 4d 42 32 00 00 00 00 80 41 c0 <00> 00 00 00 00 00
> >>           FF S  M  B
> > 
> > Looks like the random memory corruption I was chasing around a month
> > ago. It's a nasty bug. This patch from the cifs-2.6 git tree will
> > probably fix it:
> > 
> > commit c18c732ec6bf372aa959ca6534cbfc32e464defd
> > Author: Steve French <sfrench@us.ibm.com>
> > Date:   Wed Oct 17 18:01:11 2007 +0000
> > 
> >     [CIFS] fix bad handling of EAGAIN error on kernel_recvmsg in
> > cifs_demultiplex_thread
> 
> Jeff,
> thank you for this hint.
> However I would pay your attention that our kernel is based on RHEL4,
> and obviously it is vulnerabled too.
> 
> thank you,
> 	Vasily Averin

Yep. It's already been patched for RHEL 4.6 and 5.1.

-- 
Jeff Layton <jlayton@redhat.com>
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