Re: + sys_getppid-oopses-on-debug-kernel.patch added to -mm tree

[Muli Ben-Yehuda <muli@il.ibm.com>]

On Tue, Aug 08, 2006 at 07:32:51AM -0700, akpm@osdl.org wrote:
> 
> The patch titled
> 
>      sys_getppid() oopses on debug kernel
> 
> has been added to the -mm tree.  Its filename is
> 
>      sys_getppid-oopses-on-debug-kernel.patch
> 
> See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
> out what to do about this
> 
> ------------------------------------------------------
> Subject: sys_getppid() oopses on debug kernel
> From: Kirill Korotaev <dev@sw.ru>
> 
> sys_getppid() optimization can access a freed memory.  On kernels with
> DEBUG_SLAB turned ON, this results in Oops.
> 
> Signed-off-by: Kirill Korotaev <dev@openvz.org>
> Cc: <stable@kernel.org>
> Signed-off-by: Andrew Morton <akpm@osdl.org>

I'm probably missing something, but is it really valid to access freed
kernel memory even if CONFIG_DEBUG_SLAB is off - as this patch does?

Cheers,
Muli