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

From: Muli Ben-Yehuda
Date: Tue Aug 08 2006 - 10:37:17 EST

On Tue, Aug 08, 2006 at 07:32:51AM -0700, akpm@xxxxxxxx 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 to find
> out what to do about this
> ------------------------------------------------------
> Subject: sys_getppid() oopses on debug kernel
> From: Kirill Korotaev <dev@xxxxx>
> 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@xxxxxxxxxx>
> Cc: <stable@xxxxxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxx>

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?

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