Re: [CHECKER] large stack variables (>=1K) in 2.4.4 and 2.4.4-ac8
Andi Kleen (email@example.com)
Fri, 25 May 2001 16:07:29 +0200
On Fri, May 25, 2001 at 04:03:57PM +0200, Oliver Neukum wrote:
> > A small overflow of the kernel stack overwrites the struct task at the
> > bottom of the stack, recovery is dubious at best because we rely on
> > data in struct task. A large overflow of the kernel stack either
> > corrupts the storage below this task's stack, which could hit anything,
> > or it gets a stack fault.
> Is there a reason for the task structure to be at the bottom rather than the
> top of these two pages ?
This way you save one addition for every current access; which adds to
quite a few KB over the complete kernel.
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