Re: [PATCH] slub: Potential stack overflow

[Eric Dumazet]

Le mercredi 24 mars 2010 Ã 14:16 -0500, Christoph Lameter a Ãcrit :
> On Wed, 24 Mar 2010, Eric Dumazet wrote:
> 
> > I discovered that we can overflow stack if CONFIG_SLUB_DEBUG=y and use
> > slabs with many objects, since list_slab_objects() and process_slab()
> > use DECLARE_BITMAP(map, page->objects);
> 
> Maybe we better allocate the bitmap via kmalloc then.
> 

Hmm...

Are we allowed to nest in these two functions ?

GFP_KERNEL, GFP_ATOMIC ?

These are debugging functions, what happens if kmalloc() returns NULL ?



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