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SubjectRe: [PATCH] mm: Add additional consistency check
On Fri, 31 Mar 2017, Kees Cook wrote:

> As found in PaX, this adds a cheap check on heap consistency, just to
> notice if things have gotten corrupted in the page lookup.

Ok this only affects kmem_cache_free() and not kfree(). For
kmem_cache_free() we already have a lot of stuff in the hotpath due to
cgruops. If you want this also for kfree() then we need a separate patch.

Also for kmem_cache_free(): Here we always have a slab cache and thus we
could check the flags that could modify what behavior we want.

Acked-by: Christoph Lameter <>

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