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exploiting overflowed kmalloc() memory?



has anyone done any research on exploiting overflows with memory returned by 
kmalloc()?  after briefly looking at source, i see that internally it relies on 
the kmem_cache_alloc() functions.  i didn't see any sort of coalescing as with 
dlmalloc, so maybe it's not even possible?  anyone have any links/info about 
this?