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SubjectRe: [patch] avoid unaligned access when accessing poll stack
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On Saturday 01 April 2006 04:35, Mitchell Blank Jr wrote:

> * I also changed "size" to be unsigned since that makes more sense and
> is less prone to overflow bugs. I'm also a little scared by the
> "kmalloc(6 * size)" since that type of call is a classic multiply-overflow
> security hole (hence libc's calloc() API). However "size" is constrained
> by fdt->max_fdset so I think it isn't exploitable. The kernel doesn't
> have an overflow-safe API for kmalloc'ing arrays, does it?

kcalloc. But it's slow since it memsets.

-Andi

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