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SubjectRe: [PATCH] ELF: implement AT_RANDOM for future glibc use
On Mon, Oct 06, 2008 at 09:26:41PM +0200, Andi Kleen wrote:
> > We're already using get_random* for stack, heap, and brk. Also,
> > get_random* uses the nonblocking pool, so this is the same as if userspace
> > had tried to pull bytes out of /dev/urandom, which (as I understand it)
>
> Yes exactly that's the problem. Think about it: do you really
> need the same cryptographic strength for your mmap placement
> as you need for your SSL session keys?
>
> And if you need true entropy for your session keys do you
> still get it when it was all used for low security
> purposes first?

Off-list I was just shown random32(). If AT_RANDOM used that instead,
would that be acceptable?

--
Kees Cook
Ubuntu Security Team


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