Re: [PATCH] ELF: implement AT_RANDOM for future glibc use | KernelTrap

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use

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From: Kees Cook <kees.cook@...>

To: Andi Kleen <andi@...>

Cc: Roland McGrath <roland@...>, <linux-kernel@...>, Jakub Jelinek <jakub@...>, Ulrich Drepper <drepper@...>, <libc-alpha@...>

Subject: Re: [PATCH] ELF: implement AT_RANDOM for future glibc use

Date: Monday, October 6, 2008 - 6:07 pm

On Mon, Oct 06, 2008 at 09:26:41PM +0200, Andi Kleen wrote:
quoted text> > 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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Messages in current thread:

[PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Thu Oct 2, 8:16 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 2:00 am)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 1:50 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 3:26 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 6:07 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Mon Oct 6, 7:58 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 8:31 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 8:57 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 9:44 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 9:51 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 8:08 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 7:28 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 6:01 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 7:19 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 7:29 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 7:44 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Thu Oct 2, 8:52 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Fri Oct 3, 1:15 am)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Fri Oct 3, 4:22 pm)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Jakub Jelinek, (Thu Oct 2, 8:43 pm)

[PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Fri Oct 3, 1:29 am)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Arjan van de Ven, (Fri Oct 3, 1:57 am)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Fri Oct 3, 2:25 am)

[PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 10:50 am)

Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Jakub Jelinek, (Fri Oct 3, 10:57 am)

[PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 1:33 pm)

Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Fri Oct 3, 1:41 pm)

[PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 1:59 pm)

Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Andrew Morton, (Tue Oct 21, 4:01 pm)

Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Tue Oct 21, 4:22 pm)

Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Andrew Morton, (Mon Oct 27, 1:46 am)

Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Sat Oct 18, 1:42 am)

Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Fri Oct 3, 10:56 am)

Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Fri Oct 3, 1:25 am)

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