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

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From: Kees Cook
Subject: Re: [PATCH] ELF: implement AT_RANDOM for future glibc use
Date: Thursday, October 2, 2008 - 10:15 pm

On Thu, Oct 02, 2008 at 05:52:58PM -0700, Roland McGrath wrote:

Out of curiosity, why are there gaps?  I figure I can include some
comments in that header to explain the gaps for future AT_* creations.


I was trying to make the size compile-time static so I could avoid
kmalloc'ing a buffer for get_random_bytes().  But maybe avoid that isn't
sensible?

As for 16 bytes on both 32bit and 64bit, I was aiming to have 4
pointer-sized random values.  16 works for 32bit, but I was hoping to
have 32 on 64bit.  Perhaps I am over-estimating?

-Kees

-- 
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, 5:16 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Jakub Jelinek, (Thu Oct 2, 5:43 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Thu Oct 2, 5:52 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Thu Oct 2, 10:15 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Thu Oct 2, 10:25 pm)
[PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Thu Oct 2, 10:29 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Arjan van de Ven, (Thu Oct 2, 10:57 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Thu Oct 2, 11:25 pm)
[PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 7:50 am)
Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Fri Oct 3, 7:56 am)
Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Jakub Jelinek, (Fri Oct 3, 7:57 am)
[PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 10:33 am)
Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Fri Oct 3, 10:41 am)
[PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Kees Cook, (Fri Oct 3, 10:59 am)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Fri Oct 3, 1:22 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Sun Oct 5, 11:00 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 10:50 am)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 12:26 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 3:01 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 3:07 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 4:19 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 4:28 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 4:29 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Andi Kleen, (Mon Oct 6, 4:44 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Roland McGrath, (Mon Oct 6, 4:58 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 5:08 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 5:31 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 5:57 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Kees Cook, (Mon Oct 6, 6:44 pm)
Re: [PATCH] ELF: implement AT_RANDOM for future glibc use, Ulrich Drepper, (Mon Oct 6, 6:51 pm)
Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Fri Oct 17, 10:42 pm)
Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Andrew Morton, (Tue Oct 21, 1:01 pm)
Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Ulrich Drepper, (Tue Oct 21, 1:22 pm)
Re: [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding, Andrew Morton, (Sun Oct 26, 10:46 pm)