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

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From: Kees Cook <kees.cook@...>
To: Ulrich Drepper <drepper@...>
Cc: Roland McGrath <roland@...>, Andi Kleen <andi@...>, <linux-kernel@...>, Jakub Jelinek <jakub@...>, <libc-alpha@...>
Subject: Re: [PATCH] ELF: implement AT_RANDOM for future glibc use
Date: Monday, October 6, 2008 - 9:44 pm

On Mon, Oct 06, 2008 at 05:57:48PM -0700, Ulrich Drepper wrote:

As was suspected, each int is the same.


I meant based on what was said about "if it's as strong as the ASLR
randomness, it's good enough for this".  While the ultimate solution
would be to bolt a better PRNG into the kernel, is the following good
enough for now for glibc:

$ ./rands
0x2b 0x06 0xb7 0x53 0x2b 0x06 0xb7 0x53 0x2b 0x06 0xb7 0x53 0x2b 0x06 0xb7 0x53
$ ./rands
0xc2 0xb5 0x42 0xdc 0xc2 0xb5 0x42 0xdc 0xc2 0xb5 0x42 0xdc 0xc2 0xb5 0x42 0xdc
$ ./rands
0x5f 0x39 0xc6 0xc0 0x5f 0x39 0xc6 0xc0 0x5f 0x39 0xc6 0xc0 0x5f 0x39 0xc6 0xc0
$ ./rands
0xfb 0x4a 0x82 0xbd 0xfb 0x4a 0x82 0xbd 0xfb 0x4a 0x82 0xbd 0xfb 0x4a 0x82 0xbd

-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, 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)