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Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding

From: Ulrich Drepper <drepper at redhat dot com>
To: Kees Cook <kees dot cook at canonical dot com>
Cc: Jakub Jelinek <jakub at redhat dot com>, Arjan van de Ven <arjan at infradead dot org>, Roland McGrath <roland at redhat dot com>, linux-kernel at vger dot kernel dot org, libc-alpha at sourceware dot org
Date: Fri, 03 Oct 2008 10:41:56 -0700
Subject: Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding
References: <20081001215657.GH12527@outflux.net> <20081001220948.GC32107@sunsite.ms.mff.cuni.cz> <20081001222706.68E7E1544B4@magilla.localdomain> <20081003001616.GN10632@outflux.net> <20081003004340.GF32682@tyan-ft48-01.lab.bos.redhat.com> <20081003052938.GS10632@outflux.net> <20081002225718.6a0d803a@infradead.org> <48E5BAC6.9070007@redhat.com> <20081003145054.GU10632@outflux.net> <20081003145754.GH32682@tyan-ft48-01.lab.bos.redhat.com> <20081003173313.GW10632@outflux.net>

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Kees Cook wrote:
> +#ifndef ELF_AUXV_RANDOM_SIZE
> +/*
> + * AT_RANDOM provides 16 random bytes which can be used to seed
> + * userspace PRNGs at program load time.
> + */
> +#define ELF_AUXV_RANDOM_SIZE 16
> +#endif

No, this cannot be changeable because there is no way for userland to
find out the size.  And no, don't reintroduce the the extra aux vector
entry.  Just define it to 16 and that's it.

- --
â Ulrich Drepper â Red Hat, Inc. â 444 Castro St â Mountain View, CA â
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Follow-Ups:
- [PATCH v5] ELF: implement AT_RANDOM for glibc PRNG seeding
  - From: Kees Cook

References:
- Re: randomized stack protector value
  - From: Kees Cook
- Re: randomized stack protector value
  - From: Jakub Jelinek
- Re: randomized stack protector value
  - From: Roland McGrath
- [PATCH] ELF: implement AT_RANDOM for future glibc use
  - From: Kees Cook
- Re: [PATCH] ELF: implement AT_RANDOM for future glibc use
  - From: Jakub Jelinek
- [PATCH] ELF: implement AT_RANDOM for future glibc use
  - From: Kees Cook
- Re: [PATCH] ELF: implement AT_RANDOM for future glibc use
  - From: Arjan van de Ven
- Re: [PATCH] ELF: implement AT_RANDOM for future glibc use
  - From: Ulrich Drepper
- [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding
  - From: Kees Cook
- Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding
  - From: Jakub Jelinek
- [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding
  - From: Kees Cook

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