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

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Message-ID: <48E65964.5020809@redhat.com>
Date:	Fri, 03 Oct 2008 10:41:56 -0700
From:	Ulrich Drepper <drepper@...hat.com>
To:	Kees Cook <kees.cook@...onical.com>
CC:	Jakub Jelinek <jakub@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	linux-kernel@...r.kernel.org, libc-alpha@...rceware.org
Subject: Re: [PATCH] ELF: implement AT_RANDOM for glibc PRNG seeding

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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.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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