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

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Message-ID: <20081003145754.GH32682@tyan-ft48-01.lab.bos.redhat.com>
Date:	Fri, 3 Oct 2008 16:57:54 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Kees Cook <kees.cook@...onical.com>
Cc:	Ulrich Drepper <drepper@...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

On Fri, Oct 03, 2008 at 07:50:54AM -0700, Kees Cook wrote:
> @@ -152,6 +160,8 @@ create_elf_tables(struct linux_binprm *bprm, struct elfhdr *exec,
>  	elf_addr_t __user *sp;
>  	elf_addr_t __user *u_platform;
>  	elf_addr_t __user *u_base_platform;
> +	elf_addr_t __user *u_rand_bytes;
> +	unsigned int rand_size;
>  	const char *k_platform = ELF_PLATFORM;
>  	const char *k_base_platform = ELF_BASE_PLATFORM;
>  	int items;

Why are you introducing the rand_size variable at all?  The only thing it
can cause is confuse somebody to change it, which might do bad things as
k_rand_bytes var uses ELF_AUXV_RANDOM_SIZE directly.  Just use
ELF_AUXV_RANDOM_SIZE in all places you use rand_size ATM (except the
assignment and declaration of course).

	Jakub
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