From: Nigel Stephens <nigel@mips.com>
To: Franck <vagabon.xyz@gmail.com>
Cc: Ralf Baechle <ralf@linux-mips.org>,
linux-mips <linux-mips@linux-mips.org>
Subject: Re: [RFC] User stack pointer randomisation
Date: Thu, 19 Jul 2007 10:43:03 +0100 [thread overview]
Message-ID: <469F3227.6090307@mips.com> (raw)
In-Reply-To: <469F0E5F.4050005@innova-card.com>
Franck Bui-Huu wrote:
> +/*
> + * Don't forget that the stack pointer must be aligned on a 8 bytes
> + * boundary at least.
> + */
> +unsigned long arch_align_stack(unsigned long sp)
> +{
> + if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
> + sp -= get_random_int() & ~PAGE_MASK;
> +
> + return sp & ~7;
> +}
>
For the 64-bit ABIs (N32 & N64) the stack must be 16 byte aligned.
Nigel
next prev parent reply other threads:[~2007-07-19 9:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-19 7:10 [RFC] User stack pointer randomisation Franck Bui-Huu
2007-07-19 9:43 ` Nigel Stephens [this message]
2007-07-19 11:36 ` Franck Bui-Huu
2007-07-19 11:14 ` Ralf Baechle
2007-07-19 11:47 ` Franck Bui-Huu
2007-07-19 12:01 ` Ralf Baechle
2007-07-19 12:19 ` Franck Bui-Huu
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