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To: Michael Tokarev <mjt@tls.msk.ru>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: personality(ADDR_LIMIT_3GB) results in EFAULT
From: Andi Kleen <andi@firstfloor.org>
References: <4BFEA911.40600@msgid.tls.msk.ru>
Date: Thu, 27 May 2010 20:38:19 +0200
In-Reply-To: <4BFEA911.40600@msgid.tls.msk.ru> (Michael Tokarev's message of "Thu\, 27 May 2010 21\:17\:05 +0400")
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Michael Tokarev <mjt@tls.msk.ru> writes:

> I noticed an.. interesting issue here.
>
> Running a 32bit executable on a 64bit kernel,
> and doing
>
>   personality(ADDR_LIMIT_3GB);
>
> That call succedes, but any further execve()
> and friends results in EFAULT, unless whole
> argv[] and envp[] are copied to a malloc'ed
> space.  alloca sometimes helps and sometimes
> not.

It worked when I wrote it originally.

Sounds like a regression, perhaps related to
b6a2fea39318e43fee84fa7b0b90d68bed92d2ba


-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.