linux-kernel - Re: [PATCH 2/2] exec: copy-and-paste the fixes into compat_do

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Date:	Wed,  1 Dec 2010 12:04:33 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, pageexec@...email.hu,
	Solar Designer <solar@...nwall.com>,
	Eugene Teo <eteo@...hat.com>,
	Brad Spengler <spender@...ecurity.net>,
	Roland McGrath <roland@...hat.com>, stable@...nel.org
Subject: Re: [PATCH 2/2] exec: copy-and-paste the fixes into compat_do_execve() paths

> Note: this patch targets 2.6.37 and tries to be as simple as possible.
> That is why it adds more copy-and-paste horror into fs/compat.c and
> uglifies fs/exec.c, this will be cleanuped later.
> 
> compat_copy_strings() plays with bprm->vma/mm directly and thus has
> two problems: it lacks the RLIMIT_STACK check and argv/envp memory
> is not visible to oom killer.
> 
> Export acct_arg_size() and get_arg_page(), change compat_copy_strings()
> to use get_arg_page(), change compat_do_execve() to do acct_arg_size(0)
> as do_execve() does.
> 
> Add the fatal_signal_pending/cond_resched checks into compat_count() and
> compat_copy_strings(), this matches the code in fs/exec.c and certainly
> makes sense.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>

Looks good to me.
	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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