linux-kernel - Re: [PATCH] mm: rcu-protected get_mm_exe

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Message-ID: <1426517419.28068.118.camel@stgolabs.net>
Date:	Mon, 16 Mar 2015 07:50:19 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] mm: rcu-protected get_mm_exe_file()

On Mon, 2015-03-16 at 15:07 +0100, Oleg Nesterov wrote:
> 	3. and we can remove down_write(mmap_sem) from prctl paths.
> 
> 	   Actually we can do this even without xchg() above, but we might
> 	   want to kill MMF_EXE_FILE_CHANGED and test_and_set_bit() check.

Yeah I was waiting for security folks input about this, otherwise this
still doesn't do it for me as we still have to deal with mmap_sem.

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