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Message-ID: <1426517419.28068.118.camel@stgolabs.net>
Subject: Re: [PATCH] mm: rcu-protected get_mm_exe_file()
From: Davidlohr Bueso <dave@stgolabs.net>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>, linux-mm@kvack.org,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 16 Mar 2015 07:50:19 -0700
In-Reply-To: <20150316140720.GA1859@redhat.com>
References: <20150316131257.32340.36600.stgit@buzz>
	 <20150316140720.GA1859@redhat.com>
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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.