From: Andi Kleen <ak@muc.de>
To: Anton Blanchard <anton@samba.org>
Cc: linux-kernel@vger.kernel.org, spyro@f2s.com
Subject: Re: [PATCH] Use MM_VM_SIZE in exit_mmap
Date: Wed, 26 Jan 2005 07:44:24 +0100 [thread overview]
Message-ID: <m1zmyw4rlj.fsf@muc.de> (raw)
In-Reply-To: <20050125142210.GI5920@krispykreme.ozlabs.ibm.com> (Anton Blanchard's message of "Wed, 26 Jan 2005 01:22:10 +1100")
Anton Blanchard <anton@samba.org> writes:
>
> It is possible for one task to end up "owning" an mm from another - we
> have seen this with the procfs code when process 1 accesses
> /proc/pid/cmdline of process 2 while it is exiting. Process 2 exits
> but does not tear its mm down. Later on process 1 finishes with the proc
> file and the mm gets torn down at this point.
IMHO that's the root bug. That sounds really dangerous and will likely
cause other problems because it is totally unexpected. How about fixing
/proc to not do this?
-Andi
next prev parent reply other threads:[~2005-01-26 6:44 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-25 14:22 [PATCH] Use MM_VM_SIZE in exit_mmap Anton Blanchard
2005-01-25 16:46 ` Chris Wedgwood
2005-01-25 16:57 ` Anton Blanchard
2005-01-25 17:13 ` Chris Wedgwood
2005-01-27 20:46 ` [PATCH RFC] Change (some) TASK_SIZE to task_vtop(current) Chris Wedgwood
2005-01-25 23:02 ` [PATCH] Use MM_VM_SIZE in exit_mmap Ian Molton
2005-01-25 23:39 ` Russell King
2005-01-26 0:01 ` Anton Blanchard
2005-01-26 0:17 ` Nick Piggin
2005-01-26 6:44 ` Andi Kleen [this message]
2005-01-26 7:39 ` William Lee Irwin III
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