Re: [PATCH] Use MM_VM_SIZE in exit_mmap

[Andi Kleen]

Anton Blanchard <anton@xxxxxxxxx> 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
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