cvs commit: src/sys/vm vm_map.c
tjr at freebsd.org
Tue Mar 23 02:52:59 PST 2004
On Tue, Mar 23, 2004 at 11:33:00AM +0100, Pawel Jakub Dawidek wrote:
> On Tue, Mar 23, 2004 at 12:37:35AM -0800, Tim J. Robbins wrote:
> +> tjr 2004/03/23 00:37:34 PST
> +> FreeBSD src repository
> +> Modified files:
> +> sys/vm vm_map.c
> +> Log:
> +> Do not copy vm_exitingcnt to the new vmspace in vmspace_exec(). Copying
> +> it led to impossibly high values in the new vmspace, causing it to never
> +> drop to 0 and be freed.
> How serious it is? Do you planning to MFC it to RELENG_4 with peter@'s
> patch of course?
A user can cause the kernel to allocate an unbounded amount of wired
memory, causing the machine to panic or stop responding. It's been observed
to happen under real workloads; that is, the circumstances are not so
contrived that the bug could only be caused by a malicious user.
I don't have any immediate plans to MFC it (I don't have any 4.x systems
right now), but peter@ or ps@ may want to after letting it settle for a
while in -current.
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