Re: OOPS in perf_mmap_close()

[Vince Weaver]

On Tue, 28 May 2013, Vince Weaver wrote:

> It looks like this is already in tip, but I can confirm that this 
> patch seems to fix things on my machine and holds up against longer 
> fuzzing runs.

OK, I take it back.  Even with the new patch applied, my fuzzer can still 
make the kernel leak user->locked_vm

I assume that the locked_vm value should go back to 0 once a process that 
has a bunch of mmap'd perf_events opened exits?

I admit this is sort of an obscure corner case, but it does mean that a 
user can leak user->locked_vm to the point that "perf record" no longer 
works.

Vince
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/