On Fri, Aug 21, 2015 at 02:06:16PM -0700, H. Peter Anvin wrote:
> What I'm saying is that we do do STAC, which *disables* SMAP. We have
> to do that because one pointer is known to be a user space pointer.
>
> However, we currently don't verify that the *other* pointer is kernel
> space, which it is supposed to be (if not, we should be using
> copy_in_user). We have to do this manually since we have to STAC which
> means SMAP doesn't do anything at all. I believe it would be a good
> idea to add such checks (and they would even benefit non-SMAP hardware.)
Ah, ok, so we're on the same page.
And yep, Linus gave the probe_kernel_read() suggestion in another mail.
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Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284
(AG Nürnberg)
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