Re: [PATCH] ptrace RSE bug

From: Petr Tesarik <ptesarik_at_suse.cz>
Date: 2007-10-18 05:48:47
Petr Tesarik wrote:
>[...]
>   4. While talking about RNAT, does the RBS syncing back and forth
> handle correctly the case when part of the RNAT stored in the backing
> store belongs to the kernel registers? It must not be possible to change
> the NAT bits for kernel registers from userspace!
> 
>      Maybe it's not an issue, because I tried to actually exploit this
> bug, and my attempts failed.

I've just verified that put_rnat() does the right thing here (even
prevents setting NaT for syscall arguments), so modifying RNAT bits is
no problem. The other things still apply.

Regards,
Petr Tesarik
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Received on Thu Oct 18 05:46:43 2007

This archive was generated by hypermail 2.1.8 : 2007-10-18 05:46:58 EST