Re: [RFC PATCH v3 12/24] x86/mm: Modify ptep_set_wrprotect and pmdp_set_wrprotect for _PAGE_DIRTY_SW
- From
- Dave Hansen <dave.hansen@linux.intel.com>
- Date
- 2018-08-30 17:36:18
- Also in
- linux-arch, linux-doc, linux-mm, lkml
- Reply to
- Yu-cheng Yu, 2018-08-30
On 08/30/2018 10:26 AM, Yu-cheng Yu wrote:
We don't have the guard page now, but there is a shadow stack token there, which cannot be used as a return address.
The overall concern is that we could overflow into a page that we did
not intend. Either another actual shadow stack or something that a page
that the attacker constructed, like the transient scenario Jann described.