Re: [PATCH 14/35] mm: Introduce VM_SHADOW_STACK for shadow stack memory
From: Dave Hansen <hidden>
Date: 2022-02-09 21:56:10
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linux-arch, linux-doc, linux-mm, lkml
On 1/30/22 13:18, Rick Edgecombe wrote:
A shadow stack PTE must be read-only and have _PAGE_DIRTY set. However, read-only and Dirty PTEs also exist for copy-on-write (COW) pages. These two cases are handled differently for page faults. Introduce VM_SHADOW_STACK to track shadow stack VMAs.
This is also a very appropriate place to remind folks that VM_WRITE is mutually exclusive with this flag. That's pretty important.