Re: [PATCH v7 22/41] mm/mmap: Add shadow stack pages to memory accounting
From: "Edgecombe, Rick P" <rick.p.edgecombe@intel.com>
Date: 2023-03-06 18:13:52
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On Mon, 2023-03-06 at 14:01 +0100, Borislav Petkov wrote:
On Mon, Feb 27, 2023 at 02:29:38PM -0800, Rick Edgecombe wrote:quoted
From: Yu-cheng Yu <redacted> The x86 Control-flow Enforcement Technology (CET) feature includes a new type of memory called shadow stack. This shadow stack memory has some unusual properties, which requires some core mm changes to function properly. Account shadow stack pages to stack memory. Do this by adding a VM_SHADOW_STACK check in is_stack_mapping().That last sentence is superfluous.
Before this version it was open coded, but David Hildenbrand suggested this is_stack_mapping() solution. Should it be explained more, or just dropped?