On 2/5/20 10:19 AM, Yu-cheng Yu wrote: > A Shadow Stack (SHSTK) 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 and a new VM flag > is necessary for tracking SHSTK VMAs. > > v9: > - Add VM_SHSTK case to arch_vma_name(). > - Revise the commit log to explain why a new VM flag is needed. To be honest, a flag is not strictly *needed*. It is certainly convenient and straightforward, but it's far from being truly necessary.
