On Thu, Apr 01, 2021 at 03:10:49PM -0700, Yu-cheng Yu wrote:
> When serving a page fault, maybe_mkwrite() makes a PTE writable if its vma
> has VM_WRITE.
>
> A shadow stack vma has VM_SHADOW_STACK. Its PTEs have _PAGE_DIRTY, but not
> _PAGE_WRITE. In fork(), _PAGE_DIRTY is cleared to cause
When serving a page fault, maybe_mkwrite() makes a PTE writable if its vma
has VM_WRITE.
A shadow stack vma has VM_SHADOW_STACK. Its PTEs have _PAGE_DIRTY, but not
_PAGE_WRITE. In fork(), _PAGE_DIRTY is cleared to cause copy-on-write,
and in the page fault handler, _PAGE_DIRTY is restored and
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