On Wed, 3 Apr 2024 23:21:30 +0200 David Hildenbrand <david@xxxxxxxxxx> wrote: > PAT handling won't do the right thing in COW mappings: the first PTE > (or, in fact, all PTEs) can be replaced during write faults to point at > anon folios. Reliably recovering the correct PFN and cachemode using > follow_phys() from PTEs will not work in COW mappings. > > ... > > Reported-by: Wupeng Ma <mawupeng1@xxxxxxxxxx> > Closes: https://lkml.kernel.org/r/20240227122814.3781907-1-mawupeng1@xxxxxxxxxx > Fixes: b1a86e15dc03 ("x86, pat: remove the dependency on 'vm_pgoff' in track/untrack pfn vma routines") > Fixes: 5899329b1910 ("x86: PAT: implement track/untrack of pfnmap regions for x86 - v3") These are really old. Should we backport this?
