The quilt patch titled Subject: shmem: update folio if shmem_replace_page() updates the page has been removed from the -mm tree. Its filename was shmem-update-folio-if-shmem_replace_page-updates-the-page.patch
This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------ From: "Matthew Wilcox (Oracle)" willy@infradead.org Subject: shmem: update folio if shmem_replace_page() updates the page Date: Sat, 30 Jul 2022 05:25:18 +0100
If we allocate a new page, we need to make sure that our folio matches that new page.
If we do end up in this code path, we store the wrong page in the shmem inode's page cache, and I would rather imagine that data corruption ensues.
This will be solved by changing shmem_replace_page() to shmem_replace_folio(), but this is the minimal fix.
Link: https://lkml.kernel.org/r/20220730042518.1264767-1-willy@infradead.org Fixes: da08e9b79323 ("mm/shmem: convert shmem_swapin_page() to shmem_swapin_folio()") Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Reviewed-by: William Kucharski william.kucharski@oracle.com Cc: Hugh Dickins hughd@google.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
mm/shmem.c | 1 + 1 file changed, 1 insertion(+)
--- a/mm/shmem.c~shmem-update-folio-if-shmem_replace_page-updates-the-page +++ a/mm/shmem.c @@ -1782,6 +1782,7 @@ static int shmem_swapin_folio(struct ino
if (shmem_should_replace_folio(folio, gfp)) { error = shmem_replace_page(&page, gfp, info, index); + folio = page_folio(page); if (error) goto failed; } _
Patches currently in -mm which might be from willy@infradead.org are
support-highmem-pages-in-vmap_pages_range_noflush.patch mm-add-vma-iterator.patch mmap-use-the-vma-iterator-in-count_vma_pages_range.patch proc-remove-vma-rbtree-use-from-nommu.patch arm64-remove-mmap-linked-list-from-vdso.patch parisc-remove-mmap-linked-list-from-cache-handling.patch powerpc-remove-mmap-linked-list-walks.patch s390-remove-vma-linked-list-walks.patch x86-remove-vma-linked-list-walks.patch xtensa-remove-vma-linked-list-walks.patch cxl-remove-vma-linked-list-walk.patch optee-remove-vma-linked-list-walk.patch um-remove-vma-linked-list-walk.patch coredump-remove-vma-linked-list-walk.patch exec-use-vma-iterator-instead-of-linked-list.patch fs-proc-task_mmu-stop-using-linked-list-and-highest_vm_end.patch acct-use-vma-iterator-instead-of-linked-list.patch perf-use-vma-iterator.patch sched-use-maple-tree-iterator-to-walk-vmas.patch fork-use-vma-iterator.patch mm-khugepaged-stop-using-vma-linked-list.patch mm-ksm-use-vma-iterators-instead-of-vma-linked-list.patch mm-mlock-use-vma-iterator-and-maple-state-instead-of-vma-linked-list.patch mm-pagewalk-use-vma_find-instead-of-vma-linked-list.patch i915-use-the-vma-iterator.patch nommu-remove-uses-of-vma-linked-list.patch