The patch titled
Subject: ramfs: fix nommu mmap with gaps in the page cache
has been added to the -mm tree. Its filename is
ramfs-fix-nommu-mmap-with-gaps-in-the-page-cache.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/ramfs-fix-nommu-mmap-with-gaps-in-the-page-cache.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/ramfs-fix-nommu-mmap-with-gaps-in-the-page-cache.patch
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------------------------------------------------------
From: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Subject: ramfs: fix nommu mmap with gaps in the page cache
ramfs needs to check that pages are both physically contiguous and
contiguous in the file. If the page cache happens to have, eg, page A for
index 0 of the file, no page for index 1, and page A+1 for index 2, then
an mmap of the first two pages of the file will succeed when it should
fail.
Link: https://lkml.kernel.org/r/20200914122239.GO6583@xxxxxxxxxxxxxxxxxxxx
Fixes: 642fb4d1f1dd ("[PATCH] NOMMU: Provide shared-writable mmap support on ramfs")
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ramfs/file-nommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ramfs/file-nommu.c~ramfs-fix-nommu-mmap-with-gaps-in-the-page-cache
+++ a/fs/ramfs/file-nommu.c
@@ -224,7 +224,7 @@ static unsigned long ramfs_nommu_get_unm
if (!pages)
goto out_free;
- nr = find_get_pages(inode->i_mapping, &pgoff, lpages, pages);
+ nr = find_get_pages_contig(inode->i_mapping, pgoff, lpages, pages);
if (nr != lpages)
goto out_free_pages; /* leave if some pages were missing */
_
Patches currently in -mm which might be from willy@xxxxxxxxxxxxx are
mm-debug-do-not-dereference-i_ino-blindly.patch
mm-factor-find_get_incore_page-out-of-mincore_page.patch
mm-use-find_get_incore_page-in-memcontrol.patch
mm-optimise-madvise-willneed.patch
mm-optimise-madvise-willneed-fix.patch
proc-optimise-smaps-for-shmem-entries.patch
i915-use-find_lock_page-instead-of-find_lock_entry.patch
mm-convert-find_get_entry-to-return-the-head-page.patch
mm-convert-find_get_entry-to-return-the-head-page-fix.patch
mm-shmem-return-head-page-from-find_lock_entry.patch
mm-shmem-return-head-page-from-find_lock_entry-fix.patch
mm-add-find_lock_head.patch
mm-filemap-fix-filemap_map_pages-for-thp.patch
mm-account-pmd-tables-like-pte-tables.patch
mm-move-pagedoublemap-bit.patch
mm-simplify-pagedoublemap-with-pf_second-policy.patch
page_alloc-fix-freeing-non-compound-pages.patch
xarray-add-xa_get_order.patch
xarray-add-xas_split.patch
xarray-add-xas_split-fix-2.patch
mm-filemap-fix-storing-to-a-thp-shadow-entry.patch
mm-filemap-fix-page-cache-removal-for-arbitrary-sized-thps.patch
mm-memory-remove-page-fault-assumption-of-compound-page-size.patch
mm-page_owner-change-split_page_owner-to-take-a-count.patch
mm-huge_memory-fix-page_trans_huge_mapcount-assumption-of-thp-size.patch
mm-huge_memory-fix-can_split_huge_page-assumption-of-thp-size.patch
mm-rmap-fix-assumptions-of-thp-size.patch
mm-truncate-fix-truncation-for-pages-of-arbitrary-size.patch
mm-page-writeback-support-tail-pages-in-wait_for_stable_page.patch
mm-vmscan-allow-arbitrary-sized-pages-to-be-paged-out.patch
fs-add-a-filesystem-flag-for-thps.patch
fs-do-not-update-nr_thps-for-mappings-which-support-thps.patch
mm-readahead-add-define_readahead.patch
mm-readahead-make-page_cache_ra_unbounded-take-a-readahead_control.patch
mm-readahead-make-do_page_cache_ra-take-a-readahead_control.patch
mm-readahead-add-page_cache_sync_ra-and-page_cache_async_ra.patch
ramfs-fix-nommu-mmap-with-gaps-in-the-page-cache.patch
harden-autofs-ioctl-table.patch
