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| author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2020-10-15 20:13:04 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-30 10:38:21 +0100 |
| commit | 438191cfde4257238e3dcd765ae77639e1824635 (patch) | |
| tree | 0104cbf428cfde8a7d66f92c640b077d004801ac /fs/ramfs | |
| parent | 67f4d89b4efa2726eb0f04e6987dbcde3e7c24a0 (diff) | |
| download | linux-stable-438191cfde4257238e3dcd765ae77639e1824635.tar.gz linux-stable-438191cfde4257238e3dcd765ae77639e1824635.tar.bz2 linux-stable-438191cfde4257238e3dcd765ae77639e1824635.zip | |
ramfs: fix nommu mmap with gaps in the page cache
[ Upstream commit 50b7d85680086126d7bd91dae81d57d4cb1ab6b7 ]
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.
Fixes: 642fb4d1f1dd ("[PATCH] NOMMU: Provide shared-writable mmap support on ramfs")
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: David Howells <dhowells@redhat.com>
Link: https://lkml.kernel.org/r/20200914122239.GO6583@casper.infradead.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'fs/ramfs')
| -rw-r--r-- | fs/ramfs/file-nommu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c index 3ac1f2387083..5e1ebbe639eb 100644 --- a/fs/ramfs/file-nommu.c +++ b/fs/ramfs/file-nommu.c @@ -228,7 +228,7 @@ static unsigned long ramfs_nommu_get_unmapped_area(struct file *file, 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 */ |