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ramfs: fix nommu mmap with gaps in the page cache 

[ Upstream commit 50b7d85680 ]

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: 642fb4d1f1 ("[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>
5.4-rM2-2.2.x-imx-squashed
Matthew Wilcox (Oracle) 2020-10-15 20:13:04 -07:00 committed by Greg Kroah-Hartman
parent 410f50b41c
commit c5df8ff043
1 changed files with 1 additions and 1 deletions
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fs/ramfs/file-nommu.c
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@ -224,7 +224,7 @@ 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 */