| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.11 34/94] eCryptfs: fix 32 bit corruption issue | Date | Fri, 8 Nov 2013 22:51:40 -0800 |
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3.11-stable review patch. If anyone has any objections, please let me know.
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From: Colin Ian King <colin.king@canonical.com>
commit 43b7c6c6a4e3916edd186ceb61be0c67d1e0969e upstream.
Shifting page->index on 32 bit systems was overflowing, causing data corruption of > 4GB files. Fix this by casting it first.
https://launchpad.net/bugs/1243636
Signed-off-by: Colin Ian King <colin.king@canonical.com> Reported-by: Lars Duesing <lars.duesing@camelotsweb.de> Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- fs/ecryptfs/crypto.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ecryptfs/crypto.c +++ b/fs/ecryptfs/crypto.c @@ -408,7 +408,7 @@ static loff_t lower_offset_for_page(stru struct page *page) { return ecryptfs_lower_header_size(crypt_stat) + - (page->index << PAGE_CACHE_SHIFT); + ((loff_t)page->index << PAGE_CACHE_SHIFT); } /**
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