[Hardy, Maverick] [CVE-2011-0463] [PATCH 1/1] Treat writes as new when holes span across page boundaries, CVE-2011-0463

[Brad Figg]

From: Goldwyn Rodrigues <rgoldwyn at gmail.com>

BugLink: http://bugs.launchpad.net/bugs/770483

CVE-2011-0463

When a hole spans across page boundaries, the next write forces
a read of the block. This could end up reading existing garbage
data from the disk in ocfs2_map_page_blocks. This leads to
non-zero holes. In order to avoid this, mark the writes as new
when the holes span across page boundaries.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn at suse.de>
Signed-off-by: jlbec <jlbec at evilplan.org>

(cherry-pick of commit 272b62c1f0f6f742046e45b50b6fec98860208a0)
Signed-off-by: Brad Figg <brad.figg at canonical.com>
---
 fs/ocfs2/aops.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 0d44b77..b5d7fb9 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1015,6 +1015,12 @@ static int ocfs2_prepare_page_for_write(struct inode *inode, u64 *p_blkno,
 	ocfs2_figure_cluster_boundaries(OCFS2_SB(inode->i_sb), cpos,
 					&cluster_start, &cluster_end);
 
+	/* treat the write as new if the a hole/lseek spanned across
+	 * the page boundary.
+	 */
+	new = new | ((i_size_read(inode) <= page_offset(page)) &&
+			(page_offset(page) <= user_pos));
+
 	if (page == wc->w_target_page) {
 		map_from = user_pos & (PAGE_CACHE_SIZE - 1);
 		map_to = map_from + user_len;
-- 
1.7.0.4