We need to check the position and size of file writes against various
limits, using generic_write_check(). This was not being done for
the splice write path. It was fixed upstream by commit 8d0207652cbe
("->splice_write() via ->write_iter()") but we can't apply that.
CVE-2014-7822
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
[Ben fixed it in 3.2 stable, i ported it to 3.10 stable]
Signed-off-by: Zhang Zhen <zhenzhang.zhang@xxxxxxxxxx>
---
fs/ocfs2/file.c | 8 +++++---
fs/splice.c | 8 ++++++--
2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 46387e4..e0b1c88 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2453,12 +2453,14 @@ static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
struct address_space *mapping = out->f_mapping;
struct inode *inode = mapping->host;
struct splice_desc sd = {
- .total_len = len,
.flags = flags,
- .pos = *ppos,
.u.file = out,
};
-
+ ret = generic_write_checks(out, ppos, &len, 0);
+ if(ret)
+ return ret;
+ sd.total_len = len;
+ sd.pos = *ppos;
trace_ocfs2_file_splice_write(inode, out, out->f_path.dentry,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
diff --git a/fs/splice.c b/fs/splice.c
index 4b5a5fa..f183f13 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1012,13 +1012,17 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
struct address_space *mapping = out->f_mapping;
struct inode *inode = mapping->host;
struct splice_desc sd = {
- .total_len = len,
.flags = flags,
- .pos = *ppos,
.u.file = out,
};
ssize_t ret;
+ ret = generic_write_checks(out, ppos, &len, S_ISBLK(inode->i_mode));
+ if (ret)
+ return ret;
+ sd.total_len = len;
+ sd.pos = *ppos;
+
pipe_lock(pipe);
splice_from_pipe_begin(&sd);
--
1.8.3.4
.
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