3.2.67-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Ben Hutchings <b...@decadent.org.uk>
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 <b...@decadent.org.uk>
---
fs/ocfs2/file.c | 8 ++++++--
fs/splice.c | 8 ++++++--
2 files changed, 12 insertions(+), 4 deletions(-)
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2468,9 +2468,7 @@ static ssize_t ocfs2_file_splice_write(s
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,
};
@@ -2480,6 +2478,12 @@ static ssize_t ocfs2_file_splice_write(s
out->f_path.dentry->d_name.len,
out->f_path.dentry->d_name.name, len);
+ ret = generic_write_checks(out, ppos, &len, 0);
+ if (ret)
+ return ret;
+ sd.total_len = len;
+ sd.pos = *ppos;
+
if (pipe->inode)
mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1013,13 +1013,17 @@ generic_file_splice_write(struct pipe_in
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);
--
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