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[3.13.y-ckt,stable] Patch "splice: Apply generic position and size checks to each write" has been added to staging queue

Message ID 1424808018-29378-1-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa Feb. 24, 2015, 8 p.m. UTC 
This is a note to let you know that I have just added a patch titled

    splice: Apply generic position and size checks to each write

to the linux-3.13.y-queue branch of the 3.13.y-ckt extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

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From 9a0955f27c69609377a757a8aa0dcf51d5b5a4e1 Mon Sep 17 00:00:00 2001
From: Ben Hutchings <ben@decadent.org.uk>
Date: Thu, 29 Jan 2015 02:50:33 +0000
Subject: splice: Apply generic position and size checks to each write

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@decadent.org.uk>
[ kamal: port to 3.13-stable: context ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/ocfs2/file.c | 8 ++++++--
 fs/splice.c     | 8 ++++++--
 2 files changed, 12 insertions(+), 4 deletions(-)

--
1.9.1
diff mbox

Patch

diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 9c65949..5850a81 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2449,9 +2449,7 @@  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,
 	};

@@ -2461,6 +2459,12 @@  static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
 			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;
+
 	pipe_lock(pipe);

 	splice_from_pipe_begin(&sd);
diff --git a/fs/splice.c b/fs/splice.c
index 12028fa..f345d53 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);