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| author | Ben Hutchings <ben@decadent.org.uk> | 2015-01-29 02:50:33 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-07-03 19:49:05 -0700 |
| commit | b292fc7723b66d9796ae550b284223d95019ac44 (patch) | |
| tree | 9cc49c8655eafeb376ac9653bc7575e7d79d89f8 | |
| parent | ac17ab9b37774017674d11fc3a9f01f815c230e9 (diff) | |
| download | lwn-b292fc7723b66d9796ae550b284223d95019ac44.tar.gz lwn-b292fc7723b66d9796ae550b284223d95019ac44.zip | |
splice: Apply generic position and size checks to each write
commit 894c6350eaad7e613ae267504014a456e00a3e2a from the 3.2-stable branch.
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>
Cc: Vinson Lee <vlee@twopensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/ocfs2/file.c | 8 | ||||
| -rw-r--r-- | fs/splice.c | 8 |
2 files changed, 12 insertions, 4 deletions
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index 7fe30f655aa5..35f54bc96519 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2478,9 +2478,7 @@ 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, }; @@ -2490,6 +2488,12 @@ 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 12028fa41def..f345d53f94da 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); |