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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>
[Ben fixed it in 3.2 stable, i ported it to 3.10 stable]
Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ben Hutchings 2015-01-29 02:50:33 +00:00 committed by Greg Kroah-Hartman
parent 1ca630d975
commit 13d32f27d1
2 changed files with 11 additions and 5 deletions
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8
fs/ocfs2/file.c
View File

@ -2459,12 +2459,14 @@ 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,

8
fs/splice.c
View File

@ -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);