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Date: Tue, 16 Jun 2015 16:36:43 +0800 From: lizf@...nel.org To: stable@...r.kernel.org Cc: linux-kernel@...r.kernel.org, Ben Hutchings <ben@...adent.org.uk>, Zefan Li <lizefan@...wei.com> Subject: [PATCH 3.4 149/172] splice: Apply generic position and size checks to each write From: Ben Hutchings <ben@...adent.org.uk> 3.4.108-rc1 review patch. If anyone has any objections, please let me know. ------------------ 3.2.67-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Ben Hutchings <ben@...adent.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 <ben@...adent.org.uk> Signed-off-by: Zefan Li <lizefan@...wei.com> --- fs/ocfs2/file.c | 8 ++++++-- fs/splice.c | 8 ++++++-- 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c index bc44ea5..dc79934 100644 --- a/fs/ocfs2/file.c +++ b/fs/ocfs2/file.c @@ -2474,9 +2474,7 @@ 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, }; @@ -2486,6 +2484,12 @@ 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; + if (pipe->inode) mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT); diff --git a/fs/splice.c b/fs/splice.c index bed6a3c..67c5210 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -991,13 +991,17 @@ 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); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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