From 7f1b62457b58f9bb586a1b2ff7fe271b56196bd2 Mon Sep 17 00:00:00 2001 From: Jann Horn Date: Wed, 20 Jul 2016 10:30:30 +1000 Subject: xfs: fix type confusion in xfs_ioc_swapext When calling fdget() in xfs_ioc_swapext(), we need to verify that the file descriptors passed into the ioctl point to XFS inodes before we start operations on them. If we don't do this, we could be referencing arbitrary kernel memory as an XFS inode. THis could lead to memory corruption and/or performing locking operations on attacker-chosen structures in kernel memory. [dchinner: rewrite commit message ] [dchinner: add comment explaining new check ] Signed-off-by: Jann Horn Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index dbca737..408f3ad 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1575,6 +1575,17 @@ xfs_ioc_swapext( goto out_put_tmp_file; } + /* + * We need to ensure that the fds passed in point to XFS inodes + * before we cast and access them as XFS structures as we have no + * control over what the user passes us here. + */ + if (f.file->f_op != &xfs_file_operations || + tmp.file->f_op != &xfs_file_operations) { + error = -EINVAL; + goto out_put_tmp_file; + } + ip = XFS_I(file_inode(f.file)); tip = XFS_I(file_inode(tmp.file)); -- cgit v0.10.2