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authorChristoph Hellwig <hch@lst.de>2009-01-19 02:03:03 +0100
committerLachlan McIlroy <lachlan@sgi.com>2009-01-19 14:44:30 +1100
commit62e194ecdaf8a1935991c1f8704886328d96a391 (patch)
tree730e1c02ece82443f3dbe1314b88763bee4764d2 /fs/xfs
parentab596ad8972f314ace538799734c7e1bdd1da2ff (diff)
xfs: use mnt_want_write in compat_attrmulti ioctl
The compat version of the attrmulti ioctl needs to ask for and then later release write access to the mount just like the native version, otherwise we could potentially write to read-only mounts. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/linux-2.6/xfs_ioctl32.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/xfs/linux-2.6/xfs_ioctl32.c b/fs/xfs/linux-2.6/xfs_ioctl32.c
index fd4362063f2..c70c4e3db79 100644
--- a/fs/xfs/linux-2.6/xfs_ioctl32.c
+++ b/fs/xfs/linux-2.6/xfs_ioctl32.c
@@ -17,6 +17,7 @@
*/
#include <linux/compat.h>
#include <linux/ioctl.h>
+#include <linux/mount.h>
#include <asm/uaccess.h>
#include "xfs.h"
#include "xfs_fs.h"
@@ -458,15 +459,23 @@ xfs_compat_attrmulti_by_handle(
&ops[i].am_length, ops[i].am_flags);
break;
case ATTR_OP_SET:
+ ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
+ if (ops[i].am_error)
+ break;
ops[i].am_error = xfs_attrmulti_attr_set(
dentry->d_inode, attr_name,
compat_ptr(ops[i].am_attrvalue),
ops[i].am_length, ops[i].am_flags);
+ mnt_drop_write(parfilp->f_path.mnt);
break;
case ATTR_OP_REMOVE:
+ ops[i].am_error = mnt_want_write(parfilp->f_path.mnt);
+ if (ops[i].am_error)
+ break;
ops[i].am_error = xfs_attrmulti_attr_remove(
dentry->d_inode, attr_name,
ops[i].am_flags);
+ mnt_drop_write(parfilp->f_path.mnt);
break;
default:
ops[i].am_error = EINVAL;