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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>
This commit is contained in:
Christoph Hellwig 2009-01-19 02:03:03 +01:00 committed by Christoph Hellwig
parent d296d30a99
commit 178eae342b
1 changed files with 9 additions and 0 deletions
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9
fs/xfs/linux-2.6/xfs_ioctl32.c
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@ -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;