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ubifs: Reject unsupported ioctl flags explicitly

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commit 2fe8b2d5578d7d142982e3bf62e4c0caf8b8fe02 upstream.

Reject unsupported ioctl flags explicitly, so the following command
on a regular ubifs file will fail:
	chattr +d ubifs_file

And xfstests generic/424 will pass.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hou Tao 2019-02-09 16:54:20 +08:00 committed by Greg Kroah-Hartman
parent 7e372f648d
commit c68fb6c809
1 changed files with 8 additions and 0 deletions
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8
fs/ubifs/ioctl.c
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@ -28,6 +28,11 @@
#include <linux/mount.h>
#include "ubifs.h"
/* Need to be kept consistent with checked flags in ioctl2ubifs() */
#define UBIFS_SUPPORTED_IOCTL_FLAGS \
(FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \
FS_IMMUTABLE_FL | FS_DIRSYNC_FL)
/**
* ubifs_set_inode_flags - set VFS inode flags.
* @inode: VFS inode to set flags for
@ -166,6 +171,9 @@ long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
if (get_user(flags, (int __user *) arg))
return -EFAULT;
if (flags & ~UBIFS_SUPPORTED_IOCTL_FLAGS)
return -EOPNOTSUPP;
if (!S_ISDIR(inode->i_mode))
flags &= ~FS_DIRSYNC_FL;