From: Christoph Hellwig <hch@lst.de>
Date: Thu, 12 Jun 2008 01:53:58 +0000 (-0400)
Subject: BTRFS_IOC_TRANS_START should be privilegued
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=df5b5520b21d8a2554ede65c09b288833c77144d;p=openwrt%2Fstaging%2Fblogic.git

BTRFS_IOC_TRANS_START should be privilegued

As mentioned in the comment next to it btrfs_ioctl_trans_start can
do bad damage to filesystems and thus should be limited to privilegued
users.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
---

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index da8de6cfdb5a..6fb455802759 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -706,6 +706,9 @@ long btrfs_ioctl_trans_start(struct file *file)
 	struct btrfs_trans_handle *trans;
 	int ret = 0;
 
+	if (!capable(CAP_SYS_ADMIN))
+		return -EPERM;
+
 	mutex_lock(&root->fs_info->fs_mutex);
 	if (file->private_data) {
 		ret = -EINPROGRESS;