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authorBen Hutchings <ben@decadent.org.uk>2010-12-29 14:55:03 +0000
committerChris Mason <chris.mason@oracle.com>2011-01-16 11:30:20 -0500
commit6f88a4403def422bd8e276ddf6863d6ac71435d2 (patch)
tree8fe01d61977e0113cc0a4fa77b7df7f8dfeecad9 /fs/btrfs
parentf690efb1aa2a961dd6655529c1797fcac60ad6d9 (diff)
btrfs: Require CAP_SYS_ADMIN for filesystem rebalance
Filesystem rebalancing (BTRFS_IOC_BALANCE) affects the entire filesystem and may run uninterruptibly for a long time. This does not seem to be something that an unprivileged user should be able to do. Reported-by: Aron Xu <happyaron.xu@gmail.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/volumes.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index e8be478178a..f2d2f4ccc73 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -22,6 +22,7 @@
#include <linux/blkdev.h>
#include <linux/random.h>
#include <linux/iocontext.h>
+#include <linux/capability.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
@@ -2024,6 +2025,9 @@ int btrfs_balance(struct btrfs_root *dev_root)
if (dev_root->fs_info->sb->s_flags & MS_RDONLY)
return -EROFS;
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
mutex_lock(&dev_root->fs_info->volume_mutex);
dev_root = dev_root->fs_info->dev_root;