diff options
| author | Ben Hutchings <ben@decadent.org.uk> | 2010-12-29 14:55:03 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-05-09 15:55:35 -0700 |
| commit | 84daae5dc885913953823b1303e1fbbbb38a5a53 (patch) | |
| tree | 939ea0dd6c267fe4f1524be25968517b9715f2ca | |
| parent | 4c8478ffa104fa9df0765dd05f395cce3d7a96b4 (diff) | |
btrfs: Require CAP_SYS_ADMIN for filesystem rebalance
commit 6f88a4403def422bd8e276ddf6863d6ac71435d2 upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/btrfs/volumes.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 41ecbb2347f..5d56a8dab69 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -21,6 +21,7 @@ #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" @@ -1900,6 +1901,9 @@ 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; |