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authorDavid Sterba <dsterba@suse.cz>2014-01-16 15:50:22 +0100
committerChris Mason <clm@fb.com>2014-01-28 13:20:41 -0800
commitbd60ea0fe947029df4b7b7aa9d6557baf2a5a138 (patch)
tree572b5d652fb6a4c2977bfbc1cc26dac8e3f79d89 /fs/btrfs
parentd024206133ce21936b3d5780359afc00247655b7 (diff)
downloadop-kernel-dev-bd60ea0fe947029df4b7b7aa9d6557baf2a5a138.zip
op-kernel-dev-bd60ea0fe947029df4b7b7aa9d6557baf2a5a138.tar.gz
btrfs: call permission checks earlier in ioctls and return EPERM
The owner and capability checks in IOC_SUBVOL_SETFLAGS and SET_RECEIVED_SUBVOL should be called before any other checks are done. Also unify the error code to EPERM. Signed-off-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
Diffstat (limited to 'fs/btrfs')
-rw-r--r--fs/btrfs/ioctl.c22
1 files changed, 9 insertions, 13 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 8d4457f..62c62b4 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -192,6 +192,9 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
unsigned int i_oldflags;
umode_t mode;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
if (btrfs_root_readonly(root))
return -EROFS;
@@ -202,9 +205,6 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
if (ret)
return ret;
- if (!inode_owner_or_capable(inode))
- return -EACCES;
-
ret = mnt_want_write_file(file);
if (ret)
return ret;
@@ -1697,6 +1697,9 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
u64 flags;
int ret = 0;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
ret = mnt_want_write_file(file);
if (ret)
goto out;
@@ -1721,11 +1724,6 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
goto out_drop_write;
}
- if (!inode_owner_or_capable(inode)) {
- ret = -EACCES;
- goto out_drop_write;
- }
-
down_write(&root->fs_info->subvol_sem);
/* nothing to do */
@@ -4403,6 +4401,9 @@ static long btrfs_ioctl_set_received_subvol(struct file *file,
int ret = 0;
int received_uuid_changed;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
ret = mnt_want_write_file(file);
if (ret < 0)
return ret;
@@ -4419,11 +4420,6 @@ static long btrfs_ioctl_set_received_subvol(struct file *file,
goto out;
}
- if (!inode_owner_or_capable(inode)) {
- ret = -EACCES;
- goto out;
- }
-
sa = memdup_user(arg, sizeof(*sa));
if (IS_ERR(sa)) {
ret = PTR_ERR(sa);
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