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Btrfs: Fix BTRFS_IOC_SUBVOL_SETFLAGS ioctl 

- Check user-specified flags correctly
- Check the inode owership
- Search root item in root tree but not fs tree

Reported-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Li Zefan 2011-02-16 06:06:34 +00:00 committed by Chris Mason
parent c87f08ca44
commit b4dc2b8c69
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/ioctl.c
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@ -1071,12 +1071,15 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
if (copy_from_user(&flags, arg, sizeof(flags)))
return -EFAULT;
if (flags & ~BTRFS_SUBVOL_CREATE_ASYNC)
if (flags & BTRFS_SUBVOL_CREATE_ASYNC)
return -EINVAL;
if (flags & ~BTRFS_SUBVOL_RDONLY)
return -EOPNOTSUPP;
if (!is_owner_or_cap(inode))
return -EACCES;
down_write(&root->fs_info->subvol_sem);
/* nothing to do */
@ -1097,7 +1100,7 @@ static noinline int btrfs_ioctl_subvol_setflags(struct file *file,
goto out_reset;
}
ret = btrfs_update_root(trans, root,
ret = btrfs_update_root(trans, root->fs_info->tree_root,
&root->root_key, &root->root_item);
btrfs_commit_transaction(trans, root);