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btrfs: call permission checks earlier in ioctls and return EPERM

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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>
This commit is contained in:
David Sterba 2014-01-16 15:50:22 +01:00 committed by Chris Mason
parent d024206133
commit bd60ea0fe9
1 changed files with 9 additions and 13 deletions
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22
fs/btrfs/ioctl.c
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@ -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);