Re: [patch 02/10] allow unprivileged umount

[ebiederm@xmission.com (Eric W. Biederman)]

Miklos Szeredi <miklos@szeredi.hu> writes:

> From: Miklos Szeredi <mszeredi@suse.cz>
>
> The owner doesn't need sysadmin capabilities to call umount().
>
> Similar behavior as umount(8) on mounts having "user=UID" option in
> /etc/mtab.  The difference is that umount also checks /etc/fstab,
> presumably to exclude another mount on the same mountpoint.
>

bool in the kernel?

int would be much more recognizable as this is not C++

Or do you have place to convert the rest of the kernel that is using
int to return a true/false value to bool?

> +static bool permit_umount(struct vfsmount *mnt, int flags)
> +{
> +	if (capable(CAP_SYS_ADMIN))
> +		return true;
> +
> +	if (!(mnt->mnt_flags & MNT_USER))
> +		return false;
> +
> +	if (flags & MNT_FORCE)
> +		return false;
> +
> +	return mnt->mnt_uid == current->uid;
> +}

Eric