Re: [PATCH -mm 5/7] add user namespace
From: Eric W. Biederman
Date: Sun Jul 16 2006 - 06:13:55 EST
Kirill Korotaev <dev@xxxxx> writes:
>>>- if (current->fsuid == inode->i_uid)
>>>+ if ((current->fsuid == inode->i_uid) &&
>>>+ (current->nsproxy->user_ns == inode->i_sb->user_ns))
>>> mode >>= 6;
>> I really don't think assigning a user namespace to a superblock is the
>> right way to go. Seems to me like the _view_ into the filesystem is
>> what you want to modify. That would seem to me to mean that each
>> 'struct namespace' (filesystem namespace) or vfsmount would be assigned
>> a corresponding user namespace, *not* the superblock.
> I dislike this way either. We need an ability to have an access to container
> filesystems and data from the host.
> such a strong checks break this.
No this check doesn't. CAP_DAC_OVERRIDE still works.
Of course enter a running container is a subject for major debate.
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