linux-kernel - Re: [RFC PATCH 3/4] kmod - add call_usermodehelper

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Message-ID: <1369.1417002382@warthog.procyon.org.uk>
Date:	Wed, 26 Nov 2014 11:46:22 +0000
From:	David Howells <dhowells@...hat.com>
To:	ebiederm@...ssion.com (Eric W. Biederman)
Cc:	dhowells@...hat.com, Oleg Nesterov <oleg@...hat.com>,
	Ian Kent <ikent@...hat.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Stanislav Kinsbursky <skinsbursky@...allels.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Benjamin Coddington <bcodding@...hat.com>,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [RFC PATCH 3/4] kmod - add call_usermodehelper_ns() helper

Eric W. Biederman <ebiederm@...ssion.com> wrote:

> Ian if we were to merge this I believe you would win the award for
> easiest path to a root shell.

Is there any particular reason the upcalled program has to be run as root?
Could the kernel not run it as something else - perhaps the caller's UID,GID
or even something anonymous?

Also, call_sbin_request_key() could be given a parameter to call something
other than /sbin/request-key, and key_type::request_key could be used.

David
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