linux-kernel - Re: [RFC] call_with

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Date:   Wed, 18 Jul 2018 22:28:44 +0100
From:   David Howells <dhowells@...hat.com>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] call_with_creds()

Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> I explained earlier why it's wrong and fragile, and why it can just
> cause the *reverse* security problem if you do it wrong. So now you
> take a subtle bug, and make it even more subtle, and encourage people
> to do this known-broken model of using creds at IO time.

Are network filesystems allowed to use f_cred at I/O time to determine the
authentication/encryption parameters to commune with the server?

David