linux-kernel - Re: [tpmdd-devel] [RFC] tpm2-space: add handling for global session exhaustion

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Message-ID: <20170127233513.GA28995@obsidianresearch.com>
Date:   Fri, 27 Jan 2017 16:35:13 -0700
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     James Bottomley <James.Bottomley@...senPartnership.com>
Cc:     Ken Goldman <kgoldman@...ibm.com>,
        tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [RFC] tpm2-space: add handling for global session
 exhaustion

On Fri, Jan 27, 2017 at 02:04:59PM -0800, James Bottomley wrote:

> if I look at the code I've written, I don't know what the session
> number is, I just save sessionHandle in a variable for later use (lets
> say to v1).  If I got the same session number returned at a later time
> and placed it in v2, all I'd notice is that an authorization using v1
> would fail.

Is there any way that could be used to cause an op thinking it is
using v1 to authorize something it shouldn't?

Jason