linux-kernel - Re: [PATCH v2] tpm: vtpm_proxy: Double-check to avoid buffer overflow

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Message-ID: <20220118233353.GI8034@ziepe.ca>
Date:   Tue, 18 Jan 2022 19:33:53 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jann Horn <jannh@...gle.com>, Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        linux-integrity@...r.kernel.org,
        Stefan Berger <stefanb@...ux.ibm.com>,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] tpm: vtpm_proxy: Double-check to avoid buffer overflow

On Tue, Jan 18, 2022 at 01:20:40PM -0800, Kees Cook wrote:

> I haven't been able to reproduce the specific cause of why GCC decided to
> do the bounds checking, but it's not an unreasonable thing to check for,
> just for robustness.

Well, the commit message should explain this is to silence a compiler
bug and maybe put some colour on what version(s) are actually buggy..

Jason