linux-kernel - Re: [PATCH 0/6] Constant Time Memory Comparisons Are Important

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Message-ID: <878tkzq6wi.fsf@purkki.adurom.net>
Date:   Sun, 11 Jun 2017 11:13:01 +0300
From:   Kalle Valo <kvalo@...eaurora.org>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
Cc:     linux-kernel@...r.kernel.org, kernel-hardening@...ts.openwall.com,
        Anna Schumaker <anna.schumaker@...app.com>,
        David Howells <dhowells@...hat.com>,
        David Safford <safford@...ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Gilad Ben-Yossef <gilad@...yossef.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Gustavo Padovan <gustavo@...ovan.org>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...chiereds.net>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Johannes Berg <johannes@...solutions.net>,
        Marcel Holtmann <marcel@...tmann.org>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Trond Myklebust <trond.myklebust@...marydata.com>,
        keyrings@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH 0/6] Constant Time Memory Comparisons Are Important

"Jason A. Donenfeld" <Jason@...c4.com> writes:

> Whenever you're comparing two MACs, it's important to do this using
> crypto_memneq instead of memcmp. With memcmp, you leak timing information,
> which could then be used to iteratively forge a MAC.

Do you have any pointers where I could learn more about this?

-- 
Kalle Valo