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Date: Sun, 11 Jun 2017 06:36:27 -0700
From: Kees Cook <>
To: Kalle Valo <>
Cc: "Jason A. Donenfeld" <>, LKML <>, 
	"" <>, 
	Anna Schumaker <>, David Howells <>, 
	David Safford <>, "David S. Miller" <>, 
	Gilad Ben-Yossef <>, Greg Kroah-Hartman <>, 
	Gustavo Padovan <>, "J. Bruce Fields" <>, 
	Jeff Layton <>, Johan Hedberg <>, 
	Johannes Berg <>, Marcel Holtmann <>, 
	Mimi Zohar <>, 
	Trond Myklebust <>,,, 
	"open list:NFS, SUNRPC, AND..." <>, linux-wireless <>, 
	Network Development <>
Subject: Re: [PATCH 0/6] Constant Time Memory Comparisons Are Important

On Sun, Jun 11, 2017 at 1:13 AM, Kalle Valo <> wrote:
> "Jason A. Donenfeld" <> 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?

While not using C specifically, this talks about the problem generally:


Kees Cook
Pixel Security

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