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From: Roland McGrath <>
To: Will Newton <>
Subject: Re: ARM per-thread stack protector
Date: Fri, 19 Jul 2013 21:41:00 -0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: Will Newton's message of  Friday, 19 July 2013 17:34:19 +0100 <>

No machine has a per-thread canary value.  Using one would break
user-implemented stack-switching schemes.

Some machines store the global canary value in every thread's TCB for the
sole reason that it's cheaper to access a field in the TCB than to access a
global variable.  I don't think that's the case on ARM.

  reply	other threads:[~2013-07-19 21:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-19 16:34 Will Newton
2013-07-19 21:41 ` Roland McGrath [this message]
2013-07-22  9:15   ` Will Newton
2013-07-22 22:01     ` Roland McGrath

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