From: Roland McGrath <roland@hack.frob.com>
To: Will Newton <will.newton@linaro.org>
Cc: libc-ports@sourceware.org
Subject: Re: ARM per-thread stack protector
Date: Fri, 19 Jul 2013 21:41:00 -0000 [thread overview]
Message-ID: <20130719214113.EDAD02C0A1@topped-with-meat.com> (raw)
In-Reply-To: Will Newton's message of Friday, 19 July 2013 17:34:19 +0100 <CANu=Dmg2m0Kq4AieVnwXTKX8axuuJHv8pagaLxebeV+i9ctv4g@mail.gmail.com>
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.
next prev parent 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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