From: Daniel Colascione <dancol@dancol.org>
To: Paul Eggert <eggert@cs.ucla.edu>, Eli Zaretskii <eliz@gnu.org>,
emacs-devel@gnu.org
Subject: Re: Two issues with stack overflow protection
Date: Wed, 29 Jul 2015 04:27:21 -0700 [thread overview]
Message-ID: <55B8B899.8020508@dancol.org> (raw)
In-Reply-To: <55B87B84.4000105@cs.ucla.edu>
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On 07/29/2015 12:06 AM, Paul Eggert wrote:
> Daniel Colascione wrote:
>> What's wrong with just mprotecting a guard page at the end of the stack,
>> and on overflow, giving that region normal protection, unwinding as
>> normal, then, at top level, restoring the guard page?
>
> Unwinding can grow the stack.
Sure. That's why you open up more stack to do the unwinding. Having done
that, if you still overflow, just abort. At that point, you can't
guarantee correct program semantics.
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next prev parent reply other threads:[~2015-07-29 11:27 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-28 17:23 Two issues with stack overflow protection Eli Zaretskii
2015-07-29 5:01 ` Paul Eggert
2015-07-29 6:10 ` Daniel Colascione
2015-07-29 7:06 ` Paul Eggert
2015-07-29 11:27 ` Daniel Colascione [this message]
2015-07-29 13:18 ` Paul Eggert
2015-07-29 16:24 ` Eli Zaretskii
2015-07-29 16:48 ` Paul Eggert
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