linux-kernel - Re: [kernel-hardening] Re: vDSO maximum stack usage, stack probes, and -fstack-check

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Message-ID: <a4f2bc2f-4d90-85fe-c0cc-d0d31551e933@marcan.st>
Date:   Sat, 11 Nov 2017 01:36:47 +0900
From:   Hector Martin 'marcan' <marcan@...can.st>
To:     Andy Lutomirski <luto@...capital.net>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        "kernel-hardening@...ts.openwall.com" 
        <kernel-hardening@...ts.openwall.com>, X86 ML <x86@...nel.org>
Subject: Re: [kernel-hardening] Re: vDSO maximum stack usage, stack probes,
 and -fstack-check

On 2017-11-11 01:02, Hector Martin 'marcan' wrote:
> Not entirely sure what's going on here.

Actually, if you think about it, it doesn't matter that it skips the
first page, since it's probing one page more. That just means the caller
will have probed the previous page. So ultimately you're just probing
ahead of where you need to, but that should be OK.

-- 
Hector Martin "marcan" (marcan@...can.st)
Public Key: https://mrcn.st/pub