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Date: Wed, 21 Jun 2017 11:33:59 -0600
From: Jeff Law <law@...hat.com>
To: Daniel Micay <danielmicay@...il.com>, oss-security@...ts.openwall.com
Subject: Re: Re: Qualys Security Advisor -- The Stack Clash
On 06/20/2017 12:44 AM, Daniel Micay wrote:
> I think it's also worth mentioning the segmented stack support in GCC
> and LLVM that was added for Go. It's possible to use it for C with the
> __morestack call set up to simply abort when stack space is exhausted.
>
> That's what Rust was doing after it dropped segmented stacks, but they
> wanted to move to stack probes for efficiency and prematurely dropped
> these function prelude checks.
>
> It's not efficient, but it works, unlike -fstack-check.
>
> I don't think it makes sense for general purpose distributions to adopt
> it but it's an available option for others with more concern about this
> issue.
Yup. go's split-stacks are another option. As you mention, probably
not performant enough for a general purpose distribution, but could be
interesting for more specialized needs.
jeff
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