Date: Mon, 19 Jun 2017 12:46:20 -0400 From: Daniel Micay <danielmicay@...il.com> To: oss-security@...ts.openwall.com, Qualys Security Advisory <qsa@...lys.com> Subject: Re: Qualys Security Advisory - The Stack Clash On Mon, 2017-06-19 at 09:40 -0600, kseifried@...hat.com wrote: > On 06/19/2017 09:28 AM, Qualys Security Advisory wrote: > > > > Qualys Security Advisory > > > > The Stack Clash > > I just want to publicly thank Qualys for working with the Open Source > community so we (Linux and *BSD) could all get this fixed properly. > There was a lot of work from everyone involved and it all went pretty > smoothly. Fixing it properly would really also include fixing these: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68065 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66479 and actually implementing -fstack-check as not just a no-op in Clang. Windows has working stack probes, even in Windows XP and perhaps even earlier. LLVM has working stack probes there (not sure if GCC deals with it properly) yet doesn't make them available elsewhere. Rust is 'memory safe' but has this same stack exhaustion issue. It didn't used to have the issue, since it kept around the LLVM segmented stack code generation after it dropped segmented stacks to check for stack overflow in function preludes. That got dropped for a 1-3% performance win from using stack probes instead... which was a good idea, but without implementing stack probes... making it a terrible idea. It was deferred to some later date. That was in July 2015, and 2 years later it's not done.
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