Date: Sat, 20 Jan 2018 13:13:26 +0300 From: Alexander Popov <alex.popov@...ux.com> To: Kees Cook <keescook@...omium.org> Cc: kernel-hardening@...ts.openwall.com, PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>, Ingo Molnar <mingo@...nel.org>, Andy Lutomirski <luto@...nel.org>, Tycho Andersen <tycho@...ho.ws>, Laura Abbott <labbott@...hat.com>, Mark Rutland <mark.rutland@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Borislav Petkov <bp@...en8.de>, Thomas Gleixner <tglx@...utronix.de>, "H . Peter Anvin" <hpa@...or.com>, Peter Zijlstra <a.p.zijlstra@...llo.nl>, "Dmitry V . Levin" <ldv@...linux.org>, X86 ML <x86@...nel.org> Subject: Re: [PATCH RFC v7 0/6] Introduce the STACKLEAK feature and a test for it On 19.01.2018 00:13, Kees Cook wrote: > On Thu, Jan 18, 2018 at 5:09 AM, Alexander Popov <alex.popov@...ux.com> wrote: >> So I don't think that (1) without (2) is actually a good feature. I would >> propose to refrain from separating the stack erasing and the lowest_stack tracking. > > How about an option to clear the _entire_ stack, then, when the plugin > isn't available? That gives us a range of options and provides an easy > way to compare the performance of the tracking. i.e. can compare off, > full, and smart. Yes, I should try it. I'll return with the results of the performance tests. We'll discuss them; if full stack erasing is not too slow, I'll introduce it in the 8'th version of the patch series. Thanks! Best regards, Alexander
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