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Date: Mon, 3 Oct 2022 21:37:06 -0700 From: Kees Cook <keescook@...omium.org> To: Andy Lutomirski <luto@...nel.org> Cc: Rick Edgecombe <rick.p.edgecombe@...el.com>, x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org, linux-mm@...ck.org, linux-arch@...r.kernel.org, linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>, Balbir Singh <bsingharora@...il.com>, Borislav Petkov <bp@...en8.de>, Cyrill Gorcunov <gorcunov@...il.com>, Dave Hansen <dave.hansen@...ux.intel.com>, Eugene Syromiatnikov <esyr@...hat.com>, Florian Weimer <fweimer@...hat.com>, "H . J . Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>, Jonathan Corbet <corbet@....net>, Mike Kravetz <mike.kravetz@...cle.com>, Nadav Amit <nadav.amit@...il.com>, Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>, Peter Zijlstra <peterz@...radead.org>, Randy Dunlap <rdunlap@...radead.org>, "Ravi V . Shankar" <ravi.v.shankar@...el.com>, Weijiang Yang <weijiang.yang@...el.com>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, joao.moreira@...el.com, John Allen <john.allen@....com>, kcc@...gle.com, eranian@...gle.com, rppt@...nel.org, jamorris@...ux.microsoft.com, dethoma@...rosoft.com Subject: Re: [PATCH v2 29/39] x86/cet/shstk: Support wrss for userspace On Mon, Oct 03, 2022 at 04:00:36PM -0700, Andy Lutomirski wrote: > On 10/3/22 15:28, Kees Cook wrote: > > On Thu, Sep 29, 2022 at 03:29:26PM -0700, Rick Edgecombe wrote: > > > For the current shadow stack implementation, shadow stacks contents easily > > > be arbitrarily provisioned with data. > > > > I can't parse this sentence. > > > > > This property helps apps protect > > > themselves better, but also restricts any potential apps that may want to > > > do exotic things at the expense of a little security. > > > > Is anything using this right now? Wouldn't thing be safer without WRSS? > > (Why can't we skip this patch?) > > > > So that people don't write programs that need either (shstk off) or (shstk > on and WRSS on) and crash or otherwise fail on kernels that support shstk > but don't support WRSS, perhaps? Right, yes. I meant more "what programs currently need WRSS to operate under shstk? (And what is it that they are doing that needs it?)" All is see currently is compiler self-tests and emulators using it? https://codesearch.debian.net/search?q=%5Cb%28wrss%7CWRSS%29%5Cb&literal=0&perpkg=1 -- Kees Cook
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