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Date: Mon, 3 Oct 2022 17:09:04 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Kees Cook <keescook@...omium.org>,
Rick Edgecombe <rick.p.edgecombe@...el.com>
Cc: 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>,
Andy Lutomirski <luto@...nel.org>,
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,
Tom Lendacky <thomas.lendacky@....com>,
"Moger, Babu" <babu.moger@....com>
Subject: Re: [PATCH v2 33/39] x86/cpufeatures: Limit shadow stack to Intel
CPUs
On 10/3/22 16:57, Kees Cook wrote:
> On Thu, Sep 29, 2022 at 03:29:30PM -0700, Rick Edgecombe wrote:
>> Shadow stack is supported on newer AMD processors, but the kernel
>> implementation has not been tested on them. Prevent basic issues from
>> showing up for normal users by disabling shadow stack on all CPUs except
>> Intel until it has been tested. At which point the limitation should be
>> removed.
>>
>> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> So running the selftests on an AMD system is sufficient to drop this
> patch?
Yes, that's enough.
I _thought_ the AMD folks provided some tested-by's at some point in the
past. But, maybe I'm confusing this for one of the other shared
features. Either way, I'm sure no tested-by's were dropped on purpose.
I'm sure Rick is eager to trim down his series and this would be a great
patch to drop. Does anyone want to make that easy for Rick?
<hint> <hint>
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