Re: [PATCH v6 29/41] x86/shstk: Add user-mode shadow stack support

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To: "Edgecombe, Rick P" <rick.p.edgecombe@xxxxxxxxx>
Subject: Re: [PATCH v6 29/41] x86/shstk: Add user-mode shadow stack support
From: Borislav Petkov <bp@xxxxxxxxx>
Date: Fri, 24 Feb 2023 19:33:50 +0100
Cc: "david@xxxxxxxxxx" <david@xxxxxxxxxx>, "bsingharora@xxxxxxxxx" <bsingharora@xxxxxxxxx>, "hpa@xxxxxxxxx" <hpa@xxxxxxxxx>, "Syromiatnikov, Eugene" <esyr@xxxxxxxxxx>, "peterz@xxxxxxxxxxxxx" <peterz@xxxxxxxxxxxxx>, "rdunlap@xxxxxxxxxxxxx" <rdunlap@xxxxxxxxxxxxx>, "keescook@xxxxxxxxxxxx" <keescook@xxxxxxxxxxxx>, "Yu, Yu-cheng" <yu-cheng.yu@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, "kirill.shutemov@xxxxxxxxxxxxxxx" <kirill.shutemov@xxxxxxxxxxxxxxx>, "Eranian, Stephane" <eranian@xxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "fweimer@xxxxxxxxxx" <fweimer@xxxxxxxxxx>, "nadav.amit@xxxxxxxxx" <nadav.amit@xxxxxxxxx>, "jannh@xxxxxxxxxx" <jannh@xxxxxxxxxx>, "dethoma@xxxxxxxxxxxxx" <dethoma@xxxxxxxxxxxxx>, "kcc@xxxxxxxxxx" <kcc@xxxxxxxxxx>, "linux-arch@xxxxxxxxxxxxxxx" <linux-arch@xxxxxxxxxxxxxxx>, "pavel@xxxxxx" <pavel@xxxxxx>, "oleg@xxxxxxxxxx" <oleg@xxxxxxxxxx>, "hjl.tools@xxxxxxxxx" <hjl.tools@xxxxxxxxx>, "Yang, Weijiang" <weijiang.yang@xxxxxxxxx>, "Lutomirski, Andy" <luto@xxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, "arnd@xxxxxxxx" <arnd@xxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "Schimpe, Christina" <christina.schimpe@xxxxxxxxx>, "mike.kravetz@xxxxxxxxxx" <mike.kravetz@xxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "debug@xxxxxxxxxxxx" <debug@xxxxxxxxxxxx>, "jamorris@xxxxxxxxxxxxxxxxxxx" <jamorris@xxxxxxxxxxxxxxxxxxx>, "john.allen@xxxxxxx" <john.allen@xxxxxxx>, "rppt@xxxxxxxxxx" <rppt@xxxxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "corbet@xxxxxxx" <corbet@xxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-api@xxxxxxxxxxxxxxx" <linux-api@xxxxxxxxxxxxxxx>, "gorcunov@xxxxxxxxx" <gorcunov@xxxxxxxxx>
In-reply-to: <06ade29966bbb8bd47cd05b04b5523aa0d4192f0.camel@intel.com>
References: <20230218211433.26859-1-rick.p.edgecombe@intel.com> <20230218211433.26859-30-rick.p.edgecombe@intel.com> <Y/ir6dBo+8g+pnay@zn.tnic> <06ade29966bbb8bd47cd05b04b5523aa0d4192f0.camel@intel.com>

On Fri, Feb 24, 2023 at 06:25:57PM +0000, Edgecombe, Rick P wrote:
> I'll add a little more info in the commit log about this.

Thanks.

And I can't do anything but agree with the train of thought you guys
are having - 32-bit is a dead horse and we should stop trying to revive
it.

:-)

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

References:
- [PATCH v6 00/41] Shadow stacks for userspace
  - From: Rick Edgecombe
- [PATCH v6 29/41] x86/shstk: Add user-mode shadow stack support
  - From: Rick Edgecombe
- Re: [PATCH v6 29/41] x86/shstk: Add user-mode shadow stack support
  - From: Borislav Petkov
- Re: [PATCH v6 29/41] x86/shstk: Add user-mode shadow stack support
  - From: Edgecombe, Rick P

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