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Message-ID: <202301191703.9E24A4E52@keescook>
Date: Thu, 19 Jan 2023 17:04:00 -0800
From: Kees Cook <keescook@...omium.org>
To: 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>,
Weijiang Yang <weijiang.yang@...el.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
John Allen <john.allen@....com>, kcc@...gle.com,
eranian@...gle.com, rppt@...nel.org, jamorris@...ux.microsoft.com,
dethoma@...rosoft.com, akpm@...ux-foundation.org,
Andrew.Cooper3@...rix.com, christina.schimpe@...el.com
Subject: Re: [PATCH v5 26/39] x86: Introduce userspace API for shadow stack
On Thu, Jan 19, 2023 at 01:23:04PM -0800, Rick Edgecombe wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
>
> Add three new arch_prctl() handles:
>
> - ARCH_SHSTK_ENABLE/DISABLE enables or disables the specified
> feature. Returns 0 on success or an error.
>
> - ARCH_SHSTK_LOCK prevents future disabling or enabling of the
> specified feature. Returns 0 on success or an error
>
> The features are handled per-thread and inherited over fork(2)/clone(2),
> but reset on exec().
>
> This is preparation patch. It does not implement any features.
>
> Tested-by: Pengfei Xu <pengfei.xu@...el.com>
> Tested-by: John Allen <john.allen@....com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
--
Kees Cook
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