linux-kernel - Re: [RFC PATCH v9 21/27] binfmt_elf: Define GNU_PROPERTY_X86_FEATURE_1

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Message-ID: <202002251318.EF0E98EA0@keescook>
Date:   Tue, 25 Feb 2020 13:18:47 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Yu-cheng Yu <yu-cheng.yu@...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>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>, x86-patch-review@...el.com
Subject: Re: [RFC PATCH v9 21/27] binfmt_elf: Define
 GNU_PROPERTY_X86_FEATURE_1_AND

On Wed, Feb 05, 2020 at 10:19:29AM -0800, Yu-cheng Yu wrote:
> An ELF file's .note.gnu.property indicates architecture features of
> the file.  Introduce feature definitions for Control-flow Enforcement
> Technology (CET): Shadow Stack and Indirect Branch Tracking.
> 
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>

Why not merge with patch 20?

-Kees

> ---
>  include/uapi/linux/elf.h | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index c37731407074..61251ecabdd7 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -444,4 +444,11 @@ typedef struct elf64_note {
>    Elf64_Word n_type;	/* Content type */
>  } Elf64_Nhdr;
>  
> +/* .note.gnu.property types */
> +#define GNU_PROPERTY_X86_FEATURE_1_AND		0xc0000002
> +
> +/* Bits of GNU_PROPERTY_X86_FEATURE_1_AND */
> +#define GNU_PROPERTY_X86_FEATURE_1_IBT		0x00000001
> +#define GNU_PROPERTY_X86_FEATURE_1_SHSTK	0x00000002
> +
>  #endif /* _UAPI_LINUX_ELF_H */
> -- 
> 2.21.0
> 

-- 
Kees Cook