linux-kernel - Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file

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Message-ID: <20190607075822.GR3419@hirez.programming.kicks-ass.net>
Date:   Fri, 7 Jun 2019 09:58:22 +0200
From:   Peter Zijlstra <peterz@...radead.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@...capital.net>,
        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>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>,
        Dave Martin <Dave.Martin@....com>
Subject: Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an
 ELF file

On Thu, Jun 06, 2019 at 01:06:41PM -0700, Yu-cheng Yu wrote:
> An ELF file's .note.gnu.property indicates features the executable file
> can support.  For example, the property GNU_PROPERTY_X86_FEATURE_1_AND
> indicates the file supports GNU_PROPERTY_X86_FEATURE_1_IBT and/or
> GNU_PROPERTY_X86_FEATURE_1_SHSTK.
> 
> With this patch, if an arch needs to setup features from ELF properties,
> it needs CONFIG_ARCH_USE_GNU_PROPERTY to be set, and a specific
> arch_setup_property().
> 
> For example, for X86_64:
> 
> int arch_setup_property(void *ehdr, void *phdr, struct file *f, bool inter)
> {
> 	int r;
> 	uint32_t property;
> 
> 	r = get_gnu_property(ehdr, phdr, f, GNU_PROPERTY_X86_FEATURE_1_AND,
> 			     &property);
> 	...
> }
> 
> Signed-off-by: H.J. Lu <hjl.tools@...il.com>
> Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>

Did HJ write this patch as suggested by that SoB chain? If so, you lost
a From: line on top, if not, the SoB thing is invalid.