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[2001:8b0:10b:1231::1]) by mx.google.com with ESMTPS id u5si1100646jam.36.2019.06.07.00.58.35 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 07 Jun 2019 00:58:35 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of peterz@infradead.org designates 2001:8b0:10b:1231::1 as permitted sender) client-ip=2001:8b0:10b:1231::1; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=c34v2gJu; spf=pass (google.com: best guess record for domain of peterz@infradead.org designates 2001:8b0:10b:1231::1 as permitted sender) smtp.mailfrom=peterz@infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=Z6UrZZzp3n14Ze8Py53PCQO3uqTMikRd3FqfmNFJBQ4=; b=c34v2gJu6/rQ2aR6lzQzkJp4R z4dwER8rHQHa20F2xwJqlwIMnaDfbzgY0t9dtmC00if5JmBXgbJwuagYcVraKs/LOpN57iEZWAQ4Z 7t7YudJFD6qIS39i+NzbtHeGLIClaVI94mba6elh0sLE+c8QjeqhvQneZ+6vITyvsC/YlzzZf7KLg os1cVnpLF3vYqwamMx9h2vPERuVOJzJBX3XIOH+7iw7eyNZ7+DeblVjqaHE45hP7O5GsCdgg/mZ2T wAwFffH77sM5O+pS21lWtrBJwviK0lHJlsAHzQKUXtTSOrZRbG9TXAL3qKQUt76wjH7Dfc5J7d7Vc 8UlJaR+SQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1hZ9lX-0006Ov-Fa; Fri, 07 Jun 2019 07:58:23 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 3C301202CD6B2; Fri, 7 Jun 2019 09:58:22 +0200 (CEST) Date: Fri, 7 Jun 2019 09:58:22 +0200 From: Peter Zijlstra To: Yu-cheng Yu Cc: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue , Dave Martin Subject: Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file Message-ID: <20190607075822.GR3419@hirez.programming.kicks-ass.net> References: <20190606200646.3951-1-yu-cheng.yu@intel.com> <20190606200646.3951-23-yu-cheng.yu@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190606200646.3951-23-yu-cheng.yu@intel.com> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 > Signed-off-by: Yu-cheng Yu 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.