From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8E968C282DD for ; Wed, 8 Jan 2020 18:59:48 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 48B7620705 for ; Wed, 8 Jan 2020 18:59:48 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="HY+YSV0O" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 48B7620705 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=kmoS75KGcr2/xThMP7eQ6E+vHmaOPuDxcJP3mpPr2wc=; b=HY+YSV0OWeCJcll2I4nGzQdVq8 EotxwbeKDHwuAVxatnpkRBOn720K7jY9lpcMzBLuAnwKCcLdw8nFyXb3kbD0t+1QnU55GrinNghmd KKj4i/FHENIIb09Xiti3OrvFXuzj3r8CFcwpm4cA29nlC2zCGi8kLzU4+O86fsumnpg44ASAhtFWO RjkowCUq1shxoPfFl686PDR+84Pp2VmEx9CSLt9vDmEAOvaxgE4Is+rnM1Qx2ppe4XxOQqDeXG0ju YdlZGOZBbvCEJF/w9GUDdoucSP2fB4j1MyQprM5qpATSgc4j3+3cTyg1OpBroNIjo7frjn5n4mmB3 sQvOkJNw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ipGYS-0001bG-S2; Wed, 08 Jan 2020 18:59:44 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ipGW2-0007Td-ED for linux-arm-kernel@lists.infradead.org; Wed, 08 Jan 2020 18:57:16 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3506F1FB; Wed, 8 Jan 2020 10:57:14 -0800 (PST) Received: from lakrids.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id A539C3F534; Wed, 8 Jan 2020 10:57:12 -0800 (PST) From: Mark Rutland To: linux-arm-kernel@lists.infradead.org, catalin.marinas@arm.com, will@kernel.org, james.morse@arm.com Subject: [PATCH 11/17] stackleak: allow C to call stackleak_erase() Date: Wed, 8 Jan 2020 18:56:28 +0000 Message-Id: <20200108185634.1163-12-mark.rutland@arm.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20200108185634.1163-1-mark.rutland@arm.com> References: <20200108185634.1163-1-mark.rutland@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200108_105714_537802_F9FC412B X-CRM114-Status: UNSURE ( 9.14 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, keescook@chromium.org, maz@kernel.org, broonie@kernel.org, labbott@redhat.com, robin.murphy@arm.com, julien.thierry.kdev@gmail.com, alex.popov@linux.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org Currently, stackleak_erase() has no prototype in a header file, and has to be called directly from low-level architecture entry assembly code. This necessitates ifdeffery and complicates the entry assembly. To ameliorate matters, let's provide a prototype so that architecture can call stackleak_erase() from slightly higher level C code used as part of the entry flow. This makes things easier to read and maintain. Signed-off-by: Mark Rutland Cc: Alexander Popov Cc: Catalin Marinas Cc: Kees Cook Cc: Laura Abbott Cc: Will Deacon --- include/linux/stackleak.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/stackleak.h b/include/linux/stackleak.h index 3d5c3271a9a8..2b09d3759c76 100644 --- a/include/linux/stackleak.h +++ b/include/linux/stackleak.h @@ -15,6 +15,8 @@ #ifdef CONFIG_GCC_PLUGIN_STACKLEAK #include +asmlinkage void notrace stackleak_erase(void); + static inline void stackleak_task_init(struct task_struct *t) { t->lowest_stack = (unsigned long)end_of_stack(t) + sizeof(unsigned long); @@ -30,6 +32,7 @@ int stack_erasing_sysctl(struct ctl_table *table, int write, #else /* !CONFIG_GCC_PLUGIN_STACKLEAK */ static inline void stackleak_task_init(struct task_struct *t) { } +static inline void stackleak_erase(void) { } #endif #endif -- 2.11.0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel