From patchwork Tue Nov 5 20:58:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ard Biesheuvel X-Patchwork-Id: 11228639 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2F01B1390 for ; Tue, 5 Nov 2019 21:11:03 +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 D03992087E for ; Tue, 5 Nov 2019 21:11:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="ftmBBoh1"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="0OM2AqHZ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D03992087E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.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=yMXCnLZXtC5CUew/1vdOCdIfWomvgaaWW0bY8apbZZw=; b=ftmBBoh1VvnA2udSfKVRSEXqt8 rQkBOKnwqecdD4IZoj2pm0KOvKSkt0h083CS491b6Wq2VvQNw1l77Ne8qda8RUrYO+fHB75+FpaVI QFovyhVaOvR4TZmrjUUfxAEf8BoIf/71pOGQttJWWNWlyWViIGKoM6HbGUFPWIZvBJPyxJ0Z2w1hU vYDyU27jYqxZ4kTd7iunp9tieqkU86TUQFc9h5EE8l/S0pqW2tvOhjt/0rM4YyhXiIEybQWfGvrdX wqdonoNB3pUQCj7s7HrZZrM+/1Ivnr+8xS1GXbMJwg946g8n4t/07BSoLjytQrIySxPNoeUv7mlaq vWWqFzlw==; 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 1iS66P-00033u-G6; Tue, 05 Nov 2019 21:11:01 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iS5wh-0008AD-PO for linux-arm-kernel@lists.infradead.org; Tue, 05 Nov 2019 21:01:01 +0000 Received: from e123331-lin.home (lfbn-mar-1-643-104.w90-118.abo.wanadoo.fr [90.118.215.104]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C6CE621929; Tue, 5 Nov 2019 21:00:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1572987659; bh=jMHhSH6WVaFHldxQEhS1yX4A8qCsX75VSMksNAH172Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0OM2AqHZptjGp1/lqqU4xjqdWAYaIOBcziZMl8s5urlRJEFxUyyr3Z+GysNyFwyrc jLcoOB4ZTBH45pTualc6OHJlXypMfG+ZAEAt881b4Nuv83ghODROw0iW/PyJnGqeOl Opl0Nsj6qEURhblZiuWpc1j0lXqK2jCcFx2rWhww= From: Ard Biesheuvel To: linux-arm-kernel@lists.infradead.org Subject: [PATCH for-stable-v4.4 42/53] ARM: 8793/1: signal: replace __put_user_error with __put_user Date: Tue, 5 Nov 2019 21:58:35 +0100 Message-Id: <20191105205846.1394-43-ardb@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191105205846.1394-1-ardb@kernel.org> References: <20191105205846.1394-1-ardb@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191105_130059_912820_C5343F16 X-CRM114-Status: GOOD ( 10.71 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender 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 , Sasha Levin , Florian Fainelli , Julien Thierry , Tony Lindgren , Catalin Marinas , Russell King , "David A . Long" , Marc Zyngier , Will Deacon , Ard Biesheuvel MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Julien Thierry Commit 18ea66bd6e7a95bdc598223d72757190916af28b upstream. With Spectre-v1.1 mitigations, __put_user_error is pointless. In an attempt to remove it, replace its references in frame setups with __put_user. Signed-off-by: Julien Thierry Signed-off-by: Russell King Signed-off-by: David A. Long Reviewed-by: Julien Thierry Signed-off-by: Sasha Levin Signed-off-by: Ard Biesheuvel --- arch/arm/kernel/signal.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c index 135b1a8e12eb..0a066f03b5ec 100644 --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -302,7 +302,7 @@ setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set) if (err == 0) err |= preserve_vfp_context(&aux->vfp); #endif - __put_user_error(0, &aux->end_magic, err); + err |= __put_user(0, &aux->end_magic); return err; } @@ -434,7 +434,7 @@ setup_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) /* * Set uc.uc_flags to a value which sc.trap_no would never have. */ - __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); + err = __put_user(0x5ac3c35a, &frame->uc.uc_flags); err |= setup_sigframe(frame, regs, set); if (err == 0) @@ -454,8 +454,8 @@ setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) err |= copy_siginfo_to_user(&frame->info, &ksig->info); - __put_user_error(0, &frame->sig.uc.uc_flags, err); - __put_user_error(NULL, &frame->sig.uc.uc_link, err); + err |= __put_user(0, &frame->sig.uc.uc_flags); + err |= __put_user(NULL, &frame->sig.uc.uc_link); err |= __save_altstack(&frame->sig.uc.uc_stack, regs->ARM_sp); err |= setup_sigframe(&frame->sig, regs, set);