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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 DA03FFA372C for ; Fri, 8 Nov 2019 18:54:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AF3B12178F for ; Fri, 8 Nov 2019 18:54:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573239281; bh=sBgZbgR6C/Lf8SuiqL44jF3+gojir72YaIXEd0Ba2uU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=I8Jj+Vcw343f88Jickz5Fjc0pjVb6HBx+NjHw7jslOWcyGGbeIHvrqIVZYy0xATlf jED9gJfz4uSxkcEPh/8JTwOpuXGcf0YPh7r3qXoK61U7ULBg1qJ/69mWyT8pKuVCvH JjYP9/pEO+xzNtuOZac/WVDkR19TgGfZBMOsviDU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1733039AbfKHSyk (ORCPT ); Fri, 8 Nov 2019 13:54:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:51620 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732994AbfKHSyg (ORCPT ); Fri, 8 Nov 2019 13:54:36 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A9478214DB; Fri, 8 Nov 2019 18:54:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573239275; bh=sBgZbgR6C/Lf8SuiqL44jF3+gojir72YaIXEd0Ba2uU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ys0COiLmKbdomai9L8XRlt0EFmX6nJyx9JdtV3ojvMRbATdVBT0J4bVSmCHjGaAUk OCpl+TM7Rn0IypNnPj1f6fLHYnuBWO81vU++5o36zy2GkETaqhVV2BSwCsCrRLTbnF r8PIwhQ1poZ+IM0J8u0EBN4kioeRoePsufW8ftRM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , Julien Thierry , Russell King , "David A. Long" , Sasha Levin , Ard Biesheuvel Subject: [PATCH 4.4 59/75] ARM: 8789/1: signal: copy registers using __copy_to_user() Date: Fri, 8 Nov 2019 19:50:16 +0100 Message-Id: <20191108174800.827466181@linuxfoundation.org> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191108174708.135680837@linuxfoundation.org> References: <20191108174708.135680837@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Julien Thierry Commit 5ca451cf6ed04443774bbb7ee45332dafa42e99f upstream. When saving the ARM integer registers, use __copy_to_user() to copy them into user signal frame, rather than __put_user_error(). This has the benefit of disabling/enabling PAN once for the whole copy intead of once per write. 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 Signed-off-by: Greg Kroah-Hartman --- arch/arm/kernel/signal.c | 47 ++++++++++++++++++++++++++--------------------- 1 file changed, 26 insertions(+), 21 deletions(-) --- a/arch/arm/kernel/signal.c +++ b/arch/arm/kernel/signal.c @@ -256,30 +256,35 @@ static int setup_sigframe(struct sigframe __user *sf, struct pt_regs *regs, sigset_t *set) { struct aux_sigframe __user *aux; + struct sigcontext context; int err = 0; - __put_user_error(regs->ARM_r0, &sf->uc.uc_mcontext.arm_r0, err); - __put_user_error(regs->ARM_r1, &sf->uc.uc_mcontext.arm_r1, err); - __put_user_error(regs->ARM_r2, &sf->uc.uc_mcontext.arm_r2, err); - __put_user_error(regs->ARM_r3, &sf->uc.uc_mcontext.arm_r3, err); - __put_user_error(regs->ARM_r4, &sf->uc.uc_mcontext.arm_r4, err); - __put_user_error(regs->ARM_r5, &sf->uc.uc_mcontext.arm_r5, err); - __put_user_error(regs->ARM_r6, &sf->uc.uc_mcontext.arm_r6, err); - __put_user_error(regs->ARM_r7, &sf->uc.uc_mcontext.arm_r7, err); - __put_user_error(regs->ARM_r8, &sf->uc.uc_mcontext.arm_r8, err); - __put_user_error(regs->ARM_r9, &sf->uc.uc_mcontext.arm_r9, err); - __put_user_error(regs->ARM_r10, &sf->uc.uc_mcontext.arm_r10, err); - __put_user_error(regs->ARM_fp, &sf->uc.uc_mcontext.arm_fp, err); - __put_user_error(regs->ARM_ip, &sf->uc.uc_mcontext.arm_ip, err); - __put_user_error(regs->ARM_sp, &sf->uc.uc_mcontext.arm_sp, err); - __put_user_error(regs->ARM_lr, &sf->uc.uc_mcontext.arm_lr, err); - __put_user_error(regs->ARM_pc, &sf->uc.uc_mcontext.arm_pc, err); - __put_user_error(regs->ARM_cpsr, &sf->uc.uc_mcontext.arm_cpsr, err); + context = (struct sigcontext) { + .arm_r0 = regs->ARM_r0, + .arm_r1 = regs->ARM_r1, + .arm_r2 = regs->ARM_r2, + .arm_r3 = regs->ARM_r3, + .arm_r4 = regs->ARM_r4, + .arm_r5 = regs->ARM_r5, + .arm_r6 = regs->ARM_r6, + .arm_r7 = regs->ARM_r7, + .arm_r8 = regs->ARM_r8, + .arm_r9 = regs->ARM_r9, + .arm_r10 = regs->ARM_r10, + .arm_fp = regs->ARM_fp, + .arm_ip = regs->ARM_ip, + .arm_sp = regs->ARM_sp, + .arm_lr = regs->ARM_lr, + .arm_pc = regs->ARM_pc, + .arm_cpsr = regs->ARM_cpsr, - __put_user_error(current->thread.trap_no, &sf->uc.uc_mcontext.trap_no, err); - __put_user_error(current->thread.error_code, &sf->uc.uc_mcontext.error_code, err); - __put_user_error(current->thread.address, &sf->uc.uc_mcontext.fault_address, err); - __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); + .trap_no = current->thread.trap_no, + .error_code = current->thread.error_code, + .fault_address = current->thread.address, + .oldmask = set->sig[0], + }; + + err |= __copy_to_user(&sf->uc.uc_mcontext, &context, sizeof(context)); err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(*set));