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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id C1738C43602 for ; Tue, 7 Jul 2026 19:06:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:Subject:Cc:To: From:Message-ID:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=k1wcU/e7PnPFvPSgoqXarwHDA3nbqJvZ3UAQOHdyUaU=; b=lBfB5IJcs5SDcR j9dDj0LGHHLbsKtG1ze1oxVzkSzizWLI2yD44lLxQzznj37wamueqJ7GdhYgS+cXQjzp7dPCdzlaA /uGOxZPHMNV9AbxMiQpt5Fz+oDDQYLUbA9hSp6FSvLldqxzPiRaucKXOqcWhddAncPpeQNK1BQHJV kBEgbcDuH2keD/TFjGWa270P5MQ6MCd2EOwE68kttF6KIyzglQESQqQ6ljJ1hOJ8kU2wiVlwnuICJ 01tKjpzdYLV6MkbilSX/V7BFLPsCOgfhyNuyWK2oBvHgCQSXz10HjUoGs+4WnoTX7zwYtmqMhPyM4 4Wlk8TID1cnVmePdzyog==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1whB7q-0000000Fh8m-25pY; Tue, 07 Jul 2026 19:06:34 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1whB7e-0000000Fgxw-3u1d; Tue, 07 Jul 2026 19:06:24 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 5EBE9601ED; Tue, 7 Jul 2026 19:06:22 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E5D11F00A3D; Tue, 7 Jul 2026 19:06:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783451182; bh=FSz9R//tXkAkFf727Rcog7SX40mWm3WZD+GcFTZrqNo=; h=Date:From:To:Cc:Subject:References; b=jmy5NgtN1SD2HqwkVPG0TWkFN54TmdXj7T1HSJ0YKKwFEFYGJZgl0bxw21Z5Zw6gF oLz0li+t91OzAxgXcJufOtcILCljJifd/dtqOAvAWgylV3Gsd2EQ0rLxbGfO01LU0j fGSFcIN5CQo8Eb+XAIcZbFr1t/Rccy9Jg9VrEGxft5Y0XFjAFPmIVc5t+s4ruAoLPe NXUZ3wSbTXF7v2pk2mNXgxKVbV69AzbsU6gyihCw7XUl2EEorcZSB4GwvDUCm+Y5ri rE9qNujpevqvyyh40zbml6ST8aYSMsFvamJntu3IcdBj7uE8fU0k0BtndQzpUpA3fJ QZRGwGblw5h8g== Date: Tue, 07 Jul 2026 21:06:19 +0200 Message-ID: <20260707190253.974626922@kernel.org> User-Agent: quilt/0.69 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Sven Schnelle , linux-s390@vger.kernel.org, x86@kernel.org, Mark Rutland , Jinjie Ruan , Andy Lutomirski , Oleg Nesterov , Richard Henderson , Russell King , Catalin Marinas , Guo Ren , Geert Uytterhoeven , Thomas Bogendoerfer , Helge Deller , Yoshinori Sato , Richard Weinberger , Chris Zankel , linux-arm-kernel@lists.infradead.org, linux-alpha@vger.kernel.org, linux-csky@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-sh@vger.kernel.org, linux-um@lists.infradead.org, Arnd Bergmann , Vineet Gupta , Will Deacon , Brian Cain , Michal Simek , Dinh Nguyen , "David S. Miller" , Andreas Larsson , linux-snps-arc@lists.infradead.org, linux-hexagon@vger.kernel.org, linux-openrisc@vger.kernel.org, sparclinux@vger.kernel.org, linux-arch@vger.kernel.org, =?UTF-8?q?Michal=20Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org Subject: [patch 06/18] riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack() References: <20260707181957.433213175@kernel.org> MIME-Version: 1.0 X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+linux-snps-arc=archiver.kernel.org@lists.infradead.org syscall_enter_from_user_mode_randomize_stack() replaces syscall_enter_from_user_mode() and the subsequent invocation of add_random_kstack_offset(). The advantage is that it applies the stack randomization right after enter_from_user_mode() and thereby avoids the overhead of get/put_cpu_var() as that code is invoked with interrupts disabled. No functional change. Signed-off-by: Thomas Gleixner Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: linux-riscv@lists.infradead.org --- arch/riscv/kernel/traps.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -7,7 +7,6 @@ #include #include #include -#include #include #include #include @@ -333,9 +332,7 @@ void do_trap_ecall_u(struct pt_regs *reg riscv_v_vstate_discard(regs); - syscall = syscall_enter_from_user_mode(regs, syscall); - - add_random_kstack_offset(); + syscall = syscall_enter_from_user_mode_randomize_stack(regs, syscall); if (syscall >= 0 && syscall < NR_syscalls) { syscall = array_index_nospec(syscall, NR_syscalls); _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc