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 99F5FC43602 for ; Tue, 7 Jul 2026 19:06:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type:MIME-Version: References:Subject:Cc:To:From:Message-ID:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: List-Owner; bh=bqcx1niI7ioy3DW+/gZQ2MbLYJEE35hyG+fCdizbDSo=; b=YeW+c87CE1+LaH iDTfFBg/Fy/odgU/iUT4qTosdadMF1za5FF7wtprQAEqvMpPxkqmcYGoRGkZenFn5RDXCsPDg8AKh 7rfMJU2Zc3ZJEbt0avqoDRpobrr+ahy3bFl9+CFBdkqQpjBJkBc3TYYACNEhXTxaJ9JVWuXTUry3E BGmxRVMXTgRo+7eFiNqJ5EJDqYthKwpc7Nfo2GCP5zfFlzs4FI5DJAigkpghN0brlZ/rZvyyb+Tks FLYzJYxJrypO4ll0fXeB3KxWESqjQGH/BSoFnQWKFINj1fDBEtO0/Sywrv6zsk791NXGbWXpqo72R gsuxWL7SWs3a2v7P7TjQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1whB7n-0000000Fh4m-1anT; Tue, 07 Jul 2026 19:06:31 +0000 Received: from tor.source.kernel.org ([2600:3c04:e001:324:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1whB7a-0000000Fgux-37Eh; Tue, 07 Jul 2026 19:06:18 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 2C56B601EC; Tue, 7 Jul 2026 19:06:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14E0D1F00A3A; Tue, 7 Jul 2026 19:06:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783451177; bh=bqcx1niI7ioy3DW+/gZQ2MbLYJEE35hyG+fCdizbDSo=; h=Date:From:To:Cc:Subject:References; b=aJaRZSNFmGdCFvruVG7x5xRrvggSIGN0GND+eCq7/up7llJN2RLb5yTt7nKiF5bMl dDjbHacdEwTpP5I1/lusznloh2jALXKsApluk4rrQ6UjQSVw3qYVOOw6/ktRrDvDFv 6mM4CdAeBuHePM8toFrWSjVi5vf12es33TiR0Erbaqy0+HMgOhtPrzfLuSaVmJcBBf Qwx11aY+YPFSRPD5t62E+zU8M90fmxRE9JPIpsU8ZmTyzhptaz9i1jNQWCYVnDIzEX +BqGBqk3JLQ87YaLjGkYNumyEdOthBs5KZUcJ25lEB3+VQ9NuYSR6XQbeSkS9Uk7wj gTZuo3rzjPU7w== Date: Tue, 07 Jul 2026 21:06:15 +0200 Message-ID: <20260707190253.918861529@kernel.org> User-Agent: quilt/0.69 From: Thomas Gleixner To: LKML Cc: Peter Zijlstra , Michael Ellerman , Shrikanth Hegde , linuxppc-dev@lists.ozlabs.org, Kees Cook , Huacai Chen , loongarch@lists.linux.dev, Paul Walmsley , Palmer Dabbelt , linux-riscv@lists.infradead.org, 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 05/18] powerpc/syscall: Use syscall_enter_from_user_mode_randomize_stack() References: <20260707181957.433213175@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=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: Michael Ellerman Cc: Shrikanth Hegde Cc: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/kernel/syscall.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) --- a/arch/powerpc/kernel/syscall.c +++ b/arch/powerpc/kernel/syscall.c @@ -2,7 +2,6 @@ #include #include -#include #include #include @@ -19,8 +18,7 @@ notrace long system_call_exception(struc long ret; syscall_fn f; - r0 = syscall_enter_from_user_mode(regs, r0); - add_random_kstack_offset(); + r0 = syscall_enter_from_user_mode_randomize_stack(regs, r0); if (unlikely(r0 >= NR_syscalls)) { if (unlikely(trap_is_unsupported_scv(regs))) {