From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 60486441030; Tue, 7 Jul 2026 19:06:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783451187; cv=none; b=YgFhLkxinIqoiTeQkyrb6DJH6YS2xlsAO7bTGVq3UMRcdpQYnKDGq9M9WN9/eJz9LZjZ5C0zSncJZw4+lWE5INcl3AYIhOtKcPOdw2HMbFwK5W7xKihfK1mg5VppfcYQkvqYA6zL23XtsdJLTP2RXHfc9xQZ9Eq+d3tpmaQPVEk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783451187; c=relaxed/simple; bh=ysPr6jr6XZIeyODky5nRl6TrszjrF+wONXSVXjJPKpY=; h=Date:Message-ID:From:To:Cc:Subject:References:MIME-Version: Content-Type; b=j42ZY+Vr81erxXtPqC/iyScIhkydgBVKhhV0C55Azk1Bajnv0vAro+pJV6ndWdRw53yqUczYbLnKmHUgACBzvgU8KBNbfgN5ngkf6Dbm3Xy5l7VKtxfyQGKyIhRBczkyC987PFFl1hdZjluA/dIxBY8rPzOqH6ypVoOMPBKlf7Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jmy5NgtN; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jmy5NgtN" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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);