From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 1F5643CBE96 for ; Thu, 9 Jul 2026 11:16:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595820; cv=none; b=BfIbJTO5NRHfGxJJsscbtZNUjom59i5HG4ZgxSWDawgLhp6o9V5nONwnTA70XkpdgPJhYjXI3VZt9bEUYJWP2PA3ufUOC7H0ozeckgMJqSCFz3KBh2LW5bmoajlxLZW8JOz/n4met7aeHFoX8iqCibMwAbt6gmUxAbLFL9zPrgA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595820; c=relaxed/simple; bh=tutnNf9YAg3H/q95A7Iik+KRuKDbYTmWKhCV2b/wa50=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=GMVkb8v3W0GTx/CGbbRvCjZ9rGVuZZA5NIrEHkfHbgDeYSvUYyY7sZSwWMjXwbX1ZjLB1uoxtfcennxD1lw/1Xx1ml9khwT2RZty0gfxudEZchZTU/uw+KLN07FwXv4bBtHM0Q6ltl+Y1sH71MfK0qw+VWV+ZnGjql932al16l0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; spf=pass smtp.mailfrom=oss.qualcomm.com; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b=bZBcJAam; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=HcXXwov2; arc=none smtp.client-ip=205.220.168.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=oss.qualcomm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=qualcomm.com header.i=@qualcomm.com header.b="bZBcJAam"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="HcXXwov2" Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669AxOhm1484336 for ; Thu, 9 Jul 2026 11:16:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qualcomm.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= OP+BLCmg7XOu9OIoY1nTg278DC95imbUOhUvbiFMd6M=; b=bZBcJAam+ibbXFwx fYme4cr8sBqjGZ8/bhY813m3zZdemgRcv+ZZn5hEkMKaS7vw0Lsk0C+lZaMW/4N7 48Ti3b9W5djrMW6C6sRvr/fRMwvlr3Xwdk0O8mST92o98b2JRkz34WzfXmdlRdyc +GNzKHdNyJRx4XFA9Y/FW2dL+68kjj0jsC9rEzLvB9U2wtPREHvCZncHnjBH0nco DqfIf8EOVkC/PQXn3R9FFwNfO+c4fAiAxBDB9r3vKIUe0k0qjSg4thZ00H8jr+97 7VzXtBysfy4u+kGoa711kKXXJoacuD/Fbabaj49b91/ZVeI4dz7AgvccLaeW9YDn oHnuIA== Received: from mail-qt1-f198.google.com (mail-qt1-f198.google.com [209.85.160.198]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4fa1ydtamh-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 09 Jul 2026 11:16:56 +0000 (GMT) Received: by mail-qt1-f198.google.com with SMTP id d75a77b69052e-51c1b4d961dso8967891cf.1 for ; Thu, 09 Jul 2026 04:16:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1783595816; x=1784200616; darn=lists.linux-m68k.org; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:from:to:cc:subject:date:message-id:reply-to:content-type; bh=OP+BLCmg7XOu9OIoY1nTg278DC95imbUOhUvbiFMd6M=; b=HcXXwov2/iQNBqmsrqV9FCV2Cjg2nMdxHLo0QyT45jPYeFj+x6E4QBg9XGkXFAo6pK Q5KTmissjj1xc3d+h51b8NeQeHGJAYtMldjpwd+GYyDWUMSXHXMYCskMNs5LT1XCIuxo Bf1aEbn9vXbF/ti3/qWkNAfUAj/pi6V3YboHV0mLYnGso/8G8yCtSRRdSB6iyqx+UJof 8+LK0C87ov1vbMH9EVw9JyvAwZLVo2WoJm6Er9nI69WFjLDFZHRg06Li/ApbRyLqixEN DSwcMaMCO5vMGrwd8TXitQSKHRwriC5oMO1s7IlSbxRX5yrL1Ak4J0Rk8z0grMMG38RL A9Pw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783595816; x=1784200616; h=content-transfer-encoding:content-type:in-reply-to:from:references :cc:to:content-language:subject:user-agent:mime-version:date :message-id:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=OP+BLCmg7XOu9OIoY1nTg278DC95imbUOhUvbiFMd6M=; b=MBn3jPXR6XDuNRSbteGtWTJD1BKi/Fh75dG3R+AU569nx5WSzo72aF6SUcPscXHZQ2 u+psHCXwmYtKLUghCZGhemAr0aB6ZjFETbDywlT03H/Hu5AvCtcCTnEZaSZyg/cCZmZA KGyyds0dkpYSJqBbkqhbklD4frKdTfqsXjGmr3KYpiyQZmOOwIXIOv0xYuLtYCncIDDc hCf6dxy9i+kzMahpkKSzG8F4fYNJ+bSljBZrlFYt+4NnC0F8hRTwEHHuB2a7qargmfrg Qv4ohsGSnZ6dJgBH2JRNnEdbg3ArJpQ5E/NGHD4Sai078vqhhZaNtR0eGo6Jb9Mm53Xi M/Pw== X-Forwarded-Encrypted: i=1; AHgh+RrgmlKx11jXuZHhH121RMkDLjuTvBrE+4GaNkyk+YJdjpMla8xPQPHA3oAifuhpuEVEZoCTqKC1n62e@lists.linux-m68k.org X-Gm-Message-State: AOJu0YyRpAJz52YbCZgx88Vr7+7gKV7LCn6yEIOj/2PlH/tB7lVZgXpa ZSFTc2pPPt5wfeCYX4xB4ryFwwDKagj5rgWWO0D3psLc9OKTMmoYK7avonNq+KZywm1PXHQzD6A 1lYIRBiYkqb5/ocQSw1TR7FIXeX2wcTeh6/jKbldZBUJNd+/3y5eJw9TzA1nOygOkBSpsOPc= X-Gm-Gg: AfdE7cmXJn1aLePKFEeLoxR/P2nI2mx5vz4WCWvfoD7lAVFd2nyopfhlq02eRDR70jT fUmox81MZspBGTCh1C3iFUyNyDsmtmnJR8zXFUu28Fg9Im3O4IyBHVHY+/e2akIEC/HYEqW3RjA jMqb42KDnPzqJGQYkI4T/750uAxNPfk3Pg2s+5jdCz/pEsBX8mloGEQ31FisEf0c6pBNaWaK+v2 hejrk+IfB0RJkNjL2ZgbrRYb7QEAt7HSWZYVFyPHDq8Sr2qxUActlcTAX5x/FBkcvoTIl7qN6eS yrHIGNr/3XKDxA2pKD2uX0u2Z8/iav75YFltyNRVucdiBAyoerqVAISstRE1LSRGVMBGUwQoX4D 3fk8HZniC2JCLIx5ZOXAXv1aERZtw5n8JNB4DgHW92rNQ72DzFPeWJZAcWkZH9A== X-Received: by 2002:a05:622a:1cce:b0:51c:558:cbbd with SMTP id d75a77b69052e-51c9ba21545mr21236491cf.41.1783595815669; Thu, 09 Jul 2026 04:16:55 -0700 (PDT) X-Received: by 2002:a05:622a:1cce:b0:51c:558:cbbd with SMTP id d75a77b69052e-51c9ba21545mr21236071cf.41.1783595815288; Thu, 09 Jul 2026 04:16:55 -0700 (PDT) Received: from [192.168.69.219] (88-187-86-199.subs.proxad.net. [88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47a9e4d8410sm51612968f8f.15.2026.07.09.04.16.51 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:16:54 -0700 (PDT) Message-ID: Date: Thu, 9 Jul 2026 13:16:51 +0200 Precedence: bulk X-Mailing-List: linux-m68k@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 06/18] riscv/syscall: Use syscall_enter_from_user_mode_randomize_stack() Content-Language: en-US To: Thomas Gleixner , 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_Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org References: <20260707181957.433213175@kernel.org> <20260707190253.974626922@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.974626922@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX/VgCyXGi/ui5 DhZY8v6zXLCHKZDpQCu0zkxF5Men2rRT0Ltr71iP+TVFbKLspbTfEYNa2yY5RNv69Udzpl6zrkS p9jvomM0/xozOiVDBmZyUtOMgpjjiT0= X-Proofpoint-ORIG-GUID: q_RLDk5SaNsR7G4dJof-_4YbP1pIbGyj X-Authority-Analysis: v=2.4 cv=cOLQdFeN c=1 sm=1 tr=0 ts=6a4f8328 cx=c_pps a=mPf7EqFMSY9/WdsSgAYMbA==:117 a=4s3hRJSeHn4rkQlkrse1kQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=M51BFTxLslgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=_K5XuSEh1TEqbUxoQ0s3:22 a=VwQbUJbxAAAA:8 a=_O3DOGVWAAAA:8 a=JfrnYn6hAAAA:8 a=EUspDBNiAAAA:8 a=DoJJhcVa48uSEvU2-xUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=dawVfQjAaf238kedN5IG:22 a=2TKV-7w1aU1AVAwN0oqT:22 a=1CNFftbPRP8L7MoqJWF3:22 X-Proofpoint-GUID: q_RLDk5SaNsR7G4dJof-_4YbP1pIbGyj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX+gLM3+b8jvIx wlZfS55ThQOKUFHsvqE6J1ghRS9yEm8oTJ6D7XfaG5uuMhJz7npbOKYmMeRsUVSfNZFXQ67pCKl en9t1ZOPVWkNGZhegQxQFG21l+e2jH2fdTcVcl3YyqnA3nXZTiOm7wwtiPf9PizhVwt1Dqv9gYx L+WyHYigqWOAotOup0GewxYOOlCTexGleAUlXGHruhNJj3dKpL5j3yg9t54Lla9uAc1hdkhgZW0 VuZxU8t2cENWF9niez2yn6YPu640enAT9AejVc8uwZv1I74Mpss/Dm6JyG4Ay9aPRUbAakpUUZI mwCu4TAEdNMBO+LpMAM6+supyOB2p50xmLJ3+kgAdyy4SJ3oXvzEv+0XUIIZVBK5vNdKzAzpGwi IFHoU3YmuCB/JybPFxFuPeMSYKN1KzCxBVwmjeKpVqLecW9TwKu4ONWMaAZ98uqWZnp+eI9DOAl QGuvfL+blKENtTnBjgw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-09_02,2026-07-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 priorityscore=1501 bulkscore=0 spamscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 impostorscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607090108 On 7/7/26 21:06, Thomas Gleixner wrote: > 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(-) Reviewed-by: Philippe Mathieu-Daudé