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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 BCC31C44508 for ; Thu, 9 Jul 2026 11:16:31 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gwsq23dqTz3c6f; Thu, 09 Jul 2026 21:16:30 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1783595790; cv=none; b=WroF/HdbAh16FMtLGvc0gy/wSDM51DE6A2D4PuVeyXnrpsPtSWb1Tr+J4NrwhRwQM7A7MNZLicrm8pi+qC8IMn3ZrsdSt4ZMtx12+hpFTDYkA07o2m07SP82zKLwRVy4aAfKQJ0GTYJ8Bu1xSj83snyXohQ6r8XLCp/nKbYcFEhc01TD4TbAAPbQCLz11sJlvnXKQuMub4CkRfUQ7l/m3PxmXVCbkMwPKslaShVWSKywaStE1tajOUvBQbjWfvBB37fr2zjFzAxJfdIizOUQwCAiav5EYofPazRm1oYuaqv7q3wHpEalYsRBcZCyRG9AOdoFuDJ7SvKvxI9RblqilQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1783595790; c=relaxed/relaxed; bh=lQNxQw6rO9fLZuzYn+ybwybDNA8F5Y/5chm6JwlKasE=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ozQVI6m2yj1Ed2dp5ORnpzcZM8UERONyNscOGZHAmoMrUpFw2awBsiaaRTuWr63Ts5Pxx7jVU2vrFFm0OlCFG6if7Mdts2woCbGIw0Exzusfy0KzgnlgG5Gj0/wBD4dwv564WhleZHunGIfV5IC6bU7tw9BIMT/NJFssKkQvjHYr9ID8o++WsJBLfucSdMfyAbQKar/VMhDgm0zZX+0l+6dzRnBGkZk9BAleCbobV57zzLuwUqOrNCneWci88f9YifKeYkB5b3pQdEU9bM414kTyHYHAsP9evSAit568y+wAuIZLor/U1zOuBHqZE4EuTxMSznmWuX534HgxT+zq3g== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com; dkim=pass (2048-bit key; unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256 header.s=qcppdkim1 header.b=i6Z+l6cz; dkim=pass (2048-bit key; unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.a=rsa-sha256 header.s=google header.b=i5DHayfM; dkim-atps=neutral; spf=pass (client-ip=205.220.180.131; helo=mx0b-0031df01.pphosted.com; envelope-from=philmd@oss.qualcomm.com; receiver=lists.ozlabs.org) smtp.mailfrom=oss.qualcomm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=reject dis=none) header.from=oss.qualcomm.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256 header.s=qcppdkim1 header.b=i6Z+l6cz; dkim=pass (2048-bit key; unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.a=rsa-sha256 header.s=google header.b=i5DHayfM; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=oss.qualcomm.com (client-ip=205.220.180.131; helo=mx0b-0031df01.pphosted.com; envelope-from=philmd@oss.qualcomm.com; receiver=lists.ozlabs.org) Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4gwsq14Yvxz3byT for ; Thu, 09 Jul 2026 21:16:28 +1000 (AEST) Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669AxFc01521479 for ; Thu, 9 Jul 2026 11:16:26 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= lQNxQw6rO9fLZuzYn+ybwybDNA8F5Y/5chm6JwlKasE=; b=i6Z+l6cz0ADxMir5 PP7gquUEvOGqieG+lf85k6tqb18XN99Vb/XbQueU32Nh4DFYdvrk7j7dFspHsXdS Cy7w+CsZ/lI338HKy004q1RoAkSXUYbZGedzGtf6/R1/0ogaog7QiT/r0AH6uhhW EGub/EAkoHwsQwiSwXadb/oYPAyoLb8nSMPbvA5/LtqwV8trHzPhgOS4T3OKYTVp y5/p6PBjRcCgw7xpwdmKpUFT5d7kIO23k48hxSlZ8uRGHGGnWe45xji+gjzdUnc9 Wyi3IdVy9kYk4bNta4UN3ybii4hmT7hogdBdgOfzXklVyIt2UwzF5HAMNiWsF/IF edCxbw== Received: from mail-qv1-f71.google.com (mail-qv1-f71.google.com [209.85.219.71]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4f9sqwbw0t-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 09 Jul 2026 11:16:26 +0000 (GMT) Received: by mail-qv1-f71.google.com with SMTP id 6a1803df08f44-8f45dde7595so21944256d6.3 for ; Thu, 09 Jul 2026 04:16:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1783595786; x=1784200586; darn=lists.ozlabs.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=lQNxQw6rO9fLZuzYn+ybwybDNA8F5Y/5chm6JwlKasE=; b=i5DHayfM8YoOLSWNQM4nujeIQI2dw/jqTYNhyZ6mVYnObJxksn5z8n6u0sd84TBXBc d8fHip0n05IUF6ujR7xay9AAbwE5pC59eW8tYBCIFEEgjgOScXqj2qeQu1KGiRQNXz1/ mM1rBex32Km607aW9kpDg9lFSLzcLmHCqdPFq2W+sEIJV1wCIiB9I8lb5ADqu6SejcX8 +C6jMGEOg17PgjCVYIff6ABzvjw7JWT/Ol/Uv0hfDTK7+9OFWixuu2GHj5OR94qWPYpF /gfoRhIWajhBf74XFAdHXOEFiHeerE9SV0ISC2lqTqBWO1b7GKxh9EJ+Q891EF/MAzMw igEg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783595786; x=1784200586; 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=lQNxQw6rO9fLZuzYn+ybwybDNA8F5Y/5chm6JwlKasE=; b=Kk1HdMiXHaaOwtUjShJ7FdUFoMwrwGpR0nq5vDmdVrhT/EHEzPgO3YakBj7TTfdY+o DmFDNLES2LcCF+AjbQh9LFDIVVmy3u99Sr1zQZawj70ViwPGFSUxaNzf4pW00cjc1Vj/ IZlZsBLYyj2iRA5lyaUdagy0tQc5Mm2Ye4BzIhDprjH8OyU1KM5gfVFAdIP0lj7RnM3Y NfRM44smYMKy7PrAUT2xFJGNR9iGuVT1y4Qxx3vp9c/e9YWF6miznpQz3/0xW31tQrhZ vJC7uuyKrV8Xud6r0kEuiGqFxVRj7X0jpgY4GwGBMVyBtZ6UpwNlgYcT5Lsnj+q3p4Mm KWXA== X-Forwarded-Encrypted: i=1; AHgh+RoYq2SLtWQ00jnbKaWbL0JATqv3QGG8SyzMiIliHPeCcT2INNeiKMBa/5D4JDgcEqsPDb984JHglOwIX1c=@lists.ozlabs.org X-Gm-Message-State: AOJu0YwMnFkpNBfAh1TwCe3j96MgRvCuq65XejVB7xgfqKbB1u725bys DeKj9Dim5s4fo7UIqaukmba4N8DxQYyMQ87FPRnZGQ0K6hNdBiRC50370+mGcCJGO509N1mhZvs 8FafzuMcUI1E7eXzyxiVffCaSpkK64OmK/TT298q/py1VGkApH0dZM92cZ+PXfGbcBoqv X-Gm-Gg: AfdE7ckToxBzxFIOG4YhKUUirqd1jelR4F0MdpiIWYvznMfEyp8p10LNRUtW9q8wSJ0 Yv5HFbIibxGcmGp2z2Cs9nY7TDgLnuvtzL/QhcJUXnv4dON/j82Wh/DtvqT1PzFV7TLu3+P6xGg NecwtzcEhmm4SvrAdNTvnnnLAvHbch3Q1hE7Qya8N14GJ0ORIf5M3Eo0il3OoVvB6OjY12qMJxg XPI+Rrojhydyy5YTZPcpqVSpa6aPBCh5IGMajBY9tBXGm7A4RMzJk5vy6CMYrQqJKRUckB76OFc p0wqG7sMg4y6yMwTSG+H91CcroQcN3pa1gLStPw7j/Xe3E6A6k+JtGi1ylYzIwzaSqEcvbSY8Bs PodL43pdQrdO4KbqAotnpzsY88Z/gGEy3JijNdT9rfJlmIZ1+dh7fj3Dvij+RpQ== X-Received: by 2002:ac8:5a94:0:b0:51c:22c5:daf4 with SMTP id d75a77b69052e-51c8b3033demr72818201cf.28.1783595785863; Thu, 09 Jul 2026 04:16:25 -0700 (PDT) X-Received: by 2002:ac8:5a94:0:b0:51c:22c5:daf4 with SMTP id d75a77b69052e-51c8b3033demr72817641cf.28.1783595785396; Thu, 09 Jul 2026 04:16:25 -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-47a9de1d8cdsm54261424f8f.1.2026.07.09.04.16.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:16:24 -0700 (PDT) Message-ID: Date: Thu, 9 Jul 2026 13:16:21 +0200 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 05/18] powerpc/syscall: Use syscall_enter_from_user_mode_randomize_stack() Content-Language: en-US To: Thomas Gleixner , 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_Such=C3=A1nek?= , Jonathan Corbet , linux-doc@vger.kernel.org References: <20260707181957.433213175@kernel.org> <20260707190253.918861529@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.918861529@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX9hPNLleOgIJL +Jye5TUswg4RxuMUiJ9c9rB4XtqykutYgK95mScibfD2FSEVDn/yt/e/hDmB9Jb4HMAukWWmWTZ BUDK0nWci9JU+3Pn3k3tSfM8jbbRoqoZiTdsfUDLtaTFqwVEOudPHMIO7CgSzB0podmTB7RFuHU w9YWLEg+sXUEpUmI3oLPAKKdX1EziB6MRPCLjH6ubFJ6PMCfShhLZWbcz59JYJMKhlGmr6Ahi3E u6yFpYsOnKWrIM3BmrgRcP8pHCTbfnNsdTb6kTWzCOpvnJcmPMzcM74NngFDf1t47uQgPsnoiZm AASrl2sSfpOsuuzWUKzchcuu3CpOgUAcHCpDPt9OVNyqLb3tEZb+70N8e3mtzF1+dBzgGJodgMJ J2AJ7BcexsyIFnC+Y5wQNaZ5QR1Gz7edWHVdL6LQBkjhVb3t8nH2OlB8Io1GjIL2YZdOOydaimc pgNtxBMtTJ0BRKh8fjg== X-Proofpoint-GUID: ja-cs_gQobDVsNqNosQI4TkkD7fU2sf2 X-Authority-Analysis: v=2.4 cv=fMIJG5ae c=1 sm=1 tr=0 ts=6a4f830a cx=c_pps a=UgVkIMxJMSkC9lv97toC5g==: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=rJkE3RaqiGZ5pbrm-msn:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=voM4FWlXAAAA:8 a=EUspDBNiAAAA:8 a=DoJJhcVa48uSEvU2-xUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=1HOtulTD9v-eNWfpl4qZ:22 a=IC2XNlieTeVoXbcui8wp:22 X-Proofpoint-ORIG-GUID: ja-cs_gQobDVsNqNosQI4TkkD7fU2sf2 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX7acrjAKNWcka HvzY44cKO8emTbrrYqFlZyeDGgxfxODd/a4Ts0+m+expfsxc9qsIhn0C+EddHzyumc7xKMa8QzK NDiZwWncrRHxbrtR3Jsd6Jfvhv6N0O8= 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 adultscore=0 bulkscore=0 phishscore=0 clxscore=1015 impostorscore=0 spamscore=0 priorityscore=1501 malwarescore=0 lowpriorityscore=0 suspectscore=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: Michael Ellerman > Cc: Shrikanth Hegde > Cc: linuxppc-dev@lists.ozlabs.org > --- > arch/powerpc/kernel/syscall.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) Reviewed-by: Philippe Mathieu-Daudé