From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (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 F2B51410D34 for ; Thu, 9 Jul 2026 11:15:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595720; cv=none; b=fEfJS90lx4JYQsrZ98c3fgUso8tCb0QNp9Fs/nM2IKCS3FUEEOS/Gs4AZhyvh1v051PRMQezU3v/qYxi1o9EwWYo/mQCKzNrDUAlaL3voEzSvqp7Zdy62UmO9g8Vr5ayuaP61qLJ3eELm6H4PIBTkbX7INLSISUSdscXIQAQBnc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595720; c=relaxed/simple; bh=hMQxGqDMYjVKngpsQDGYdUmnvhAEUJmuhgzHeTWQMzw=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bGkRzoYH/XN55y24mkmQU+I4dOCk8GlUgTSyAYMg+60GTh/tXu/PveGnY+Xl+1nVi1hbV94+uluoBikB5BKZctPbO/cn+dNMv2dxKWFsqi4XFJMhJsySCtvRu3sSyY/z2EDZzOWgTZcS2nNIkyjkknaVTBCmsy4Diw7o3EBZh+E= 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=QY+QAjG7; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=ClypiPMB; arc=none smtp.client-ip=205.220.180.131 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="QY+QAjG7"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="ClypiPMB" Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669Axfqp1614613 for ; Thu, 9 Jul 2026 11:15:17 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= h+HMbGg4SL+5U70oYYJ2l7pisY/QrLqdUOSZy/EbODI=; b=QY+QAjG7JhI01DOL wrAWMBSfa2EsIJlZOBwNOpqR74GzzqMsWGKTL1nRLElce+kxLmPXGSEYyErRT9bs jrNUZ5qVhOMFlBS0g8+r8Lj5pkWx0HY2wr4Y4a6rA/soxkxGEv/GhwH6BfRMk7jC wxIkHw7CzIPD4C4hy06RY+nKd1hJsp9iQzkVAWdtTEM+7XcTYBvK6npbb6yBBaJ1 CW4Qj8HEgGXE+RZq1+7fNu0Wd4ijs3A5FZcUaa9zPvqhQLDRRhC6VCASBWFqdB7d 2iZ0nRAY5gwJd6YOiD4NmrqJffwjsCb4nFAr/D46CSDxbk0OC7RRzM/ZY22CoVf3 XPhT6g== Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4f9ug6kdee-1 (version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT) for ; Thu, 09 Jul 2026 11:15:16 +0000 (GMT) Received: by mail-qt1-f197.google.com with SMTP id d75a77b69052e-51c07f25de2so15138231cf.3 for ; Thu, 09 Jul 2026 04:15:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oss.qualcomm.com; s=google; t=1783595716; x=1784200516; darn=vger.kernel.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=h+HMbGg4SL+5U70oYYJ2l7pisY/QrLqdUOSZy/EbODI=; b=ClypiPMB6jKo7P5sHj1+Fv/mXETxyK3+/EjkqAnWwmoljqJN7QXJfOu8CAfraZuH3g GuHZWt2bIkP4U44wALzkgkjYxWaBQ3fW+Yq5AbO0jjc+qEBexV7WJs8/CmDA7BeTm53A rxfFuO9zHrKoCIY4iI+9GnJQGaMoeWyiwzOu6GNJMrqZ8bA7V2QfivjkLOmFR/SVoHy2 6qZUS0aKJjZDlw8GsTVqQtLrEL3ML4LFs70Oeu1OV7Bkv5tcqv8T/kxWXEsdum2EALmV hAiM2NdhGskiXJxHuFYFjT/ROa1oISdR5APSgrrMBfRwTK94dnkpoY525IwBv+86H2Kv +ITQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783595716; x=1784200516; 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=h+HMbGg4SL+5U70oYYJ2l7pisY/QrLqdUOSZy/EbODI=; b=JrnZSIajYQVf76Xzzx6dORc6d7gKq/osOWOmDQjTdQcDDSND6EmQou07QaslGgHQNl n7XH8oV9HbdpV4thdYvSLtH27Xs72HReblhCdGjz+UmVKdELFOkH2CXduwc0qGiL30wm nNNtMzJYA8gohCdhbVYUtAfrrbm3DjPTcECNHmOxRPX1D063MEVW4ti6nrM/5c7OwXqy 56nwBdTF+rZMCa5MpFehxbWRyy5H6XuR070PH98oFlWEARhEGpVQyr3zF41O3qAT7iZx PvzTCSUjErZXGd1iHpIjV3DVabWtYjoJp6ny4vsmI7m4jlI5+MfCmc9oj/2aHVDiXyBf y77A== X-Forwarded-Encrypted: i=1; AHgh+RrhEXH5aCYL9svoFIJlpgXfSy4q8Y7FEfOWJa0y/kNwRrgAQsl95OMhQQgpunzA45dYOJBWWdutfg==@vger.kernel.org X-Gm-Message-State: AOJu0YyuldA9RBtVBfa8yA/5y5NEKF9FJeTOX3FYr/YwBFIkOFXpp+H5 rbNlqsLHV6+mVPq1bEKRc/9NF20gOmbDKDthDRgOABYmMvssd7B116ir3D6dBSf7dk9+iv5l4Bv x67+2JGFjbvkfirsmZOpYxTbZVPSEtCh5WHROyFH4oaH5jI5rMjLDnx9aknjEbQ== X-Gm-Gg: AfdE7cmKaviO9qYL0H6n469yRFfUr4iTtDeGRzDV0V84tGHQpsFpFqRiYmuITWS2D0m RpM2wGYzqfl4vt0uhIiKmmFtQLKT6N0+6L5eXLs6pwZlcsjsjHgR1/q0DLtDFRbxSkXSrDFAtsv YILCvy/Pr9m1XUKwj1ZkmUEoKCwFmsig5jPcc1HnAZaTvUaZ8d/vqy+2mz+Vaga3XD2ErOukpLA IZh1lmfcX4zKjxXG2RSa/WJkWykR7jlU/7TibUPR8IceD0St9DCr3Bdt9ETjL0B76SB0NZ7a1V4 RdrnPRuOJ7PbqhGVJCjeRuwiKosjbIjZ/mXXOy6zrPcTP6Oz0Sys4KWUxHItFF93RZ2lRSFp40O HjZFQyNA6nHN9XL06A70RmheAPWJlFb55upxdsO8Ne2xUNkCH3rl1Ajj5DcDUsQ== X-Received: by 2002:a05:622a:58cd:b0:51a:89db:95a4 with SMTP id d75a77b69052e-51c8b2bdfecmr69627311cf.6.1783595716216; Thu, 09 Jul 2026 04:15:16 -0700 (PDT) X-Received: by 2002:a05:622a:58cd:b0:51a:89db:95a4 with SMTP id d75a77b69052e-51c8b2bdfecmr69626741cf.6.1783595715754; Thu, 09 Jul 2026 04:15:15 -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-47a9e4d843csm49838232f8f.14.2026.07.09.04.15.12 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 09 Jul 2026 04:15:14 -0700 (PDT) Message-ID: <954fe87d-9d43-4819-9f5a-eb0e5e5affea@oss.qualcomm.com> Date: Thu, 9 Jul 2026 13:15:11 +0200 Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [patch 03/18] entry: Provide [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> <20260707190253.816918647@kernel.org> From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20260707190253.816918647@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX/iA98RRxZGyC AtC3JFk0+qNM2Dsyt7Der03l/tG3am++4B0xPXrnB7dWqVngaAdSh1anV62wPg3mgxOmHoACVcE h2n5UlYkjtUpGTLMJ9KSDfF01faS550= X-Proofpoint-GUID: 8DhBGodlASfXB5B81_PzsKuHLNG8YA4V X-Authority-Analysis: v=2.4 cv=cL3QdFeN c=1 sm=1 tr=0 ts=6a4f82c4 cx=c_pps a=EVbN6Ke/fEF3bsl7X48z0g==: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=3WHJM1ZQz_JShphwDgj5:22 a=VwQbUJbxAAAA:8 a=EUspDBNiAAAA:8 a=vLKI4MkW7k7maJ7H7gsA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=a_PwQJl-kcHnX1M80qC6:22 X-Proofpoint-ORIG-GUID: 8DhBGodlASfXB5B81_PzsKuHLNG8YA4V X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX+u2hxmwmMR0O BLSMGVXZdjihRj+DiR19yVxFxstqhTURMIql+4Bhfyf+0KpX5tF2wMvQ+ZnyphYTaF+vCwA96tz oFnPvCAiqa5adZvqe5L4b0IYJH6RGCnAIlHYnvf1Xo6Q8r4knogU9FhbaTikkDHzck1JcFPHZLY Xe8x88o3a6IofLlIUPROhDWfI+VNeIjcoZvIUpzC4IsOfzO8A9f3APPvtwAtkjnKkapRQv+gz6z Gbrvk6kwnxGgDoq1/brJBu82T/uJxs1gdr5GO0E7jHQfSWk2WhA5AEWairiRzitGk9vsbovfaHy eUW61z/c+onVqFCjXyiTaOueyVda1ZrEoseld+g9PE/Asi+v/1Rg2qY7GaOiudT7W6YBh1gBdMO 3fTttyuURZTslJeY2O5ETymGa1Yo2KnX3C8VTx9IZhUEuDcgCmclj0CzZrtLXwzEDOQx03s1q6I 0LNfDzAoCZkjTQVa1OQ== 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 priorityscore=1501 impostorscore=0 suspectscore=0 adultscore=0 spamscore=0 phishscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=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: > Randomizing the syscall stack can only happen after state is established > via enter_from_user_mode() or syscall_enter_from_user_mode(). The earlier > it happens the better. > > Provide two new macros to consolidate that: > > - enter_from_user_mode_randomize_stack() > enter_from_user_mode(); > add_random_kstack_offset_irqsoff(); > > - syscall_enter_from_user_mode_randomize_stack() > enter_from_user_mode_randomize_stack(); > syscall_enter_from_user_mode_work(); > > to reduce boiler plate code. > > Those are macros and not inline functions as the latter would limit the > stack randomization scope to the inline function itself. > > Signed-off-by: Thomas Gleixner > --- > include/linux/entry-common.h | 56 +++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 56 insertions(+) Reviewed-by: Philippe Mathieu-Daudé