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 2BD3D31ED83 for ; Thu, 9 Jul 2026 11:16:28 +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=1783595791; cv=none; b=JnG/cev36+qn8cEs/DL8NzyGHTHO2viD18U3/ChwkioFYFkMZGIK6EaGsLMihYW/wm5Wjm4rJDh+6ei9RtWM6bPSaOMFpsAgJNwhOcPxQ5uREfCi1ijy2j0ufzmyT5pDfRF8GdNxnV5rrw2uM3sBptSOCpkiTEgB66B+grMo9+c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783595791; c=relaxed/simple; bh=khehXiLJiCSvkVxdEgobbE7CP/Mf6o7o044NnO1eP4g=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lxMzf8m5nZbK5gnVhfz0YYm1pKIdrdJEgMi7FkSQr2tMPmbRnskkQI9lHamSaIvRdZ53UfL3PnmaJmCAdRPDstWf/vClRbw0ENTdl/SpgUnlN22ozi8D7V1NeJH0sK9a5AKOIqzVq8V9Zoes6Wh2A24m0n1nS/QoSV9TJQM8E7w= 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=i6Z+l6cz; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b=Ag/SrbdG; 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="i6Z+l6cz"; dkim=pass (2048-bit key) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com header.b="Ag/SrbdG" Received: from pps.filterd (m0279869.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 669AxaP91619438 for ; Thu, 9 Jul 2026 11:16:27 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-f72.google.com (mail-qv1-f72.google.com [209.85.219.72]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4f9sqsbxee-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-f72.google.com with SMTP id 6a1803df08f44-8fdace20927so21993886d6.2 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=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=lQNxQw6rO9fLZuzYn+ybwybDNA8F5Y/5chm6JwlKasE=; b=Ag/SrbdGUN8YwevKN60f9TpkRi7MJt6/BNfS37YQFmPHeHSx3laUoMgitr96H5QhOd o8EjDmh61KKjgNd1zttP6futg8bxxbP47cKdvTIz2KeeDHVAkElMvq93BEVC5NfvuFAx MRxUjZpkns+njyUCUHuXfEyZMKxpXo1ZC1Q9rMkIpGsiqVCZSinHAdD7dtvRiDAHjs0F xhQeQlD/SubDG5+cJ1w8LEpEbcfLDwRmXPq1/cXqL0qsGxD+sRjZQBctQy63laQj9AT5 1imZXsBLxHjeUYPZZw67h9B8raHgwSVBx+6D+MhgLkNMiWCZRDER8kVZuMgfTlSjuYGD ab+Q== 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=OuSFbv60n3lWFUpuKrODo9enbrRZWz4w1ue13izUBdEKysARKOLxM1IzRXgrFm3uNl oNZc82N67jXVH6bk6QHyK9tH1yBJGoaBWR7P+t4VkfN+GuPzfi0iih5IITRt2bGy3tjp A1Nsehw1lo16ZytlBLbMLTnVcg5ll8CELLnF4dpl6/vtDFow8vUj1c+W34JEaq3fciin rEEFd3gIL02IV7lHgorQ/irnNcvvDYB3i2izlR8ROdu41dLQUaIHQXFMJP/ru4R43gbE zefymFpAgaeKkay/xadlbDEqd6BQ7hOcdhGBIzapdIHhdUB5+9NMOoMl8uorVccqaQZm Xclw== X-Forwarded-Encrypted: i=1; AHgh+RpaORLBbrgjuoMm8GVF/xyUDKuLMSv6u0bbTNXRKLmF26kwGGEMr19bqmrREa5xYBkKVBb3th4IHJX1myA=@vger.kernel.org X-Gm-Message-State: AOJu0Yxqn3qCk3wCJU9yQWYHIG/WEvDByFgGvmCnx2Bg0T4nLHLRfTRU UKwy9c+UP5jbyF50s64mFcD20NTF84zlU3i/0l8sIl5tDa6DGB+CHN1uJoQ3HliHod4KH+VIPUb w1EeAPDNb4vLYC4uwAzK+v3+qEZ3892Vtth4LkWkLKS+rVbx6qfL031Ix0rmQEPh+x8M= X-Gm-Gg: AfdE7cmcIDJRmvmefpkZmyRMIu7dWTtKlNxSfHAOlEFahOXaHDPwKm1wp9Sna09DylB b15hVWwsrg52yLUSA3x2LozimA3YHGRrInsba+eU7yw26nmFqS3RRjgYqoo0QyFn53j0MW9CN78 MQXKb30DPBb/oYvwEM0BFSfqKpqkvwEkjFat0HeHCj4AN/IST3uHzJlJE1QliIzDKbYmEnjmYeK gS6EzJBr8dJl34Y/5ElcwYgQ8NXea5fp5+S7OQPA5pU4dmZOfWW+RoEpBu7+13CZH/7RBFMCNX9 IbhzsMDGRU0NqqkT+F3MDp/URKB5tPh0ZzvS8flVWFtXE2wNatirlsaL8lIwMkxDpGxRydC1Ea8 X+q8z67k9KcNpMGsi+e12jnHZtkWlcpDZddeQPfdbW37/X+k9T9Z3qSr3YJwvFA== X-Received: by 2002:ac8:5a94:0:b0:51c:22c5:daf4 with SMTP id d75a77b69052e-51c8b3033demr72818171cf.28.1783595785862; 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 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: 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-Info: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfXw3B6LesvKHt7 TfXuE40CDRo2Buz8hvEyj79aLHG9yzv74NxjZ9wW7dgKCQ4KzmgH4y/c9oh5nXqrdyqVGM8WDxf Q3wXkwh8o9WhOiKLHer0g6v9iybJTr8= X-Proofpoint-GUID: 5FGrszPM34vsHFy3gahnqS5fHxTjN1s9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA5MDEwOCBTYWx0ZWRfX4jMcoHpDS3eg rmM7exSg2NO31wf8ZSm2bzAH9VAN7xYKGwIME1prKg07QEZEMwlUmEYDckiTIlgu4sRx55UzOiQ TDHhoCEYV5ZBQQ+oaed6B8jQyfa+9hK54bUu3SiPM3wDApmB0jWbroSVlwRDh2AcoVTObk2PsoA F+tisfIxD/ILvZE+qe9dMAimGEFt48u7KnpkHtun797BCyuFe7fqyY1bJuL8rNsMS+k0fdk37IZ bJruR15sXWLmDQo3Yb2LYcWyMPUNlcOsDtJ0OflrsVw3dDkq2MA9NtFrdlYCIKc/gl+COZMLCKt nZVbSH41gmgEMTM0I4e003I4n5K1DsQW5qaQVVv0k2kFCaQRa0GWVzHKSfBb2GQAK9cJXAbfZDd psUnVlV+7UUqaBPsqeFWuaAw8JEaqCFBXq0K1h2RWuhO8in87Klq9myRwUSEg+d8Wc4dRICUS2w UQzXeTrMldlTfwTtOPA== X-Authority-Analysis: v=2.4 cv=Sv2gLvO0 c=1 sm=1 tr=0 ts=6a4f830a cx=c_pps a=7E5Bxpl4vBhpaufnMqZlrw==: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=_glEPmIy2e8OvE2BGh3C:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=voM4FWlXAAAA:8 a=EUspDBNiAAAA:8 a=DoJJhcVa48uSEvU2-xUA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=pJ04lnu7RYOZP9TFuWaZ:22 a=IC2XNlieTeVoXbcui8wp:22 X-Proofpoint-ORIG-GUID: 5FGrszPM34vsHFy3gahnqS5fHxTjN1s9 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 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 phishscore=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