From nobody Sat Feb 7 15:11:59 2026 Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (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 DCDFB366046; Tue, 27 Jan 2026 15:07:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769526423; cv=none; b=BNDIETzm428DKCyN+7kLvYxrMu+cJzOg/+PshjBtkN6nqd4mfQCk89+xEJS2ao9qan83nZL73lEnnCQBniYI7k3xv+HgThRwb82iV19Ay5XL7r40UcIuFZGuU2BcdZW6t2cnv83JrdM/c7OAzIwRu8JhraLOvDdlOxGapOTnh9c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769526423; c=relaxed/simple; bh=BuSEtfdW37CYHXk4kRFlCk48bOdRffJ20FCnjnOvIe8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fqhYJm09OPMg24F0+6iwUklVYg9w1tfGiDCRvyxzVlNcEVCmz2VOhl97uoGdzDaaQLpkcnbUovEfy3VDOW0BGnzq+o7KdyYNQWq/mBlB/jpDlTXKDJkxllHu71KkNU8MK84qx/mWQogK/9WAQnHygzwqbFfdQbXwTfRxC6FWYl0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=pFZvMSDU; arc=none smtp.client-ip=148.163.158.5 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="pFZvMSDU" Received: from pps.filterd (m0353725.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 60R7XYbd028672; Tue, 27 Jan 2026 15:06:04 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:date:from:in-reply-to:message-id :mime-version:references:subject:to; s=pp1; bh=4adnvlRASqyynXmCG JAHcQWpHowlKMkoygtl7xi1WSs=; b=pFZvMSDUEUAfP1DmE3zEnX5ZY5VxwCjCN 3axQRjpXjPru3P/nmqXez27G9kh6xMNRvpp9MKVYSrH6aZ+EECXaWmX6xGIWhQ9f VCNzaBhj7VNOtVrBIYUyKb3aPpx29m0TPwuz1pJqx5OBvPfEwfDlzs/HX2h7/FBp CKB2a7LSBfgc/CbMuYv846uJvVoVvEK1xhEui2NbwBoM3cpB+F5Zt1lrLgRvIWxE s1YWeFvuwkxtdzHer6fQVOYVwZTf1C/6xOioxzNQrJbW09GzHdKHDBiPEFvOQ5h4 1w+vW6c4JYD98deQXJU6cOoxjzit53NXvH/hQAYdgRcm+FtdHFzsQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4bvmgfvde9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:04 +0000 (GMT) Received: from m0353725.ppops.net (m0353725.ppops.net [127.0.0.1]) by pps.reinject (8.18.1.12/8.18.0.8) with ESMTP id 60REvWsW005540; Tue, 27 Jan 2026 15:06:03 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4bvmgfvddy-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:03 +0000 (GMT) Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 60REWmD0023635; Tue, 27 Jan 2026 15:06:02 GMT Received: from smtprelay01.fra02v.mail.ibm.com ([9.218.2.227]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 4bwamjrwhs-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 27 Jan 2026 15:06:02 +0000 Received: from smtpav06.fra02v.mail.ibm.com (smtpav06.fra02v.mail.ibm.com [10.20.54.105]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 60RF5w4H62259704 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 27 Jan 2026 15:05:58 GMT Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1EE2920040; Tue, 27 Jan 2026 15:05:58 +0000 (GMT) Received: from smtpav06.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BB6DB2004D; Tue, 27 Jan 2026 15:05:57 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 27 Jan 2026 15:05:57 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, bpf@vger.kernel.org, x86@kernel.org, linux-mm@kvack.org, Steven Rostedt Cc: Jens Remus , Josh Poimboeuf , Masami Hiramatsu , Mathieu Desnoyers , Peter Zijlstra , Ingo Molnar , Jiri Olsa , Arnaldo Carvalho de Melo , Namhyung Kim , Thomas Gleixner , Andrii Nakryiko , Indu Bhagat , "Jose E. Marchesi" , Beau Belgrave , Linus Torvalds , Andrew Morton , Florian Weimer , Kees Cook , "Carlos O'Donell" , Sam James , Dylan Hatch , Borislav Petkov , Dave Hansen , David Hildenbrand , "H. Peter Anvin" , "Liam R. Howlett" , Lorenzo Stoakes , Michal Hocko , Mike Rapoport , Suren Baghdasaryan , Vlastimil Babka , Heiko Carstens , Vasily Gorbik , "Steven Rostedt (Google)" Subject: [PATCH v13 03/18] x86/uaccess: Add unsafe_copy_from_user() implementation Date: Tue, 27 Jan 2026 16:05:38 +0100 Message-ID: <20260127150554.2760964-4-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260127150554.2760964-1-jremus@linux.ibm.com> References: <20260127150554.2760964-1-jremus@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=Z4vh3XRA c=1 sm=1 tr=0 ts=6978d45c cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VwQbUJbxAAAA:8 a=7d_E57ReAAAA:8 a=JfrnYn6hAAAA:8 a=yPCof4ZbAAAA:8 a=mDV3o1hIAAAA:8 a=yMhMjlubAAAA:8 a=VnNF1IyMAAAA:8 a=Z4Rwk6OoAAAA:8 a=20KFwNOVAAAA:8 a=7mOBRU54AAAA:8 a=meVymXHHAAAA:8 a=gpC398cPzQKiNBT45cIA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-GUID: wWLAwxKLDR56egnD3ibSJEftoBpl7R4C X-Proofpoint-ORIG-GUID: fPKE0b2Hahn9KHpZXBsmmNBym3BITZQD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTI3MDEyMSBTYWx0ZWRfXxpJQvjvhXrz6 JHEkZjiGQa+4O4Ml6OB4AchVLY0fRaNlYlXGP0hjW9qQyGnt1LONySFIm3bPWtYw+Y11aeHTESB /VNubUEMF/CHJc/bRg0uJFR4GUuv2VHZqRZosr/wnLPNR8sdw4E86uEcMAGpTPuxRzxCxvtD921 6dNDvBmBLpbg8caFX2ujHJgmY38AoPSJbbyDBgeL5X79Rjjp/h2e7Gzw99700SYNeDNMyLvuiEK nBMhE6qY8cLqI0A6q6io44czFB73cnxG74IzFJt7fg9tAh2hXDL24NtjIRa/FVSXwve3riwFEd6 Cdu+gYKQzWgJrVXt8MC3qZboqfRltGdVyb0sHu4lwPvmykEF3aiXI+buYhTbnJNlDfRLlNQwWJi Z/6Rh05mx2QnFfRaVPiAZVekS7nSH/dJcqBUOj+UZkZr2rsxtzxSeCwiCkCrXoX3tGg+9/qHrXP n62TpMipDO6bKmUNDIA== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-01-27_03,2026-01-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 phishscore=0 priorityscore=1501 bulkscore=0 adultscore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601270121 Content-Type: text/plain; charset="utf-8" From: Josh Poimboeuf Add an x86 implementation of unsafe_copy_from_user() similar to the existing unsafe_copy_to_user(). Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Jiri Olsa Cc: Arnaldo Carvalho de Melo Cc: Namhyung Kim Cc: Thomas Gleixner Cc: Andrii Nakryiko Cc: Indu Bhagat Cc: "Jose E. Marchesi" Cc: Beau Belgrave Cc: Jens Remus Cc: Linus Torvalds Cc: Andrew Morton Cc: Florian Weimer Cc: Sam James Cc: Kees Cook Cc: "Carlos O'Donell" Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Signed-off-by: Jens Remus --- arch/x86/include/asm/uaccess.h | 39 +++++++++++++++++++++++++--------- 1 file changed, 29 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 367297b188c3..dfe143235967 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -598,7 +598,7 @@ _label: \ * We want the unsafe accessors to always be inlined and use * the error labels - thus the macro games. */ -#define unsafe_copy_loop(dst, src, len, type, label) \ +#define unsafe_copy_to_user_loop(dst, src, len, type, label) \ while (len >=3D sizeof(type)) { \ unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \ dst +=3D sizeof(type); \ @@ -606,15 +606,34 @@ _label: \ len -=3D sizeof(type); \ } =20 -#define unsafe_copy_to_user(_dst,_src,_len,label) \ -do { \ - char __user *__ucu_dst =3D (_dst); \ - const char *__ucu_src =3D (_src); \ - size_t __ucu_len =3D (_len); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label); \ - unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \ +#define unsafe_copy_to_user(_dst, _src, _len, label) \ +do { \ + void __user *__dst =3D (_dst); \ + const void *__src =3D (_src); \ + size_t __len =3D (_len); \ + unsafe_copy_to_user_loop(__dst, __src, __len, u64, label); \ + unsafe_copy_to_user_loop(__dst, __src, __len, u32, label); \ + unsafe_copy_to_user_loop(__dst, __src, __len, u16, label); \ + unsafe_copy_to_user_loop(__dst, __src, __len, u8, label); \ +} while (0) + +#define unsafe_copy_from_user_loop(dst, src, len, type, label) \ + while (len >=3D sizeof(type)) { \ + unsafe_get_user(*(type *)(dst), (type __user *)(src), label); \ + dst +=3D sizeof(type); \ + src +=3D sizeof(type); \ + len -=3D sizeof(type); \ + } + +#define unsafe_copy_from_user(_dst, _src, _len, label) \ +do { \ + void *__dst =3D (_dst); \ + void __user *__src =3D (_src); \ + size_t __len =3D (_len); \ + unsafe_copy_from_user_loop(__dst, __src, __len, u64, label); \ + unsafe_copy_from_user_loop(__dst, __src, __len, u32, label); \ + unsafe_copy_from_user_loop(__dst, __src, __len, u16, label); \ + unsafe_copy_from_user_loop(__dst, __src, __len, u8, label); \ } while (0) =20 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT --=20 2.51.0