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Tue, 5 May 2026 12:17:22 +0000 (GMT) From: Jens Remus To: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, x86@kernel.org, Steven Rostedt , Josh Poimboeuf , Indu Bhagat , Peter Zijlstra , Dylan Hatch , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Mathieu Desnoyers , Kees Cook , Sam James Cc: Jens Remus , bpf@vger.kernel.org, linux-mm@kvack.org, Namhyung Kim , Andrii Nakryiko , "Jose E. Marchesi" , Beau Belgrave , Florian Weimer , "Carlos O'Donell" , Masami Hiramatsu , Jiri Olsa , Arnaldo Carvalho de Melo , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Heiko Carstens , Vasily Gorbik , Ilya Leoshkevich , "Steven Rostedt (Google)" Subject: [PATCH v14 04/19] x86/uaccess: Add unsafe_copy_from_user() implementation Date: Tue, 5 May 2026 14:17:03 +0200 Message-ID: <20260505121718.3572346-5-jremus@linux.ibm.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260505121718.3572346-1-jremus@linux.ibm.com> References: <20260505121718.3572346-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA1MDExNCBTYWx0ZWRfX0ihancRXGt18 IJyGZUNmBcdxherEL9XDBqFi4UN2bl8lc7rvenJ4XR1yTQCEpuIGpBsBKpuLuN2FabrdAXx9j5N XM9G6pf5t5G/J+Yv6LavDjt/Y58BfuZQKUTMv2L89oFYLmGxMfSVMX5l7tU2gCGYGuCwIxjBdy/ KNERiGkGifCQQs/YfrAQMXlvAfN2nMR8U4ADMEjRyqdA71NztLqpbFvJZkIxC7XBId/jUlZkHWx xQXUUc7aaOeyWYS1xhq+hv1hkZW2PbvvPzHd81xbcyNI8DtZz9x7rCTTddjnQ3fKG47ko33hk60 VjuMCZJzdMWzyYtpFK4c/ImOgvHMZs4L7FFzquAwSX+GbWyqX//6heV+0KI14c374rhIWnAfXD/ QPT2HNS6MiE02BAJy4h8bVOLLQPogUAYMOumG6h4CYOB3uOACP11bSOBqeYeHE0ohXCtMr9z9M+ 8wW08tLZ1GXf69M7LHw== X-Proofpoint-GUID: 3xPfsk7dxks5BRMKUV_Iwiir8jU8tnjU X-Proofpoint-ORIG-GUID: hJbz80oBTd2cuT1HmERswDPItq9JtWhh X-Authority-Analysis: v=2.4 cv=eu/vCIpX c=1 sm=1 tr=0 ts=69f9dfd8 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=meVymXHHAAAA:8 a=pGLkceISAAAA:8 a=VnNF1IyMAAAA:8 a=-G4kms3_kQfBhqX38bYA:9 a=2JgSa4NbpEOStq-L5dxp:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-05_02,2026-04-30_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1015 adultscore=0 suspectscore=0 malwarescore=0 bulkscore=0 impostorscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605050114 X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: C66604000D X-Stat-Signature: yrgtt3rf53tajyoc8r4q1ebkaxfuhcww X-HE-Tag: 1777983493-441966 X-HE-Meta: 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 U4Pvj50s 7TXGMAF0CLbcJ1/T02stXC+8c/mxPfWc+rOt6NlZjhj93ozkhpGeE4X+MyBD72lKAjbBk5J/tcSyMMK8x1xrMiGo3AqFWXS5yiXfK0zU6rvO2ZtxO6rOJJkoh/qAAPuURXeNyOhPAtKwwotTZqtnTwhj09htip9XIQssm3OOhUd8ywN39AX4ihqXp5HFSlvYobPZTHT+4UAjGUocarN+nuklSVRXJTEHDc808o/ed1LLJORt37DJqEfkG5CGV3Yyue+UO8CRLE2ja7rT+cxV5UqEX+FutHMYtvhCkNgWCz6w1UUICIVH2w+v/lHgMA0ow8t62c9o57d37RsN7DzTlyug2hcXF9rVpHtcS Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Josh Poimboeuf Add an x86 implementation of unsafe_copy_from_user() similar to the existing unsafe_copy_to_user(). Signed-off-by: Josh Poimboeuf Signed-off-by: Steven Rostedt (Google) Reviewed-by: Indu Bhagat 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 3a0dd3c2b233..79679779f1ea 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 >= sizeof(type)) { \ unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \ dst += sizeof(type); \ @@ -606,15 +606,34 @@ _label: \ len -= sizeof(type); \ } -#define unsafe_copy_to_user(_dst,_src,_len,label) \ -do { \ - char __user *__ucu_dst = (_dst); \ - const char *__ucu_src = (_src); \ - size_t __ucu_len = (_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 = (_dst); \ + const void *__src = (_src); \ + size_t __len = (_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 >= sizeof(type)) { \ + unsafe_get_user(*(type *)(dst), (type __user *)(src), label); \ + dst += sizeof(type); \ + src += sizeof(type); \ + len -= sizeof(type); \ + } + +#define unsafe_copy_from_user(_dst, _src, _len, label) \ +do { \ + void *__dst = (_dst); \ + void __user *__src = (_src); \ + size_t __len = (_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) #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT -- 2.51.0