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Wed, 22 Oct 2025 14:43:30 GMT Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A355A20043; Wed, 22 Oct 2025 14:43:30 +0000 (GMT) Received: from smtpav07.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 3B9E32004D; Wed, 22 Oct 2025 14:43:30 +0000 (GMT) Received: from tuxmaker.lnxne.boe (unknown [9.152.85.9]) by smtpav07.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 22 Oct 2025 14:43:30 +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 , 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 v11 05/15] x86/uaccess: Add unsafe_copy_from_user() implementation Date: Wed, 22 Oct 2025 16:43:16 +0200 Message-ID: <20251022144326.4082059-6-jremus@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251022144326.4082059-1-jremus@linux.ibm.com> References: <20251022144326.4082059-1-jremus@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDE4MDAyMiBTYWx0ZWRfX92n2m39iUTtF Fg7EZnLqu3cPrzjV9i2XkBrAVN/IOSbKbJASYKg+q7zizo78XQmtxfC4KbUx0Wqe65c3aPb5aQb gEnryojjSjAhLmFnrtXUBvCoW3rz+PEgdMB6UNS0NCSZkr/wr/lOhql5HW7bgNi6e/QWCgwZdrL ISDcKWbk60R7ujpUNcP+cdRdYnYT3Qrt/+0p8aC2fnH1g36dtnKbDdTsloRvn0GA0UfMOi1glkv tCLwQy5hm+ELIYq2EET/HDQT2egK1nUsW7dslX1m1JDLosphNPKCOTVprGSA1Q1hcQ3Rey7UPE5 WB777bGP0GfWOTngoLgy93Eo1dqS/R/VaQQ/qYZ0nyupdeby0DD2Bw3bR5OlWqWg8h4q9+but9k 5zTZmUPCpqasjkeFBOFlkrbVhzEZwQ== X-Authority-Analysis: v=2.4 cv=OrVCCi/t c=1 sm=1 tr=0 ts=68f8ed98 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=x6icFKpwvdMA: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=yMDg07iuMX7FxPBFrYIA:9 a=jhqOcbufqs7Y1TYCrUUU:22 a=1CNFftbPRP8L7MoqJWF3:22 a=HkZW87K1Qel5hWWM3VKY:22 a=wa9RWnbW_A1YIeRBVszw:22 a=2JgSa4NbpEOStq-L5dxp:22 a=DXsff8QfwkrTrK3sU8N1:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=bWyr8ysk75zN3GCy5bjg:22 X-Proofpoint-GUID: y5DtCLccp4sD_fajLJlhEc0XG358nHlw X-Proofpoint-ORIG-GUID: Xr8P_8No_goqu17G9N_vjmUJF036Z68R X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-22_05,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 adultscore=0 priorityscore=1501 spamscore=0 phishscore=0 clxscore=1011 bulkscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2510020000 definitions=main-2510180022 X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 8C2848000F X-Stat-Signature: hierpi16t8omh8zffa6iurk6nogxbufa X-Rspam-User: X-HE-Tag: 1761149891-932541 X-HE-Meta: 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 0iZmlIKx 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 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(). 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 3a7755c1a441..3caf02d0503e 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -599,7 +599,7 @@ _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); \ @@ -607,15 +607,34 @@ _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 -- 2.48.1