{"id":2229056,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229056/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-um/patch/5b09e58a84c9edcfe5724db5cd57e45d96a96bfa.1777306795.git.chleroy@kernel.org/","project":{"id":60,"url":"http://patchwork.ozlabs.org/api/1.1/projects/60/?format=json","name":"User-mode Linux Development","link_name":"linux-um","list_id":"linux-um.lists.infradead.org","list_email":"linux-um@lists.infradead.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<5b09e58a84c9edcfe5724db5cd57e45d96a96bfa.1777306795.git.chleroy@kernel.org>","date":"2026-04-27T17:13:49","name":"[RFC,v1,8/9] arm64: Add unsafe_copy_from_user()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"9b83fad888c09ba519a98157b628df551d07a21f","submitter":{"id":92089,"url":"http://patchwork.ozlabs.org/api/1.1/people/92089/?format=json","name":"Christophe Leroy (CS GROUP)","email":"chleroy@kernel.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-um/patch/5b09e58a84c9edcfe5724db5cd57e45d96a96bfa.1777306795.git.chleroy@kernel.org/mbox/","series":[{"id":501693,"url":"http://patchwork.ozlabs.org/api/1.1/series/501693/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-um/list/?series=501693","date":"2026-04-27T17:13:41","name":"uaccess: Convert small fixed size copy_{to/from}_user() to scoped user access","version":1,"mbox":"http://patchwork.ozlabs.org/series/501693/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229056/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229056/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=gL8c6A0R;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=lp9wELlr;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help\n\t:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding:\n\tMIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:\n\tReply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From:\n\tResent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner;\n\tbh=pZNMFYuU8CchD1nM5e7lml3XtY3zMVnrOrvqbhM+lqI=; b=gL8c6A0RdyKsMFGek5jYD28o4b\n\tnvvRGDUZ6vaqZX7+twYPDUJemzBFq9VuxvaaGsMlZniGeeVEC8JEW+f6Avp2OU686mLn4zedbzK/V\n\tekXp2cUccB6o54p9NrJkF56kmqePaUbCnGVpp+H60YjpAbKl3eHRWeV7Le/TxStOecQD0E5fN0/tg\n\t6w0Fhb9e1gfNzryb8yyZvoe4MSWaSHzJwa4fvZu9ew65hHnbwi8+XCwyr0631oGzXqyLILWjLARd6\n\t/GcRlJzioddxWiN9Meda7dOUmzaxE/vPkiQ/eTD7Xo+BBX1sPnNXdTD0F2nbOwj8vaHk42w8COhlw\n\tuS4mwHYQ==;","v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777310352;\n\tbh=vbZIj5I8a11ig9c375SeIMkNInKGe+jckYb8HPag1tw=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=lp9wELlrvJvoeuCK0/zMI5UANnrsQ+T4se/gBOunN8iQDrEi1RstW5G65/9vUEPmI\n\t U9UXqoktuU7EViGdT+8yzDZHjl2N0E5vd9veY8uQePuAD9x0oGHf4CotQwSmAD24go\n\t gSXTECesL9+kQmgNOk7myjSgr8UboLxcnh/OrEADTLSIqRqZRx4YwXDl6QWc3wVNsO\n\t sB/2ZwfKCyhos7Vj9aXXCgNggtmoXoIYLpWXmI9TjsLctEcOG8w3vDT/K6+fVh16nS\n\t /UcGgkCV5vp5qC1VRJeMqVPGsaV7+wscOAZaxlqKS8j4DsLjsIu1iQmtuFIX3tL+zm\n\t kvFBNXQR3j5iw=="],"From":"\"Christophe Leroy (CS GROUP)\" ","To":"Yury Norov ,\n\tAndrew Morton ,\n\tLinus Torvalds ,\n\tDavid Laight ,\n\tThomas Gleixner ","Cc":"\"Christophe Leroy (CS GROUP)\" ,\n\tlinux-alpha@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-snps-arc@lists.infradead.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-mips@vger.kernel.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tkvm@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-s390@vger.kernel.org,\n\tsparclinux@vger.kernel.org,\n\tlinux-um@lists.infradead.org,\n\tdmaengine@vger.kernel.org,\n\tlinux-efi@vger.kernel.org,\n\tlinux-fsi@lists.ozlabs.org,\n\tamd-gfx@lists.freedesktop.org,\n\tdri-devel@lists.freedesktop.org,\n\tintel-gfx@lists.freedesktop.org,\n\tlinux-wpan@vger.kernel.org,\n\tnetdev@vger.kernel.org,\n\tlinux-wireless@vger.kernel.org,\n\tlinux-spi@vger.kernel.org,\n\tlinux-media@vger.kernel.org,\n\tlinux-staging@lists.linux.dev,\n\tlinux-serial@vger.kernel.org,\n\tlinux-usb@vger.kernel.org,\n\txen-devel@lists.xenproject.org,\n\tlinux-fsdevel@vger.kernel.org,\n\tocfs2-devel@lists.linux.dev,\n\tbpf@vger.kernel.org,\n\tkasan-dev@googlegroups.com,\n\tlinux-mm@kvack.org,\n\tlinux-x25@vger.kernel.org,\n\trust-for-linux@vger.kernel.org,\n\tlinux-sound@vger.kernel.org,\n\tsound-open-firmware@alsa-project.org,\n\tlinux-csky@vger.kernel.org,\n\tlinux-hexagon@vger.kernel.org,\n\tloongarch@lists.linux.dev,\n\tlinux-m68k@lists.linux-m68k.org,\n\tlinux-openrisc@vger.kernel.org,\n\tlinux-parisc@vger.kernel.org,\n\tlinux-sh@vger.kernel.org,\n\tlinux-arch@vger.kernel.org","Subject":"[RFC PATCH v1 8/9] arm64: Add unsafe_copy_from_user()","Date":"Mon, 27 Apr 2026 19:13:49 +0200","Message-ID":"\n <5b09e58a84c9edcfe5724db5cd57e45d96a96bfa.1777306795.git.chleroy@kernel.org>","X-Mailer":"git-send-email 2.49.0","In-Reply-To":"","References":"","MIME-Version":"1.0","X-Developer-Signature":"v=1; a=openpgp-sha256; l=2498; i=chleroy@kernel.org;\n h=from:subject:message-id; bh=vbZIj5I8a11ig9c375SeIMkNInKGe+jckYb8HPag1tw=;\n b=owGbwMvMwCV2d0KB2p7V54MZT6slMWS+nxmbKDOhb/vkF5+62Iv+nzi0lmWmkWf+tSO3HK9yP\n D89hV+LoaOUhUGMi0FWTJHl+H/uXTO6vqTmT92lDzOHlQlkCAMXpwBMJCKWkeGFnFP5dUbGE1cO\n pXr18eg3ndoc9ubDcl2tYxbdt9o1nmkyMvQuDCp+FV4TvfDP3c6+r/YFCyvUNTZlcrea/2SZ/OM\n dBwcA","X-Developer-Key":"i=chleroy@kernel.org; a=openpgp;\n fpr=10FFE6F8B390DE17ACC2632368A92FEB01B8DD78","Content-Transfer-Encoding":"8bit","X-BeenThere":"linux-um@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Sender":"\"linux-um\" ","Errors-To":"linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"},"content":"At the time being, x86 and arm64 are missing unsafe_copy_from_user().\n\nAdd it.\n\nSigned-off-by: Christophe Leroy (CS GROUP) \n---\n arch/arm64/include/asm/uaccess.h | 29 ++++++++++++++++++++++++-----\n 1 file changed, 24 insertions(+), 5 deletions(-)","diff":"diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h\nindex 1e20ec91b56f..adfdb52cd82b 100644\n--- a/arch/arm64/include/asm/uaccess.h\n+++ b/arch/arm64/include/asm/uaccess.h\n@@ -437,7 +437,7 @@ static inline void user_access_restore(unsigned long enabled) { }\n * We want the unsafe accessors to always be inlined and use\n * the error labels - thus the macro games.\n */\n-#define unsafe_copy_loop(dst, src, len, type, label)\t\t\t\t\\\n+#define unsafe_put_loop(dst, src, len, type, label)\t\t\t\t\\\n \twhile (len >= sizeof(type)) {\t\t\t\t\t\t\\\n \t\tunsafe_put_user(*(type *)(src),(type __user *)(dst),label);\t\\\n \t\tdst += sizeof(type);\t\t\t\t\t\t\\\n@@ -450,10 +450,29 @@ do {\t\t\t\t\t\t\t\t\t\\\n \tchar __user *__ucu_dst = (_dst);\t\t\t\t\\\n \tconst char *__ucu_src = (_src);\t\t\t\t\t\\\n \tsize_t __ucu_len = (_len);\t\t\t\t\t\\\n-\tunsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label);\t\\\n-\tunsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label);\t\\\n-\tunsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label);\t\\\n-\tunsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label);\t\\\n+\tunsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label);\t\\\n+\tunsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label);\t\\\n+\tunsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label);\t\\\n+\tunsafe_put_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label);\t\\\n+} while (0)\n+\n+#define unsafe_get_loop(dst, src, len, type, label)\t\t\t\t\\\n+\twhile (len >= sizeof(type)) {\t\t\t\t\t\t\\\n+\t\tunsafe_get_user(*(type __user *)(src),(type *)(dst),label);\t\\\n+\t\tdst += sizeof(type);\t\t\t\t\t\t\\\n+\t\tsrc += sizeof(type);\t\t\t\t\t\t\\\n+\t\tlen -= sizeof(type);\t\t\t\t\t\t\\\n+\t}\n+\n+#define unsafe_copy_from_user(_dst,_src,_len,label)\t\t\t\\\n+do {\t\t\t\t\t\t\t\t\t\\\n+\tchar *__ucu_dst = (_dst);\t\t\t\t\t\\\n+\tconst char __user *__ucu_src = (_src);\t\t\t\t\\\n+\tsize_t __ucu_len = (_len);\t\t\t\t\t\\\n+\tunsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u64, label);\t\\\n+\tunsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u32, label);\t\\\n+\tunsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u16, label);\t\\\n+\tunsafe_get_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label);\t\\\n } while (0)\n \n extern unsigned long __must_check __arch_clear_user(void __user *to, unsigned long n);\n","prefixes":["RFC","v1","8/9"]}