{"id":2229050,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2229050/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/patch/0ee46bb228d97163fbdc14f2a7c52b93d8bc34ce.1777306795.git.chleroy@kernel.org/","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.1/projects/2/?format=json","name":"Linux PPC development","link_name":"linuxppc-dev","list_id":"linuxppc-dev.lists.ozlabs.org","list_email":"linuxppc-dev@lists.ozlabs.org","web_url":"https://github.com/linuxppc/wiki/wiki","scm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git","webscm_url":"https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/"},"msgid":"<0ee46bb228d97163fbdc14f2a7c52b93d8bc34ce.1777306795.git.chleroy@kernel.org>","date":"2026-04-27T17:13:48","name":"[RFC,v1,7/9] x86: Add unsafe_copy_from_user()","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"c8386877599f25dd852e3a6093a029b948f11fda","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/linuxppc-dev/patch/0ee46bb228d97163fbdc14f2a7c52b93d8bc34ce.1777306795.git.chleroy@kernel.org/mbox/","series":[{"id":501691,"url":"http://patchwork.ozlabs.org/api/1.1/series/501691/?format=json","web_url":"http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=501691","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/501691/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2229050/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2229050/checks/","tags":{},"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linuxppc-dev@lists.ozlabs.org"],"Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\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=kdO2kRaq;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; 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a=openpgp-sha256; l=2390; i=chleroy@kernel.org;\n h=from:subject:message-id; bh=VVuQn2YnZFi2JH9uh9hmEqXb1BpygsXabSyFGnhBvmI=;\n b=owGbwMvMwCV2d0KB2p7V54MZT6slMWS+nxljeGSBfXj99HCNy2WTVFXXC9z/Hmi+//aE1/MbC\n +50nw1Q6ChlYRDjYpAVU2Q5/p9714yuL6n5U3fpw8xhZQIZwsDFKQAT2djH8D+e3yYgNP/F6xtd\n z9QNXjIccVycwR574E38S3tWp2uq95Yy/M9xKJ2hYJCUJV9391rVwmlfl7x6GzD19bqwZeyVdgF\n fZ3MAAA==","X-Developer-Key":"i=chleroy@kernel.org; a=openpgp;\n fpr=10FFE6F8B390DE17ACC2632368A92FEB01B8DD78","Content-Transfer-Encoding":"8bit","X-Spam-Status":"No, score=-0.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED,\n\tDKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.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/x86/include/asm/uaccess.h | 29 ++++++++++++++++++++++++-----\n 1 file changed, 24 insertions(+), 5 deletions(-)","diff":"diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h\nindex 3a0dd3c2b233..10c458ffa399 100644\n--- a/arch/x86/include/asm/uaccess.h\n+++ b/arch/x86/include/asm/uaccess.h\n@@ -598,7 +598,7 @@ _label:\t\t\t\t\t\t\t\t\t\\\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@@ -611,10 +611,29 @@ 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 #ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT\n","prefixes":["RFC","v1","7/9"]}