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GET /api/1.1/patches/2229047/?format=api
{ "id": 2229047, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2229047/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1a55107abe15dd78450888e2b5327c3a56af29b7.1777306795.git.chleroy@kernel.org/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/projects/2/?format=api", "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": "<1a55107abe15dd78450888e2b5327c3a56af29b7.1777306795.git.chleroy@kernel.org>", "date": "2026-04-27T17:13:47", "name": "[RFC,v1,6/9] uaccess: Change copy_{to/from}_user to return -EFAULT", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e26541c7cdaf18e829fa9e8f2302b9591f5754d9", "submitter": { "id": 92089, "url": "http://patchwork.ozlabs.org/api/1.1/people/92089/?format=api", "name": "Christophe Leroy (CS GROUP)", "email": "chleroy@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/1a55107abe15dd78450888e2b5327c3a56af29b7.1777306795.git.chleroy@kernel.org/mbox/", "series": [ { "id": 501691, "url": "http://patchwork.ozlabs.org/api/1.1/series/501691/?format=api", "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/2229047/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2229047/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20181-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "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=YS9v5ort;\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=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1777310328;\n\tcv=none;\n b=gfd94ULmLUwhObIdotg7TFPY0UiSy0EQdRzpiPd8sn8kkEDsnv8hdofyUYtIZ8eYQrbrezGlrdAVmMknLk9uRq0zV8p6i7I+BmEL4kbR9mD7nsfVN34a7ItsCijLdONalb+4b9gd+Ed+QAvLDwV5x9j2n0Z0+XeCl1Iy1nyJ39nPZyO6iu4BbO0dYcNld73bBO6GtbrZ0DX3Q711IY/snTDuuRjMaSTpNk6EXcnw6Ar4HiFpuqZ8T/+/KfAFMRSCwt6CFqqI3+VwboWb6QoZdfgk9nLLoOQi6NQ9BkEcNS13sU4p1PRVQsydtxZADw6y9hz3zdh4MBiEMBcTe/EdGQ==", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707;\n\tt=1777310328; c=relaxed/relaxed;\n\tbh=gXNNHxOKJNxC6UbQGAQkWPTYQLhbBO1PUuIbA1i3jbc=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=mdX4TkjJkR9+FxON74kpKIaAOhDYxs/wmBihkfQBN9Qgwy/0Kh6d79OGUuzFP+a2C/N/2v6D1ObSSmo+0dr271w9vD5qeQAi859pq77dpNI7rGmQinUWBgQWh0+03PQVBntDCCTARt9eKPm5OTXmu6Vu3GYuAbAui+lUN0BZ8dQG8W0cmpBD9MksO9cWcRK5Lt+t3ADNAKisSrvXduCq2Ln/90S6NpYqK0yo/eiIAMLphhP+mLWt0HjStJcHjE8wIDuCwFA5lXXm7YTNevU7ydojuOIjSPPB0K+Dyx0Yyu5W56/Cn2RCNe/apUNf/R5YNU2K2cOzXyD3Wdc518SNlw==", "ARC-Authentication-Results": "i=1; lists.ozlabs.org;\n dmarc=pass (p=quarantine dis=none) header.from=kernel.org;\n dkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=YS9v5ort; dkim-atps=neutral;\n spf=pass (client-ip=172.234.252.31; helo=sea.source.kernel.org;\n envelope-from=chleroy@kernel.org;\n receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1777310325;\n\tbh=x+yz+Ptlr8yUKihbRCrYsj2OzN4+HDHdWj3mTkeeywo=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=YS9v5orti9jIm2coPKy7cH4iQCLjTYOH2T4kGrmAKw1lk2UpD8UcWDut4XHtMo5CX\n\t 290KHU3PNOVzMmnTKEL1o/OfzgOnzBVsJnbuGicRbc3HqjVsrjLo1DZ4Ncwz6tafWZ\n\t SG8/hG1Ct8pUgSHrDrW4chwaJ34uCldA2tlOQo4bI8M4kMxsW5bP0OLNOAC7BeTwPk\n\t Mil/pgBJA2/iCGWwmbEh5WNZZrQ4Md/gtqmnREocwFdhobkWjiqhIB30lRO/GV15k3\n\t DZOePxOSt4vdcYmGqKSVWX7R1FegGyxqEmqkjMUEcFWkKzHsBpXNo8/6bbP3EGANbq\n\t KZwGUUWEURiLg==", "From": "\"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>", "To": "Yury Norov <ynorov@nvidia.com>,\n\tAndrew Morton <akpm@linux-foundation.org>,\n\tLinus Torvalds <torvalds@linux-foundation.org>,\n\tDavid Laight <david.laight.linux@gmail.com>,\n\tThomas Gleixner <tglx@linutronix.de>", "Cc": "\"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\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 6/9] uaccess: Change copy_{to/from}_user to return\n -EFAULT", "Date": "Mon, 27 Apr 2026 19:13:47 +0200", "Message-ID": "\n <1a55107abe15dd78450888e2b5327c3a56af29b7.1777306795.git.chleroy@kernel.org>", "X-Mailer": "git-send-email 2.49.0", "In-Reply-To": "<cover.1777306795.git.chleroy@kernel.org>", "References": "<cover.1777306795.git.chleroy@kernel.org>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=2416; i=chleroy@kernel.org;\n h=from:subject:message-id; bh=x+yz+Ptlr8yUKihbRCrYsj2OzN4+HDHdWj3mTkeeywo=;\n b=owGbwMvMwCV2d0KB2p7V54MZT6slMWS+nxkjryH88LzkjscmK202zhcwuOPhcJTlidTVNdtCP\n 9vs/VPG2lHKwiDGxSArpshy/D/3rhldX1Lzp+7Sh5nDygQyhIGLUwAm0nCN4b9/yT75hpDtr4zk\n 9XPfORmtVO2p/XH+8bFg730PPNfMvn6dkWHDjsJSC09Vr9bDobdrxTgfMm1ckveKR+Rkud3skLM\n HLXgA", "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": "Now that copy_{to/from}_user_partial() are used by callers which expect\npartial copy with number of not copied bytes as return value, change\ncopy_{to/from}_user() to return an int, and return -EFAULT when the\ncopy is not complete.\n\nSigned-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>\n---\n include/linux/uaccess.h | 28 ++++++++++++++++++++++++----\n 1 file changed, 24 insertions(+), 4 deletions(-)", "diff": "diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h\nindex 2d37173782b3..33b7d0f5f808 100644\n--- a/include/linux/uaccess.h\n+++ b/include/linux/uaccess.h\n@@ -211,7 +211,7 @@ extern __must_check unsigned long\n _copy_to_user(void __user *, const void *, unsigned long);\n \n static __always_inline unsigned long __must_check\n-copy_from_user(void *to, const void __user *from, unsigned long n)\n+copy_from_user_common(void *to, const void __user *from, unsigned long n, bool partial)\n {\n \tif (!check_copy_size(to, n, false))\n \t\treturn n;\n@@ -221,10 +221,20 @@ copy_from_user(void *to, const void __user *from, unsigned long n)\n \t\treturn _inline_copy_from_user(to, from, n);\n }\n \n-#define copy_from_user_partial copy_from_user\n+static __always_inline unsigned long __must_check\n+copy_from_user_partial(void *to, const void __user *from, unsigned long n)\n+{\n+\treturn copy_from_user_common(to, from, n, true);\n+}\n+\n+static __always_inline int __must_check\n+copy_from_user(void *to, const void __user *from, unsigned long n)\n+{\n+\treturn copy_from_user_common(to, from, n, false) ? -EFAULT : 0;\n+}\n \n static __always_inline unsigned long __must_check\n-copy_to_user(void __user *to, const void *from, unsigned long n)\n+copy_to_user_common(void __user *to, const void *from, unsigned long n, bool partial)\n {\n \tif (!check_copy_size(from, n, true))\n \t\treturn n;\n@@ -235,7 +245,17 @@ copy_to_user(void __user *to, const void *from, unsigned long n)\n \t\treturn _inline_copy_to_user(to, from, n);\n }\n \n-#define copy_to_user_partial copy_to_user\n+static __always_inline unsigned long __must_check\n+copy_to_user_partial(void __user *to, const void *from, unsigned long n)\n+{\n+\treturn copy_to_user_common(to, from, n, true);\n+}\n+\n+static __always_inline int __must_check\n+copy_to_user(void __user *to, const void *from, unsigned long n)\n+{\n+\treturn copy_to_user_common(to, from, n, false) ? -EFAULT : 0;\n+}\n \n #ifndef copy_mc_to_kernel\n /*\n", "prefixes": [ "RFC", "v1", "6/9" ] }