From patchwork Wed Feb 16 13:13:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 12748540 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AA1AC433F5 for ; Wed, 16 Feb 2022 13:16:56 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CEDAE6B0082; Wed, 16 Feb 2022 08:16:55 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id C762E6B0083; Wed, 16 Feb 2022 08:16:55 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id AF1EA6B0085; Wed, 16 Feb 2022 08:16:55 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0131.hostedemail.com [216.40.44.131]) by kanga.kvack.org (Postfix) with ESMTP id A03796B0082 for ; Wed, 16 Feb 2022 08:16:55 -0500 (EST) Received: from smtpin29.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 6506C181AC9C6 for ; Wed, 16 Feb 2022 13:16:55 +0000 (UTC) X-FDA: 79148693190.29.045A2C3 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf26.hostedemail.com (Postfix) with ESMTP id ECA17140014 for ; Wed, 16 Feb 2022 13:16:54 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 5C7486164A; Wed, 16 Feb 2022 13:16:54 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47582C340F1; Wed, 16 Feb 2022 13:16:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1645017413; bh=+iR2qnnFcrsCPQoMglxV/90U3LFjDlY0u/606L67UPs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FvFA19KgOFHw//5AD53hF0IwW2eLEb8iC830WFN6MdVoW4fyh5i/2kJHpxFd7pdlD 7UX6fEewGCq+cZvaT2PObS6XOZnZypDPzvRcYa/W0nzWewDgb+0xXamh2omZfLYFmr 8N4H7mpvMOTDqe2QPH8s/NhnVxUv6/h988kxIKpvMvfqvjGNNvINW6t4henTJIKwJt jzLnL5Fc+Su69zkh5g1Nf3EInYTi+sp1khBbBbK8Lt97/7IVApa2FzdwQAvU7AyEeL nEYQi1fYgk8k2uZixKdw/j3+QwXzCx+3pjcEKGsjL9tNOzijYs/MTwOK3SPeQjakHj 3w2JGHUIm9rGg== From: Arnd Bergmann To: Linus Torvalds , Christoph Hellwig , linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, arnd@arndb.de, linux-kernel@vger.kernel.org, viro@zeniv.linux.org.uk Cc: linux@armlinux.org.uk, will@kernel.org, guoren@kernel.org, bcain@codeaurora.org, geert@linux-m68k.org, monstr@monstr.eu, tsbogend@alpha.franken.de, nickhu@andestech.com, green.hu@gmail.com, dinguyen@kernel.org, shorne@gmail.com, deller@gmx.de, mpe@ellerman.id.au, peterz@infradead.org, mingo@redhat.com, mark.rutland@arm.com, hca@linux.ibm.com, dalias@libc.org, davem@davemloft.net, richard@nod.at, x86@kernel.org, jcmvbkbc@gmail.com, ebiederm@xmission.com, akpm@linux-foundation.org, ardb@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org Subject: [PATCH v2 07/18] nios2: drop access_ok() check from __put_user() Date: Wed, 16 Feb 2022 14:13:21 +0100 Message-Id: <20220216131332.1489939-8-arnd@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20220216131332.1489939-1-arnd@kernel.org> References: <20220216131332.1489939-1-arnd@kernel.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: ECA17140014 X-Rspam-User: Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=FvFA19Kg; spf=pass (imf26.hostedemail.com: domain of arnd@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=arnd@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Stat-Signature: 6zw3nkk7m9nbygu5cyi1fuf5jagsjucs X-Rspamd-Server: rspam11 X-HE-Tag: 1645017414-338756 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: From: Arnd Bergmann Unlike other architectures, the nios2 version of __put_user() has an extra check for access_ok(), preventing it from being used to implement __put_kernel_nofault(). Split up put_user() along the same lines as __get_user()/get_user() Signed-off-by: Arnd Bergmann Reviewed-by: Christoph Hellwig Acked-by: Dinh Nguyen --- arch/nios2/include/asm/uaccess.h | 56 +++++++++++++++++++------------- 1 file changed, 33 insertions(+), 23 deletions(-) diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h index ca9285a915ef..a5cbe07cf0da 100644 --- a/arch/nios2/include/asm/uaccess.h +++ b/arch/nios2/include/asm/uaccess.h @@ -167,34 +167,44 @@ do { \ : "r" (val), "r" (ptr), "i" (-EFAULT)); \ } -#define put_user(x, ptr) \ +#define __put_user_common(__pu_val, __pu_ptr) \ ({ \ long __pu_err = -EFAULT; \ - __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ - __typeof__(*(ptr)) __pu_val = (__typeof(*ptr))(x); \ - if (access_ok(__pu_ptr, sizeof(*__pu_ptr))) { \ - switch (sizeof(*__pu_ptr)) { \ - case 1: \ - __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \ - break; \ - case 2: \ - __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \ - break; \ - case 4: \ - __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \ - break; \ - default: \ - /* XXX: This looks wrong... */ \ - __pu_err = 0; \ - if (copy_to_user(__pu_ptr, &(__pu_val), \ - sizeof(*__pu_ptr))) \ - __pu_err = -EFAULT; \ - break; \ - } \ + switch (sizeof(*__pu_ptr)) { \ + case 1: \ + __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \ + break; \ + case 2: \ + __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \ + break; \ + case 4: \ + __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \ + break; \ + default: \ + /* XXX: This looks wrong... */ \ + __pu_err = 0; \ + if (__copy_to_user(__pu_ptr, &(__pu_val), \ + sizeof(*__pu_ptr))) \ + __pu_err = -EFAULT; \ + break; \ } \ __pu_err; \ }) -#define __put_user(x, ptr) put_user(x, ptr) +#define __put_user(x, ptr) \ +({ \ + __auto_type __pu_ptr = (ptr); \ + typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ + __put_user_common(__pu_val, __pu_ptr); \ +}) + +#define put_user(x, ptr) \ +({ \ + __auto_type __pu_ptr = (ptr); \ + typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ + access_ok(__pu_ptr, sizeof(*__pu_ptr)) ? \ + __put_user_common(__pu_val, __pu_ptr) : \ + -EFAULT; \ +}) #endif /* _ASM_NIOS2_UACCESS_H */