From patchwork Wed Jul 6 22:25:25 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 9217181 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 60AF960467 for ; Wed, 6 Jul 2016 22:28:58 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4E87C284DF for ; Wed, 6 Jul 2016 22:28:58 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 42B4C284E5; Wed, 6 Jul 2016 22:28:58 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.1 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED, T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id F32C7284DF for ; Wed, 6 Jul 2016 22:28:57 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.85_2 #1 (Red Hat Linux)) id 1bKvI1-00048y-Hb; Wed, 06 Jul 2016 22:27:29 +0000 Received: from mail-pf0-x22b.google.com ([2607:f8b0:400e:c00::22b]) by bombadil.infradead.org with esmtps (Exim 4.85_2 #1 (Red Hat Linux)) id 1bKvGh-0002ii-BU for linux-arm-kernel@lists.infradead.org; Wed, 06 Jul 2016 22:26:09 +0000 Received: by mail-pf0-x22b.google.com with SMTP id h14so132385pfe.1 for ; Wed, 06 Jul 2016 15:25:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=53PYqgNylLZeKM9L3G6xJD9dTm0uUlV4wGtOsfwVhls=; b=oOVoXDFU8S1ddEvfg0iZNSWC5jRN71J2/LtVHq/+JfjFvI7G3oGoBLIQ1+VNfhJArN FpQza/PY7DW/uN7Z/FFIwxVtm3gScl/S7Qwjxs9EK13yToUsP0TexjgID3gm2n9qqTlt u1gMUHUf8TkDwCeGB4/mku6PFRakhM77DNSdw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=53PYqgNylLZeKM9L3G6xJD9dTm0uUlV4wGtOsfwVhls=; b=RWlG+nPaU4LjAReRUmKUxituNdiKzyNZMuHZvzDycaLO25Vj73ZTzY8BFyKQBYZkl3 USRvsePkB0K4+RYNj99Q40v5TVwX64+ogcdxyrbffiKRMmE23AuC4vVfIF1S9QrrfUHa CSWwqb0xSiFATSUJQgh0rYfZEbP4PTcR9IMGx6aLcmCV+mDbM13SpFeXb993hugQtx1T 0cYDaPsIFRCczaxRD4mNFH/0GkIqZ+wcCnX+FmkF1bkRBq1Alct2+kAYnPaYxzrqSNI4 XQCe4WpXJs1k+MWz918o8DAtKfb9IqaBVuobfg9Jiumle0r2bXed94LDPq/OXNkuemJi Jwkw== X-Gm-Message-State: ALyK8tLB64VWlppf7KEe+3dO7W5jn6hqVQv/mexP1teH0SxgJNubKhaXY4kGdSK7nV3n/J3j X-Received: by 10.98.70.144 with SMTP id o16mr46647441pfi.126.1467843946333; Wed, 06 Jul 2016 15:25:46 -0700 (PDT) Received: from www.outflux.net ([2002:ada4:7085:0:ae16:2dff:fe07:4fb6]) by smtp.gmail.com with ESMTPSA id t4sm125535paf.39.2016.07.06.15.25.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 06 Jul 2016 15:25:45 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Subject: [PATCH 6/9] powerpc/uaccess: Enable hardened usercopy Date: Wed, 6 Jul 2016 15:25:25 -0700 Message-Id: <1467843928-29351-7-git-send-email-keescook@chromium.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1467843928-29351-1-git-send-email-keescook@chromium.org> References: <1467843928-29351-1-git-send-email-keescook@chromium.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160706_152607_484589_E1DB39E2 X-CRM114-Status: GOOD ( 13.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Jan Kara , kernel-hardening@lists.openwall.com, Catalin Marinas , Will Deacon , linux-mm@kvack.org, sparclinux@vger.kernel.org, linux-ia64@vger.kernel.org, Christoph Lameter , Andrea Arcangeli , linux-arch@vger.kernel.org, Michael Ellerman , x86@kernel.org, Russell King , linux-arm-kernel@lists.infradead.org, Benjamin Herrenschmidt , PaX Team , Borislav Petkov , Mathias Krause , Fenghua Yu , Rik van Riel , Kees Cook , Vitaly Wool , David Rientjes , Tony Luck , Andy Lutomirski , Joonsoo Kim , Dmitry Vyukov , Laura Abbott , Brad Spengler , Ard Biesheuvel , Pekka Enberg , Casey Schaufler , Andrew Morton , linuxppc-dev@lists.ozlabs.org, "David S. Miller" MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Enables CONFIG_HARDENED_USERCOPY checks on powerpc. Based on code from PaX and grsecurity. Signed-off-by: Kees Cook --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/uaccess.h | 21 +++++++++++++++++++-- 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 01f7464d9fea..b7a18b2604be 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -164,6 +164,7 @@ config PPC select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS + select HAVE_ARCH_HARDENED_USERCOPY config GENERIC_CSUM def_bool CPU_LITTLE_ENDIAN diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h index b7c20f0b8fbe..c1dc6c14deb8 100644 --- a/arch/powerpc/include/asm/uaccess.h +++ b/arch/powerpc/include/asm/uaccess.h @@ -310,10 +310,15 @@ static inline unsigned long copy_from_user(void *to, { unsigned long over; - if (access_ok(VERIFY_READ, from, n)) + if (access_ok(VERIFY_READ, from, n)) { + if (!__builtin_constant_p(n)) + check_object_size(to, n, false); return __copy_tofrom_user((__force void __user *)to, from, n); + } if ((unsigned long)from < TASK_SIZE) { over = (unsigned long)from + n - TASK_SIZE; + if (!__builtin_constant_p(n - over)) + check_object_size(to, n - over, false); return __copy_tofrom_user((__force void __user *)to, from, n - over) + over; } @@ -325,10 +330,15 @@ static inline unsigned long copy_to_user(void __user *to, { unsigned long over; - if (access_ok(VERIFY_WRITE, to, n)) + if (access_ok(VERIFY_WRITE, to, n)) { + if (!__builtin_constant_p(n)) + check_object_size(from, n, true); return __copy_tofrom_user(to, (__force void __user *)from, n); + } if ((unsigned long)to < TASK_SIZE) { over = (unsigned long)to + n - TASK_SIZE; + if (!__builtin_constant_p(n)) + check_object_size(from, n - over, true); return __copy_tofrom_user(to, (__force void __user *)from, n - over) + over; } @@ -372,6 +382,10 @@ static inline unsigned long __copy_from_user_inatomic(void *to, if (ret == 0) return 0; } + + if (!__builtin_constant_p(n)) + check_object_size(to, n, false); + return __copy_tofrom_user((__force void __user *)to, from, n); } @@ -398,6 +412,9 @@ static inline unsigned long __copy_to_user_inatomic(void __user *to, if (ret == 0) return 0; } + if (!__builtin_constant_p(n)) + check_object_size(from, n, true); + return __copy_tofrom_user(to, (__force const void __user *)from, n); }