From patchwork Tue Jan 23 00:27:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 13526689 Received: from mail-pl1-f176.google.com (mail-pl1-f176.google.com [209.85.214.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A92DC5BACD for ; Tue, 23 Jan 2024 00:35:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705970161; cv=none; b=ZA9PkbigJrKbWjNsKXuvIR5Qnz18vFS6qWisGYcBIds/Dnk187xSW/8DKZ1qRjRV0QipD9vyyvsMvOasSGxPSbC+oi/4qIXzs0ke4cNDY2MREwdpDkhWA9dZCkjf6g4uBUgV4pGLvtyQlB0yzM3edEeJ9p6lCzL3au4AbdkaXrU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705970161; c=relaxed/simple; bh=JaJ2RzkYot/4sV3jiZLTi+/y/zDvkmsfkl8XZ+sAZv8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=GFb1jhfOtv6s7oZ58fykE5Hp8zj4RiaJIkR4P1Xr8wwQeMvME/RknutvDI8YsCRgtRaUthxmWCthXgVh6RLTfHhcC5A+mirYafNFrhhY4/E2GYTjPk56wdBTff9MDlotC+vmzYwygHUgWJpYFa2tBiJTDUZ/hsPdiiA1F1ZywSM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=UvKOomai; arc=none smtp.client-ip=209.85.214.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="UvKOomai" Received: by mail-pl1-f176.google.com with SMTP id d9443c01a7336-1d750660a0aso6910865ad.0 for ; Mon, 22 Jan 2024 16:35:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1705970159; x=1706574959; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=iIWUdIrQWRkhOO5TDXuKcaUsLitTbGyLlklsAfWCzWo=; b=UvKOomaiN2VhtkDv5+8QNC+MtjXQx/iwGzTtFLEcj5s1VSKPBHwN2l2gwIDJh4mjBL zFvy+2Ct3bGei9Mw5MsNWsE/Djk5CfXLRWpyVexzj5Wml53eHNq93AIxm5GsGJ/wZx+w dVai29oFleneBo8Y+z3PkQ2GT9BFfJa0FDSaM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705970159; x=1706574959; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=iIWUdIrQWRkhOO5TDXuKcaUsLitTbGyLlklsAfWCzWo=; b=lT3tCydVE8Ne450ZBZ0JlZCU/EhW/kbT1kJjEZXSvNLWxdSFw8nEFOjUbm7vPqFNKt zPq5ZRA86GqYroJzWlxHj/8cFE252puGUqUW5ivPKN/FNNtVzsyimNB5vqNfO2HtSfTM TjstbD2BArWmxP8yGOttGO/quIwynH3VPyorV+wX/AgLIDCiVMXiLOk3QGxlppnVLBYj r0NBWWkemxdntGJPwyhYANomaZp1LDCmvN7eF8+Yl9icZEvQCL43IyttybS/452Xfmu8 2Dqn/QQ7O4bWKCGUyy/TsCQrD9Ak736IVU8EriSJQ5Vf2Qw3inuUpBSk/AbxOxxj0ks/ 7pug== X-Gm-Message-State: AOJu0YxE7JIk7waxQCf9DoTyv1Y3A6BGIZW9gq4y13gOdmJ8Yz3SgXOq ghiuEcSNql8vYppvulrPbCDj4a8mfiakzBJa6Tvb5KUgTpM4XuXZ34QV3iGiww== X-Google-Smtp-Source: AGHT+IGbD3nHFvLOHAqRpTgdheaQGatmkkSF5LsUW843Igdg/5hvIeA3Y0uoIVSr4tGmabJc+mdbbg== X-Received: by 2002:a17:902:e5c8:b0:1d7:3563:88ef with SMTP id u8-20020a170902e5c800b001d7356388efmr2199690plf.99.1705970159024; Mon, 22 Jan 2024 16:35:59 -0800 (PST) Received: from www.outflux.net ([198.0.35.241]) by smtp.gmail.com with ESMTPSA id e2-20020a170902744200b001d5f5887ae8sm7708987plt.10.2024.01.22.16.35.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Jan 2024 16:35:55 -0800 (PST) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , Sathya Prakash , Sreekanth Reddy , Suganath Prabu Subramani , "James E.J. Bottomley" , "Martin K. Petersen" , MPT-FusionLinux.pdl@broadcom.com, linux-scsi@vger.kernel.org, "Gustavo A. R. Silva" , Bill Wendling , Justin Stitt , linux-kernel@vger.kernel.org Subject: [PATCH 61/82] scsi: mpt3sas: Refactor intentional wrap-around test Date: Mon, 22 Jan 2024 16:27:36 -0800 Message-Id: <20240123002814.1396804-61-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240122235208.work.748-kees@kernel.org> References: <20240122235208.work.748-kees@kernel.org> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2218; i=keescook@chromium.org; h=from:subject; bh=JaJ2RzkYot/4sV3jiZLTi+/y/zDvkmsfkl8XZ+sAZv8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlrwgKR/y0c/t8XBxk6HBTKTo2onZffQ1Swuzxk YruIIw+tTCJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZa8ICgAKCRCJcvTf3G3A JsGHD/wO+1S4S3MYfwC+Xgo0UsnlP4RNEo76XTqku6Gtqo7+RgF/OJErJi+PSvELd675QOu9xdC EMr1YFfvIBEMrbHHvwJWkaErziO0Y3hRKhrFQr02QIrOnXeDwnIPzHDCv18K0d3Q+q041p/sRyj YB7tjSXSsTcFhvkEQ9dY+VylEL1PLD4Ozx1qB10yg6+pNkm/uCWrmiLvfSgSXIluY++aIRb26NL VaSRkVOonQ4P4lvoMg00EP5cCn0zHYNyG1e6Ea4+cIaFLUKcV46uB4xzGTwfw+vtbMdtn3jZaly hU/RxpkvU2oW1VIYwSeakNHq76noGBszsSTs6meNnd62v/yEdmDyqyTfqFKcm5jwd4LupJnffRl PaKJclzIEUwHDQGYtmTMzzYksMJ7+emnQ4pgS08Dr4frBXv3Kw20xwphAev7CU3j6ei4ghTajDd xxiU8Oq8sW9mW5SwmfrVaIgLmJe+Uwy7bC1EHgFeqFpqK/AbTNh+FplhncR9+E+Gonpq3iKfGC8 46fX7SBvoMASJQFlZP+ErSYOfIkvdt5fDwy3899f5cTVxe+NtVeUWwbBhp0I/BMoiXbh/N4Wz/m 1JLczsOR6Y1t0bzwiFfJd2zNYEyI8gvNaAak6MrluQfkHLAx0zAGsyXDQta1R52iYGD2+9KjtmB cB9P/HPcsvjdiPA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 In an effort to separate intentional arithmetic wrap-around from unexpected wrap-around, we need to refactor places that depend on this kind of math. One of the most common code patterns of this is: VAR + value < VAR Notably, this is considered "undefined behavior" for signed and pointer types, which the kernel works around by using the -fno-strict-overflow option in the build[1] (which used to just be -fwrapv). Regardless, we want to get the kernel source to the position where we can meaningfully instrument arithmetic wrap-around conditions and catch them when they are unexpected, regardless of whether they are signed[2], unsigned[3], or pointer[4] types. Refactor open-coded wrap-around addition test to use add_would_overflow(). This paves the way to enabling the wrap-around sanitizers in the future. Link: https://git.kernel.org/linus/68df3755e383e6fecf2354a67b08f92f18536594 [1] Link: https://github.com/KSPP/linux/issues/26 [2] Link: https://github.com/KSPP/linux/issues/27 [3] Link: https://github.com/KSPP/linux/issues/344 [4] Cc: Sathya Prakash Cc: Sreekanth Reddy Cc: Suganath Prabu Subramani Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: MPT-FusionLinux.pdl@broadcom.com Cc: linux-scsi@vger.kernel.org Signed-off-by: Kees Cook --- drivers/scsi/mpt3sas/mpt3sas_ctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c index 147cb7088d55..b36a9188720f 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c @@ -2382,7 +2382,7 @@ _ctl_diag_read_buffer(struct MPT3SAS_ADAPTER *ioc, void __user *arg) karg.bytes_to_read)); /* Truncate data on requests that are too large */ - if ((diag_data + karg.bytes_to_read < diag_data) || + if ((add_would_overflow(diag_data, karg.bytes_to_read)) || (diag_data + karg.bytes_to_read > request_data + request_size)) copy_size = request_size - karg.starting_offset; else