From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6A723C7EE25 for ; Thu, 4 May 2023 19:56:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231880AbjEDTyq (ORCPT ); Thu, 4 May 2023 15:54:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59414 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231773AbjEDTxq (ORCPT ); Thu, 4 May 2023 15:53:46 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4063093CF; Thu, 4 May 2023 12:47:47 -0700 (PDT) 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 4CDCC637BC; Thu, 4 May 2023 19:47:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57064C4339B; Thu, 4 May 2023 19:47:41 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1683229662; bh=cC4elgfiylqXr8hIERqShOfpHyjdVbTDkCkdTG2+fmY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LsKjQmPcU87cBMHh5abmhiyoga8h40iHpVsUpVyFVT5nJ+xVtjUe+Qo7zzIInxXGV ksFYsHqZwS5Qx5rv/1qCSERb1IBx7K1QVPamv4nVG/NclNQ4LKzka1DkOXmuA8zWhH isVteQHcboCCsqQSPnueGZfmhR+/i9p3ad43MGKsWA4HF7bFRfemUQXsnZFToLlH97 NDAUD1A/SCgFRwOEn4CfEr5O8XBavmfuFuzfy0sOV5y5Xlb7TdIoANJh8V3SzZTO+m 2WNTv8rGEAoVD5rvJzHVo7wfn+Wq5ghwiSp7BihEY6Unlu4g4WNoehShNEfmje5yYo Pwd7Vdv8LTLXQ== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Hyunwoo Kim , Gregory Greenman , Johannes Berg , Sasha Levin , kvalo@kernel.org, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, avraham.stern@intel.com, emmanuel.grumbach@intel.com, linux-wireless@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 30/49] wifi: iwlwifi: pcie: Fix integer overflow in iwl_write_to_user_buf Date: Thu, 4 May 2023 15:46:07 -0400 Message-Id: <20230504194626.3807438-30-sashal@kernel.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230504194626.3807438-1-sashal@kernel.org> References: <20230504194626.3807438-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hyunwoo Kim [ Upstream commit 58d1b717879bfeabe09b35e41ad667c79933eb2e ] An integer overflow occurs in the iwl_write_to_user_buf() function, which is called by the iwl_dbgfs_monitor_data_read() function. static bool iwl_write_to_user_buf(char __user *user_buf, ssize_t count, void *buf, ssize_t *size, ssize_t *bytes_copied) { int buf_size_left = count - *bytes_copied; buf_size_left = buf_size_left - (buf_size_left % sizeof(u32)); if (*size > buf_size_left) *size = buf_size_left; If the user passes a SIZE_MAX value to the "ssize_t count" parameter, the ssize_t count parameter is assigned to "int buf_size_left". Then compare "*size" with "buf_size_left" . Here, "buf_size_left" is a negative number, so "*size" is assigned "buf_size_left" and goes into the third argument of the copy_to_user function, causing a heap overflow. This is not a security vulnerability because iwl_dbgfs_monitor_data_read() is a debugfs operation with 0400 privileges. Signed-off-by: Hyunwoo Kim Signed-off-by: Gregory Greenman Link: https://lore.kernel.org/r/20230414130637.2d80ace81532.Iecfba549e0e0be21bbb0324675392e42e75bd5ad@changeid Signed-off-by: Johannes Berg Signed-off-by: Sasha Levin --- drivers/net/wireless/intel/iwlwifi/pcie/trans.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c index bd50f52a1aade..def5b804c7ffc 100644 --- a/drivers/net/wireless/intel/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/intel/iwlwifi/pcie/trans.c @@ -2854,7 +2854,7 @@ static bool iwl_write_to_user_buf(char __user *user_buf, ssize_t count, void *buf, ssize_t *size, ssize_t *bytes_copied) { - int buf_size_left = count - *bytes_copied; + ssize_t buf_size_left = count - *bytes_copied; buf_size_left = buf_size_left - (buf_size_left % sizeof(u32)); if (*size > buf_size_left) -- 2.39.2