From patchwork Tue Jun 14 17:33:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: V4bel X-Patchwork-Id: 581942 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 DA9BFC433EF for ; Tue, 14 Jun 2022 17:33:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237974AbiFNRd6 (ORCPT ); Tue, 14 Jun 2022 13:33:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54350 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237389AbiFNRd5 (ORCPT ); Tue, 14 Jun 2022 13:33:57 -0400 Received: from mail-pj1-x1030.google.com (mail-pj1-x1030.google.com [IPv6:2607:f8b0:4864:20::1030]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C7481237C9 for ; Tue, 14 Jun 2022 10:33:56 -0700 (PDT) Received: by mail-pj1-x1030.google.com with SMTP id q12-20020a17090a304c00b001e2d4fb0eb4so12420386pjl.4 for ; Tue, 14 Jun 2022 10:33:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=date:from:to:subject:message-id:mime-version:content-disposition; bh=Fx7y7b5NG3L1DrwnfoPrqy653Ut41bmGlxWqY9ODEI0=; b=jjiX2M85C4oZsHl2iw7FA+cFr3O+d5SgLOVedx3nFZlnuimQspuG52J1OwJYMorzEC t4RziT41LNr+z4f8pI1XdHNHb6KwOquaBLh3QreB6q8mCc1IZanW7n6ljSsVBg0nKZMC cp9i3wkff/bIjmETrG3c0E3XP7iMGB5mGhe9JVoNoH/Gp1GzBVhSTjqCEnFqIuvRlcp2 fsQknH032SJ4FgRMJ07/NfHP0TKSLzpayhGy8p3l4BcL+XeGF4QNjMFqgUi2MD2Lcwdk q4YGJKLK+Y4JcddWTSNjzF7VYasp+JUqqiwJ/TyLd4+eZRSx+Drw8Av2NuUw7S0tpdMo CFrg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:subject:message-id:mime-version :content-disposition; bh=Fx7y7b5NG3L1DrwnfoPrqy653Ut41bmGlxWqY9ODEI0=; b=xL+aXtq6BxtUDjG9TBxAaxwQlqA4JizjwZS+AfGqOpmM8gkZomR9wu8wIA0dPBtTRr AxhcX7HVI3mPNL47lNyc8aLauoaQ+pPs1b2uZgqlZZQeDvkEG/nTZm/YyqNm4q4ag63N khBb3GE1Ne8HMi6rV5PrvKxu02VlWbkOOOF+bQjjQU1Lxsd6jT18M59XwMuUYf+dHJsV 4dFTKkWrZvTK6QpyWS1SuHi3dyY4FJEH+Uak/CeOO0tb+ePzyvb1ZqgDaTWwTj8JAIJG 3k+M0w+Xo0ZzlWy6zGMARztmQdj4mMLwBy4PAF3492pE4tvNMU4C7AjT789ClBT4xUMV EojQ== X-Gm-Message-State: AJIora/96cVbsLR0mrSlQPg7nL3NmjH/9EVN1FVs/i1PGAVlvVQlduBD yOp3lwfaosNmm3YNivCm+YZoln5SOAKukw== X-Google-Smtp-Source: AGRyM1tkjbUAPUK8zTu8hTfFKRpYF2IsR5ekTx9DtS+Ew8+251fcdK6L9yHBG2vhVAPyRKpbwUyhVw== X-Received: by 2002:a17:90b:240e:b0:1e0:775b:f8fc with SMTP id nr14-20020a17090b240e00b001e0775bf8fcmr5712731pjb.132.1655228036244; Tue, 14 Jun 2022 10:33:56 -0700 (PDT) Received: from ubuntu ([175.124.254.119]) by smtp.gmail.com with ESMTPSA id ja21-20020a170902efd500b0016632179ecfsm7468049plb.264.2022.06.14.10.33.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jun 2022 10:33:55 -0700 (PDT) Date: Tue, 14 Jun 2022 10:33:52 -0700 From: Hyunwoo Kim To: gregory.greenman@intel.com, linux-wireless@vger.kernel.org Subject: [PATCH] iwlwifi: pcie: Fixed integer overflow in iwl_write_to_user_buf Message-ID: <20220614173352.GA588327@ubuntu> MIME-Version: 1.0 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org 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 --- 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 bd50f52a1aad..fded5d305b11 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)