From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 033E91DFE24 for ; Thu, 7 Nov 2024 12:39:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730983190; cv=none; b=LeSVAT8ddutY/S8gPYsCEykKx1RkGS5EvtwBU+cq1eqooQGTPq2PPJSK01+yWp4AeKM3okGybrC2VzxHzkqiG8Wqf0nSFkwGA7TM6NlbYQTIY4gGwU/VWkZT/t+JlpMq8EAIuplSLMpQrdH7V1LWp36FWRSPzPxSHatv/rYS4bE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730983190; c=relaxed/simple; bh=InwXhefvIMMf6KuhGT4MwWq1sXnSOw4sJLFqi3Wj7pQ=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=YH2fLO1SBG/j2ToPle23VzNPJETLQpsVbDfnirXtw97J+SkRWWjnHWoM3Xh16muOBj3OVXnBdj7GVTDsIihGiSqBPPu6KC4wr9eDJEwQvgl7R1M51WSoFziR3oFq8jEDpKS2oTwp760Y3mcr9ac/O0cee12q7K3TSPe62BCfZ/M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=DOOAqTNP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="DOOAqTNP" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9398CC4CECC for ; Thu, 7 Nov 2024 12:39:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1730983189; bh=InwXhefvIMMf6KuhGT4MwWq1sXnSOw4sJLFqi3Wj7pQ=; h=From:To:Subject:Date:From; b=DOOAqTNPRUwfYOoTbl7vFK5D8l8dhF4ZVfbSMRkSBhAHi65L4snH6F5fDNnlVecWq 8N5ICuNd9gYm1KuEvoTYdm9OT9xmo0FIYCC/gg0/ljmnZsx51XgP5D2A8L12YfPUgk Q6trDHXiwYZieSApwqc3uZvOXc4SYEmqXyWVFZafdBwpVpD1ZPZFIO+fyVHLfh+v5u OCxGtMHKqmyFNeeuWQY5TBe1xTeEMZUwM6r9KUdjo9vt10Fz4ugqHgOm3ip8wuuETC T2Ts6m+DiKKgLCUCQ4YHmioa86jwy0/BcYdZy10HvznuASSqPhJduQyeRUsVYclRX0 uoJI5H81MOvyA== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 7D63EC53BC2; Thu, 7 Nov 2024 12:39:49 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-bluetooth@vger.kernel.org Subject: [Bug 219481] New: Buffer overflow vulnerability in btusb_write() Date: Thu, 07 Nov 2024 12:39:49 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Drivers X-Bugzilla-Component: Bluetooth X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: sushilkumardeveloper@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: linux-bluetooth@vger.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D219481 Bug ID: 219481 Summary: Buffer overflow vulnerability in btusb_write() Product: Drivers Version: 2.5 Hardware: All OS: Linux Status: NEW Severity: normal Priority: P3 Component: Bluetooth Assignee: linux-bluetooth@vger.kernel.org Reporter: sushilkumardeveloper@gmail.com Regression: No Created attachment 307171 --> https://bugzilla.kernel.org/attachment.cgi?id=3D307171&action=3Dedit Bug: A buffer overflow vulnerability in the Bluetooth subsystem. Location: drivers/bluetooth/btusb.c This is Code with bug Bug Report: Buffer Overflow Vulnerability in `btusb_write` Function >>=20=20=20=20=20=20 Summary: A buffer overflow vulnerability has been identified in the `btusb_write` function within the Bluetooth subsystem of the Linux kernel (`drivers/bluetooth/btusb.c`). The function does not properly validate the = size of the data being written, which may lead to a potential buffer overflow. >> Location: - File: `drivers/bluetooth/btusb.c` - Function: `btusb_write` >> Description: The current implementation of the `btusb_write` function performs a check to ensure that the `count` (number of bytes to write) does not exceed 64 bytes. However, it does not perform any additional validation to ensure that the `count` value is a positive integer. This can lead to unexpected behavior, including potential buffer overflow, if the `count` is zero or negative. >> Issue: - The check `if (count > 64)` ensures that the count does not exceed 64 byt= es, but it does not validate that `count` is a positive number. - If `count` is zero or negative, the behavior is undefined, potentially leading to a buffer overflow, memory corruption, or other unexpected behavi= or. >> Proposed Fix: Add an additional check to ensure that `count` is greater than zero before proceeding with the write operation. This will prevent the possibility of passing an invalid `count` value (i.e., zero or negative). >> Explanation: - The additional condition `if (count <=3D 0)` ensures that the write opera= tion will not proceed if the `count` is zero or negative, which could have resul= ted in an invalid memory access or other undefined behavior. - This fix improves the robustness of the function by properly validating t= he `count` value before using it in the `btusb_submit_cmd` function. >> Impact: This bug could potentially lead to security vulnerabilities or crashes if negative or zero values are passed to the `btusb_write` function. The propo= sed fix mitigates the risk of buffer overflows by ensuring that only valid sizes are used for data writing operations. >> Steps to Reproduce: 1. Clone the Linux kernel source code (`git clone https://github.com/torvalds/linux.git`). 2. Locate the function `btusb_write` in `drivers/bluetooth/btusb.c`. 3. Provide an invalid value (e.g., zero or negative) for `count` when calli= ng the function. 4. Observe that the function may fail to handle the invalid size appropriat= ely, potentially causing undefined behavior. >> Patch Available:=20=20 Yes. A patch has been proposed in the "Corrected Code" section above. >> Additional Notes: This issue was identified using static analysis tools, but it may not have = been readily apparent during regular testing or use. It's recommended that this = bug be fixed to ensure the stability and security of the Bluetooth subsystem. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.=