From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1C5A5396B9A; Mon, 20 Jul 2026 06:08:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784527740; cv=none; b=jAUH5JwLXvLQ1sdUMctZz1gOGAVpcKEKRkgwAFcSVygxu8rDs+wBTd2oZanMLiTJa+XzrN1x/GSSDTbWswGlvRPHKeYguJRjtV1PvqP25oRw7reiR2vK8bu2qfInHuyl3I+mwaJXjDoHYHuqFtId8yMk65deP6Ky9vGEYfRFb28= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784527740; c=relaxed/simple; bh=4JPdDSZPLoNcjwbTXCJzkIN+Z3+z0tCrOV2TrQcHiw8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=vBcWdwTKquBvdEdXTrm1Q/yrFGXqiMcqCbT/DXTLtNm44h6I/WhLMdwboW4QguQ1FAQf/3xB8A+WjEHsHxShRIAmPhHSLIaehTJ7HmrglBFmrrhKXqLjG3XZ2VJwmsmcs3kriK1r3xMpn1m2SgHOUAb0LW08iyO9kvhYmyTaFdw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H24bv4XQ; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="H24bv4XQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E37641F000E9; Mon, 20 Jul 2026 06:08:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784527732; bh=hkHEouwlt6hTQycxY0xmps0aXJ7t4g0QoU7CcIZyP0A=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=H24bv4XQlfV4zDZkBw/7RFPhsl3KklE1tAg43IUq7o24exyMNm0A8lr07djG2uu85 lHNbzVXAcb8PVNDpLyRDalMLAHhNnEq2zZbaN9+HjeAL36zfWa4mOC1VRq1REsPI6F iWIO8cxHdNPSamZaXnB/uNgmt76CzSHUX4ikXqYNaolgKN+VcU1O0LQDWjmdEhZ5SQ eyrNY39koWSCANnRvSen5CUVFtWW6hzyQbHjJykotK/5ybfHNPn5E82NC6Lcs8OV+y 2grAVGennoA05G8OcqZtgA8sWiYhzCd1fpTeCQNZQHyW8obZzn1/vODbpVEAQp1Bhl yai/hZj7nI5FQ== Message-ID: <0d58c9fe-7aed-43dd-8d00-6edfee9e2876@kernel.org> Date: Mon, 20 Jul 2026 08:08:48 +0200 Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] serial: 8250: validate iomem_base in serial8250_verify_port() To: Mingyu Wang <25181214217@stu.xidian.edu.cn>, gregkh@linuxfoundation.org Cc: ilpo.jarvinen@linux.intel.com, john.ogness@linutronix.de, andriy.shevchenko@linux.intel.com, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller@googlegroups.com, stable@vger.kernel.org References: <20260720053733.102186-1-25181214217@stu.xidian.edu.cn> Content-Language: en-US From: Jiri Slaby Autocrypt: addr=jirislaby@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 20. 07. 26, 7:37, Mingyu Wang wrote: > Fix this by tightening the validation in serial8250_verify_port(). > Reject any TIOCSSERIAL requests that attempt to modify the io_type > to/from memory-mapped types, or change the iomem_base of an existing > memory-mapped port. Userspace can still legitimately modify IRQs or > baud rates of MMIO ports as long as the io_type and mapbase remain > unchanged. Pardon my ignorance, but isn't TIOCSSERIAL intended exactly to change the type or mapbase when needed for ports without UPF_FIXED_PORT (and under root)? thanks, -- js suse labs