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 D397226CE21; Wed, 9 Jul 2025 07:07:03 +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=1752044823; cv=none; b=KRjxVmixIwe/MQU6THJ42wuLbydxWK6dhAY6QIV4KKmNKeu9N9oJpUiNDlpJ2Lr4cf28sNhVZHWZlmdWSIpuOjS6eQZnwdklCcCNADpxRzlOSzC2PKNXn+sjPfHCiZCiVu4JIRz074V5aRKbfBb5MCBC2oSpGtgb8uDdYimq9jg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752044823; c=relaxed/simple; bh=sCHgypb19BYRbxzEKSsZ4hThhQHTbSwF3jdVOMBf7as=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=qVxTDnh/kqkQLlT+9dfubyN6WfyrCSEQmqwF5fjCQPzIqFOTIlRPCSQ9EJt6iUgF6FAYIw3fo0Yw3ou2bbr+dWyuiURfOlXoC35T9vvrOU8ezEDVJgnOB8bM+LWkUCjLAIb0ZRIsFEz0Bj79gGvcF5GxqBsuq9bdH3n0VTfn8wc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RKHNmhDc; 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="RKHNmhDc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15590C4CEF0; Wed, 9 Jul 2025 07:07:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752044823; bh=sCHgypb19BYRbxzEKSsZ4hThhQHTbSwF3jdVOMBf7as=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=RKHNmhDcHIwTwLOcRAPLo5Bd83eOlrJOZuvmYsTwy9ngkYLUkK0+rgsEM2ProSD2E qzTeLVr1NpRdRSbgt00LO0r6CjELV1PwoqK2YRyIZySnnVb/0cSMJKNJOSnLmUrFtt /RwL27cxJeZBMcC5slEKdJwNdyU7IT62yfDfG3wRziyTBWc8FTrBMbq8+b01fT+FEb WQHuryG1QuocrP6tZTiNXoBVbycPZWJ2/WhVJV4UqE8KKok3CUTn3xN2XxhMw8HOJs 8WTswLReOGUYb1FLyuvwooEV2VczQDLZHcnU2s1x0d9XQDMpHneTWnK6TbuOewM0P9 ElOTfDkasoUWw== Message-ID: Date: Wed, 9 Jul 2025 09:07:00 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Bug] WARNING in vt_do_diacrit in Linux Kernel v6.14 To: Greg KH , Luka Cc: Jiri Slaby , linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org References: <2025070805-stoning-overeager-39f1@gregkh> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 08/07/2025 09:49, Greg KH wrote: > On Tue, Jul 08, 2025 at 03:21:36PM +0800, Luka wrote: >> Dear Linux Kernel Maintainers, >> >> I hope this message finds you well. >> >> I am writing to report a potential vulnerability I encountered during >> testing of the Linux Kernel version v6.14. >> >> Git Commit: 38fec10eb60d687e30c8c6b5420d86e8149f7557 (tag: v6.14) >> >> Bug Location: drivers/tty/vt/keyboard.c >> >> Bug report: https://pastebin.com/yuVJpati >> >> Complete log: https://pastebin.com/qKnipvvK >> >> Entire kernel config: https://pastebin.com/MRWGr3nv >> >> Root Cause Analysis: >> The vt_do_diacrit() function in the virtual terminal subsystem >> performs a write to a user-space pointer via __put_user_4() without >> ensuring that the destination address is mapped and accessible. > > Where? I see calls to put_user() happening in that function, and the > return value is properly checked. What lines exactly show the issue? Greg, Please don't waste time on this bot. It is AI generated spam. The person learnt nothing from previous feedback. I suggest ignoring completely. Best regards, Krzysztof