From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lamorak.hansenpartnership.com (lamorak.hansenpartnership.com [198.37.111.173]) (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 9036533086; Wed, 30 Apr 2025 12:59:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.37.111.173 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746017981; cv=none; b=stWpVSTP+xuVKjkF1g3wNv/PYck07g6G2ilXKFTDv9FMlX61nwAjTVsZ3o+7av2GQuN/OzGmJquYyGBmVGh7DhHZyjv42p52st36cjeSdch2YZEzxUjS9/OufYx+lnvzTstUwaL4npBtNauEATHbZLYDihzWm5vrUpFvB52qy2k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746017981; c=relaxed/simple; bh=aXBH/J/hU7WZyfYfrPn6BPRa4jDLEh+bhSWJG2MyPUQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=OfSzKUQxqbclmuFA5x4UGjP/5Vj3J8O69YWDcEtQ7GgW2xbvWwR+w7ER51WLS2KlhA9phbex3nPNhIrAnPT/MadxZgR03JpU1lQtTar0GiOfmkqBTiOeiRVh/d9gbGuxmUmtaysrZZHl5NoPMcmzZs28FOOA6w549RfLpWbE5NU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com; spf=pass smtp.mailfrom=HansenPartnership.com; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b=KhIPkN3a; arc=none smtp.client-ip=198.37.111.173 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=HansenPartnership.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=hansenpartnership.com header.i=@hansenpartnership.com header.b="KhIPkN3a" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hansenpartnership.com; s=20151216; t=1746017977; bh=aXBH/J/hU7WZyfYfrPn6BPRa4jDLEh+bhSWJG2MyPUQ=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References:From; b=KhIPkN3af86l1kJ+yBjba+lKJtIQoWBM5dMAKhy45NxOHxJVajyjP7PF7u2pH6jUH qnCVop5XovbJ4rvF42Ynl8Z8MluT6QFA/cQL0pXbPmdOCv4MxdPq1HU1YHGEv+IiuT Qnl7yhSkjXR7AFVFBB8uXF2FN0pyxJWI91lOQ/kg= Received: from lingrow.int.hansenpartnership.com (unknown [IPv6:2601:5c4:4302:c21::a774]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lamorak.hansenpartnership.com (Postfix) with ESMTPSA id 19FF51C0403; Wed, 30 Apr 2025 08:59:37 -0400 (EDT) Message-ID: <9028680b0d2b7c42d0e990bbdcd247d824e01153.camel@HansenPartnership.com> Subject: Re: [PATCH] scsi: NCR5380: Prevent potential out-of-bounds read in spi_print_msg() From: James Bottomley To: Rand Deeb , Finn Thain , Michael Schmitz , "Martin K. Petersen" , "open list:NCR 5380 SCSI DRIVERS" , open list Cc: deeb.rand@confident.ru, lvc-project@linuxtesting.org, voskresenski.stanislav@confident.ru Date: Wed, 30 Apr 2025 08:59:36 -0400 In-Reply-To: <20250430115926.6335-1-rand.sec96@gmail.com> References: <20250430115926.6335-1-rand.sec96@gmail.com> Autocrypt: addr=James.Bottomley@HansenPartnership.com; prefer-encrypt=mutual; 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 8mT2Eh9SkH+YVOmaKsajgZgrBxA7fWmGoxXswEVxJIFj3vW7yNc0C5HaUdYa5iGOMs4kg2ht4s7yy7NRQuh7BifWjo6BQ6k4S1H+6axZucxhSV1L6zN9d+lr3Xo/vy1unzA== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Wed, 2025-04-30 at 14:59 +0300, Rand Deeb wrote: > spi_print_msg() assumes that the input buffer is large enough to > contain the full SCSI message, including extended messages which may > access msg[2], msg[3], msg[7], and beyond based on message type. That's true because it's a generic function designed to work for all parallel card. However, this card only a narrow non-HVD low frequency one, so it only really speaks a tiny subset of this (in particular it would never speak messages over 3 bytes). > NCR5380_reselect() currently allocates a 3-byte buffer for 'msg' > and reads only a single byte from the SCSI bus before passing it to > spi_print_msg(), which can result in a potential out-of-bounds read > if the message is malformed or declares a longer length. The reselect protocol *requires* the next message to be an identify.=20 Since these cards and the devices they attack to are all decades old, I think if they were going to behave like this we'd have seen it by now. The bottom line is we don't add this type of thing to a device facing interface unless there's evidence of an actual negotiation problem. [...]=C2=A0 > @@ -2084,7 +2084,7 @@ static void NCR5380_reselect(struct Scsi_Host > *instance) > =C2=A0 msg[0] =3D NCR5380_read(CURRENT_SCSI_DATA_REG); > =C2=A0#else > =C2=A0 { > - int len =3D 1; > + int len =3D sizeof(msg); You didn't test this, did you? The above code instructs the card to wait for 16 bytes on reselection and abort if they aren't found ... i.e. every reselection now aborts because the device is only sending a one byte message. Regards, James