From mboxrd@z Thu Jan 1 00:00:00 1970 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 193BEC433F5 for ; Mon, 13 Dec 2021 21:37:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S243136AbhLMVhd (ORCPT ); Mon, 13 Dec 2021 16:37:33 -0500 Received: from esa2.hgst.iphmx.com ([68.232.143.124]:41262 "EHLO esa2.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242808AbhLMVhc (ORCPT ); Mon, 13 Dec 2021 16:37:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1639431452; x=1670967452; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=p/GI6FNIzJRnBbEtJSRLeyRNy8FgPpkgoZ+66ISYfIE=; b=fHPyXY59ADEKkjPAm/TAF53D31xhYD0nEDbJdEtG7iP9KG11EltAMGiw +zEpf2XppvlGrHakPVPN3nHmoflhOhIqWcCxM6stFRugZhgtyubeo5K3C Xs+HU4GhnUY2YKmAVKfiX4b5kh+3IPM7I72VfBKuheFjruba3MP87A4VE /01cDXs1Y8dOq3LKJ2Udwjo5hmEq6winOsg00XgM3jfJBTPSJerZcgIVC IEqk9xyngCZ1LMioYahiDy0XndgockJErWZZqC9XtKnfCaurqIqU+YKPi 6NIhBGw49KHu3b5hpN4WAo5q3Ad2ESt8Sq5eEVjYgAnWCLgHp8NqC4jpd Q==; X-IronPort-AV: E=Sophos;i="5.88,203,1635177600"; d="scan'208";a="292142886" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 14 Dec 2021 05:37:31 +0800 IronPort-SDR: TTmWeBZ7ykYI1fJDU4CtJtzWu5Lw5Apl614CdGj0bcxXpS1Gl10SOkVmL0W2KQISzfgr0xh0Ve kgNqKl9bvnjR0Kj5UO8Hf6pK0YMNXB9aDVep98XNe4a1vrja0/JfgUKsR1+Val0x2Hz2zVcQnW bxwtdn7LMLv4xfA6Qm0AHKHrDq8iSdI4tOyxQ7LWu/AKbni38a+/CN4bOX7ygvzidRAbEDHqth rPvXNaN4NPInzBNSSfDGooiiXpIw32cCKlN3sjJ7U95xx9gWJ9nL6Bj4ewpuLYc8pyopoSb7y1 34ePMwTHm0YT30oLTdFle6bH Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2021 13:10:29 -0800 IronPort-SDR: ZTpp0b0lw7iPWCKuKS74BV4af5LKBvp0PVeq7x+8pJ2ioGXC3RUuCWQjMNILVe6bnz5c1rNJQZ LTvs+rEQvCud644f2gn4nmx3B24Zkml2IxaIuM83XRoJuxbMwELugqOgU8YBgU/3fomzNzMAxG 1RYqende20IcYfrO3jSeTGiteo+SZPRKRrsd7SbGrhihnkhjKFnTVnQMy8eLqLEo9u2KG/pJNF 3JhkY2d06KMgDSHg+adqZdEGAwk/PUsF2ZB9BqVyJFrS3DrUOWA8ekPTKfayXCmLhp3A2PAA9z wus= WDCIronportException: Internal Received: from usg-ed-osssrv.wdc.com ([10.3.10.180]) by uls-op-cesaip01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Dec 2021 13:37:32 -0800 Received: from usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTP id 4JCZbv1cRfz1Rvlf for ; Mon, 13 Dec 2021 13:37:31 -0800 (PST) Authentication-Results: usg-ed-osssrv.wdc.com (amavisd-new); dkim=pass reason="pass (just generated, assumed good)" header.d=opensource.wdc.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d= opensource.wdc.com; h=content-transfer-encoding:content-type :in-reply-to:organization:from:references:to:content-language :subject:user-agent:mime-version:date:message-id; s=dkim; t= 1639431450; x=1642023451; bh=p/GI6FNIzJRnBbEtJSRLeyRNy8FgPpkgoZ+ 66ISYfIE=; b=csGrzl4Ef2XD6pS33qD7pGUEvzgkysLbTbjE3JYTfBgH+vdAvPx Jfg7L8CtIQ3eNEAlLScyr51YZETgO+W7aNt1epC/GiBCe/1GrKw3+Cuqqus1h4yQ 2LYO20AoTaXCAl8bz541MSJ2aZPgocEHJRdyU+ipapCF0VtAha4ivKLNCmYFTGXW OWZ1OwAKTFI3BbewQB32L2wU81A6SnA3otTOws7LUDFonEWpiE6OLuMei88vrSbP KTnbULMUQJnPqcznvqVZAx+k6QjVRclM0ttssMnWfezY0FGGOpfeO4+jmzXCH6lN SZNAOP2T1hCH2Raub3qb24unix2uC5I74Iw== X-Virus-Scanned: amavisd-new at usg-ed-osssrv.wdc.com Received: from usg-ed-osssrv.wdc.com ([127.0.0.1]) by usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id bLJsP6rrjJeo for ; Mon, 13 Dec 2021 13:37:30 -0800 (PST) Received: from [10.225.54.48] (unknown [10.225.54.48]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4JCZbt39Nnz1RtVG; Mon, 13 Dec 2021 13:37:30 -0800 (PST) Message-ID: Date: Tue, 14 Dec 2021 06:37:29 +0900 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.4.0 Subject: Re: [PATCH RESEND 2] libata: if T_LENGTH is zero, dma direction should be DMA_NONE Content-Language: en-US To: George Kennedy Cc: linux-ide@vger.kernel.org, LKML References: <1f57bc3d-d125-7e09-4699-0338ddcc50f1@oracle.com> From: Damien Le Moal Organization: Western Digital In-Reply-To: <1f57bc3d-d125-7e09-4699-0338ddcc50f1@oracle.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org On 2021/12/14 0:33, George Kennedy wrote: > Avoid data corruption by rejecting pass-through commands where > T_LENGTH is zero (No data is transferred) and the dma direction > is not DMA_NONE. > > Cc: # 5.4.y 5.4 only ? What about other LTS versions ? They do not have that bug ? > Reported-by: syzkaller > Signed-off-by: George Kennedy > --- > drivers/ata/libata-scsi.c | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c > index 1b84d55..d428392 100644 > --- a/drivers/ata/libata-scsi.c > +++ b/drivers/ata/libata-scsi.c > @@ -2859,6 +2859,12 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) > goto invalid_fld; > } > > + /* if T_LENGTH is zero (No data is transferred), then dir should be DMA_NONE */ > + if ((cdb[2 + cdb_offset] & 3) == 0 && scmd->sc_data_direction != DMA_NONE) { > + fp = 2 + cdb_offset; > + goto invalid_fld; > + } > + > if (ata_is_ncq(tf->protocol) && (cdb[2 + cdb_offset] & 0x3) == 0) > tf->protocol = ATA_PROT_NCQ_NODATA; > > -- 1.8.3.1 > -- Damien Le Moal Western Digital Research