linux-kernel - [PATCH libata-dev#upstream-fixes] libata: ignore CFA signature while sanity-checking an ATAPI device

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20060907113224.GA21853@htj.dyndns.org>
Date:	Thu, 7 Sep 2006 20:32:24 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Jeff Garzik <jgarzik@...ox.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"J.A. Magallon" <jamagallon@....com>
Subject: [PATCH libata-dev#upstream-fixes] libata: ignore CFA signature while sanity-checking an ATAPI device

0x848a in ID word 0 indicates CFA device iff the ID data is obtained
from IDENTIFY DEVICE.  For ATAPI devices, 0x848a in ID work 0
indicates valid ATAPI device.  Fix sanity check in ata_dev_read_id()
such that ATAPI devices reporting 0x848a in ID word 0 is not handled
as error.

The problem is identified by J.A. Magallon with HL-DT-ST DVDRAM
GSA-4120B.

Signed-off-by: Tejun Helo <htejun@...il.com>
Cc: J.A. Magallon <jamagallon@....com>
---
Jeff, this is a regression and thus should go into .19.

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 73dd6c8..427b73a 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -1256,10 +1256,15 @@ int ata_dev_read_id(struct ata_device *d
 	swap_buf_le16(id, ATA_ID_WORDS);
 
 	/* sanity check */
-	if ((class == ATA_DEV_ATA) != (ata_id_is_ata(id) | ata_id_is_cfa(id))) {
-		rc = -EINVAL;
-		reason = "device reports illegal type";
-		goto err_out;
+	rc = -EINVAL;
+	reason = "device reports illegal type";
+
+	if (class == ATA_DEV_ATA) {
+		if (!ata_id_is_ata(id) && !ata_id_is_cfa(id))
+			goto err_out;
+	} else {
+		if (ata_id_is_ata(id))
+			goto err_out;
 	}
 
 	if (post_reset && class == ATA_DEV_ATA) {
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/