netdev - [PATCH net] r8152: Fix broken RX checksums.

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: <9fb6be7b-95f3-6e59-c0f4-1d6c3357416d@pobox.com>
Date:   Sun, 30 Oct 2016 19:28:27 -0400
From:   Mark Lord <mlord@...ox.com>
To:     nic_swsd@...ltek.com, netdev@...r.kernel.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Cc:     stable@...r.kernel.org
Subject: [PATCH net] r8152: Fix broken RX checksums.

The r8152 driver has been broken since (approx) 3.16.xx
when support was added for hardware RX checksums
on newer chip versions.  Symptoms include random
segfaults and silent data corruption over NFS.

The hardware checksum logig does not work on the VER_02
dongles I have here when used with a slow embedded system CPU.
Google reveals others reporting similar issues on Raspberry Pi.

So, disable hardware RX checksum support for VER_02, and fix
an obvious coding error for IPV6 checksums in the same function.

Because this bug results in silent data corruption,
it is a good candidate for back-porting to -stable >= 3.16.xx.

Signed-off-by: Mark Lord <mlord@...ox.com>

--- old/drivers/net/usb/r8152.c	2016-09-30 04:20:43.000000000 -0400
+++ linux/drivers/net/usb/r8152.c	2016-10-26 14:15:44.932517676 -0400
@@ -1645,7 +1645,7 @@
 	u8 checksum = CHECKSUM_NONE;
 	u32 opts2, opts3;

-	if (tp->version == RTL_VER_01)
+	if (tp->version == RTL_VER_01 || tp->version == RTL_VER_02)
 		goto return_result;

 	opts2 = le32_to_cpu(rx_desc->opts2);
@@ -1660,7 +1660,7 @@
 			checksum = CHECKSUM_NONE;
 		else
 			checksum = CHECKSUM_UNNECESSARY;
-	} else if (RD_IPV6_CS) {
+	} else if (opts2 & RD_IPV6_CS) {
 		if ((opts2 & RD_UDP_CS) && !(opts3 & UDPF))
 			checksum = CHECKSUM_UNNECESSARY;
 		else if ((opts2 & RD_TCP_CS) && !(opts3 & TCPF))