Anybody want to talk about Dirty Cow? Post: 302984409

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The Lounge What is on Your Mind? Anybody want to talk about Dirty Cow? Post 302984409 by wisecracker on Tuesday 25th of October 2016 03:49:40 PM

10-25-2016

Registered User

The thing is that according to RedHat the attacker has to be a local user, which implies that you know the local user, with unprivileged access. It does not say whether that user is allowed to execute code loaded from an external source, e.g. USB memory stick...
As I am not a professional I must assume that standard users are NOT allowed only admin' staff.

CVE-2016-5195 - Red Hat Customer Portal

However, and to me this is a big however, the Rowhammer _bug_ is much more serious as it can be buried inside a """free""" app' that could be DLed from so-called reputable sources and be stealthily called or installed inside what looks like a _cool_ app'. NASTY!

As we all know race conditions occur all the time in both HW and/or SW.
I had the condition(s) on both the AMIGA1200 and PC parallel ports when accessing HW I built many years ago so I am aware of situations like this. Obviously these were not OS crippling events but they taught me a lot and to research more about the situation.

Current technology is frighteningly quick compared to those units of yesteryear so even nanoseconds can be the breakpoint of today's HW...

I can't find any test code for Rowhammer though to see how it works... ;o(

...But I could guess though and probably be close enough without any said test code.

wisecracker

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LEARN ABOUT NETBSD

urlphy

URL(4)							   BSD Kernel Interfaces Manual 						    URL(4)

NAME

     url -- Realtek RTL8150L USB Ethernet driver

SYNOPSIS

     url*    at uhub?
     urlphy* at mii?

DESCRIPTION

     The url driver provides support for USB Ethernet adapters based on the Realtek RTL8150L USB-ether bridge chip.

     The url driver supports the following adapters:

	   CompUSA USBKR100
	   GreenHouse GH-USB100B
	   Melco Inc. LUA-KTX
	   Sitecom LN013

     For more information on configuring this device, see ifconfig(8).

DIAGNOSTICS

     url%d: watchdog timeout  A packet was queued for transmission and a transmit command was issued, however the device failed to acknowledge the
     transmission before a timeout expired.

     url%d: no memory for rx list  The driver failed to allocate an mbuf for the receiver ring.

SEE ALSO

     arp(4), mii(4), netintro(4), usb(4), ifconfig(8)

HISTORY

     The url device driver first appeared in NetBSD 1.6.

AUTHORS

     The url driver was written by Shingo WATANABE <nabe@nabechan.org>.

BSD
								September 18, 2006							       BSD