Re: [PLUG] why is /dev/null getting flamozzled?

[Art Alexion <art.alexion@verizon.net>]

On Friday 30 March 2007 03:17, sean finney wrote:
> On Thu, 2007-03-29 at 11:16 -0400, Art Alexion wrote:
> > Lately, when I reboot, X won't start because /dev/null has become
> > read-only at the user level, specifically crwx-r--r--.
>
> just an idea, or at least an initial direction to look: i tried
> disabling udev once only to discover that various devices
> like /dev/null, /dev/zero, and /dev/random didn't have their permissions
> properly set.
>
> turns out there's a udev rule responsible for setting the proper
> ownership/permissions, so you're more or less stuck running udev on
> ubuntu (i don't know if it's the same on debian).  so, maybe udev isn't
> running, or you somehow lost the file that sets the permissions?
>
> on my system (etch laptop) the file is /etc/udev/permissions.rules.

On ubuntu, it seems to be /etc/udev/permissions.d/udev.permissions which 
includes:

# character devices

ptmx:root:tty:0666
random:root:root:0666
urandom:root:root:0444
kmem:root:kmem:0640
mem:root:kmem:0640
port:root:kmem:0640
null:root:root:0666
zero:root:root:0666
full:root:root:0666

and/or /etc/udev/rules.d/40-permissions.rules which includes:

# Other devices, by name
KERNEL=="null",                         MODE="0666"
KERNEL=="zero",                         MODE="0666"

both of which seem correct.

I am guessing that /dev/null only resides in RAM and not on the hard drive, 
eliminating the possibility of a bad block on the disk.

-- 

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