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Robert Connolly | 16 May 2007 07:34
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entropy hint update

Hello. Please update the attached hint.

robert

AUTHOR:		Robert Connolly <robert at linuxfromscratch dot org> (ashes)

DATE:		2007-05-16

LICENSE:	Public Domain

SYNOPSIS:	Entropy and random number generators in Linux

PRIMARY URL:	http://www.linuxfromscratch.org/hints/

DESCRIPTION:
The word "entropy" generally means "chaos", "disorder", or "uncertainty". In
this hint "entropy" is used to describe random computer data.

Many system components depend on entropy (random numbers) for various tasks.
One of the simplest examples would be the fortune(6) program, which gives a
random quote from a list when we log in. Another simple example is a solitaire
card game, or the shuffle option in a music player. Without random numbers
these programs would generate the same results every time they run. The above
examples are low security applications. It is not critical for them to use
high quality random numbers, and in applications like these the current system
time and date is usually an adequate source of entropy.

Examples of medium security uses for entropy would be applications like
mktemp(1), password salt, or the Stack Smashing Protector (SSP) GCC feature.
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Bryan Kadzban | 16 May 2007 13:12

Re: entropy hint update

Robert Connolly wrote:
> Add Udev permissions with the following command:
> echo "erandom:root:root:0444
> frandom:root:root:0444" >> /etc/udev/permissions.d/25-lfs.permissions
> 

FYI, this is no longer supported by the current LFS version of udev.

It should be:

echo 'NAME=="erandom", MODE="0444"
NAME=="frandom", MODE="0444"' >>/etc/udev/rules.d/25-lfs.rules

(The default UID and GID are both 0.)


Robert Connolly wrote:
> Add Udev permissions with the following command:
> echo "erandom:root:root:0444
> frandom:root:root:0444" >> /etc/udev/permissions.d/25-lfs.permissions
> 

FYI, this is no longer supported by the current LFS version of udev.

It should be:

echo 'NAME=="erandom", MODE="0444"
NAME=="frandom", MODE="0444"' >>/etc/udev/rules.d/25-lfs.rules
(Continue reading)

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Robert Connolly | 16 May 2007 13:51
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Re: entropy hint update

On Wednesday May 16 2007 07:12, Bryan Kadzban wrote:
> Robert Connolly wrote:
> > Add Udev permissions with the following command:
> > echo "erandom:root:root:0444
> > frandom:root:root:0444" >> /etc/udev/permissions.d/25-lfs.permissions
>
> FYI, this is no longer supported by the current LFS version of udev.
>
> It should be:
>
> echo 'NAME=="erandom", MODE="0444"
> NAME=="frandom", MODE="0444"' >>/etc/udev/rules.d/25-lfs.rules
>
> (The default UID and GID are both 0.)

Thanks. I also found a "__linux" typo. New hint is attached.

robert

AUTHOR:		Robert Connolly <robert at linuxfromscratch dot org> (ashes)

DATE:		2007-05-16

LICENSE:	Public Domain

SYNOPSIS:	Entropy and random number generators in Linux

PRIMARY URL:	http://www.linuxfromscratch.org/hints/
(Continue reading)

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