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Property:Pseudo-Update

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Term

Goto:   Examples  -  FRITZ!OS   -   SMW-Browser

Details

A Pseudo-Update is a pseudo Firmware-Update intended to run a temporary script on a box.

It only works if the installed firmware supports updates with unsigned Firmware-Images.

Background:

A Firmware-Image is an uncompressed tar archive containing the Firmware-Files, all stored in /var or subfolders of /var.
During an update this archive is extracted to / so all files are located in RAM after.

Next the signatures are verified. If they are invalid and the installed firmware supports unsigned Firmware-Images then a
warning is displayed offering the option to continue anyway, otherwise the update fails and the box reboots without changes.

After the signature test is passed or defeated the /var/install script is called, performing the update.

A minimalistic Pseudo-Update image is a tar archive just containing /var/install, with arbitary content.
However, this only works if the installed firmware supports updates with unsigned Firmware-Images.

For security reasons AVM removed the support for unsigned Firmware-Images in FRITZ!OS 6.50.

Examples

Likely the oldest Pseudo-Update (2005-01-19) comes from Enrik Berkhan:

It temporarily activates Telnet using this /var/install script:

#! /bin/sh

/usr/sbin/telnetd -l /sbin/ar7login

exit 0 

SMW-Browser

Information is currently being retrieved from the backend.
 

Synonyms

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