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Re: comment and new question--when do upgrades take effect (was: Re: Kernel for Spectre and Meltdown)

On Mon, Jan 29, 2018 at 08:18:35AM -0500, rhkramer@xxxxxxxxx wrote:
> I regularly download "security" upgrades for Wheezy.  I assume that most of 
> those don't take effect until I restart the application.  For instance, a 
> Firefox upgrade does not take effect until I shutdown Firefox and restart it.
That is correct.

> Correspondingly, I assume that a Linux kernel upgrade does not take effect 
> until I reboot the machine.
Also correct.

You also need to be careful of library upgrades.  Fore xample, if there
is an update to libssl, then any application that uses it (i.e.,
dynamically links it or dlopens it) needs to be restarted.  If you run
Postfix and Apache (and have their SSL features configured and active)
you would need to restart them following a libssl upgade in order to
ensure that they are using the latest version.



Roberto C. Sánchez