[ubuntu-hardened] KASLR: enabling on x86 with "kaslr" option via '/etc/default/grub' file.

Seth Arnold seth.arnold at canonical.com
Wed Jul 19 19:32:14 UTC 2017

On Wed, Jul 19, 2017 at 06:41:15PM +0200, daniel curtis wrote:
> I'm thinking about GRUB and '/etc/default/grub' file - that controls the
> operation of grub-mkconfig(8). Generally, I want to skip pressing 'e'
> button when menu shows up etc. There is one option:
> "GRUB_CMDLINE_LINUX_DEFAULT=" containing "quiet splash" options. Can I
> simply add "kaslr"at the very end? Then, I'll get: "quiet splash kaslr". Is
> that OK?
> If this is a good way to enable KASLR, then I have to automatically
> re-generate the 'grub.cfg' file, right? I know, that there are two commands
> to do this: update-grub(8) and grub-mkconfig(8).

Hi Daniel, this is exactly how the kernel command line is intended to be
used -- hand-editing for simple tests, editing the /etc/default/grub for
long-lived changes, and re-generating the _real_ grub configuration using
the update-grub command.

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