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Re: [Bug 1912614] Re: kASLR incorrectly described as disabled by default in Security/Features
On Fri, Jan 22, 2021 at 01:09:13PM -0000, lo-na-aleim wrote:
> Sorry for reaching out in the wrong place. I guess the right place for this would have been the mailing list?
> I started from: https://wiki.ubuntu.com/DocumentationTeam/SystemDocumentation
Actually, thanks for this, I'll amend the script that emits the page to
suggest exactly this -- the mail list, #ubuntu-hardened on
irc.freenode.net, or https://discourse.ubuntu.com/c/security/33
> I guess someone techy enough to care about kASLR will be able to work
> with the Solutions provided by @crass here:
Yes, it's detailed enough that it's bound to be useful for someone who
*really* wants to get into this. :)
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kASLR incorrectly described as disabled by default in
Status in ubuntu-docs package in Ubuntu:
According to: https://wiki.ubuntu.com/Security/Features kASLR is disabled by default. Additionally,
it is reported that enabling kASLR will disable the ability to hibernate.
I think that this is no longer true, but I don't want to edit the wiki without clarifying some details.
I discovered the active kASRL when I spun up a qemu vm with Ubuntu 20.04, all defaults and ran volatility3 on a memory dump. On the vm itself the kernel params do not mention kASLR / Kernel hardening:
BOOT_IMAGE=/boot/vmlinuz-5.4.0-58-generic root=UUID=eb6426f9-969b-4ce8-a690-ef87e410d5bf ro quiet splash vt.handoff=7
I also found this somewhere as a supposedly reliable way to tell if kASLR is on:
I asked a colleague who runs his ubuntu 20.04 directly on his laptop
for his cmdline and randomize_va_space, same results. He said he did
not knowingly touch any settings regarding kASLR.
Now, it seems like at some point kASLR became on by default. But I am
not really sure whether it still affects hibernation? I can't find
anything reliable on the wiki. My colleague is not sure whether he
disabled hibernation for different reasons or whether it was disabled
in the first place and I don't want to use my vm as reference, since
its not necessarily a "typical environment".
Note, the answers here should be updated as well, since checking the
kernel params will no longer be reliable.
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