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[Bug 1912614] Re: kASLR incorrectly described as disabled by default in Security/Features


Thanks a lot,

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  
Section "How can I help?" gave me the impression that Proof-reading and continuing with "Send in a bug report" (https://help.ubuntu.com/community/ReportingBugs) was the way of communicating errors in the wiki.

Regarding checking the status of kASLR:
I guess someone techy enough to care about kASLR will be able to work with the Solutions provided by @crass here: https://askubuntu.com/questions/704640/how-to-detect-in-runtime-is-kaslr-enabled-or-disabled :)

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  kASLR incorrectly described as disabled by default in

Status in ubuntu-docs package in Ubuntu:
  Fix Released

Bug description:
  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:

  cat /proc/cmdline
  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:
  cat /proc/sys/kernel/randomize_va_space

  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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