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Comment by RedCrowbar | Hacker News Reader

cat /proc/cpuinfo | grep pti

What is the expected outcome if its patched vs. not?

I am getting:

  fpu_exception	: yes

You should see "pti" on the "flags" line of /proc/cpuinfo. You apparently don't, so you don't have page table isolation.

No, he shouldn’t be seeing that regardless as it doesn’t match the grep regex. I don’t know what, though.

Edit: facepalm. Or should that be foot-in-mouth?

It does match the regex. "pti" is a substring in "exception"

Thanks. I feel stupid, I looked that line up, down, and sideways for a match :/

I was wrong

I currently have the following system (up-to-date):

  Ubuntu 16.04.3 LTS (GNU/Linux 4.4.0-104-generic x86_64)

I ran the following command:

  sudo cat /proc/cpuinfo | grep pti

which returned:

  fpu_exception	: yes

Note the instance of 'pti' in the word 'exception'.

fpu_excePTIon