Re: F37 proposal: Add -fno-omit-frame-pointer to default compilation flags (System-Wide Change proposal)

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* Jeff Law:

> If I'm understanding things correctly, the original proposal is trying
> to make a very special case of profiling work better -- a case that 
> 99.9% of Fedora users do not need or care about.    That seems like a
> particularly bad cost/benefit for this proposal.

It became clear during yesterday's meeting that the actual goal is to
enable userspace backtraces that can be analyzed by BPF (in the kernel),
so it's not really about profiling.  Instead it's about enhancing the
capabilities of BPF.  Nobody mentioned this explicitly, but I expect one
could enhance osquery with this and push out BPF-based behavioral
analysis using osquery.  There is already some BPF support in osquery:

  Process and socket auditing with osquery
  <https://osquery.readthedocs.io/en/latest/deployment/process-auditing/>

There really should be a way to reach that goal in a more direction,
without having to rebuild the entire distribution with different
compiler flags.

The core issue here is that kernel people boycott both x86 hardware
shadow stacks *and* DWARF, which means that the most obvious approaches
are not available to us.

Thanks,
Florian
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