[Bug bpf/24358] 32-bit stapbpf: things need fixing re: (void *) use in libbpf and elsewhere

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=24358

Serhei Makarov <me at serhei dot io> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|32-bit stapbpf: could not   |32-bit stapbpf: things need
                   |find _stext in              |fixing re: (void *) use in
                   |/proc/kallsyms              |libbpf and elsewhere

--- Comment #1 from Serhei Makarov <me at serhei dot io> ---
In principle, we want to add 32-bit support. (Currently there is no 32-bit
Fedora bcc package either.)

The kallsyms parsing code in stapbpf.cxx had been hardcoded in a way that only
works on 64-bit architectures. This is an easy fix, but unmasks a whole range
of other issues that block stapbpf from working on 32-bit. Lots of code in
libbpf assumes void* is interchangeable with __u64, which leads to 'stack
smashing' errors on map read/write system calls. 

Up to now, serious testing/qa for stapbpf has targeted x86_64, which is why
this issue came up only when I went to make serious transport changes and
decided these merited checking for regressions on other architectures.

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