This commit contains the following changes:
- Call `waitpid()` on the child and the fork server when terminating the
fuzzer; thus, we do not end up with zombies.
- Rename `fsrv.kill_signal` to `fsrv.child_kill_signal`, since the
documentation states that the signal is used to terminate the *child*.
- Use SIGTERM instead of fsrv.(child)_kill_signal, thus the fork server
can always reap the child.
There was some confusion here due to name reuse. The
initializeModuleSanitizerCoverageLegacyPassPass() function was
actually calling the initialization of the upstream pass (which
no longer supports legacy PM and thus fails to build on LLVM 15).
The intention was to call the LTO initialization here.
Fix this by renaming symbols to avoid collision.
By removing ModuleSanitizerCoverageLegacyPass, which is completely
unused.
There was some confusing between the initialization function for
the upstream sancov pass and AFLs own implementation.
The provided function declaration F may not have valid location
information. Return an empty string in this case as the two callers are
already using this convention to filter out functions from being
instrumented when deny/allow list are used.
