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When comparisons are enabled fuzzer somehow manages to discover
the output region and corrupt it. It seems to fetch the address
from some memory operations (mmap/munmap).
Don't leak the output region address.
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It seems to explode linux corpus.
So make it freebsd-specific.
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Use forkserver and shmem for freebsd.
This greatly improves speed.
Also introduce fallback coverage signal based
on unique (syscall+errno) pairs.
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1. remove workaround for pthread attrs (was fixed in akaros)
2. remove workaround for dup2 (was fixed in akaros)
3. check that we receive a program
4. implement timeout for test processes
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We currently use more complex and functional protocol on linux,
and a simple ad-hoc protocol on other OSes.
This leads to code duplication in both ipc and executor.
Linux supports coverage, shared memory communication and fork server,
which would also be useful for most other OSes.
Unify communication protocol and parametrize it by
(1) use of shmem or only pipes, (2) use of fork server.
This reduces duplication in ipc and executor and will
allow to support the useful features for other OSes easily.
Finally, this fixes akaros support as it currently uses
syz-stress running on host (linux) and executor running on akaros.
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KCOV comparisons support is in the kernel mm tree already, and the
patch contains an additional uint64_t to store PCs of functions calling
__sanitizer_cov_trace_XXX().
Change kcov_comparison_t accordingly.
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