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Fuchsia has strict controls over who can map memory as executable.
Refactoring syz-executor to be able to do that involves a non trivial
amount of work: it needs to run as a fuchsia component and replace stdin
for some other mechanism to communicate with syz-fuzzer (probably a fidl
service and a thin client that proxies stdin/stdout to syz-fuzzer via
ssh).
Mapping memory as executable doesn't seem to be used or needed in
syz-executor at all. After talking with Dmitry, he mentioned that it was
used in a deprecated feature: `syz_execute_func` which would execute
random code. It also allows more scenarios during fuzzing.
For now, I'm removing that option to allow syzkaller continue fuzzing.
This change also refactors all of the error messages adding a string
representation of the `zx_status_t` in error logs.
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zx_deadline_after also returns time, not status.
So don't use it as coverage.
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The type size of long depends on compiler.
Therefore, changing to intptr_t makes it depends on architecture.
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Fuchsia recently changed such that zx_vmar_map can't be declared
executable and writeable at the same time; use a new syscall for this
purpose.
Also made a few errors more informative.
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zx_clock_get_monotonic was added,
zx_debuglog_read was renamed (or we forgot to add it earlier).
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Make as much code as possible shared between all OSes.
In particular main is now common across all OSes.
Make more code shared between executor and csource
(in particular, loop function and threaded execution logic).
Also make loop and threaded logic shared across all OSes.
Make more posix/unix code shared across OSes
(e.g. signal handling, pthread creation, etc).
Plus other changes along similar lines.
Also support test OS in executor (based on portable posix)
and add 4 arches that cover all execution modes
(fork server/no fork server, shmem/no shmem).
This change paves way for testing of executor code
and allows to preserve consistency across OSes and executor/csource.
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Lots of assorted heavylifting to support csource on fuchsia.
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