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The previous strategy (delay kcov instance creation) seems not to work
very well in carefully sandboxed environments. Let's see if the new
approach is more versatile.
Open a kcov handle for each thread at syz-executor's initialization, but
don't mmap it right away.
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As now kcov instances may get set up during fuzzing, performing dup2 in
cover_open is no longer safe as it may close some important resource.
Prevent that by reserving most of fds that belong to the kcov fds range.
Unfortunately we must duplicate the code because of the way kcov
implementations are organized.
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gvisor coverage is not a trace, so producing edges won't work.
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Add functions to protect and unprotect the coverage buffer. The buffer is
protected from being written to while tracing. When the trace data is
sorted we need to make it read/write, but can return it to read only after
this has completed.
Leave the first page as read/write as we need to clear the length field.
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Right now syzkaller only supports coverage collected from the threads that
execute syscalls. However some useful things happen in background threads,
and it would be nice to collect coverage from those threads as well.
This change adds extra coverage support to syzkaller. This coverage is not
associated with a particular syscall, but rather with the whole program.
Executor passes extra coverage over the same ipc mechanism to syz-fuzzer
with syscall number set to -1. syz-fuzzer then passes this coverage to
syz-manager with the call name "extra".
This change requires the following kcov patch:
https://github.com/xairy/linux/pull/2
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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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