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Feature checking procedure is split into 2 phases:
1. syz-fuzzer invokes "syz-executor setup feature" for each feature one-by-one,
and checks if executor does not fail.
Executor can also return a special "this feature does not need custom setup",
this allows to not call setup of these features in each new VM.
2. pkg/vminfo runs a simple program with ipc.ExecOpts specific for a concrete feature,
e.g. for wifi injection it will try to run a program with wifi feature enabled,
if setup of the feature fails, executor should also exit with an error.
For coverage features we also additionally check that we actually got coverage.
Then pkg/vminfo combines results of these 2 checks into final result.
syz-execprog now also uses vminfo package and mimics the same checking procedure.
Update #1541
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For some reason it started to consistently timeout on CI
(got 3 failures in a row). Disable it under race detector.
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When syz-fuzzer starts, it tries all syscalls to filter out any that are
not supported. This process should include only the syscalls that are
enabled using the 'enable_syscalls' and 'disable_syscalls' fields in
syz-manager's config.
This is useful for fuzzing Cuttlefish devices, for example, where the
'vhost_vsock' syscall needs to be excluded from fuzzing and from this
test.
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To reduce diff in future changes. Currently no-op.
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pkg/host/host_linux.go: Add "arm" to kallsyms support test.
pkg/host/host_test.go: TestKallsymsParse(): Add entry to test arm kallsyms parsing support.
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Start with a few simple tests that can be extended when needed.
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akaros can't have own host version
because fuzzer does not run on akaros,
so just disable it all.
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Detect supported syscall by directly executing them
if kallsyms is not present. This is required for gvisor testing.
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Currently host feature detection/setup code is spread
across platform-independent fuzzer code, pkg/host, pkg/ipc
and executor.
Move this all into pkg/host and show readable info
about features on manager start.
Fixes #46
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Now each prog function accepts the desired target explicitly.
No global, implicit state involved.
This is much cleaner and allows cross-OS/arch testing, etc.
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Add target config parameter (e.g. linux/amd64) which controls target OS/arch.
No more explicit assumptions about target.
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Large overhaul moves syscalls and arg types from sys to prog.
Sys package now depends on prog and contains only generated
descriptions of syscalls.
Introduce prog.Target type that encapsulates all targer properties,
like syscall list, ptr/page size, etc. Also moves OS-dependent pieces
like mmap call generation from prog to sys.
Update #191
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In preparation for moving sys types to prog
to avoid confusion between sys.Call and prog.Call.
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