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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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They do not exist on ARM64 Linux and break syzkaller tests on them.
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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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"make generate" produces this diff when go 1.17 (go1.17-c95464f0ea3f==upstream)
is used. Seems compatible with >=1.16.
https://github.com/golang/go/commit/4d2d89ff42ca documents the syntax.
https://github.com/golang/go/commit/eeadce2d8713 enforces "ignore" for
unsatisfiable tags hence the pkg/csource/gen.go change.
Signed-off-by: Alexey Kardashevskiy <aik@linux.ibm.com>
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WiFi setup fails on 4.4 kernel with:
2020/11/28 12:22:49 BUG: program execution failed: executor 0: exit status 67
initialize_wifi_devices: failed to create device #0 (errno 19)
There is at least HWSIM_ATTR_PERM_ADDR not support, but maybe something else.
The setup seems to work at least on 4.17 where HWSIM_ATTR_PERM_ADDR was added.
So require at least 4.17 for WiFi testing.
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We use strings to identify OS/Arch.
These strings are duplicated throughout the code base massively.
golangci-lint points to possiblity of typos and duplication.
We already had to define these names in pkg/csource
and disable checking for prog package. A future change triggers
such warnings in another package.
Add OS/Arch name consts to sys/targets so that they can be used
to refer to OS/Arch. Use the consts everywhere.
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Fix capitalization, dots at the end
and two spaces after a period.
Update #1876
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Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
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* mmap syscall is special on Linux s390x because
the parameters for this syscall are passed as a struct
on user stack instead of registers.
* Introduce the SyscallTrampolines table into targets.Target
to address the above problem.
* There is a bug in Linux kernel s390x which causes QEMU TCG
to hang when KASAN is enabled. The bug has been fixed
in the forthcoming Linux 5.8 version. Until then do not enable
KASAN when using QEMU TCG, QEMU KVM shall have no problems with
KASAN.
Signed-off-by: Alexander Egorenkov <Alexander.Egorenkov@ibm.com>
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pkg/host does 2 things: detects supported syscalls and supported features.
There is enough code for each for a separate file.
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