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Squash of:
* Doc typo
* Ported some tun related functions.
* Copy vnet.txt from linux to openbsd.
* Simplified syz_emit_ethernet and stubbed out vnet.txt.
* Undo clang-format header sorting: headers are order sensitive.
* Uniquify tap devices by pid.
* clang-format off for includes
* Happier clang-format.
* Partially revert "Uniquify tap devices by pid."
Just rely on procid magic instead of getting it from a flag.
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Currently we have a global fixed set of sandboxes,
which makes it hard to add new OS-specific ones
(all OSes need to updated to say that they don't
support this sandbox).
Let it each OS say what sandboxes it supports instead.
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executor: add support for android_untrusted_app sandbox
This adds a new sandbox type, 'android_untrusted_app', which restricts
syz-executor to the privileges which are available to third-party applications,
e.g. those installed from the Google Play store.
In particular, this uses the UID space reserved for applications (instead of
the 'setuid' sandbox, which uses the traditional 'nobody' user / 65534)
as well as a set of groups which the Android-specific kernels are aware of,
and finally ensures that the SELinux context is set appropriately.
Dependencies on libselinux are avoided by manually implementing the few
functions that are needed to change the context of the current process,
and arbitrary files. The underlying mechanisms are relatively simple.
Fixes google/syzkaller#643
Test: make presubmit
Bug: http://b/112900774
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all: add openbsd support
squash of the following commits:
* openbsd: add mandatory bits
* report: add OpenBSD support
* executor: skip building kvm on OpenBSD
* executor: add OpenBSD support
Linking against libutil is necessary due to usage of openpty(3).
* executor: fix typo in fail() message
* fixup! report: add OpenBSD support
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! openbsd: add mandatory bits
* fixup! report: add OpenBSD support
* gometalinter: skip sys/openbsd
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1. Remove unnecessary includes.
2. Remove thunk function in threaded mode.
3. Inline syscalls into main for the simplest case.
4. Define main in common.h rather than form with printfs.
5. Fix generation for repeat mode
(we had 2 infinite loops: in main and in loop).
6. Remove unused functions (setup/reset_loop, setup/reset_test,
sandbox_namespace, etc).
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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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The "define uint64_t unsigned long long" were too good to work.
With a different toolchain I am getting:
cstdint:69:11: error: expected unqualified-id
using ::uint64_t;
^
executor/common.h:34:18: note: expanded from macro 'uint64_t'
Do it the proper way: introduce uint64/32/16/8 types and use them.
pkg/csource then does s/uint64/uint64_t/ to not clutter code with
additional typedefs.
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I see a crash which says:
#0: too much cover 0 (errno 0)
while the code is:
uint64_t n = ...;
if (n >= kCoverSize)
fail("#%d: too much cover %u", th->id, n);
It seems that the high part of n is set, but we don't see it.
Add printf format attribute to fail and friends and fix all similar cases.
Caught a bunch of similar cases and a missing argument in:
exitf("opendir(%s) failed due to NOFILE, exiting");
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executor_netbsd.cc was including syscalls_freebsd.h,
which completely messed up syscall numbers and names.
Include the right syscalls header.
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