On Fri, Nov 29, 2019 at 09:34:35PM +0000, Oleinik, Alexander wrote: > This series adds a framework for coverage-guided fuzzing of > virtual-devices. Fuzzing targets are based on qtest and can make use of > the libqos abstractions. > > In this version, I added a virtio-scsi fuzzer. The actual fuzzing code > is very similar to the the virtio-net fuzzer. I experimented with using > a single fuzzer with device-specific initialization for each virtio > device, but it did not come out as cleanly as I hoped, since I could not > find an easy way to override the qos drivers for devices that have > more-complete qos support (such as virtio-net), so these changes have > not made it into v6. > > V5/V6: (V5 did not have review tags) > * added virtio-scsi fuzzer > * add support for using fork-based fuzzers with multiple libfuzzer > workers > * misc fixes addressing V4 comments > * cleanup in-process handlers/globals in libqtest.c > * small fixes to fork-based fuzzing and support for multiple workers > * changes to the virtio-net fuzzer to kick after each vq add > > V4: > * add/transfer license headers to new files > * restructure the added QTestClientTransportOps struct > * restructure the FuzzTarget struct and fuzzer skeleton > * fork-based fuzzer now directly mmaps shm over the coverage bitmaps > * fixes to i440 and virtio-net fuzz targets > * undo the changes to qtest_memwrite > * possible to build /fuzz and /all in the same build-dir > * misc fixes to address V3 comments > > V3: > * rebased onto v4.1.0+ > * add the fuzzer as a new build-target type in the build-system > * add indirection to qtest client/server communication functions > * remove ramfile and snapshot-based fuzzing support > * add i440fx fuzz-target as a reference for developers. > * add linker-script to assist with fork-based fuzzer > > V2: > * split off changes to qos virtio-net and qtest server to other patches > * move vl:main initialization into new func: qemu_init > * moved useful functions from qos-test.c to a separate object > * use struct of function pointers for add_fuzz_target(), instead of > arguments > * move ramfile to migration/qemu-file > * rewrite fork-based fuzzer pending patch to libfuzzer > * pass check-patch > > Alexander Bulekov (21): > softmmu: split off vl.c:main() into main.c > libqos: Rename i2c_send and i2c_recv > fuzz: Add FUZZ_TARGET module type > qtest: add qtest_server_send abstraction > libqtest: Add a layer of abstraciton to send/recv > module: check module wasn't already initialized > qtest: add in-process incoming command handler > tests: provide test variables to other targets > libqos: split qos-test and libqos makefile vars > libqos: move useful qos-test funcs to qos_external > libqtest: make bufwrite rely on the TransportOps > libqtest: add in-process qtest.c tx/rx handlers > fuzz: add configure flag --enable-fuzzing > fuzz: Add target/fuzz makefile rules > fuzz: add fuzzer skeleton > fuzz: add support for fork-based fuzzing. > fuzz: add support for qos-assisted fuzz targets > fuzz: add i440fx fuzz targets > fuzz: add virtio-net fuzz target > fuzz: add virtio-scsi fuzz target > fuzz: add documentation to docs/devel/ > > Makefile | 16 ++- > Makefile.objs | 4 + > Makefile.target | 18 ++- > configure | 39 ++++++ > docs/devel/fuzzing.txt | 119 +++++++++++++++++ > exec.c | 12 +- > include/qemu/module.h | 4 +- > include/sysemu/qtest.h | 4 + > include/sysemu/sysemu.h | 4 + > main.c | 53 ++++++++ > qtest.c | 31 ++++- > tests/Makefile.include | 75 +++++------ > tests/fuzz/Makefile.include | 12 ++ > tests/fuzz/fork_fuzz.c | 55 ++++++++ > tests/fuzz/fork_fuzz.h | 23 ++++ > tests/fuzz/fork_fuzz.ld | 37 ++++++ > tests/fuzz/fuzz.c | 179 ++++++++++++++++++++++++++ > tests/fuzz/fuzz.h | 94 ++++++++++++++ > tests/fuzz/i440fx_fuzz.c | 176 ++++++++++++++++++++++++++ > tests/fuzz/qos_fuzz.c | 232 ++++++++++++++++++++++++++++++++++ > tests/fuzz/qos_fuzz.h | 33 +++++ > tests/fuzz/virtio_net_fuzz.c | 105 +++++++++++++++ > tests/fuzz/virtio_scsi_fuzz.c | 200 +++++++++++++++++++++++++++++ > tests/libqos/i2c.c | 10 +- > tests/libqos/i2c.h | 4 +- > tests/libqos/qos_external.c | 168 ++++++++++++++++++++++++ > tests/libqos/qos_external.h | 28 ++++ > tests/libqtest.c | 108 ++++++++++++++-- > tests/libqtest.h | 4 + > tests/pca9552-test.c | 10 +- > tests/qos-test.c | 140 +------------------- > util/module.c | 7 + > vl.c | 38 ++---- > 33 files changed, 1813 insertions(+), 229 deletions(-) > create mode 100644 docs/devel/fuzzing.txt > create mode 100644 main.c > create mode 100644 tests/fuzz/Makefile.include > create mode 100644 tests/fuzz/fork_fuzz.c > create mode 100644 tests/fuzz/fork_fuzz.h > create mode 100644 tests/fuzz/fork_fuzz.ld > create mode 100644 tests/fuzz/fuzz.c > create mode 100644 tests/fuzz/fuzz.h > create mode 100644 tests/fuzz/i440fx_fuzz.c > create mode 100644 tests/fuzz/qos_fuzz.c > create mode 100644 tests/fuzz/qos_fuzz.h > create mode 100644 tests/fuzz/virtio_net_fuzz.c > create mode 100644 tests/fuzz/virtio_scsi_fuzz.c > create mode 100644 tests/libqos/qos_external.c > create mode 100644 tests/libqos/qos_external.h
Please use "git rebase -i origin/master" with "x make" after each commit to verify that building succeeds. This is important for git-bisect(1) where we need the tree to always build successfully and for cherry-picking patches without introducing breakage. It's not enough for the tree to build at the end of the patch series. It should build at each step along the way.
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