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The current common vcs interface and its implementations are designed to
support a very big number of situations (git modules, cleaning up
complex state, etc), which is too heavy and restrictive when we just
need a thin wrapper over the git command that supports a few basic
operations.
Refactor pkg/vcs to split out the wrapper code from the big git
implementation of the vcs.Repo interface.
Export the wrapper to enable reuse in other parts of the system.
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It might be the case that the kernels that are being fuzzed on syz-ci
require their own backports to build/test older revisions during
bisection.
Let users specify it in the syz-ci config.
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Refactor Minimize().
As a part of Minimize(), attempt to drop all unnecessary instrumentation
and test whether the kernel is still crashing.
This should reduce the number of irrelevant crashes during bisection and
thus increase bisection result quality.
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This allows us to bisect at least recently introduced bugs, where the
manager that found the bug uses a non standard compiler. This is usefull
during development of a new sanitizer for which a compiler with
non-upstreamed patches is required.
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Before we hardcoded bisection to use gcc, now the compiler family can
be configured in the bisection config.
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Store config options identified using DebugTracer. Also change bisection
and configuration minimization code to use new DebugTracer.
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Kconfig depends on the target arch.
Add target argument for Kconfig parsing.
Resolve $(SRCARCH) properly (previously we always assumed x86_64).
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We currently detect v5.10-rc1 as v5.9 because we ignore -rc tags.
This makes it impossible to enable configs that were already added for v5.10.
Treat v5.10-rc1 as v5.10 already.
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Use the new kconfig.Minimize for config minization
instead of the config-bisect.pl script.
This is mostly just deleting code.
Also update tests:
- minimization is now supposed to test the baseline config
(update "testos" stub accordingly)
- minimization is not supposed to return a config that does not build
(a reasonable config minimization procedure can't arrive to such config),
remove test that tests this
Update #2171
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Minimization must call the predicate
(otherwise how does it know this config triggers the crash?).
This does not matter now, but will matter in future.
Update #2171
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The pkg/vcs code assumed that we fully manage the repo
within an autonomous program. In particular it tried
to repair any errors by dropping and re-creating the repo.
This does not work well for command-line tools that work
with a user-provided repo. Add OptPrecious for such uses.
Update #2171
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Add ReleaseTag method that returns last release tag
for the given commit.
Update #2171
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Change a test to actually produce a new config as it is supposed
to do during config minimization and check the resulting config.
Add a regression test for the bug where we committed a broken config.
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Implement Linux kernel configuration bisection. Use bisected minimalistic
configuration in commit bisection. Utilizes config_bisect.pl script from Linux
kernel tree in bisection.
Modify syz-bisect to read in kernel.baseline_config. This is used as a "good"
configuration when bisection is run.
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All callers of EnvForCommit need the compiler path,
so move this logic into EnvForCommit to avoid duplication.
Also simplifies tests because test impl can now return
an empty compiler (which should be unused).
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(note: incomplete change)
Refactor existing code as follows:
* Move reusable test utility functions from git_repo_test.go to
pkg/vcs/test_util.go and make them exported.
* Split Run() into Run()+runImpl().
* Change type of bisect.go:env.inst to `instance.BuilderTester`.
Change usage inside syz-testbuild/testbuild.go accordingly.
* Move most of linux.PreviousReleaseTags() into vcs/git.go as
git.previousReleaseTags().
* Allow build.CompilerIdentity to be mocked.
Introduce the following changes:
* instance.BuilderTester is an interface with methods
BuildSyzkaller()
BuildKernel()
Test()
NewEnv() now returns this interface.
* type testEnv implements instance.BuilderTester.
* type testBuilder implements builder interface. Add a entry into table
inside pkg/build/build.go:getBuilder() to return testBuilder object.
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