d45054dbd2
Summary: As discussed in https://github.com/google/oss-fuzz/issues/933, it would be really awesome to be able to use ThinLTO for fuzzing. However, as @kcc has pointed out, it is currently undefined (untested) whether the sanitizers actually function properly with LLD and/or LTO. This patch is inspired by the cfi test, which already do test with LTO (and/or LLD), since LTO is required for CFI to function. I started with UBSan, because it's cmakelists / lit.* files appeared to be the cleanest. This patch adds the infrastructure to easily add LLD and/or LTO sub-variants of the existing lit test configurations. Also, this patch adds the LLD flavor, that explicitly does use LLD to link. The check-ubsan does pass on my machine. And to minimize the [initial] potential buildbot breakage i have put some restrictions on this flavour. Please review carefully, i have not worked with lit/sanitizer tests before. The original attempt, r319525 was reverted in r319526 due to the failures in compiler-rt standalone builds. Reviewers: eugenis, vitalybuka Reviewed By: eugenis Subscribers: #sanitizers, pcc, kubamracek, mgorny, llvm-commits, mehdi_amini, inglorion, kcc Differential Revision: https://reviews.llvm.org/D39508 llvm-svn: 319575
47 lines
2.0 KiB
INI
47 lines
2.0 KiB
INI
import lit.formats
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import os
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config.name = 'cfi' + config.name_suffix
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config.suffixes = ['.c', '.cpp', '.test']
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config.test_source_root = os.path.dirname(__file__)
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def build_invocation(compile_flags):
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return " " + " ".join([config.clang] + compile_flags) + " "
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clang = build_invocation([config.target_cflags])
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clangxx = build_invocation([config.target_cflags] + config.cxx_mode_flags)
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config.substitutions.append((r"%clang ", clang + ' '))
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config.substitutions.append((r"%clangxx ", clangxx + ' '))
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if config.lto_supported:
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clang_cfi = clang + '-fsanitize=cfi '
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if config.cfi_lit_test_mode == "Devirt":
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config.available_features.add('devirt')
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clang_cfi += '-fwhole-program-vtables '
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config.substitutions.append((r"%expect_crash_unless_devirt ", ""))
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else:
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config.substitutions.append((r"%expect_crash_unless_devirt ", config.expect_crash))
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cxx = ' '.join(config.cxx_mode_flags) + ' '
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diag = '-fno-sanitize-trap=cfi -fsanitize-recover=cfi '
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non_dso = '-fvisibility=hidden '
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dso = '-fsanitize-cfi-cross-dso -fvisibility=default '
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if config.android:
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dso += '-include ' + config.test_source_root + '/cross-dso/util/cfi_stubs.h '
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config.substitutions.append((r"%clang_cfi ", clang_cfi + non_dso))
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config.substitutions.append((r"%clangxx_cfi ", clang_cfi + cxx + non_dso))
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config.substitutions.append((r"%clang_cfi_diag ", clang_cfi + non_dso + diag))
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config.substitutions.append((r"%clangxx_cfi_diag ", clang_cfi + cxx + non_dso + diag))
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config.substitutions.append((r"%clangxx_cfi_dso ", clang_cfi + cxx + dso))
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config.substitutions.append((r"%clangxx_cfi_dso_diag ", clang_cfi + cxx + dso + diag))
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config.substitutions.append((r"%debug_info_flags", ' '.join(config.debug_info_flags)))
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else:
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config.unsupported = True
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if config.default_sanitizer_opts:
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config.environment['UBSAN_OPTIONS'] = ':'.join(config.default_sanitizer_opts)
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if lit_config.params.get('check_supported', None) and config.unsupported:
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raise BaseException("Tests unsupported")
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