Fix various undefined behavior found by UBSan.
* Fix non-null violation in strstream.cpp Overflow was calling memcpy with a null parameter and a size of 0. * Fix std/atomics/atomics.flag/ tests: a.test_and_set() was reading from an uninitialized atomic, but wasn't using the value. The tests now clear the flag before performing the first test_and_set. This allows UBSAN to test that clear doesn't read an invalid value. * Fix std/experimental/algorithms/alg.random.sample/sample.pass.cpp The tests were dereferencing a past-the-end pointer to an array so that they could do pointer arithmetic with it. Instead of dereference the iterator I changed the tests to use the special 'base()' test iterator method. * Add -fno-sanitize=float-divide-by-zero to suppress division by zero UBSAN diagnostics. The tests that cause float division by zero are explicitly aware that they are doing that. Since this is well defined for IEEE floats suppress the warnings for now. llvm-svn: 273107
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@ -11,6 +11,7 @@
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#include "algorithm"
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#include "climits"
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#include "cstring"
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#include "__debug"
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_LIBCPP_BEGIN_NAMESPACE_STD
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@ -167,7 +168,10 @@ strstreambuf::overflow(int_type __c)
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buf = new char[new_size];
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if (buf == nullptr)
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return int_type(EOF);
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memcpy(buf, eback(), static_cast<size_t>(old_size));
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if (old_size != 0) {
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_LIBCPP_ASSERT(eback(), "overflow copying from NULL");
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memcpy(buf, eback(), static_cast<size_t>(old_size));
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}
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ptrdiff_t ninp = gptr() - eback();
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ptrdiff_t einp = egptr() - eback();
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ptrdiff_t nout = pptr() - pbase();
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@ -620,12 +620,13 @@ class Configuration(object):
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blacklist = os.path.join(self.libcxx_src_root,
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'test/ubsan_blacklist.txt')
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self.cxx.flags += ['-fsanitize=undefined',
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'-fno-sanitize=vptr,function',
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'-fno-sanitize=vptr,function,float-divide-by-zero',
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'-fno-sanitize-recover=all',
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'-fsanitize-blacklist=' + blacklist]
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self.cxx.compile_flags += ['-O3']
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self.env['UBSAN_OPTIONS'] = 'print_stacktrace=1'
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self.config.available_features.add('ubsan')
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self.config.available_features.add('sanitizer-new-delete')
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elif san == 'Thread':
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self.cxx.flags += ['-fsanitize=thread']
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self.config.available_features.add('tsan')
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@ -23,12 +23,14 @@ int main()
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{
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{
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std::atomic_flag f;
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f.clear();
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f.test_and_set();
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atomic_flag_clear(&f);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.clear();
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f.test_and_set();
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atomic_flag_clear(&f);
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assert(f.test_and_set() == 0);
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@ -22,38 +22,44 @@
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int main()
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{
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{
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std::atomic_flag f;
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f.test_and_set();
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std::atomic_flag f; // uninitialized first
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atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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}
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{
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std::atomic_flag f;
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f.test_and_set();
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atomic_flag_clear_explicit(&f, std::memory_order_release);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_release);
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assert(f.test_and_set() == 0);
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}
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{
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std::atomic_flag f;
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f.test_and_set();
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atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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atomic_flag_clear_explicit(&f, std::memory_order_release);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_release);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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atomic_flag_clear_explicit(&f, std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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}
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@ -22,50 +22,58 @@
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int main()
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{
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{
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std::atomic_flag f;
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f.test_and_set();
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std::atomic_flag f; // uninitialized
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f.clear();
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assert(f.test_and_set() == 0);
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f.clear();
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assert(f.test_and_set() == 0);
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}
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{
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std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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}
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{
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std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_release);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_release);
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assert(f.test_and_set() == 0);
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}
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{
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std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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f.clear();
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assert(f.test_and_set() == 0);
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f.clear();
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_relaxed);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_release);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_release);
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assert(f.test_and_set() == 0);
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}
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{
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volatile std::atomic_flag f;
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f.test_and_set();
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f.clear(std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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f.clear(std::memory_order_seq_cst);
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assert(f.test_and_set() == 0);
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}
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@ -64,12 +64,12 @@ void test() {
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end = std::experimental::sample(PopulationIterator(ia),
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PopulationIterator(ia + is),
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SampleIterator(oa), os, g);
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assert(&*end - oa == std::min(os, is));
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assert(end.base() - oa == std::min(os, is));
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assert(std::equal(oa, oa + os, oa1));
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end = std::experimental::sample(PopulationIterator(ia),
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PopulationIterator(ia + is),
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SampleIterator(oa), os, g);
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assert(&*end - oa == std::min(os, is));
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assert(end.base() - oa == std::min(os, is));
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assert(std::equal(oa, oa + os, oa2));
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}
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@ -85,7 +85,7 @@ void test_empty_population() {
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SampleIterator end =
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std::experimental::sample(PopulationIterator(ia), PopulationIterator(ia),
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SampleIterator(oa), os, g);
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assert(&*end == oa);
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assert(end.base() == oa);
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}
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template <template<class> class PopulationIteratorType, class PopulationItem,
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SampleIterator end =
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std::experimental::sample(PopulationIterator(ia), PopulationIterator(ia + is),
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SampleIterator(oa), 0, g);
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assert(&*end == oa);
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assert(end.base() == oa);
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}
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template <template<class> class PopulationIteratorType, class PopulationItem,
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end = std::experimental::sample(PopulationIterator(ia),
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PopulationIterator(ia + is),
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SampleIterator(oa), os, g);
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assert(&*end - oa == std::min(os, is));
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assert(std::equal(oa, &*end, oa1));
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assert(end.base() - oa == std::min(os, is));
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assert(std::equal(oa, end.base(), oa1));
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}
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int main() {
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