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| author | Louis Dionne <ldionne.2@gmail.com> | 2023-03-28 13:10:25 -0400 |
|---|---|---|
| committer | Louis Dionne <ldionne.2@gmail.com> | 2023-05-09 09:05:29 -0400 |
| commit | 36d8b449cfc9850513bb2ed6c07b5b8cc9f1ae3a (patch) | |
| tree | fed70d16e5c7b3b8a394eae0036d106289e4f182 /libcxx/test | |
| parent | 28bdff19e3ad981ef83e372e8c301f1407b82135 (diff) | |
| download | llvm-36d8b449cfc9850513bb2ed6c07b5b8cc9f1ae3a.tar.gz | |
[libc++] Add assertions for potential OOB reads in std::sort
We introduced an optimization to std::sort in 4eddbf9f10a6. However,
that optimization led to issues where users that were passing invalid
comparators to std::sort could start seeing OOB reads. This led to
the revert of the std::sort optimization from the LLVM 16 release
(see https://llvm.org/D146421).
This patch introduces _LIBCPP_ASSERTs to the places in the algorithm
where we make an assumption that the comparator will be consistent and
hence avoid a bounds check based on that. If the comparator happens not
to be consistent with itself, these are the places where we would
incorrectly go out of bounds. This allows users that enable libc++
assertions to catch such misuse at the cost of basically a bounds
check. For users that do not enable libc++ assertions (which is 99.9%
of users since assertions are off by default), this is basically a
no-op, and in fact the assertion will turn into a __builtin_assume,
making it explicit to the compiler that it can rely on the fact that
we're not going out of bounds.
I think this patch strikes the right balance. Folks that want absolute
performance will get what they want, since it is a precondition for the
comparator to be consistent, so the bounds checks are technically not
mandatory. Folks who want more safety *already* need to be enabling
libc++ assertions to catch other types of bugs (like operator[] OOB),
so this solution should also work for them.
I do think we have a lot of work towards popularizing the use of libc++
assertions and integrating it better so that users don't have to know
about the obscure _LIBCPP_ENABLE_ASSERTIONS macro to enable them, but
that's a separate concern.
rdar://106897934
Differential Revision: https://reviews.llvm.org/D147089
Diffstat (limited to 'libcxx/test')
3 files changed, 3635 insertions, 2 deletions
diff --git a/libcxx/test/libcxx/algorithms/alg.sorting/assert.sort.invalid_comparator.pass.cpp b/libcxx/test/libcxx/algorithms/alg.sorting/assert.sort.invalid_comparator.pass.cpp new file mode 100644 index 000000000000..570a6e1d1e5e --- /dev/null +++ b/libcxx/test/libcxx/algorithms/alg.sorting/assert.sort.invalid_comparator.pass.cpp @@ -0,0 +1,152 @@ +//===----------------------------------------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +// REQUIRES: stdlib=libc++ + +// REQUIRES: has-unix-headers +// UNSUPPORTED: c++03, c++11, c++14, c++17 +// XFAIL: availability-verbose_abort-missing +// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1 + +// This test uses a specific combination of an invalid comparator and sequence of values to +// ensure that our sorting functions do not go out-of-bounds in that case. Instead, we should +// fail loud with an assertion. The specific issue we're looking for here is when the comparator +// does not satisfy the following property: +// +// comp(a, b) implies that !comp(b, a) +// +// In other words, +// +// a < b implies that !(b < a) +// +// If this is not satisfied, we have seen issues in the past where the std::sort implementation +// would proceed to do OOB reads. + +// When the debug mode is enabled, this test fails because we actually catch that the comparator +// is not a strict-weak ordering before we catch that we'd dereference out-of-bounds inside std::sort, +// which leads to different errors than the ones tested below. +// XFAIL: libcpp-has-debug-mode + +#include <algorithm> +#include <cassert> +#include <cstddef> +#include <map> +#include <memory> +#include <ranges> +#include <set> +#include <string> +#include <vector> + +#include "check_assertion.h" + +std::string DATA = +# include "bad_comparator_values.dat" +; + +int main(int, char**) { + std::map<std::size_t, std::map<std::size_t, bool>> comparison_results; // terrible for performance, but really convenient + for (auto line : std::views::split(DATA, '\n') | std::views::filter([](auto const& line) { return !line.empty(); })) { + auto values = std::views::split(line, ' '); + auto it = values.begin(); + std::size_t left = std::stol(std::string((*it).data(), (*it).size())); + it = std::next(it); + std::size_t right = std::stol(std::string((*it).data(), (*it).size())); + it = std::next(it); + bool result = static_cast<bool>(std::stol(std::string((*it).data(), (*it).size()))); + comparison_results[left][right] = result; + } + auto predicate = [&](std::size_t* left, std::size_t* right) { + assert(left != nullptr && right != nullptr && "something is wrong with the test"); + assert(comparison_results.contains(*left) && comparison_results[*left].contains(*right) && "malformed input data?"); + return comparison_results[*left][*right]; + }; + + std::vector<std::unique_ptr<std::size_t>> elements; + std::set<std::size_t*> valid_ptrs; + for (std::size_t i = 0; i != comparison_results.size(); ++i) { + elements.push_back(std::make_unique<std::size_t>(i)); + valid_ptrs.insert(elements.back().get()); + } + + auto checked_predicate = [&](size_t* left, size_t* right) { + // If the pointers passed to the comparator are not in the set of pointers we + // set up above, then we're being passed garbage values from the algorithm + // because we're reading OOB. + assert(valid_ptrs.contains(left)); + assert(valid_ptrs.contains(right)); + return predicate(left, right); + }; + + // Check the classic sorting algorithms + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + TEST_LIBCPP_ASSERT_FAILURE(std::sort(copy.begin(), copy.end(), checked_predicate), "Would read out of bounds"); + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::stable_sort(copy.begin(), copy.end(), checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::partial_sort(copy.begin(), copy.begin(), copy.end(), checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::vector<std::size_t*> results(copy.size(), nullptr); + std::partial_sort_copy(copy.begin(), copy.end(), results.begin(), results.end(), checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::nth_element(copy.begin(), copy.end(), copy.end(), checked_predicate); // doesn't go OOB even with invalid comparator + } + + // Check the Ranges sorting algorithms + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + TEST_LIBCPP_ASSERT_FAILURE(std::ranges::sort(copy, checked_predicate), "Would read out of bounds"); + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::ranges::stable_sort(copy, checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::ranges::partial_sort(copy, copy.begin(), checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::vector<std::size_t*> results(copy.size(), nullptr); + std::ranges::partial_sort_copy(copy, results, checked_predicate); // doesn't go OOB even with invalid comparator + } + { + std::vector<std::size_t*> copy; + for (auto const& e : elements) + copy.push_back(e.get()); + std::ranges::nth_element(copy, copy.end(), checked_predicate); // doesn't go OOB even with invalid comparator + } + + return 0; +} diff --git a/libcxx/test/libcxx/algorithms/alg.sorting/bad_comparator_values.dat b/libcxx/test/libcxx/algorithms/alg.sorting/bad_comparator_values.dat new file mode 100644 index 000000000000..05a4b21d2db9 --- /dev/null +++ b/libcxx/test/libcxx/algorithms/alg.sorting/bad_comparator_values.dat @@ -0,0 +1,3483 @@ +R"( +0 0 0 +0 1 1 +0 2 1 +0 3 1 +0 4 1 +0 5 1 +0 6 1 +0 7 1 +0 8 1 +0 9 1 +0 10 1 +0 11 1 +0 12 1 +0 13 1 +0 14 1 +0 15 1 +0 16 1 +0 17 1 +0 18 1 +0 19 1 +0 20 1 +0 21 1 +0 22 1 +0 23 1 +0 24 1 +0 25 1 +0 26 1 +0 27 1 +0 28 1 +0 29 1 +0 30 1 +0 31 1 +0 32 1 +0 33 1 +0 34 1 +0 35 1 +0 36 1 +0 37 1 +0 38 1 +0 39 1 +0 40 1 +0 41 1 +0 42 1 +0 43 1 +0 44 1 +0 45 1 +0 46 1 +0 47 1 +0 48 1 +0 49 1 +0 50 1 +0 51 1 +0 52 1 +0 53 1 +0 54 1 +0 55 1 +0 56 1 +0 57 1 +0 58 1 +1 0 0 +1 1 0 +1 2 1 +1 3 1 +1 4 1 +1 5 1 +1 6 1 +1 7 1 +1 8 1 +1 9 1 +1 10 1 +1 11 1 +1 12 1 +1 13 1 +1 14 1 +1 15 1 +1 16 1 +1 17 1 +1 18 1 +1 19 1 +1 20 1 +1 21 1 +1 22 1 +1 23 1 +1 24 1 +1 25 1 +1 26 1 +1 27 1 +1 28 1 +1 29 1 +1 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This has to stay synchronized with // how we format assertions in the library. va_list list; |