merge(3p/immer): Subtree merge at 'ad3e3556d' as 'third_party/immer' r/1299

Change-Id: I9636a41ad44b4218293833fd3e9456d9b07c731b

1 files changed, 188 insertions, 0 deletions

diff --git a/third_party/immer/test/flex_vector/fuzzed-2.cpp b/third_party/immer/test/flex_vector/fuzzed-2.cpp
new file mode 100644
index 000000000000..ba17c1a620ec
--- /dev/null
+++ b/third_party/immer/test/flex_vector/fuzzed-2.cpp
@@ -0,0 +1,188 @@
+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include "extra/fuzzer/fuzzer_input.hpp"
+#include <array>
+#include <catch.hpp>
+#include <immer/flex_vector.hpp>
+#include <iostream>
+
+#define IMMER_FUZZED_TRACE_ENABLE 0
+
+#if IMMER_FUZZED_TRACE_ENABLE
+#define IMMER_FUZZED_TRACE(...) std::cout << __VA_ARGS__ << std::endl;
+#else
+#define IMMER_FUZZED_TRACE(...)
+#endif
+
+namespace {
+
+template <std::size_t VarCount = 2, unsigned Bits = 2>
+int run_input(const std::uint8_t* data, std::size_t size)
+{
+    using vector_t =
+        immer::flex_vector<int, immer::default_memory_policy, Bits, Bits>;
+    using size_t = std::uint8_t;
+
+    auto vars = std::array<vector_t, VarCount>{};
+
+#if IMMER_FUZZED_TRACE_ENABLE
+    std::cout << "/// new test run" << std::endl;
+    for (auto i = 0u; i < VarCount; ++i)
+        std::cout << "auto var" << i << " = vector_t{};" << std::endl;
+#endif
+
+    auto is_valid_var   = [&](auto idx) { return idx >= 0 && idx < VarCount; };
+    auto is_valid_index = [](auto& v) {
+        return [&](auto idx) { return idx >= 0 && idx < v.size(); };
+    };
+    auto is_valid_size = [](auto& v) {
+        return [&](auto idx) { return idx >= 0 && idx <= v.size(); };
+    };
+    auto can_concat = [](auto&& v1, auto&& v2) {
+        using size_type = decltype(v1.size());
+        return v2.size() < (std::numeric_limits<size_type>::max() - v1.size());
+    };
+    auto can_insert = [](auto&& v1) {
+        using size_type = decltype(v1.size());
+        return v1.size() < std::numeric_limits<size_type>::max();
+    };
+
+    return fuzzer_input{data, size}.run([&](auto& in) {
+        enum ops
+        {
+            op_push_back,
+            op_update,
+            op_take,
+            op_drop,
+            op_concat,
+            op_push_back_move,
+            op_update_move,
+            op_take_move,
+            op_drop_move,
+        };
+        auto src = read<std::uint8_t>(in, is_valid_var);
+        auto dst = read<std::uint8_t>(in, is_valid_var);
+        switch (read<char>(in)) {
+        case op_push_back:
+            if (can_insert(vars[src])) {
+                IMMER_FUZZED_TRACE("var" << +dst << " = var" << +src
+                                         << ".push_back(42);");
+                vars[dst] = vars[src].push_back(42);
+            }
+            break;
+        case op_update: {
+            auto idx = read<size_t>(in, is_valid_index(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = var" << +src << ".update("
+                                     << +idx
+                                     << ", [] (auto x) { return x + 1; });");
+            vars[dst] = vars[src].update(idx, [](auto x) { return x + 1; });
+            break;
+        }
+        case op_take: {
+            auto idx = read<size_t>(in, is_valid_size(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = var" << +src << ".take("
+                                     << +idx << ");");
+            vars[dst] = vars[src].take(idx);
+            break;
+        }
+        case op_drop: {
+            auto idx = read<size_t>(in, is_valid_size(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = var" << +src << ".take("
+                                     << +idx << ");");
+            vars[dst] = vars[src].drop(idx);
+            break;
+        }
+        case op_concat: {
+            auto src2 = read<std::uint8_t>(in, is_valid_var);
+            if (can_concat(vars[src], vars[src2])) {
+                IMMER_FUZZED_TRACE("var" << +dst << " = var" << +src << " + var"
+                                         << +src2 << ";");
+                vars[dst] = vars[src] + vars[src2];
+            }
+            break;
+        }
+        case op_push_back_move: {
+            if (can_insert(vars[src])) {
+                IMMER_FUZZED_TRACE("var" << +dst << " = std::move(var" << +src
+                                         << ").push_back(21);");
+                vars[dst] = std::move(vars[src]).push_back(21);
+            }
+            break;
+        }
+        case op_update_move: {
+            auto idx = read<size_t>(in, is_valid_index(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = std::move(var" << +src
+                                     << ").update(" << +idx
+                                     << ", [] (auto x) { return x + 1; });");
+            vars[dst] =
+                std::move(vars[src]).update(idx, [](auto x) { return x + 1; });
+            break;
+        }
+        case op_take_move: {
+            auto idx = read<size_t>(in, is_valid_size(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = std::move(var" << +src
+                                     << ").take(" << +idx << ");");
+            vars[dst] = std::move(vars[src]).take(idx);
+            break;
+        }
+        case op_drop_move: {
+            auto idx = read<size_t>(in, is_valid_size(vars[src]));
+            IMMER_FUZZED_TRACE("var" << +dst << " = std::move(var" << +src
+                                     << ").drop(" << +idx << ");");
+            vars[dst] = std::move(vars[src]).drop(idx);
+            break;
+        }
+        default:
+            break;
+        };
+        return true;
+    });
+}
+
+} // anonymous namespace
+
+TEST_CASE("bug: use after free on move-take")
+{
+    SECTION("")
+    {
+        using vector_t =
+            immer::flex_vector<int, immer::default_memory_policy, 2, 2>;
+        auto var0 = vector_t{};
+        auto var1 = vector_t{};
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0 + var0;
+        var0      = var0 + var0;
+        var0      = var0 + var0;
+        var0      = var0 + var0;
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var0      = var0.push_back(42);
+        var1      = var0.push_back(42);
+        var0      = std::move(var0).take(68);
+    }
+
+#if __GNUC__ != 9
+    SECTION("")
+    {
+        constexpr std::uint8_t input[] = {
+            0x0, 0x0,  0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1,  0x0,  0x0, 0x0, 0x0,
+            0x0, 0x40, 0x0, 0x0, 0x0, 0x0, 0x4, 0x4, 0x0,  0x0,  0x0, 0x4, 0x0,
+            0x0, 0x0,  0x4, 0x0, 0x0, 0x0, 0x4, 0x0, 0x0,  0x4,  0x0, 0x0, 0x0,
+            0x4, 0x0,  0x0, 0x0, 0x4, 0x0, 0x0, 0x0, 0x4,  0x0,  0x0, 0x0, 0x4,
+            0x0, 0x0,  0x0, 0x1, 0x0, 0x0, 0x0, 0x7, 0x41, 0xb5, 0x0, 0x0,
+        };
+        CHECK(run_input(input, sizeof(input)) == 0);
+    }
+#endif
+}