45 lines · cpp
1// REQUIRES: gwp_asan2// RUN: %clangxx_gwp_asan %s -o %t -DTEST_MALLOC3// RUN: %expect_crash %run %t 2>&1 | FileCheck %s --check-prefix CHECK-MALLOC4 5// Check both C++98 and C.6// RUN: %clangxx_gwp_asan -std=c++98 %s -o %t -DTEST_FREE7// RUN: %expect_crash %run %t 2>&1 | FileCheck %s --check-prefix CHECK-FREE8// RUN: cp %s %t.c && %clang_gwp_asan %t.c -o %t -DTEST_FREE9// RUN: %expect_crash %run %t 2>&1 | FileCheck %s --check-prefix CHECK-FREE10 11// Ensure GWP-ASan stub implementation of realloc() in Scudo works to-spec. In12// particular, the behaviour regarding realloc of size zero is interesting, as13// it's defined as free().14 15#include <stdlib.h>16 17int main() {18#if defined(TEST_MALLOC)19 // realloc(nullptr, size) is equivalent to malloc(size).20 char *Ptr = reinterpret_cast<char *>(realloc(nullptr, 1));21 *Ptr = 0;22 // Trigger an INVALID_FREE to the right.23 free(Ptr + 1);24 25 // CHECK-MALLOC: GWP-ASan detected a memory error26 // CHECK-MALLOC: Invalid (Wild) Free at 0x{{[a-f0-9]+}} (1 byte to the right27 // CHECK-MALLOC-SAME: of a 1-byte allocation28#elif defined(TEST_FREE)29 char *Ptr = (char *) malloc(1);30 // realloc(ptr, 0) is equivalent to free(ptr) and must return nullptr. Note31 // that this is only the specification in C++98 and C.32 if (realloc(Ptr, 0) != NULL) {33 34 }35 // Trigger a USE_AFTER_FREE.36 *Ptr = 0;37 38 // CHECK-FREE: GWP-ASan detected a memory error39 // CHECK-FREE: Use After Free at 0x{{[a-f0-9]+}} (0 bytes into a 1-byte40 // CHECK-FREE-SAME: allocation41#endif42 43 return 0;44}45