| 1 | // RUN: %clangxx -O2 %s -o %t && %run %t 2>&1 | FileCheck %s |
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| 2 | |
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| 3 | // Malloc/free hooks are not supported on Windows. |
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| 4 | // XFAIL: target={{.*windows-msvc.*}} |
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| 5 | |
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| 6 | // Must not be implemented, no other reason to install interceptors. |
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| 7 | // XFAIL: ubsan |
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| 8 | |
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| 9 | #include <stdlib.h> |
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| 10 | #include <unistd.h> |
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| 11 | #include <sanitizer/allocator_interface.h> |
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| 12 | |
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| 13 | extern "C" { |
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| 14 | const volatile void *global_ptr; |
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| 15 | |
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| 16 | #define WRITE(s) write(1, s, sizeof(s)) |
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| 17 | |
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| 18 | // Note: avoid calling functions that allocate memory in malloc/free |
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| 19 | // to avoid infinite recursion. |
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| 20 | void __sanitizer_malloc_hook(const volatile void *ptr, size_t sz) { |
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| 21 | if (__sanitizer_get_ownership(p: ptr) && sz == sizeof(int)) { |
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| 22 | WRITE("MallocHook\n" ); |
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| 23 | global_ptr = ptr; |
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| 24 | } |
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| 25 | } |
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| 26 | void __sanitizer_free_hook(const volatile void *ptr) { |
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| 27 | if (__sanitizer_get_ownership(p: ptr) && ptr == global_ptr) |
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| 28 | WRITE("FreeHook\n" ); |
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| 29 | } |
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| 30 | } // extern "C" |
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| 31 | |
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| 32 | volatile int *x; |
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| 33 | |
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| 34 | void MallocHook1(const volatile void *ptr, size_t sz) { WRITE("MH1\n" ); } |
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| 35 | void MallocHook2(const volatile void *ptr, size_t sz) { WRITE("MH2\n" ); } |
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| 36 | void FreeHook1(const volatile void *ptr) { WRITE("FH1\n" ); } |
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| 37 | void FreeHook2(const volatile void *ptr) { WRITE("FH2\n" ); } |
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| 38 | // Call this function with uninitialized arguments to poison |
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| 39 | // TLS shadow for function parameters before calling operator |
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| 40 | // new and, eventually, user-provided hook. |
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| 41 | __attribute__((noinline)) void allocate(int *unused1, int *unused2) { |
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| 42 | x = reinterpret_cast<int *>(malloc(size: sizeof(int))); |
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| 43 | } |
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| 44 | |
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| 45 | int main() { |
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| 46 | __sanitizer_install_malloc_and_free_hooks(malloc_hook: MallocHook1, free_hook: FreeHook1); |
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| 47 | __sanitizer_install_malloc_and_free_hooks(malloc_hook: MallocHook2, free_hook: FreeHook2); |
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| 48 | int *undef1, *undef2; |
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| 49 | allocate(unused1: undef1, unused2: undef2); |
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| 50 | // CHECK: MallocHook |
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| 51 | // CHECK: MH1 |
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| 52 | // CHECK: MH2 |
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| 53 | // Check that malloc hook was called with correct argument. |
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| 54 | if (global_ptr != (void*)x) { |
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| 55 | _exit(status: 1); |
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| 56 | } |
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| 57 | |
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| 58 | // Check that realloc invokes hooks |
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| 59 | // We realloc to 128 here to avoid potential oversizing by allocators |
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| 60 | // making this a no-op. |
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| 61 | x = reinterpret_cast<int *>(realloc(ptr: (int *)x, size: sizeof(int) * 128)); |
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| 62 | // CHECK-DAG: FreeHook{{[[:space:]].*}}FH1{{[[:space:]].*}}FH2 |
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| 63 | // CHECK-DAG: MH1{{[[:space:]].*}}MH2 |
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| 64 | |
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| 65 | x[0] = 0; |
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| 66 | x[127] = -1; |
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| 67 | free(ptr: (void *)x); |
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| 68 | // CHECK: FH1 |
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| 69 | // CHECK: FH2 |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |
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