1 #include "sanitizer_common/sanitizer_atomic.h" 2 3 #include <stdlib.h> 4 #include <stdint.h> 5 #include <string.h> 6 #include <unistd.h> 7 8 #ifdef KERNEL_USE 9 extern "C" void ubsan_message(const char *msg); 10 static void message(const char *msg) { ubsan_message(msg); } 11 #else 12 static void message(const char *msg) { 13 write(2, msg, strlen(msg)); 14 } 15 #endif 16 17 static const int kMaxCallerPcs = 20; 18 static __sanitizer::atomic_uintptr_t caller_pcs[kMaxCallerPcs]; 19 // Number of elements in caller_pcs. A special value of kMaxCallerPcs + 1 means 20 // that "too many errors" has already been reported. 21 static __sanitizer::atomic_uint32_t caller_pcs_sz; 22 23 __attribute__((noinline)) static bool report_this_error(void *caller_p) { 24 uintptr_t caller = reinterpret_cast<uintptr_t>(caller_p); 25 if (caller == 0) return false; 26 while (true) { 27 unsigned sz = __sanitizer::atomic_load_relaxed(&caller_pcs_sz); 28 if (sz > kMaxCallerPcs) return false; // early exit 29 // when sz==kMaxCallerPcs print "too many errors", but only when cmpxchg 30 // succeeds in order to not print it multiple times. 31 if (sz > 0 && sz < kMaxCallerPcs) { 32 uintptr_t p; 33 for (unsigned i = 0; i < sz; ++i) { 34 p = __sanitizer::atomic_load_relaxed(&caller_pcs[i]); 35 if (p == 0) break; // Concurrent update. 36 if (p == caller) return false; 37 } 38 if (p == 0) continue; // FIXME: yield? 39 } 40 41 if (!__sanitizer::atomic_compare_exchange_strong( 42 &caller_pcs_sz, &sz, sz + 1, __sanitizer::memory_order_seq_cst)) 43 continue; // Concurrent update! Try again from the start. 44 45 if (sz == kMaxCallerPcs) { 46 message("ubsan: too many errors\n"); 47 return false; 48 } 49 __sanitizer::atomic_store_relaxed(&caller_pcs[sz], caller); 50 return true; 51 } 52 } 53 54 #if defined(__ANDROID__) 55 extern "C" __attribute__((weak)) void android_set_abort_message(const char *); 56 static void abort_with_message(const char *msg) { 57 if (&android_set_abort_message) android_set_abort_message(msg); 58 abort(); 59 } 60 #else 61 static void abort_with_message(const char *) { abort(); } 62 #endif 63 64 #if SANITIZER_DEBUG 65 namespace __sanitizer { 66 // The DCHECK macro needs this symbol to be defined. 67 void NORETURN CheckFailed(const char *file, int, const char *cond, u64, u64) { 68 message("Sanitizer CHECK failed: "); 69 message(file); 70 message(":?? : "); // FIXME: Show line number. 71 message(cond); 72 abort(); 73 } 74 } // namespace __sanitizer 75 #endif 76 77 #define INTERFACE extern "C" __attribute__((visibility("default"))) 78 79 // FIXME: add caller pc to the error message (possibly as "ubsan: error-type 80 // @1234ABCD"). 81 #define HANDLER_RECOVER(name, msg) \ 82 INTERFACE void __ubsan_handle_##name##_minimal() { \ 83 if (!report_this_error(__builtin_return_address(0))) return; \ 84 message("ubsan: " msg "\n"); \ 85 } 86 87 #define HANDLER_NORECOVER(name, msg) \ 88 INTERFACE void __ubsan_handle_##name##_minimal_abort() { \ 89 message("ubsan: " msg "\n"); \ 90 abort_with_message("ubsan: " msg); \ 91 } 92 93 #define HANDLER(name, msg) \ 94 HANDLER_RECOVER(name, msg) \ 95 HANDLER_NORECOVER(name, msg) 96 97 HANDLER(type_mismatch, "type-mismatch") 98 HANDLER(alignment_assumption, "alignment-assumption") 99 HANDLER(add_overflow, "add-overflow") 100 HANDLER(sub_overflow, "sub-overflow") 101 HANDLER(mul_overflow, "mul-overflow") 102 HANDLER(negate_overflow, "negate-overflow") 103 HANDLER(divrem_overflow, "divrem-overflow") 104 HANDLER(shift_out_of_bounds, "shift-out-of-bounds") 105 HANDLER(out_of_bounds, "out-of-bounds") 106 HANDLER_RECOVER(builtin_unreachable, "builtin-unreachable") 107 HANDLER_RECOVER(missing_return, "missing-return") 108 HANDLER(vla_bound_not_positive, "vla-bound-not-positive") 109 HANDLER(float_cast_overflow, "float-cast-overflow") 110 HANDLER(load_invalid_value, "load-invalid-value") 111 HANDLER(invalid_builtin, "invalid-builtin") 112 HANDLER(invalid_objc_cast, "invalid-objc-cast") 113 HANDLER(function_type_mismatch, "function-type-mismatch") 114 HANDLER(implicit_conversion, "implicit-conversion") 115 HANDLER(nonnull_arg, "nonnull-arg") 116 HANDLER(nonnull_return, "nonnull-return") 117 HANDLER(nullability_arg, "nullability-arg") 118 HANDLER(nullability_return, "nullability-return") 119 HANDLER(pointer_overflow, "pointer-overflow") 120 HANDLER(cfi_check_fail, "cfi-check-fail") 121