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121 lines
4.3 KiB
C++
121 lines
4.3 KiB
C++
//===-- ubsan_handlers_cxx.cc ---------------------------------------------===//
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Error logging entry points for the UBSan runtime, which are only used for C++
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// compilations. This file is permitted to use language features which require
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// linking against a C++ ABI library.
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//
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//===----------------------------------------------------------------------===//
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#include "ubsan_platform.h"
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#if CAN_SANITIZE_UB
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#include "ubsan_handlers_cxx.h"
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#include "ubsan_diag.h"
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#include "ubsan_type_hash.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_suppressions.h"
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using namespace __sanitizer;
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using namespace __ubsan;
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namespace __ubsan {
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extern const char *TypeCheckKinds[];
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}
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static void HandleDynamicTypeCacheMiss(
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DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash,
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ReportOptions Opts) {
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if (checkDynamicType((void*)Pointer, Data->TypeInfo, Hash))
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// Just a cache miss. The type matches after all.
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return;
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// Check if error report should be suppressed.
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DynamicTypeInfo DTI = getDynamicTypeInfoFromObject((void*)Pointer);
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if (DTI.isValid() && IsVptrCheckSuppressed(DTI.getMostDerivedTypeName()))
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return;
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SourceLocation Loc = Data->Loc.acquire();
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if (Loc.isDisabled())
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return;
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ScopedReport R(Opts, Loc, ErrorType::DynamicTypeMismatch);
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Diag(Loc, DL_Error,
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"%0 address %1 which does not point to an object of type %2")
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<< TypeCheckKinds[Data->TypeCheckKind] << (void*)Pointer << Data->Type;
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// If possible, say what type it actually points to.
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if (!DTI.isValid())
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Diag(Pointer, DL_Note, "object has invalid vptr")
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<< TypeName(DTI.getMostDerivedTypeName())
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<< Range(Pointer, Pointer + sizeof(uptr), "invalid vptr");
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else if (!DTI.getOffset())
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Diag(Pointer, DL_Note, "object is of type %0")
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<< TypeName(DTI.getMostDerivedTypeName())
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<< Range(Pointer, Pointer + sizeof(uptr), "vptr for %0");
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else
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// FIXME: Find the type at the specified offset, and include that
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// in the note.
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Diag(Pointer - DTI.getOffset(), DL_Note,
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"object is base class subobject at offset %0 within object of type %1")
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<< DTI.getOffset() << TypeName(DTI.getMostDerivedTypeName())
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<< TypeName(DTI.getSubobjectTypeName())
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<< Range(Pointer, Pointer + sizeof(uptr),
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"vptr for %2 base class of %1");
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}
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void __ubsan::__ubsan_handle_dynamic_type_cache_miss(
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DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
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GET_REPORT_OPTIONS(false);
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HandleDynamicTypeCacheMiss(Data, Pointer, Hash, Opts);
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}
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void __ubsan::__ubsan_handle_dynamic_type_cache_miss_abort(
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DynamicTypeCacheMissData *Data, ValueHandle Pointer, ValueHandle Hash) {
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GET_REPORT_OPTIONS(true);
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HandleDynamicTypeCacheMiss(Data, Pointer, Hash, Opts);
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}
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static void HandleCFIBadType(CFIBadTypeData *Data, ValueHandle Vtable,
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ReportOptions Opts) {
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SourceLocation Loc = Data->Loc.acquire();
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ScopedReport R(Opts, Loc, ErrorType::CFIBadType);
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DynamicTypeInfo DTI = getDynamicTypeInfoFromVtable((void*)Vtable);
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static const char *TypeCheckKinds[] = {
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"virtual call",
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"non-virtual call",
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"base-to-derived cast",
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"cast to unrelated type",
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};
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Diag(Loc, DL_Error, "control flow integrity check for type %0 failed during "
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"%1 (vtable address %2)")
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<< Data->Type << TypeCheckKinds[Data->TypeCheckKind] << (void *)Vtable;
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// If possible, say what type it actually points to.
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if (!DTI.isValid())
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Diag(Vtable, DL_Note, "invalid vtable");
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else
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Diag(Vtable, DL_Note, "vtable is of type %0")
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<< TypeName(DTI.getMostDerivedTypeName());
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}
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void __ubsan::__ubsan_handle_cfi_bad_type(CFIBadTypeData *Data,
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ValueHandle Vtable) {
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GET_REPORT_OPTIONS(false);
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HandleCFIBadType(Data, Vtable, Opts);
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}
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void __ubsan::__ubsan_handle_cfi_bad_type_abort(CFIBadTypeData *Data,
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ValueHandle Vtable) {
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GET_REPORT_OPTIONS(true);
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HandleCFIBadType(Data, Vtable, Opts);
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}
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#endif // CAN_SANITIZE_UB
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