forked from OSchip/llvm-project
324 lines
9.7 KiB
C++
324 lines
9.7 KiB
C++
//===-- ubsan_diag.cc -----------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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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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// Diagnostic reporting for the UBSan runtime.
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//
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//===----------------------------------------------------------------------===//
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#include "ubsan_diag.h"
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#include "ubsan_init.h"
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#include "ubsan_flags.h"
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#include "sanitizer_common/sanitizer_report_decorator.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "sanitizer_common/sanitizer_symbolizer.h"
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#include <stdio.h>
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using namespace __ubsan;
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static void MaybePrintStackTrace(uptr pc, uptr bp) {
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// We assume that flags are already parsed: InitIfNecessary
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// will definitely be called when we print the first diagnostics message.
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if (!flags()->print_stacktrace)
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return;
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// We can only use slow unwind, as we don't have any information about stack
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// top/bottom.
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// FIXME: It's better to respect "fast_unwind_on_fatal" runtime flag and
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// fetch stack top/bottom information if we have it (e.g. if we're running
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// under ASan).
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if (StackTrace::WillUseFastUnwind(false))
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return;
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StackTrace stack;
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stack.Unwind(kStackTraceMax, pc, bp, 0, 0, 0, false);
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stack.Print();
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}
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namespace {
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class Decorator : public SanitizerCommonDecorator {
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public:
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Decorator() : SanitizerCommonDecorator() {}
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const char *Highlight() const { return Green(); }
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const char *EndHighlight() const { return Default(); }
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const char *Note() const { return Black(); }
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const char *EndNote() const { return Default(); }
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};
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}
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Location __ubsan::getCallerLocation(uptr CallerLoc) {
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if (!CallerLoc)
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return Location();
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uptr Loc = StackTrace::GetPreviousInstructionPc(CallerLoc);
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return getFunctionLocation(Loc, 0);
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}
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Location __ubsan::getFunctionLocation(uptr Loc, const char **FName) {
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if (!Loc)
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return Location();
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InitIfNecessary();
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AddressInfo Info;
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if (!Symbolizer::Get()->SymbolizePC(Loc, &Info, 1) || !Info.module ||
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!*Info.module)
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return Location(Loc);
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if (FName && Info.function)
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*FName = Info.function;
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if (!Info.file)
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return ModuleLocation(Info.module, Info.module_offset);
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return SourceLocation(Info.file, Info.line, Info.column);
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}
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Diag &Diag::operator<<(const TypeDescriptor &V) {
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return AddArg(V.getTypeName());
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}
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Diag &Diag::operator<<(const Value &V) {
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if (V.getType().isSignedIntegerTy())
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AddArg(V.getSIntValue());
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else if (V.getType().isUnsignedIntegerTy())
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AddArg(V.getUIntValue());
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else if (V.getType().isFloatTy())
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AddArg(V.getFloatValue());
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else
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AddArg("<unknown>");
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return *this;
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}
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/// Hexadecimal printing for numbers too large for Printf to handle directly.
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static void PrintHex(UIntMax Val) {
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#if HAVE_INT128_T
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Printf("0x%08x%08x%08x%08x",
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(unsigned int)(Val >> 96),
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(unsigned int)(Val >> 64),
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(unsigned int)(Val >> 32),
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(unsigned int)(Val));
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#else
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UNREACHABLE("long long smaller than 64 bits?");
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#endif
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}
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static void renderLocation(Location Loc) {
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InternalScopedString LocBuffer(1024);
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switch (Loc.getKind()) {
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case Location::LK_Source: {
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SourceLocation SLoc = Loc.getSourceLocation();
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if (SLoc.isInvalid())
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LocBuffer.append("<unknown>");
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else
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PrintSourceLocation(&LocBuffer, SLoc.getFilename(), SLoc.getLine(),
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SLoc.getColumn());
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break;
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}
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case Location::LK_Module:
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PrintModuleAndOffset(&LocBuffer, Loc.getModuleLocation().getModuleName(),
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Loc.getModuleLocation().getOffset());
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break;
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case Location::LK_Memory:
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LocBuffer.append("%p", Loc.getMemoryLocation());
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break;
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case Location::LK_Null:
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LocBuffer.append("<unknown>");
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break;
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}
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Printf("%s:", LocBuffer.data());
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}
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static void renderText(const char *Message, const Diag::Arg *Args) {
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for (const char *Msg = Message; *Msg; ++Msg) {
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if (*Msg != '%') {
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char Buffer[64];
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unsigned I;
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for (I = 0; Msg[I] && Msg[I] != '%' && I != 63; ++I)
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Buffer[I] = Msg[I];
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Buffer[I] = '\0';
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Printf(Buffer);
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Msg += I - 1;
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} else {
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const Diag::Arg &A = Args[*++Msg - '0'];
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switch (A.Kind) {
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case Diag::AK_String:
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Printf("%s", A.String);
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break;
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case Diag::AK_Mangled: {
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Printf("'%s'", Symbolizer::Get()->Demangle(A.String));
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break;
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}
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case Diag::AK_SInt:
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// 'long long' is guaranteed to be at least 64 bits wide.
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if (A.SInt >= INT64_MIN && A.SInt <= INT64_MAX)
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Printf("%lld", (long long)A.SInt);
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else
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PrintHex(A.SInt);
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break;
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case Diag::AK_UInt:
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if (A.UInt <= UINT64_MAX)
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Printf("%llu", (unsigned long long)A.UInt);
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else
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PrintHex(A.UInt);
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break;
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case Diag::AK_Float: {
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// FIXME: Support floating-point formatting in sanitizer_common's
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// printf, and stop using snprintf here.
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char Buffer[32];
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snprintf(Buffer, sizeof(Buffer), "%Lg", (long double)A.Float);
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Printf("%s", Buffer);
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break;
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}
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case Diag::AK_Pointer:
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Printf("%p", A.Pointer);
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break;
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}
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}
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}
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}
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/// Find the earliest-starting range in Ranges which ends after Loc.
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static Range *upperBound(MemoryLocation Loc, Range *Ranges,
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unsigned NumRanges) {
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Range *Best = 0;
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for (unsigned I = 0; I != NumRanges; ++I)
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if (Ranges[I].getEnd().getMemoryLocation() > Loc &&
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(!Best ||
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Best->getStart().getMemoryLocation() >
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Ranges[I].getStart().getMemoryLocation()))
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Best = &Ranges[I];
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return Best;
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}
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/// Render a snippet of the address space near a location.
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static void renderMemorySnippet(const Decorator &Decor, MemoryLocation Loc,
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Range *Ranges, unsigned NumRanges,
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const Diag::Arg *Args) {
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const unsigned BytesToShow = 32;
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const unsigned MinBytesNearLoc = 4;
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// Show at least the 8 bytes surrounding Loc.
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MemoryLocation Min = Loc - MinBytesNearLoc, Max = Loc + MinBytesNearLoc;
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for (unsigned I = 0; I < NumRanges; ++I) {
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Min = __sanitizer::Min(Ranges[I].getStart().getMemoryLocation(), Min);
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Max = __sanitizer::Max(Ranges[I].getEnd().getMemoryLocation(), Max);
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}
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// If we have too many interesting bytes, prefer to show bytes after Loc.
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if (Max - Min > BytesToShow)
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Min = __sanitizer::Min(Max - BytesToShow, Loc - MinBytesNearLoc);
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Max = Min + BytesToShow;
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// Emit data.
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for (uptr P = Min; P != Max; ++P) {
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// FIXME: Check that the address is readable before printing it.
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unsigned char C = *reinterpret_cast<const unsigned char*>(P);
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Printf("%s%02x", (P % 8 == 0) ? " " : " ", C);
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}
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Printf("\n");
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// Emit highlights.
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Printf(Decor.Highlight());
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Range *InRange = upperBound(Min, Ranges, NumRanges);
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for (uptr P = Min; P != Max; ++P) {
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char Pad = ' ', Byte = ' ';
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if (InRange && InRange->getEnd().getMemoryLocation() == P)
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InRange = upperBound(P, Ranges, NumRanges);
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if (!InRange && P > Loc)
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break;
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if (InRange && InRange->getStart().getMemoryLocation() < P)
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Pad = '~';
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if (InRange && InRange->getStart().getMemoryLocation() <= P)
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Byte = '~';
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char Buffer[] = { Pad, Pad, P == Loc ? '^' : Byte, Byte, 0 };
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Printf((P % 8 == 0) ? Buffer : &Buffer[1]);
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}
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Printf("%s\n", Decor.EndHighlight());
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// Go over the line again, and print names for the ranges.
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InRange = 0;
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unsigned Spaces = 0;
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for (uptr P = Min; P != Max; ++P) {
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if (!InRange || InRange->getEnd().getMemoryLocation() == P)
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InRange = upperBound(P, Ranges, NumRanges);
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if (!InRange)
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break;
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Spaces += (P % 8) == 0 ? 2 : 1;
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if (InRange && InRange->getStart().getMemoryLocation() == P) {
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while (Spaces--)
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Printf(" ");
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renderText(InRange->getText(), Args);
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Printf("\n");
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// FIXME: We only support naming one range for now!
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break;
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}
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Spaces += 2;
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}
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// FIXME: Print names for anything we can identify within the line:
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//
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// * If we can identify the memory itself as belonging to a particular
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// global, stack variable, or dynamic allocation, then do so.
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//
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// * If we have a pointer-size, pointer-aligned range highlighted,
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// determine whether the value of that range is a pointer to an
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// entity which we can name, and if so, print that name.
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//
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// This needs an external symbolizer, or (preferably) ASan instrumentation.
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}
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Diag::~Diag() {
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// All diagnostics should be printed under report mutex.
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CommonSanitizerReportMutex.CheckLocked();
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Decorator Decor;
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Printf(Decor.Bold());
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renderLocation(Loc);
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switch (Level) {
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case DL_Error:
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Printf("%s runtime error: %s%s",
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Decor.Warning(), Decor.EndWarning(), Decor.Bold());
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break;
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case DL_Note:
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Printf("%s note: %s", Decor.Note(), Decor.EndNote());
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break;
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}
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renderText(Message, Args);
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Printf("%s\n", Decor.Default());
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if (Loc.isMemoryLocation())
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renderMemorySnippet(Decor, Loc.getMemoryLocation(), Ranges,
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NumRanges, Args);
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}
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ScopedReport::ScopedReport(ReportOptions Opts) : Opts(Opts) {
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InitIfNecessary();
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CommonSanitizerReportMutex.Lock();
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}
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ScopedReport::~ScopedReport() {
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MaybePrintStackTrace(Opts.pc, Opts.bp);
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CommonSanitizerReportMutex.Unlock();
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if (Opts.DieAfterReport)
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Die();
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}
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bool __ubsan::MatchSuppression(const char *Str, SuppressionType Type) {
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Suppression *s;
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// If .preinit_array is not used, it is possible that the UBSan runtime is not
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// initialized.
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if (!SANITIZER_CAN_USE_PREINIT_ARRAY)
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InitIfNecessary();
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return SuppressionContext::Get()->Match(Str, Type, &s);
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}
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