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-rw-r--r--lib/scudo/standalone/report.cpp192
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diff --git a/lib/scudo/standalone/report.cpp b/lib/scudo/standalone/report.cpp
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+//===-- report.cpp ----------------------------------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "report.h"
+
+#include "atomic_helpers.h"
+#include "string_utils.h"
+
+#include <stdarg.h>
+
+namespace scudo {
+
+class ScopedErrorReport {
+public:
+ ScopedErrorReport() : Message(512) { Message.append("Scudo ERROR: "); }
+ void append(const char *Format, ...) {
+ va_list Args;
+ va_start(Args, Format);
+ Message.append(Format, Args);
+ va_end(Args);
+ }
+ NORETURN ~ScopedErrorReport() {
+ outputRaw(Message.data());
+ setAbortMessage(Message.data());
+ die();
+ }
+
+private:
+ ScopedString Message;
+};
+
+INLINE void NORETURN trap() { __builtin_trap(); }
+
+// This could potentially be called recursively if a CHECK fails in the reports.
+void NORETURN reportCheckFailed(const char *File, int Line,
+ const char *Condition, u64 Value1, u64 Value2) {
+ static atomic_u32 NumberOfCalls;
+ if (atomic_fetch_add(&NumberOfCalls, 1, memory_order_relaxed) > 2) {
+ // TODO(kostyak): maybe sleep here?
+ trap();
+ }
+ ScopedErrorReport Report;
+ Report.append("CHECK failed @ %s:%d %s (%llu, %llu)\n", File, Line, Condition,
+ Value1, Value2);
+}
+
+// Generic string fatal error message.
+void NORETURN reportError(const char *Message) {
+ ScopedErrorReport Report;
+ Report.append("%s\n", Message);
+}
+
+void NORETURN reportInvalidFlag(const char *FlagType, const char *Value) {
+ ScopedErrorReport Report;
+ Report.append("invalid value for %s option: '%s'\n", FlagType, Value);
+}
+
+// The checksum of a chunk header is invalid. This could be caused by an
+// {over,under}write of the header, a pointer that is not an actual chunk.
+void NORETURN reportHeaderCorruption(void *Ptr) {
+ ScopedErrorReport Report;
+ Report.append("corrupted chunk header at address %p\n", Ptr);
+}
+
+// Two threads have attempted to modify a chunk header at the same time. This is
+// symptomatic of a race-condition in the application code, or general lack of
+// proper locking.
+void NORETURN reportHeaderRace(void *Ptr) {
+ ScopedErrorReport Report;
+ Report.append("race on chunk header at address %p\n", Ptr);
+}
+
+// The allocator was compiled with parameters that conflict with field size
+// requirements.
+void NORETURN reportSanityCheckError(const char *Field) {
+ ScopedErrorReport Report;
+ Report.append("maximum possible %s doesn't fit in header\n", Field);
+}
+
+// We enforce a maximum alignment, to keep fields smaller and generally prevent
+// integer overflows, or unexpected corner cases.
+void NORETURN reportAlignmentTooBig(uptr Alignment, uptr MaxAlignment) {
+ ScopedErrorReport Report;
+ Report.append("invalid allocation alignment: %zu exceeds maximum supported "
+ "alignment of %zu\n",
+ Alignment, MaxAlignment);
+}
+
+// See above, we also enforce a maximum size.
+void NORETURN reportAllocationSizeTooBig(uptr UserSize, uptr TotalSize,
+ uptr MaxSize) {
+ ScopedErrorReport Report;
+ Report.append("requested allocation size %zu (%zu after adjustments) exceeds "
+ "maximum supported size of %zu\n",
+ UserSize, TotalSize, MaxSize);
+}
+
+void NORETURN reportOutOfMemory(uptr RequestedSize) {
+ ScopedErrorReport Report;
+ Report.append("out of memory trying to allocate %zu bytes\n", RequestedSize);
+}
+
+static const char *stringifyAction(AllocatorAction Action) {
+ switch (Action) {
+ case AllocatorAction::Recycling:
+ return "recycling";
+ case AllocatorAction::Deallocating:
+ return "deallocating";
+ case AllocatorAction::Reallocating:
+ return "reallocating";
+ case AllocatorAction::Sizing:
+ return "sizing";
+ }
+ return "<invalid action>";
+}
+
+// The chunk is not in a state congruent with the operation we want to perform.
+// This is usually the case with a double-free, a realloc of a freed pointer.
+void NORETURN reportInvalidChunkState(AllocatorAction Action, void *Ptr) {
+ ScopedErrorReport Report;
+ Report.append("invalid chunk state when %s address %p\n",
+ stringifyAction(Action), Ptr);
+}
+
+void NORETURN reportMisalignedPointer(AllocatorAction Action, void *Ptr) {
+ ScopedErrorReport Report;
+ Report.append("misaligned pointer when %s address %p\n",
+ stringifyAction(Action), Ptr);
+}
+
+// The deallocation function used is at odds with the one used to allocate the
+// chunk (eg: new[]/delete or malloc/delete, and so on).
+void NORETURN reportDeallocTypeMismatch(AllocatorAction Action, void *Ptr,
+ u8 TypeA, u8 TypeB) {
+ ScopedErrorReport Report;
+ Report.append("allocation type mismatch when %s address %p (%d vs %d)\n",
+ stringifyAction(Action), Ptr, TypeA, TypeB);
+}
+
+// The size specified to the delete operator does not match the one that was
+// passed to new when allocating the chunk.
+void NORETURN reportDeleteSizeMismatch(void *Ptr, uptr Size,
+ uptr ExpectedSize) {
+ ScopedErrorReport Report;
+ Report.append(
+ "invalid sized delete when deallocating address %p (%zu vs %zu)\n", Ptr,
+ Size, ExpectedSize);
+}
+
+void NORETURN reportAlignmentNotPowerOfTwo(uptr Alignment) {
+ ScopedErrorReport Report;
+ Report.append(
+ "invalid allocation alignment: %zu, alignment must be a power of two\n",
+ Alignment);
+}
+
+void NORETURN reportCallocOverflow(uptr Count, uptr Size) {
+ ScopedErrorReport Report;
+ Report.append("calloc parameters overflow: count * size (%zu * %zu) cannot "
+ "be represented with type size_t\n",
+ Count, Size);
+}
+
+void NORETURN reportInvalidPosixMemalignAlignment(uptr Alignment) {
+ ScopedErrorReport Report;
+ Report.append(
+ "invalid alignment requested in posix_memalign: %zu, alignment must be a "
+ "power of two and a multiple of sizeof(void *) == %zu\n",
+ Alignment, sizeof(void *));
+}
+
+void NORETURN reportPvallocOverflow(uptr Size) {
+ ScopedErrorReport Report;
+ Report.append("pvalloc parameters overflow: size %zu rounded up to system "
+ "page size %zu cannot be represented in type size_t\n",
+ Size, getPageSizeCached());
+}
+
+void NORETURN reportInvalidAlignedAllocAlignment(uptr Alignment, uptr Size) {
+ ScopedErrorReport Report;
+ Report.append("invalid alignment requested in aligned_alloc: %zu, alignment "
+ "must be a power of two and the requested size %zu must be a "
+ "multiple of alignment\n",
+ Alignment, Size);
+}
+
+} // namespace scudo