/* $NetBSD: ubsan.c,v 1.12 2023/12/07 07:10:44 andvar Exp $ */
/*-
* Copyright (c) 2018 The NetBSD Foundation, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* The micro UBSan implementation for the userland (uUBSan) and kernel (kUBSan).
* The uBSSan versions is suitable for inclusion into libc or used standalone
* with ATF tests.
*
* This file due to long symbol names generated by a compiler during the
* instrumentation process does not follow the KNF style with 80-column limit.
*/
#include <sys/cdefs.h>
#if defined(_KERNEL)
__KERNEL_RCSID(0, "$NetBSD: ubsan.c,v 1.12 2023/12/07 07:10:44 andvar Exp $");
#else
__RCSID("$NetBSD: ubsan.c,v 1.12 2023/12/07 07:10:44 andvar Exp $");
#endif
#if defined(_KERNEL)
#include <sys/param.h>
#include <sys/types.h>
#include <sys/stdarg.h>
#define ASSERT(x) KASSERT(x)
#else
#if defined(_LIBC)
#include "namespace.h"
#endif
#include <sys/param.h>
#include <assert.h>
#include <inttypes.h>
#include <math.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#if defined(_LIBC)
#include "extern.h"
#define ubsan_vsyslog vsyslog_ss
#define ASSERT(x) _DIAGASSERT(x)
#else
#define ubsan_vsyslog vsyslog_r
#define ASSERT(x) assert(x)
#endif
/* These macros are available in _KERNEL only */
#define SET(t, f) ((t) |= (f))
#define ISSET(t, f) ((t) & (f))
#define CLR(t, f) ((t) &= ~(f))
#endif
#ifdef UBSAN_ALWAYS_FATAL
static const bool alwaysFatal = true;
#else
static const bool alwaysFatal = false;
#endif
#define REINTERPRET_CAST(__dt, __st) ((__dt)(__st))
#define STATIC_CAST(__dt, __st) ((__dt)(__st))
#define ACK_REPORTED __BIT(31)
#define MUL_STRING "*"
#define PLUS_STRING "+"
#define MINUS_STRING "-"
#define DIVREM_STRING "divrem"
#define CFI_VCALL 0
#define CFI_NVCALL 1
#define CFI_DERIVEDCAST 2
#define CFI_UNRELATEDCAST 3
#define CFI_ICALL 4
#define CFI_NVMFCALL 5
#define CFI_VMFCALL 6
#define NUMBER_MAXLEN 128
#define LOCATION_MAXLEN (PATH_MAX + 32 /* ':LINE:COLUMN' */)
#define WIDTH_8 8
#define WIDTH_16 16
#define WIDTH_32 32
#define WIDTH_64 64
#define WIDTH_80 80
#define WIDTH_96 96
#define WIDTH_128 128
#define NUMBER_SIGNED_BIT 1U
#ifdef __SIZEOF_INT128__
typedef __int128 longest;
typedef unsigned __int128 ulongest;
#else
typedef int64_t longest;
typedef uint64_t ulongest;
#endif
#ifndef _KERNEL
static int ubsan_flags = -1;
#define UBSAN_ABORT __BIT(0)
#define UBSAN_STDOUT __BIT(1)
#define UBSAN_STDERR __BIT(2)
#define UBSAN_SYSLOG __BIT(3)
#endif
/* Undefined Behavior specific defines and structures */
#define KIND_INTEGER 0
#define KIND_FLOAT 1
#define KIND_UNKNOWN UINT16_MAX
struct CSourceLocation {
char *mFilename;
uint32_t mLine;
uint32_t mColumn;
};
struct CTypeDescriptor {
uint16_t mTypeKind;
uint16_t mTypeInfo;
uint8_t mTypeName[1];
};
struct COverflowData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CUnreachableData {
struct CSourceLocation mLocation;
};
struct CCFICheckFailData {
uint8_t mCheckKind;
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CDynamicTypeCacheMissData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
void *mTypeInfo;
uint8_t mTypeCheckKind;
};
struct CFunctionTypeMismatchData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CInvalidBuiltinData {
struct CSourceLocation mLocation;
uint8_t mKind;
};
struct CInvalidValueData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CNonNullArgData {
struct CSourceLocation mLocation;
struct CSourceLocation mAttributeLocation;
int mArgIndex;
};
struct CNonNullReturnData {
struct CSourceLocation mAttributeLocation;
};
struct COutOfBoundsData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mArrayType;
struct CTypeDescriptor *mIndexType;
};
struct CPointerOverflowData {
struct CSourceLocation mLocation;
};
struct CShiftOutOfBoundsData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mLHSType;
struct CTypeDescriptor *mRHSType;
};
struct CTypeMismatchData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
unsigned long mLogAlignment;
uint8_t mTypeCheckKind;
};
struct CTypeMismatchData_v1 {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
uint8_t mLogAlignment;
uint8_t mTypeCheckKind;
};
struct CVLABoundData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mType;
};
struct CFloatCastOverflowData {
struct CSourceLocation mLocation; /* This field exists in this struct since 2015 August 11th */
struct CTypeDescriptor *mFromType;
struct CTypeDescriptor *mToType;
};
struct CImplicitConversionData {
struct CSourceLocation mLocation;
struct CTypeDescriptor *mFromType;
struct CTypeDescriptor *mToType;
uint8_t mKind;
};
struct CAlignmentAssumptionData {
struct CSourceLocation mLocation;
struct CSourceLocation mAssumptionLocation;
struct CTypeDescriptor *mType;
};
/* Local utility functions */
static void Report(bool isFatal, const char *pFormat, ...) __printflike(2, 3);
static bool isAlreadyReported(struct CSourceLocation *pLocation);
static size_t zDeserializeTypeWidth(struct CTypeDescriptor *pType);
static void DeserializeLocation(char *pBuffer, size_t zBUfferLength, struct CSourceLocation *pLocation);
#ifdef __SIZEOF_INT128__
static void DeserializeUINT128(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, __uint128_t U128);
#endif
static void DeserializeNumberSigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, longest L);
static void DeserializeNumberUnsigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, ulongest L);
#ifndef _KERNEL
static void DeserializeFloatOverPointer(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long *pNumber);
static void DeserializeFloatInlined(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
#endif
static longest llliGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
static ulongest llluGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
#ifndef _KERNEL
static void DeserializeNumberFloat(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
#endif
static void DeserializeNumber(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber);
static const char *DeserializeTypeCheckKind(uint8_t hhuTypeCheckKind);
static const char *DeserializeBuiltinCheckKind(uint8_t hhuBuiltinCheckKind);
static const char *DeserializeCFICheckKind(uint8_t hhuCFICheckKind);
static const char *DeserializeImplicitConversionCheckKind(uint8_t hhuImplicitConversionCheckKind);
static bool isNegativeNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber);
static bool isShiftExponentTooLarge(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber, size_t zWidth);
/* Unused in this implementation, emitted by the C++ check dynamic type cast. */
intptr_t __ubsan_vptr_type_cache[128];
/* Public symbols used in the instrumentation of the code generation part */
void __ubsan_handle_add_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_add_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_alignment_assumption(struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset);
void __ubsan_handle_alignment_assumption_abort(struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset);
void __ubsan_handle_builtin_unreachable(struct CUnreachableData *pData);
void __ubsan_handle_cfi_bad_type(struct CCFICheckFailData *pData, unsigned long ulVtable, bool bValidVtable, bool FromUnrecoverableHandler, unsigned long ProgramCounter, unsigned long FramePointer);
void __ubsan_handle_cfi_check_fail(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable);
void __ubsan_handle_cfi_check_fail_abort(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable);
void __ubsan_handle_divrem_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_divrem_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_dynamic_type_cache_miss(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
void __ubsan_handle_dynamic_type_cache_miss_abort(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
void __ubsan_handle_float_cast_overflow(struct CFloatCastOverflowData *pData, unsigned long ulFrom);
void __ubsan_handle_float_cast_overflow_abort(struct CFloatCastOverflowData *pData, unsigned long ulFrom);
void __ubsan_handle_function_type_mismatch(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
void __ubsan_handle_function_type_mismatch_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
void __ubsan_handle_function_type_mismatch_v1(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction, unsigned long ulCalleeRTTI, unsigned long ulFnRTTI);
void __ubsan_handle_function_type_mismatch_v1_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction, unsigned long ulCalleeRTTI, unsigned long ulFnRTTI);
void __ubsan_handle_invalid_builtin(struct CInvalidBuiltinData *pData);
void __ubsan_handle_invalid_builtin_abort(struct CInvalidBuiltinData *pData);
void __ubsan_handle_load_invalid_value(struct CInvalidValueData *pData, unsigned long ulVal);
void __ubsan_handle_load_invalid_value_abort(struct CInvalidValueData *pData, unsigned long ulVal);
void __ubsan_handle_missing_return(struct CUnreachableData *pData);
void __ubsan_handle_mul_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_mul_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_negate_overflow(struct COverflowData *pData, unsigned long ulOldVal);
void __ubsan_handle_negate_overflow_abort(struct COverflowData *pData, unsigned long ulOldVal);
void __ubsan_handle_nonnull_arg(struct CNonNullArgData *pData);
void __ubsan_handle_nonnull_arg_abort(struct CNonNullArgData *pData);
void __ubsan_handle_nonnull_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nonnull_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nullability_arg(struct CNonNullArgData *pData);
void __ubsan_handle_nullability_arg_abort(struct CNonNullArgData *pData);
void __ubsan_handle_nullability_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_nullability_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
void __ubsan_handle_out_of_bounds(struct COutOfBoundsData *pData, unsigned long ulIndex);
void __ubsan_handle_out_of_bounds_abort(struct COutOfBoundsData *pData, unsigned long ulIndex);
void __ubsan_handle_pointer_overflow(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
void __ubsan_handle_pointer_overflow_abort(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
void __ubsan_handle_shift_out_of_bounds(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_shift_out_of_bounds_abort(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_sub_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_sub_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS);
void __ubsan_handle_type_mismatch(struct CTypeMismatchData *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_abort(struct CTypeMismatchData *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_v1(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer);
void __ubsan_handle_type_mismatch_v1_abort(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer);
void __ubsan_handle_vla_bound_not_positive(struct CVLABoundData *pData, unsigned long ulBound);
void __ubsan_handle_vla_bound_not_positive_abort(struct CVLABoundData *pData, unsigned long ulBound);
void __ubsan_handle_implicit_conversion(struct CImplicitConversionData *pData, unsigned long ulFrom, unsigned long ulTo);
void __ubsan_handle_implicit_conversion_abort(struct CImplicitConversionData *pData, unsigned long ulFrom, unsigned long ulTo);
void __ubsan_get_current_report_data(const char **ppOutIssueKind, const char **ppOutMessage, const char **ppOutFilename, uint32_t *pOutLine, uint32_t *pOutCol, char **ppOutMemoryAddr);
static void HandleOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS, const char *szOperation);
static void HandleNegateOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulOldValue);
static void HandleBuiltinUnreachable(bool isFatal, struct CUnreachableData *pData);
static void HandleTypeMismatch(bool isFatal, struct CSourceLocation *mLocation, struct CTypeDescriptor *mType, unsigned long mLogAlignment, uint8_t mTypeCheckKind, unsigned long ulPointer);
static void HandleVlaBoundNotPositive(bool isFatal, struct CVLABoundData *pData, unsigned long ulBound);
static void HandleOutOfBounds(bool isFatal, struct COutOfBoundsData *pData, unsigned long ulIndex);
static void HandleShiftOutOfBounds(bool isFatal, struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS);
static void HandleLoadInvalidValue(bool isFatal, struct CInvalidValueData *pData, unsigned long ulValue);
static void HandleInvalidBuiltin(bool isFatal, struct CInvalidBuiltinData *pData);
static void HandleFunctionTypeMismatch(bool isFatal, struct CFunctionTypeMismatchData *pData, unsigned long ulFunction);
static void HandleCFIBadType(bool isFatal, struct CCFICheckFailData *pData, unsigned long ulVtable, bool *bValidVtable, bool *FromUnrecoverableHandler, unsigned long *ProgramCounter, unsigned long *FramePointer);
static void HandleDynamicTypeCacheMiss(bool isFatal, struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash);
static void HandleFloatCastOverflow(bool isFatal, struct CFloatCastOverflowData *pData, unsigned long ulFrom);
static void HandleMissingReturn(bool isFatal, struct CUnreachableData *pData);
static void HandleNonnullArg(bool isFatal, struct CNonNullArgData *pData);
static void HandleNonnullReturn(bool isFatal, struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer);
static void HandlePointerOverflow(bool isFatal, struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult);
static void HandleAlignmentAssumption(bool isFatal, struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset);
static void
HandleOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS, const char *szOperation)
{
char szLocation[LOCATION_MAXLEN];
char szLHS[NUMBER_MAXLEN];
char szRHS[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szLHS, NUMBER_MAXLEN, pData->mType, ulLHS);
DeserializeNumber(szLocation, szRHS, NUMBER_MAXLEN, pData->mType, ulRHS);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s integer overflow: %s %s %s cannot be represented in type %s\n",
szLocation, ISSET(pData->mType->mTypeInfo, NUMBER_SIGNED_BIT) ? "signed" : "unsigned", szLHS, szOperation, szRHS, pData->mType->mTypeName);
}
static void
HandleNegateOverflow(bool isFatal, struct COverflowData *pData, unsigned long ulOldValue)
{
char szLocation[LOCATION_MAXLEN];
char szOldValue[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szOldValue, NUMBER_MAXLEN, pData->mType, ulOldValue);
Report(isFatal, "UBSan: Undefined Behavior in %s, negation of %s cannot be represented in type %s\n",
szLocation, szOldValue, pData->mType->mTypeName);
}
static void
HandleBuiltinUnreachable(bool isFatal, struct CUnreachableData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, calling __builtin_unreachable()\n",
szLocation);
}
static void
HandleTypeMismatch(bool isFatal, struct CSourceLocation *mLocation, struct CTypeDescriptor *mType, unsigned long mLogAlignment, uint8_t mTypeCheckKind, unsigned long ulPointer)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(mLocation);
ASSERT(mType);
if (isAlreadyReported(mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, mLocation);
if (ulPointer == 0) {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s null pointer of type %s\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), mType->mTypeName);
} else if ((mLogAlignment - 1) & ulPointer) {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s misaligned address %p for type %s which requires %ld byte alignment\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), REINTERPRET_CAST(void *, ulPointer), mType->mTypeName, mLogAlignment);
} else {
Report(isFatal, "UBSan: Undefined Behavior in %s, %s address %p with insufficient space for an object of type %s\n",
szLocation, DeserializeTypeCheckKind(mTypeCheckKind), REINTERPRET_CAST(void *, ulPointer), mType->mTypeName);
}
}
static void
HandleVlaBoundNotPositive(bool isFatal, struct CVLABoundData *pData, unsigned long ulBound)
{
char szLocation[LOCATION_MAXLEN];
char szBound[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szBound, NUMBER_MAXLEN, pData->mType, ulBound);
Report(isFatal, "UBSan: Undefined Behavior in %s, variable length array bound value %s <= 0\n",
szLocation, szBound);
}
static void
HandleOutOfBounds(bool isFatal, struct COutOfBoundsData *pData, unsigned long ulIndex)
{
char szLocation[LOCATION_MAXLEN];
char szIndex[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szIndex, NUMBER_MAXLEN, pData->mIndexType, ulIndex);
Report(isFatal, "UBSan: Undefined Behavior in %s, index %s is out of range for type %s\n",
szLocation, szIndex, pData->mArrayType->mTypeName);
}
static void
HandleShiftOutOfBounds(bool isFatal, struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
char szLocation[LOCATION_MAXLEN];
char szLHS[NUMBER_MAXLEN];
char szRHS[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szLHS, NUMBER_MAXLEN, pData->mLHSType, ulLHS);
DeserializeNumber(szLocation, szRHS, NUMBER_MAXLEN, pData->mRHSType, ulRHS);
if (isNegativeNumber(szLocation, pData->mRHSType, ulRHS))
Report(isFatal, "UBSan: Undefined Behavior in %s, shift exponent %s is negative\n",
szLocation, szRHS);
else if (isShiftExponentTooLarge(szLocation, pData->mRHSType, ulRHS, zDeserializeTypeWidth(pData->mLHSType)))
Report(isFatal, "UBSan: Undefined Behavior in %s, shift exponent %s is too large for %zu-bit type %s\n",
szLocation, szRHS, zDeserializeTypeWidth(pData->mLHSType), pData->mLHSType->mTypeName);
else if (isNegativeNumber(szLocation, pData->mLHSType, ulLHS))
Report(isFatal, "UBSan: Undefined Behavior in %s, left shift of negative value %s\n",
szLocation, szLHS);
else
Report(isFatal, "UBSan: Undefined Behavior in %s, left shift of %s by %s places cannot be represented in type %s\n",
szLocation, szLHS, szRHS, pData->mLHSType->mTypeName);
}
static void
HandleLoadInvalidValue(bool isFatal, struct CInvalidValueData *pData, unsigned long ulValue)
{
char szLocation[LOCATION_MAXLEN];
char szValue[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szValue, NUMBER_MAXLEN, pData->mType, ulValue);
Report(isFatal, "UBSan: Undefined Behavior in %s, load of value %s is not a valid value for type %s\n",
szLocation, szValue, pData->mType->mTypeName);
}
static void
HandleInvalidBuiltin(bool isFatal, struct CInvalidBuiltinData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, passing zero to %s, which is not a valid argument\n",
szLocation, DeserializeBuiltinCheckKind(pData->mKind));
}
static void
HandleFunctionTypeMismatch(bool isFatal, struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
char szLocation[LOCATION_MAXLEN];
/*
* There is no a portable C solution to translate an address of a
* function to its name. On the cost of getting this routine simple
* and portable without ifdefs between the userland and the kernel
* just print the address of the function as-is.
*
* For better diagnostic messages in the userland, users shall use
* the full upstream version shipped along with the compiler toolchain.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, call to function %#lx through pointer to incorrect function type %s\n",
szLocation, ulFunction, pData->mType->mTypeName);
}
static void
HandleCFIBadType(bool isFatal, struct CCFICheckFailData *pData, unsigned long ulVtable, bool *bValidVtable, bool *FromUnrecoverableHandler, unsigned long *ProgramCounter, unsigned long *FramePointer)
{
char szLocation[LOCATION_MAXLEN];
/*
* This is a minimal implementation without diving into C++
* specifics and (Itanium) ABI deserialization.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
if (pData->mCheckKind == CFI_ICALL || pData->mCheckKind == CFI_VMFCALL) {
Report(isFatal, "UBSan: Undefined Behavior in %s, control flow integrity check for type %s failed during %s (vtable address %#lx)\n",
szLocation, pData->mType->mTypeName, DeserializeCFICheckKind(pData->mCheckKind), ulVtable);
} else {
Report(isFatal || FromUnrecoverableHandler, "UBSan: Undefined Behavior in %s, control flow integrity check for type %s failed during %s (vtable address %#lx; %s vtable; from %s handler; Program Counter %#lx; Frame Pointer %#lx)\n",
szLocation, pData->mType->mTypeName, DeserializeCFICheckKind(pData->mCheckKind), ulVtable, *bValidVtable ? "valid" : "invalid", *FromUnrecoverableHandler ? "unrecoverable" : "recoverable", *ProgramCounter, *FramePointer);
}
}
static void
HandleDynamicTypeCacheMiss(bool isFatal, struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
#if 0
char szLocation[LOCATION_MAXLEN];
/*
* Unimplemented.
*
* This UBSan handler is special as the check has to be impelemented
* in an implementation. In order to handle it there is need to
* introspect into C++ ABI internals (RTTI) and use low-level
* C++ runtime interfaces.
*/
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s address %#lx which might not point to an object of type %s\n"
szLocation, DeserializeTypeCheckKind(pData->mTypeCheckKind), ulPointer, pData->mType);
#endif
}
static void
HandleFloatCastOverflow(bool isFatal, struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
char szLocation[LOCATION_MAXLEN];
char szFrom[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szFrom, NUMBER_MAXLEN, pData->mFromType, ulFrom);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s (of type %s) is outside the range of representable values of type %s\n",
szLocation, szFrom, pData->mFromType->mTypeName, pData->mToType->mTypeName);
}
static void
HandleMissingReturn(bool isFatal, struct CUnreachableData *pData)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, execution reached the end of a value-returning function without returning a value\n",
szLocation);
}
static void
HandleNonnullArg(bool isFatal, struct CNonNullArgData *pData)
{
char szLocation[LOCATION_MAXLEN];
char szAttributeLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
if (pData->mAttributeLocation.mFilename)
DeserializeLocation(szAttributeLocation, LOCATION_MAXLEN, &pData->mAttributeLocation);
else
szAttributeLocation[0] = '\0';
Report(isFatal, "UBSan: Undefined Behavior in %s, null pointer passed as argument %d, which is declared to never be null%s%s\n",
szLocation, pData->mArgIndex, pData->mAttributeLocation.mFilename ? ", nonnull/_Nonnull specified in " : "", szAttributeLocation);
}
static void
HandleNonnullReturn(bool isFatal, struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
char szLocation[LOCATION_MAXLEN];
char szAttributeLocation[LOCATION_MAXLEN];
ASSERT(pData);
ASSERT(pLocationPointer);
if (isAlreadyReported(pLocationPointer))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, pLocationPointer);
if (pData->mAttributeLocation.mFilename)
DeserializeLocation(szAttributeLocation, LOCATION_MAXLEN, &pData->mAttributeLocation);
else
szAttributeLocation[0] = '\0';
Report(isFatal, "UBSan: Undefined Behavior in %s, null pointer returned from function declared to never return null%s%s\n",
szLocation, pData->mAttributeLocation.mFilename ? ", nonnull/_Nonnull specified in " : "", szAttributeLocation);
}
static void
HandlePointerOverflow(bool isFatal, struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{
char szLocation[LOCATION_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, pointer expression with base %#lx overflowed to %#lx\n",
szLocation, ulBase, ulResult);
}
static void
HandleImplicitConversion(bool isFatal, struct CImplicitConversionData *pData, unsigned long ulFrom, unsigned long ulTo)
{
char szLocation[LOCATION_MAXLEN];
char szFrom[NUMBER_MAXLEN];
char szTo[NUMBER_MAXLEN];
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
DeserializeNumber(szLocation, szFrom, NUMBER_MAXLEN, pData->mFromType, ulFrom);
DeserializeNumber(szLocation, szTo, NUMBER_MAXLEN, pData->mToType, ulTo);
Report(isFatal, "UBSan: Undefined Behavior in %s, %s from %s %zu-bit %s (%s) to %s changed the value to %s %zu-bit %s\n",
szLocation, DeserializeImplicitConversionCheckKind(pData->mKind), szFrom, zDeserializeTypeWidth(pData->mFromType), ISSET(pData->mFromType->mTypeInfo, NUMBER_SIGNED_BIT) ? "signed" : "unsigned", pData->mFromType->mTypeName, pData->mToType->mTypeName, szTo, zDeserializeTypeWidth(pData->mToType), ISSET(pData->mToType->mTypeInfo, NUMBER_SIGNED_BIT) ? "signed" : "unsigned");
}
static void
HandleAlignmentAssumption(bool isFatal, struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset)
{
char szLocation[LOCATION_MAXLEN];
char szAssumptionLocation[LOCATION_MAXLEN];
unsigned long ulRealPointer;
ASSERT(pData);
if (isAlreadyReported(&pData->mLocation))
return;
DeserializeLocation(szLocation, LOCATION_MAXLEN, &pData->mLocation);
ulRealPointer = ulPointer - ulOffset;
if (pData->mAssumptionLocation.mFilename != NULL) {
DeserializeLocation(szAssumptionLocation, LOCATION_MAXLEN,
&pData->mAssumptionLocation);
Report(isFatal, "UBSan: Undefined Behavior in %s, alignment assumption of %#lx for pointer %#lx (offset %#lx), assumption made in %s\n",
szLocation, ulAlignment, ulRealPointer, ulOffset,
szAssumptionLocation);
} else {
Report(isFatal, "UBSan: Undefined Behavior in %s, alignment assumption of %#lx for pointer %#lx (offset %#lx)\n",
szLocation, ulAlignment, ulRealPointer, ulOffset);
}
}
/* Definions of public symbols emitted by the instrumentation code */
void
__ubsan_handle_add_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, PLUS_STRING);
}
void
__ubsan_handle_add_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, PLUS_STRING);
}
void
__ubsan_handle_alignment_assumption(struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset)
{
ASSERT(pData);
HandleAlignmentAssumption(false, pData, ulPointer, ulAlignment, ulOffset);
}
void
__ubsan_handle_alignment_assumption_abort(struct CAlignmentAssumptionData *pData, unsigned long ulPointer, unsigned long ulAlignment, unsigned long ulOffset)
{
ASSERT(pData);
HandleAlignmentAssumption(true, pData, ulPointer, ulAlignment, ulOffset);
}
void
__ubsan_handle_builtin_unreachable(struct CUnreachableData *pData)
{
ASSERT(pData);
HandleBuiltinUnreachable(true, pData);
}
void
__ubsan_handle_cfi_bad_type(struct CCFICheckFailData *pData, unsigned long ulVtable, bool bValidVtable, bool FromUnrecoverableHandler, unsigned long ProgramCounter, unsigned long FramePointer)
{
ASSERT(pData);
HandleCFIBadType(false, pData, ulVtable, &bValidVtable, &FromUnrecoverableHandler, &ProgramCounter, &FramePointer);
}
void
__ubsan_handle_cfi_check_fail(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable)
{
ASSERT(pData);
HandleCFIBadType(false, pData, ulValue, 0, 0, 0, 0);
}
void
__ubsan_handle_cfi_check_fail_abort(struct CCFICheckFailData *pData, unsigned long ulValue, unsigned long ulValidVtable)
{
ASSERT(pData);
HandleCFIBadType(true, pData, ulValue, 0, 0, 0, 0);
}
void
__ubsan_handle_divrem_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, DIVREM_STRING);
}
void
__ubsan_handle_divrem_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, DIVREM_STRING);
}
void
__ubsan_handle_dynamic_type_cache_miss(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
ASSERT(pData);
HandleDynamicTypeCacheMiss(false, pData, ulPointer, ulHash);
}
void
__ubsan_handle_dynamic_type_cache_miss_abort(struct CDynamicTypeCacheMissData *pData, unsigned long ulPointer, unsigned long ulHash)
{
ASSERT(pData);
HandleDynamicTypeCacheMiss(false, pData, ulPointer, ulHash);
}
void
__ubsan_handle_float_cast_overflow(struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
ASSERT(pData);
HandleFloatCastOverflow(false, pData, ulFrom);
}
void
__ubsan_handle_float_cast_overflow_abort(struct CFloatCastOverflowData *pData, unsigned long ulFrom)
{
ASSERT(pData);
HandleFloatCastOverflow(true, pData, ulFrom);
}
void
__ubsan_handle_function_type_mismatch(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
ASSERT(pData);
HandleFunctionTypeMismatch(false, pData, ulFunction);
}
void
__ubsan_handle_function_type_mismatch_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction)
{
ASSERT(pData);
HandleFunctionTypeMismatch(true, pData, ulFunction);
}
void
__ubsan_handle_function_type_mismatch_v1(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction, unsigned long ulCalleeRTTI, unsigned long ulFnRTTI)
{
ASSERT(pData);
#if 0
/*
* Unimplemented.
*
* This UBSan handler is special as the check has to be impelemented
* in an implementation. In order to handle it there is need to
* introspect into C++ ABI internals (RTTI) and use low-level
* C++ runtime interfaces.
*/
HandleFunctionTypeMismatch(false, pData, ulFunction);
#endif
}
void
__ubsan_handle_function_type_mismatch_v1_abort(struct CFunctionTypeMismatchData *pData, unsigned long ulFunction, unsigned long ulCalleeRTTI, unsigned long ulFnRTTI)
{
ASSERT(pData);
#if 0
/*
* Unimplemented.
*
* This UBSan handler is special as the check has to be impelemented
* in an implementation. In order to handle it there is need to
* introspect into C++ ABI internals (RTTI) and use low-level
* C++ runtime interfaces.
*/
HandleFunctionTypeMismatch(true, pData, ulFunction);
#endif
}
void
__ubsan_handle_invalid_builtin(struct CInvalidBuiltinData *pData)
{
ASSERT(pData);
HandleInvalidBuiltin(true, pData);
}
void
__ubsan_handle_invalid_builtin_abort(struct CInvalidBuiltinData *pData)
{
ASSERT(pData);
HandleInvalidBuiltin(true, pData);
}
void
__ubsan_handle_load_invalid_value(struct CInvalidValueData *pData, unsigned long ulValue)
{
ASSERT(pData);
HandleLoadInvalidValue(false, pData, ulValue);
}
void
__ubsan_handle_load_invalid_value_abort(struct CInvalidValueData *pData, unsigned long ulValue)
{
ASSERT(pData);
HandleLoadInvalidValue(true, pData, ulValue);
}
void
__ubsan_handle_missing_return(struct CUnreachableData *pData)
{
ASSERT(pData);
HandleMissingReturn(true, pData);
}
void
__ubsan_handle_mul_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, MUL_STRING);
}
void
__ubsan_handle_mul_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, MUL_STRING);
}
void
__ubsan_handle_negate_overflow(struct COverflowData *pData, unsigned long ulOldValue)
{
ASSERT(pData);
HandleNegateOverflow(false, pData, ulOldValue);
}
void
__ubsan_handle_negate_overflow_abort(struct COverflowData *pData, unsigned long ulOldValue)
{
ASSERT(pData);
HandleNegateOverflow(true, pData, ulOldValue);
}
void
__ubsan_handle_nonnull_arg(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(false, pData);
}
void
__ubsan_handle_nonnull_arg_abort(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(true, pData);
}
void
__ubsan_handle_nonnull_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(false, pData, pLocationPointer);
}
void
__ubsan_handle_nonnull_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(true, pData, pLocationPointer);
}
void
__ubsan_handle_nullability_arg(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(false, pData);
}
void
__ubsan_handle_nullability_arg_abort(struct CNonNullArgData *pData)
{
ASSERT(pData);
HandleNonnullArg(true, pData);
}
void
__ubsan_handle_nullability_return_v1(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(false, pData, pLocationPointer);
}
void
__ubsan_handle_nullability_return_v1_abort(struct CNonNullReturnData *pData, struct CSourceLocation *pLocationPointer)
{
ASSERT(pData);
ASSERT(pLocationPointer);
HandleNonnullReturn(true, pData, pLocationPointer);
}
void
__ubsan_handle_out_of_bounds(struct COutOfBoundsData *pData, unsigned long ulIndex)
{
ASSERT(pData);
HandleOutOfBounds(false, pData, ulIndex);
}
void
__ubsan_handle_out_of_bounds_abort(struct COutOfBoundsData *pData, unsigned long ulIndex)
{
ASSERT(pData);
HandleOutOfBounds(true, pData, ulIndex);
}
void
__ubsan_handle_pointer_overflow(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{
ASSERT(pData);
HandlePointerOverflow(false, pData, ulBase, ulResult);
}
void
__ubsan_handle_pointer_overflow_abort(struct CPointerOverflowData *pData, unsigned long ulBase, unsigned long ulResult)
{
ASSERT(pData);
HandlePointerOverflow(true, pData, ulBase, ulResult);
}
void
__ubsan_handle_shift_out_of_bounds(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleShiftOutOfBounds(false, pData, ulLHS, ulRHS);
}
void
__ubsan_handle_shift_out_of_bounds_abort(struct CShiftOutOfBoundsData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleShiftOutOfBounds(true, pData, ulLHS, ulRHS);
}
void
__ubsan_handle_sub_overflow(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(false, pData, ulLHS, ulRHS, MINUS_STRING);
}
void
__ubsan_handle_sub_overflow_abort(struct COverflowData *pData, unsigned long ulLHS, unsigned long ulRHS)
{
ASSERT(pData);
HandleOverflow(true, pData, ulLHS, ulRHS, MINUS_STRING);
}
void
__ubsan_handle_type_mismatch(struct CTypeMismatchData *pData, unsigned long ulPointer)
{
ASSERT(pData);
HandleTypeMismatch(false, &pData->mLocation, pData->mType, pData->mLogAlignment, pData->mTypeCheckKind, ulPointer);
}
void
__ubsan_handle_type_mismatch_abort(struct CTypeMismatchData *pData, unsigned long ulPointer)
{
ASSERT(pData);
HandleTypeMismatch(true, &pData->mLocation, pData->mType, pData->mLogAlignment, pData->mTypeCheckKind, ulPointer);
}
void
__ubsan_handle_type_mismatch_v1(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer)
{
ASSERT(pData);
HandleTypeMismatch(false, &pData->mLocation, pData->mType, __BIT(pData->mLogAlignment), pData->mTypeCheckKind, ulPointer);
}
void
__ubsan_handle_type_mismatch_v1_abort(struct CTypeMismatchData_v1 *pData, unsigned long ulPointer)
{
ASSERT(pData);
HandleTypeMismatch(true, &pData->mLocation, pData->mType, __BIT(pData->mLogAlignment), pData->mTypeCheckKind, ulPointer);
}
void
__ubsan_handle_vla_bound_not_positive(struct CVLABoundData *pData, unsigned long ulBound)
{
ASSERT(pData);
HandleVlaBoundNotPositive(false, pData, ulBound);
}
void
__ubsan_handle_vla_bound_not_positive_abort(struct CVLABoundData *pData, unsigned long ulBound)
{
ASSERT(pData);
HandleVlaBoundNotPositive(true, pData, ulBound);
}
void
__ubsan_handle_implicit_conversion(struct CImplicitConversionData *pData, unsigned long ulFrom, unsigned long ulTo)
{
ASSERT(pData);
HandleImplicitConversion(false, pData, ulFrom, ulTo);
}
void
__ubsan_handle_implicit_conversion_abort(struct CImplicitConversionData *pData, unsigned long ulFrom, unsigned long ulTo)
{
ASSERT(pData);
HandleImplicitConversion(true, pData, ulFrom, ulTo);
}
void
__ubsan_get_current_report_data(const char **ppOutIssueKind, const char **ppOutMessage, const char **ppOutFilename, uint32_t *pOutLine, uint32_t *pOutCol, char **ppOutMemoryAddr)
{
/*
* Unimplemented.
*
* The __ubsan_on_report() feature is non trivial to implement in a
* shared code between the kernel and userland. It's also opening
* new sets of potential problems as we are not expected to slow down
* execution of certain kernel subsystems (synchronization issues,
* interrupt handling etc).
*
* A proper solution would need probably a lock-free bounded queue built
* with atomic operations with the property of multiple consumers and
* multiple producers. Maintaining and validating such code is not
* worth the effort.
*
* A legitimate user - besides testing framework - is a debugger plugin
* intercepting reports from the UBSan instrumentation. For such
* scenarios it is better to run the Clang/GCC version.
*/
}
/* Local utility functions */
static void
Report(bool isFatal, const char *pFormat, ...)
{
va_list ap;
ASSERT(pFormat);
va_start(ap, pFormat);
#if defined(_KERNEL)
if (isFatal || alwaysFatal)
vpanic(pFormat, ap);
else
vprintf(pFormat, ap);
#else
if (ubsan_flags == -1) {
char buf[1024];
char *p;
ubsan_flags = UBSAN_STDERR;
if (getenv_r("LIBC_UBSAN", buf, sizeof(buf)) != -1) {
for (p = buf; *p; p++) {
switch (*p) {
case 'a':
SET(ubsan_flags, UBSAN_ABORT);
break;
case 'A':
CLR(ubsan_flags, UBSAN_ABORT);
break;
case 'e':
SET(ubsan_flags, UBSAN_STDERR);
break;
case 'E':
CLR(ubsan_flags, UBSAN_STDERR);
break;
case 'l':
SET(ubsan_flags, UBSAN_SYSLOG);
break;
case 'L':
CLR(ubsan_flags, UBSAN_SYSLOG);
break;
case 'o':
SET(ubsan_flags, UBSAN_STDOUT);
break;
case 'O':
CLR(ubsan_flags, UBSAN_STDOUT);
break;
default:
break;
}
}
}
}
// The *v*print* functions can flush the va_list argument.
// Create a local copy for each call to prevent invalid read.
if (ISSET(ubsan_flags, UBSAN_STDOUT)) {
va_list tmp;
va_copy(tmp, ap);
vprintf(pFormat, tmp);
va_end(tmp);
fflush(stdout);
}
if (ISSET(ubsan_flags, UBSAN_STDERR)) {
va_list tmp;
va_copy(tmp, ap);
vfprintf(stderr, pFormat, tmp);
va_end(tmp);
fflush(stderr);
}
if (ISSET(ubsan_flags, UBSAN_SYSLOG)) {
va_list tmp;
va_copy(tmp, ap);
struct syslog_data SyslogData = SYSLOG_DATA_INIT;
ubsan_vsyslog(LOG_DEBUG | LOG_USER, &SyslogData, pFormat, tmp);
va_end(tmp);
}
if (isFatal || alwaysFatal || ISSET(ubsan_flags, UBSAN_ABORT)) {
abort();
__unreachable();
/* NOTREACHED */
}
#endif
va_end(ap);
}
static bool
isAlreadyReported(struct CSourceLocation *pLocation)
{
/*
* This code is shared between libc, kernel and standalone usage.
* It shall work in early bootstrap phase of both of them.
*/
uint32_t siOldValue;
volatile uint32_t *pLine;
ASSERT(pLocation);
pLine = &pLocation->mLine;
do {
siOldValue = *pLine;
} while (__sync_val_compare_and_swap(pLine, siOldValue, siOldValue | ACK_REPORTED) != siOldValue);
return ISSET(siOldValue, ACK_REPORTED);
}
static size_t
zDeserializeTypeWidth(struct CTypeDescriptor *pType)
{
size_t zWidth = 0;
ASSERT(pType);
switch (pType->mTypeKind) {
case KIND_INTEGER:
zWidth = __BIT(__SHIFTOUT(pType->mTypeInfo, ~NUMBER_SIGNED_BIT));
break;
case KIND_FLOAT:
zWidth = pType->mTypeInfo;
break;
default:
Report(true, "UBSan: Unknown variable type %#04" PRIx16 "\n", pType->mTypeKind);
__unreachable();
/* NOTREACHED */
}
/* Invalid width will be transformed to 0 */
ASSERT(zWidth > 0);
return zWidth;
}
static void
DeserializeLocation(char *pBuffer, size_t zBUfferLength, struct CSourceLocation *pLocation)
{
ASSERT(pLocation);
ASSERT(pLocation->mFilename);
snprintf(pBuffer, zBUfferLength, "%s:%" PRIu32 ":%" PRIu32, pLocation->mFilename, pLocation->mLine & (uint32_t)~ACK_REPORTED, pLocation->mColumn);
}
#ifdef __SIZEOF_INT128__
static void
DeserializeUINT128(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, __uint128_t U128)
{
char szBuf[3]; /* 'XX\0' */
char rgNumber[sizeof(ulongest)];
ssize_t zI;
memcpy(rgNumber, &U128, sizeof(U128));
strlcpy(pBuffer, "Undecoded-128-bit-Integer-Type (0x", zBUfferLength);
#if BYTE_ORDER == LITTLE_ENDIAN
for (zI = sizeof(ulongest) - 1; zI >= 0; zI--) {
#else
for (zI = 0; zI < (ssize_t)sizeof(ulongest); zI++) {
#endif
snprintf(szBuf, sizeof(szBuf), "%02" PRIx8, rgNumber[zI]);
strlcat(pBuffer, szBuf, zBUfferLength);
}
strlcat(pBuffer, ")", zBUfferLength);
}
#endif
static void
DeserializeNumberSigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, longest L)
{
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
ASSERT(ISSET(pType->mTypeInfo, NUMBER_SIGNED_BIT));
switch (zDeserializeTypeWidth(pType)) {
default:
ASSERT(0 && "Invalid codepath");
__unreachable();
/* NOTREACHED */
#ifdef __SIZEOF_INT128__
case WIDTH_128:
DeserializeUINT128(pBuffer, zBUfferLength, pType, STATIC_CAST(__uint128_t, L));
break;
#endif
case WIDTH_64:
/* FALLTHROUGH */
case WIDTH_32:
/* FALLTHROUGH */
case WIDTH_16:
/* FALLTHROUGH */
case WIDTH_8:
snprintf(pBuffer, zBUfferLength, "%" PRId64, STATIC_CAST(int64_t, L));
break;
}
}
static void
DeserializeNumberUnsigned(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, ulongest L)
{
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
ASSERT(!ISSET(pType->mTypeInfo, NUMBER_SIGNED_BIT));
switch (zDeserializeTypeWidth(pType)) {
default:
ASSERT(0 && "Invalid codepath");
__unreachable();
/* NOTREACHED */
#ifdef __SIZEOF_INT128__
case WIDTH_128:
DeserializeUINT128(pBuffer, zBUfferLength, pType, STATIC_CAST(__uint128_t, L));
break;
#endif
case WIDTH_64:
/* FALLTHROUGH */
case WIDTH_32:
/* FALLTHROUGH */
case WIDTH_16:
/* FALLTHROUGH */
case WIDTH_8:
snprintf(pBuffer, zBUfferLength, "%" PRIu64, STATIC_CAST(uint64_t, L));
break;
}
}
#ifndef _KERNEL
static void
DeserializeFloatOverPointer(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long *pNumber)
{
double D;
#ifdef __HAVE_LONG_DOUBLE
long double LD;
#endif
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
ASSERT(pNumber);
/*
* This function handles 64-bit number over a pointer on 32-bit CPUs.
*/
ASSERT((sizeof(*pNumber) * CHAR_BIT < WIDTH_64) || (zDeserializeTypeWidth(pType) >= WIDTH_64));
ASSERT(sizeof(D) == sizeof(uint64_t));
#ifdef __HAVE_LONG_DOUBLE
ASSERT(sizeof(LD) > sizeof(uint64_t));
#endif
switch (zDeserializeTypeWidth(pType)) {
#ifdef __HAVE_LONG_DOUBLE
case WIDTH_128:
/* FALLTHROUGH */
case WIDTH_96:
/* FALLTHROUGH */
case WIDTH_80:
memcpy(&LD, pNumber, sizeof(long double));
snprintf(pBuffer, zBUfferLength, "%Lg", LD);
break;
#endif
case WIDTH_64:
memcpy(&D, pNumber, sizeof(double));
snprintf(pBuffer, zBUfferLength, "%g", D);
break;
}
}
static void
DeserializeFloatInlined(char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
float F;
double D;
uint32_t U32;
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
ASSERT(sizeof(F) == sizeof(uint32_t));
ASSERT(sizeof(D) == sizeof(uint64_t));
switch (zDeserializeTypeWidth(pType)) {
case WIDTH_64:
ASSERT(sizeof(D) == sizeof(ulNumber));
memcpy(&D, &ulNumber, sizeof(ulNumber));
snprintf(pBuffer, zBUfferLength, "%g", D);
break;
case WIDTH_32:
/*
* On supported platforms sizeof(float)==sizeof(uint32_t)
* unsigned long is either 32 or 64-bit, cast it to 32-bit
* value in order to call memcpy(3) in an Endian-aware way.
*/
U32 = STATIC_CAST(uint32_t, ulNumber);
memcpy(&F, &U32, sizeof(float));
snprintf(pBuffer, zBUfferLength, "%g", F);
break;
case WIDTH_16:
snprintf(pBuffer, zBUfferLength, "Undecoded-16-bit-Floating-Type (%#04" PRIx16 ")", STATIC_CAST(uint16_t, ulNumber));
break;
}
}
#endif
static longest
llliGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
size_t zNumberWidth;
longest L = 0;
ASSERT(szLocation);
ASSERT(pType);
zNumberWidth = zDeserializeTypeWidth(pType);
switch (zNumberWidth) {
default:
Report(true, "UBSan: Unexpected %zu-Bit Type in %s\n", zNumberWidth, szLocation);
__unreachable();
/* NOTREACHED */
case WIDTH_128:
#ifdef __SIZEOF_INT128__
memcpy(&L, REINTERPRET_CAST(longest *, ulNumber), sizeof(longest));
break;
#else
Report(true, "UBSan: Unexpected 128-Bit Type in %s\n", szLocation);
__unreachable();
/* NOTREACHED */
#endif
case WIDTH_64:
if (sizeof(ulNumber) * CHAR_BIT < WIDTH_64) {
L = *REINTERPRET_CAST(int64_t *, ulNumber);
} else {
L = STATIC_CAST(int64_t, STATIC_CAST(uint64_t, ulNumber));
}
break;
case WIDTH_32:
L = STATIC_CAST(int32_t, STATIC_CAST(uint32_t, ulNumber));
break;
case WIDTH_16:
L = STATIC_CAST(int16_t, STATIC_CAST(uint16_t, ulNumber));
break;
case WIDTH_8:
L = STATIC_CAST(int8_t, STATIC_CAST(uint8_t, ulNumber));
break;
}
return L;
}
static ulongest
llluGetNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
size_t zNumberWidth;
ulongest UL = 0;
ASSERT(pType);
zNumberWidth = zDeserializeTypeWidth(pType);
switch (zNumberWidth) {
default:
Report(true, "UBSan: Unexpected %zu-Bit Type in %s\n", zNumberWidth, szLocation);
__unreachable();
/* NOTREACHED */
case WIDTH_128:
#ifdef __SIZEOF_INT128__
memcpy(&UL, REINTERPRET_CAST(ulongest *, ulNumber), sizeof(ulongest));
break;
#else
Report(true, "UBSan: Unexpected 128-Bit Type in %s\n", szLocation);
__unreachable();
/* NOTREACHED */
#endif
case WIDTH_64:
if (sizeof(ulNumber) * CHAR_BIT < WIDTH_64) {
UL = *REINTERPRET_CAST(uint64_t *, ulNumber);
break;
}
/* FALLTHROUGH */
case WIDTH_32:
/* FALLTHROUGH */
case WIDTH_16:
/* FALLTHROUGH */
case WIDTH_8:
UL = ulNumber;
break;
}
return UL;
}
#ifndef _KERNEL
static void
DeserializeNumberFloat(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
size_t zNumberWidth;
ASSERT(szLocation);
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
ASSERT(pType->mTypeKind == KIND_FLOAT);
zNumberWidth = zDeserializeTypeWidth(pType);
switch (zNumberWidth) {
default:
Report(true, "UBSan: Unexpected %zu-Bit Type in %s\n", zNumberWidth, szLocation);
__unreachable();
/* NOTREACHED */
#ifdef __HAVE_LONG_DOUBLE
case WIDTH_128:
/* FALLTHROUGH */
case WIDTH_96:
/* FALLTHROUGH */
case WIDTH_80:
DeserializeFloatOverPointer(pBuffer, zBUfferLength, pType, REINTERPRET_CAST(unsigned long *, ulNumber));
break;
#endif
case WIDTH_64:
if (sizeof(ulNumber) * CHAR_BIT < WIDTH_64) {
DeserializeFloatOverPointer(pBuffer, zBUfferLength, pType, REINTERPRET_CAST(unsigned long *, ulNumber));
break;
}
/* FALLTHROUGH */
case WIDTH_32:
/* FALLTHROUGH */
case WIDTH_16:
DeserializeFloatInlined(pBuffer, zBUfferLength, pType, ulNumber);
break;
}
}
#endif
static void
DeserializeNumber(char *szLocation, char *pBuffer, size_t zBUfferLength, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
ASSERT(szLocation);
ASSERT(pBuffer);
ASSERT(zBUfferLength > 0);
ASSERT(pType);
switch(pType->mTypeKind) {
case KIND_INTEGER:
if (ISSET(pType->mTypeInfo, NUMBER_SIGNED_BIT)) {
longest L = llliGetNumber(szLocation, pType, ulNumber);
DeserializeNumberSigned(pBuffer, zBUfferLength, pType, L);
} else {
ulongest UL = llluGetNumber(szLocation, pType, ulNumber);
DeserializeNumberUnsigned(pBuffer, zBUfferLength, pType, UL);
}
break;
case KIND_FLOAT:
#ifdef _KERNEL
Report(true, "UBSan: Unexpected Float Type in %s\n", szLocation);
__unreachable();
/* NOTREACHED */
#else
DeserializeNumberFloat(szLocation, pBuffer, zBUfferLength, pType, ulNumber);
break;
#endif
case KIND_UNKNOWN:
Report(true, "UBSan: Unknown Type in %s\n", szLocation);
__unreachable();
/* NOTREACHED */
}
}
static const char *
DeserializeTypeCheckKind(uint8_t hhuTypeCheckKind)
{
const char *rgczTypeCheckKinds[] = {
"load of",
"store to",
"reference binding to",
"member access within",
"member call on",
"constructor call on",
"downcast of",
"downcast of",
"upcast of",
"cast to virtual base of",
"_Nonnull binding to",
"dynamic operation on"
};
ASSERT(__arraycount(rgczTypeCheckKinds) > hhuTypeCheckKind);
return rgczTypeCheckKinds[hhuTypeCheckKind];
}
static const char *
DeserializeBuiltinCheckKind(uint8_t hhuBuiltinCheckKind)
{
const char *rgczBuiltinCheckKinds[] = {
"ctz()",
"clz()"
};
ASSERT(__arraycount(rgczBuiltinCheckKinds) > hhuBuiltinCheckKind);
return rgczBuiltinCheckKinds[hhuBuiltinCheckKind];
}
static const char *
DeserializeCFICheckKind(uint8_t hhuCFICheckKind)
{
const char *rgczCFICheckKinds[] = {
"virtual call", // CFI_VCALL
"non-virtual call", // CFI_NVCALL
"base-to-derived cast", // CFI_DERIVEDCAST
"cast to unrelated type", // CFI_UNRELATEDCAST
"indirect function call", // CFI_ICALL
"non-virtual pointer to member function call", // CFI_NVMFCALL
"virtual pointer to member function call", // CFI_VMFCALL
};
ASSERT(__arraycount(rgczCFICheckKinds) > hhuCFICheckKind);
return rgczCFICheckKinds[hhuCFICheckKind];
}
static const char *
DeserializeImplicitConversionCheckKind(uint8_t hhuImplicitConversionCheckKind)
{
const char *rgczImplicitConversionCheckKind[] = {
"integer truncation", /* Not used since 2018 October 11th */
"unsigned integer truncation",
"signed integer truncation",
"integer sign change",
"signed integer trunctation or sign change",
};
ASSERT(__arraycount(rgczImplicitConversionCheckKind) > hhuImplicitConversionCheckKind);
return rgczImplicitConversionCheckKind[hhuImplicitConversionCheckKind];
}
static bool
isNegativeNumber(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber)
{
ASSERT(szLocation);
ASSERT(pType);
ASSERT(pType->mTypeKind == KIND_INTEGER);
if (!ISSET(pType->mTypeInfo, NUMBER_SIGNED_BIT))
return false;
return llliGetNumber(szLocation, pType, ulNumber) < 0;
}
static bool
isShiftExponentTooLarge(char *szLocation, struct CTypeDescriptor *pType, unsigned long ulNumber, size_t zWidth)
{
ASSERT(szLocation);
ASSERT(pType);
ASSERT(pType->mTypeKind == KIND_INTEGER);
return llluGetNumber(szLocation, pType, ulNumber) >= zWidth;
}
