forked from OSchip/llvm-project
73 lines
2.3 KiB
C++
73 lines
2.3 KiB
C++
//===-- wrappers_c_checks.h -------------------------------------*- 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef SCUDO_CHECKS_H_
|
|
#define SCUDO_CHECKS_H_
|
|
|
|
#include "common.h"
|
|
|
|
#include <errno.h>
|
|
|
|
#ifndef __has_builtin
|
|
#define __has_builtin(X) 0
|
|
#endif
|
|
|
|
namespace scudo {
|
|
|
|
// A common errno setting logic shared by almost all Scudo C wrappers.
|
|
inline void *setErrnoOnNull(void *Ptr) {
|
|
if (UNLIKELY(!Ptr))
|
|
errno = ENOMEM;
|
|
return Ptr;
|
|
}
|
|
|
|
// Checks return true on failure.
|
|
|
|
// Checks aligned_alloc() parameters, verifies that the alignment is a power of
|
|
// two and that the size is a multiple of alignment.
|
|
inline bool checkAlignedAllocAlignmentAndSize(uptr Alignment, uptr Size) {
|
|
return Alignment == 0 || !isPowerOfTwo(Alignment) ||
|
|
!isAligned(Size, Alignment);
|
|
}
|
|
|
|
// Checks posix_memalign() parameters, verifies that alignment is a power of two
|
|
// and a multiple of sizeof(void *).
|
|
inline bool checkPosixMemalignAlignment(uptr Alignment) {
|
|
return Alignment == 0 || !isPowerOfTwo(Alignment) ||
|
|
!isAligned(Alignment, sizeof(void *));
|
|
}
|
|
|
|
// Returns true if calloc(Size, N) overflows on Size*N calculation. Use a
|
|
// builtin supported by recent clang & GCC if it exists, otherwise fallback to a
|
|
// costly division.
|
|
inline bool checkForCallocOverflow(uptr Size, uptr N, uptr *Product) {
|
|
#if __has_builtin(__builtin_umull_overflow) && (SCUDO_WORDSIZE == 64U)
|
|
return __builtin_umull_overflow(Size, N,
|
|
reinterpret_cast<unsigned long *>(Product));
|
|
#elif __has_builtin(__builtin_umul_overflow) && (SCUDO_WORDSIZE == 32U)
|
|
// On, e.g. armv7, uptr/uintptr_t may be defined as unsigned long
|
|
return __builtin_umul_overflow(Size, N,
|
|
reinterpret_cast<unsigned int *>(Product));
|
|
#else
|
|
*Product = Size * N;
|
|
if (!Size)
|
|
return false;
|
|
return (*Product / Size) != N;
|
|
#endif
|
|
}
|
|
|
|
// Returns true if the size passed to pvalloc overflows when rounded to the next
|
|
// multiple of PageSize.
|
|
inline bool checkForPvallocOverflow(uptr Size, uptr PageSize) {
|
|
return roundUpTo(Size, PageSize) < Size;
|
|
}
|
|
|
|
} // namespace scudo
|
|
|
|
#endif // SCUDO_CHECKS_H_
|