1 //===-- sanitizer_allocator_checks.h ----------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Various checks shared between ThreadSanitizer, MemorySanitizer, etc. memory
13 //===----------------------------------------------------------------------===//
15 #ifndef SANITIZER_ALLOCATOR_CHECKS_H
16 #define SANITIZER_ALLOCATOR_CHECKS_H
18 #include "sanitizer_errno.h"
19 #include "sanitizer_internal_defs.h"
20 #include "sanitizer_common.h"
21 #include "sanitizer_platform.h"
23 namespace __sanitizer {
25 // A common errno setting logic shared by almost all sanitizer allocator APIs.
26 INLINE void *SetErrnoOnNull(void *ptr) {
32 // In case of the check failure, the caller of the following Check... functions
33 // should "return POLICY::OnBadRequest();" where POLICY is the current allocator
34 // failure handling policy.
36 // Checks aligned_alloc() parameters, verifies that the alignment is a power of
37 // two and that the size is a multiple of alignment for POSIX implementation,
38 // and a bit relaxed requirement for non-POSIX ones, that the size is a multiple
40 INLINE bool CheckAlignedAllocAlignmentAndSize(uptr alignment, uptr size) {
42 return IsPowerOfTwo(alignment) && (size & (alignment - 1)) == 0;
44 return size % alignment == 0;
48 // Checks posix_memalign() parameters, verifies that alignment is a power of two
49 // and a multiple of sizeof(void *).
50 INLINE bool CheckPosixMemalignAlignment(uptr alignment) {
51 return IsPowerOfTwo(alignment) && (alignment % sizeof(void *)) == 0; // NOLINT
54 // Returns true if calloc(size, n) call overflows on size*n calculation.
55 INLINE bool CheckForCallocOverflow(uptr size, uptr n) {
59 return (max / size) < n;
62 } // namespace __sanitizer
64 #endif // SANITIZER_ALLOCATOR_CHECKS_H