mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-22 04:30:03 +00:00
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===-- hwasan_malloc_bisect.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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file is a part of HWAddressSanitizer.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "sanitizer_common/sanitizer_hash.h"
|
|
#include "hwasan.h"
|
|
|
|
namespace __hwasan {
|
|
|
|
static u32 malloc_hash(StackTrace *stack, uptr orig_size) {
|
|
uptr len = Min(stack->size, (unsigned)7);
|
|
MurMur2HashBuilder H(len);
|
|
H.add(orig_size);
|
|
// Start with frame #1 to skip __sanitizer_malloc frame, which is
|
|
// (a) almost always the same (well, could be operator new or new[])
|
|
// (b) can change hashes when compiler-rt is rebuilt, invalidating previous
|
|
// bisection results.
|
|
// Because of ASLR, use only offset inside the page.
|
|
for (uptr i = 1; i < len; ++i) H.add(((u32)stack->trace[i]) & 0xFFF);
|
|
return H.get();
|
|
}
|
|
|
|
static inline bool malloc_bisect(StackTrace *stack, uptr orig_size) {
|
|
uptr left = flags()->malloc_bisect_left;
|
|
uptr right = flags()->malloc_bisect_right;
|
|
if (LIKELY(left == 0 && right == 0))
|
|
return true;
|
|
if (!stack)
|
|
return true;
|
|
// Allow malloc_bisect_right > (u32)(-1) to avoid spelling the latter in
|
|
// decimal.
|
|
uptr h = (uptr)malloc_hash(stack, orig_size);
|
|
if (h < left || h > right)
|
|
return false;
|
|
if (flags()->malloc_bisect_dump) {
|
|
Printf("[alloc] %u %zu\n", h, orig_size);
|
|
stack->Print();
|
|
}
|
|
return true;
|
|
}
|
|
|
|
} // namespace __hwasan
|