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652707a645
* The performance is better than the glibc allocator. * Allocator interface functions, sanitizer allocator options, and MallocHooks/FreeHooks are supported. * Shadow memory has specific memory layout requirement. Using libc allocator could lead to conflicts. * When we add a mmap interceptor for reliability (the VMA could reuse a previously released VMA that is poisoned): glibc may invoke an internal system call to call unmmap, which cannot be intercepted. We will not be able to return the shadow memory to the OS. Similar to dfsan https://reviews.llvm.org/D101204 . Also intercept operator new/delete to be similar to other sanitizers using the sanitizer allocator. The align_val_t overload of operator new has slightly less overhead. Pull Request: https://github.com/llvm/llvm-project/pull/102764
42 lines
1.3 KiB
C++
42 lines
1.3 KiB
C++
//===-- nsan_allocator.h ----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef NSAN_ALLOCATOR_H
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#define NSAN_ALLOCATOR_H
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#include "sanitizer_common/sanitizer_common.h"
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namespace __nsan {
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struct NsanThreadLocalMallocStorage {
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// Allocator cache contains atomic_uint64_t which must be 8-byte aligned.
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alignas(8) uptr allocator_cache[96 * (512 * 8 + 16)]; // Opaque.
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void Init();
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void CommitBack();
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private:
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// These objects are allocated via mmap() and are zero-initialized.
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NsanThreadLocalMallocStorage() {}
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};
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void NsanAllocatorInit();
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void NsanDeallocate(void *ptr);
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void *nsan_malloc(uptr size);
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void *nsan_calloc(uptr nmemb, uptr size);
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void *nsan_realloc(void *ptr, uptr size);
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void *nsan_reallocarray(void *ptr, uptr nmemb, uptr size);
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void *nsan_valloc(uptr size);
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void *nsan_pvalloc(uptr size);
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void *nsan_aligned_alloc(uptr alignment, uptr size);
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void *nsan_memalign(uptr alignment, uptr size);
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int nsan_posix_memalign(void **memptr, uptr alignment, uptr size);
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} // namespace __nsan
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#endif // NSAN_ALLOCATOR_H
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