8681202dd6
This change adds a new weak API function which makes the sanitizer ignore the call to free(), and implements the functionality in ASan and HWAsan. The runtime that implements this hook can then call free() at a later point again on the same pointer (and making sure the hook returns zero so that the memory will actually be freed) when it's actually ready for the memory to be cleaned up. This is needed in order to implement an sanitizer-compatible version of Chrome's BackupRefPtr algorithm, since process-wide double-shimming of malloc/free does not work on some platforms. Requested and designed by @c01db33f (Mark) from Project Zero. --------- Co-authored-by: Mark Brand <markbrand@google.com>
54 lines
2.1 KiB
C
54 lines
2.1 KiB
C
//===-- sanitizer_allocator_interface.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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//
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// Re-declaration of functions from public sanitizer allocator interface.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_ALLOCATOR_INTERFACE_H
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#define SANITIZER_ALLOCATOR_INTERFACE_H
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#include "sanitizer_internal_defs.h"
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using __sanitizer::uptr;
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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uptr __sanitizer_get_estimated_allocated_size(uptr size);
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SANITIZER_INTERFACE_ATTRIBUTE int __sanitizer_get_ownership(const void *p);
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SANITIZER_INTERFACE_ATTRIBUTE const void *__sanitizer_get_allocated_begin(
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const void *p);
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SANITIZER_INTERFACE_ATTRIBUTE uptr
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__sanitizer_get_allocated_size(const void *p);
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SANITIZER_INTERFACE_ATTRIBUTE uptr
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__sanitizer_get_allocated_size_fast(const void *p);
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SANITIZER_INTERFACE_ATTRIBUTE uptr __sanitizer_get_current_allocated_bytes();
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SANITIZER_INTERFACE_ATTRIBUTE uptr __sanitizer_get_heap_size();
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SANITIZER_INTERFACE_ATTRIBUTE uptr __sanitizer_get_free_bytes();
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SANITIZER_INTERFACE_ATTRIBUTE uptr __sanitizer_get_unmapped_bytes();
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SANITIZER_INTERFACE_ATTRIBUTE int __sanitizer_install_malloc_and_free_hooks(
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void (*malloc_hook)(const void *, uptr),
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void (*free_hook)(const void *));
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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void __sanitizer_malloc_hook(void *ptr, uptr size);
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE
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void __sanitizer_free_hook(void *ptr);
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE int
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__sanitizer_ignore_free_hook(void *ptr);
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void
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__sanitizer_purge_allocator();
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SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE void
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__sanitizer_print_memory_profile(uptr top_percent, uptr max_number_of_contexts);
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} // extern "C"
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#endif // SANITIZER_ALLOCATOR_INTERFACE_H
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