136 lines
6.5 KiB
C++
136 lines
6.5 KiB
C++
//===-- asan_interface.h ----------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// This header can be included by the instrumented program to fetch
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// data (mostly allocator statistics) from ASan runtime library.
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//===----------------------------------------------------------------------===//
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#ifndef ASAN_INTERFACE_H
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#define ASAN_INTERFACE_H
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#include <stdint.h> // for __WORDSIZE
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#include <stdlib.h> // for size_t
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// This header should NOT include any other headers from ASan runtime.
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// All functions in this header are extern "C" and start with __asan_.
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extern "C" {
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// This function should be called at the very beginning of the process,
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// before any instrumented code is executed and before any call to malloc.
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void __asan_init()
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__attribute__((visibility("default")));
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// This function should be called by the instrumented code.
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// 'addr' is the address of a global variable called 'name' of 'size' bytes.
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void __asan_register_global(uintptr_t addr, size_t size, const char *name)
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__attribute__((visibility("default")));
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// This structure describes an instrumented global variable.
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struct __asan_global {
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size_t beg; // The address of the global.
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size_t size; // The original size of the global.
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size_t size_with_redzone; // The size with the redzone.
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const char *name; // Name as a C string.
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};
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// These two functions should be called by the instrumented code.
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// 'globals' is an array of structures describing 'n' globals.
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void __asan_register_globals(__asan_global *globals, size_t n)
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__attribute__((visibility("default")));
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void __asan_unregister_globals(__asan_global *globals, size_t n)
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__attribute__((visibility("default")));
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// These two functions are used by the instrumented code in the
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// use-after-return mode. __asan_stack_malloc allocates size bytes of
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// fake stack and __asan_stack_free poisons it. real_stack is a pointer to
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// the real stack region.
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size_t __asan_stack_malloc(size_t size, size_t real_stack)
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__attribute__((visibility("default")));
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void __asan_stack_free(size_t ptr, size_t size, size_t real_stack)
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__attribute__((visibility("default")));
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// Marks memory region [addr, addr+size) as unaddressable.
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// This memory must be previously allocated by the user program. Accessing
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// addresses in this region from instrumented code is forbidden until
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// this region is unpoisoned. This function is not guaranteed to poison
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// the whole region - it may poison only subregion of [addr, addr+size) due
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// to ASan alignment restrictions.
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// Method is NOT thread-safe in the sense that no two threads can
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// (un)poison memory in the same memory region simultaneously.
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void __asan_poison_memory_region(void const volatile *addr, size_t size);
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// Marks memory region [addr, addr+size) as addressable.
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// This memory must be previously allocated by the user program. Accessing
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// addresses in this region is allowed until this region is poisoned again.
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// This function may unpoison a superregion of [addr, addr+size) due to
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// ASan alignment restrictions.
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// Method is NOT thread-safe in the sense that no two threads can
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// (un)poison memory in the same memory region simultaneously.
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void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
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// User code should use macro instead of functions.
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#if defined(__has_feature) && __has_feature(address_sanitizer)
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#define ASAN_POISON_MEMORY_REGION(addr, size) \
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__asan_poison_memory_region((addr), (size))
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#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
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__asan_unpoison_memory_region((addr), (size))
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#else
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#define ASAN_POISON_MEMORY_REGION(addr, size) \
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((void)(addr), (void)(size))
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#define ASAN_UNPOISON_MEMORY_REGION(addr, size) \
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((void)(addr), (void)(size))
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#endif
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// Returns true iff addr is poisoned (i.e. 1-byte read/write access to this
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// address will result in error report from AddressSanitizer).
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bool __asan_address_is_poisoned(void const volatile *addr);
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// This is an internal function that is called to report an error.
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// However it is still a part of the interface because users may want to
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// set a breakpoint on this function in a debugger.
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void __asan_report_error(uintptr_t pc, uintptr_t bp, uintptr_t sp,
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uintptr_t addr, bool is_write, size_t access_size)
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__attribute__((visibility("default")));
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// Sets the exit code to use when reporting an error.
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// Returns the old value.
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int __asan_set_error_exit_code(int exit_code);
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// Returns the estimated number of bytes that will be reserved by allocator
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// for request of "size" bytes. If ASan allocator can't allocate that much
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// memory, returns the maximal possible allocation size, otherwise returns
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// "size".
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size_t __asan_get_estimated_allocated_size(size_t size);
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// Returns true if p is NULL or if p was returned by the ASan allocator and
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// is not yet freed.
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bool __asan_get_ownership(const void *p);
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// Returns the number of bytes reserved for the pointer p.
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// Requires (get_ownership(p) == true).
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size_t __asan_get_allocated_size(const void *p);
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// Number of bytes, allocated and not yet freed by the application.
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size_t __asan_get_current_allocated_bytes();
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// Number of bytes, mmaped by asan allocator to fulfill allocation requests.
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// Generally, for request of X bytes, allocator can reserve and add to free
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// lists a large number of chunks of size X to use them for future requests.
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// All these chunks count toward the heap size. Currently, allocator never
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// releases memory to OS (instead, it just puts freed chunks to free lists).
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size_t __asan_get_heap_size();
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// Number of bytes, mmaped by asan allocator, which can be used to fulfill
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// allocation requests. When a user program frees memory chunk, it can first
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// fall into quarantine and will count toward __asan_get_free_bytes() later.
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size_t __asan_get_free_bytes();
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// Number of bytes in unmapped pages, that are released to OS. Currently,
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// always returns 0.
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size_t __asan_get_unmapped_bytes();
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// Prints accumulated stats to stderr. Used for debugging.
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void __asan_print_accumulated_stats();
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} // namespace
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#endif // ASAN_INTERFACE_H
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