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92 lines
2.0 KiB
92 lines
2.0 KiB
4 months ago
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import sys
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import traceback
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from cffi import api as _api
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sys.modules["ssl"] = None
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sys.modules["_hashlib"] = None
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_ffi = _api.FFI()
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_ffi.cdef(
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"""
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void *malloc(size_t size);
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void free(void *ptr);
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void *realloc(void *ptr, size_t size);
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int CRYPTO_set_mem_functions(
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void *(*m)(size_t),void *(*r)(void *,size_t), void (*f)(void *));
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int backtrace(void **buffer, int size);
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char **backtrace_symbols(void *const *buffer, int size);
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void backtrace_symbols_fd(void *const *buffer, int size, int fd);
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"""
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) # noqa
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_api = _ffi.verify(
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"""
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#include <openssl/crypto.h>
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#include <stdlib.h>
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#include <execinfo.h>
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""",
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libraries=["crypto"],
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)
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C = _ffi.dlopen(None)
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verbose = False
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def log(s):
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if verbose:
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print(s)
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def _backtrace():
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buf = _ffi.new("void*[]", 64)
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result = _api.backtrace(buf, len(buf))
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strings = _api.backtrace_symbols(buf, result)
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stack = [_ffi.string(strings[i]) for i in range(result)]
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C.free(strings)
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return stack
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@_ffi.callback("void*(*)(size_t)")
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def malloc(n):
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memory = C.malloc(n)
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python_stack = traceback.extract_stack(limit=3)
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c_stack = _backtrace()
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heap[memory] = [(n, python_stack, c_stack)]
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log("malloc(%d) -> %s" % (n, memory))
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return memory
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@_ffi.callback("void*(*)(void*, size_t)")
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def realloc(p, n):
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memory = C.realloc(p, n)
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old = heap.pop(p)
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python_stack = traceback.extract_stack(limit=3)
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c_stack = _backtrace()
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old.append((n, python_stack, c_stack))
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heap[memory] = old
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log("realloc(0x%x, %d) -> %s" % (int(_ffi.cast("int", p)), n, memory))
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return memory
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@_ffi.callback("void(*)(void*)")
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def free(p):
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if p != _ffi.NULL:
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C.free(p)
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del heap[p]
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log("free(0x%x)" % (int(_ffi.cast("int", p)),))
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if _api.CRYPTO_set_mem_functions(malloc, realloc, free):
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log("Enabled memory debugging")
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heap = {}
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else:
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log("Failed to enable memory debugging")
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heap = None
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