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# SPDX-License-Identifier: GPL-2.0 # # Copyright 2019 Google LLC. import gdb import zlib from linux import utils class LxConfigDump(gdb.Command): """Output kernel config to the filename specified as the command argument. Equivalent to 'zcat /proc/config.gz > config.txt' on a running target""" def __init__(self): super(LxConfigDump, self).__init__("lx-configdump", gdb.COMMAND_DATA, gdb.COMPLETE_FILENAME) def invoke(self, arg, from_tty): if len(arg) == 0: filename = "config.txt" else: filename = arg try: py_config_ptr = gdb.parse_and_eval("&kernel_config_data") py_config_ptr_end = gdb.parse_and_eval("&kernel_config_data_end") py_config_size = py_config_ptr_end - py_config_ptr except gdb.error as e: raise gdb.GdbError("Can't find config, enable CONFIG_IKCONFIG?") inf = gdb.inferiors()[0] zconfig_buf = utils.read_memoryview(inf, py_config_ptr, py_config_size).tobytes() config_buf = zlib.decompress(zconfig_buf, 16) with open(filename, 'wb') as f: f.write(config_buf) gdb.write("Dumped config to " + filename + "\n") LxConfigDump()