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https://github.com/chipsec/chipsec
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CHIPSEC
217 lines
8.2 KiB
Python
217 lines
8.2 KiB
Python
#!/usr/local/bin/python
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#CHIPSEC: Platform Security Assessment Framework
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#Copyright (c) 2010-2015, Intel Corporation
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#
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#This program is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public License
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#as published by the Free Software Foundation; Version 2.
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#
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#This program is distributed in the hope that it will be useful,
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#but WITHOUT ANY WARRANTY; without even the implied warranty of
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#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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#GNU General Public License for more details.
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#
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#You should have received a copy of the GNU General Public License
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#along with this program; if not, write to the Free Software
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#Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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#Contact information:
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#chipsec@intel.com
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#
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"""
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The mem command provides direct access to read and write physical memory.
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"""
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__version__ = '1.0'
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import os
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import sys
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import time
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import chipsec_util
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import chipsec.file
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import chipsec.logger
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from chipsec.logger import *
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from chipsec.file import *
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import chipsec.chipset
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import chipsec.defines
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def read_mem(pa, size = chipsec.defines.BOUNDARY_4KB):
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try:
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buffer = chipsec_util._cs.mem.read_physical_mem( pa, size )
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except:
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buffer = None
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return buffer
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def dump_region_to_path(path, pa_start, pa_end):
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pa = (pa_start + chipsec.defines.ALIGNED_4KB) & ~chipsec.defines.ALIGNED_4KB
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end = pa_end & ~chipsec.defines.ALIGNED_4KB
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head_len = pa - pa_start
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tail_len = pa_end - end
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f = None
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# read leading bytes to the next boundary
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if (head_len > 0):
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b = read_mem(pa_start, head_len)
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if b is not None:
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fname = os.path.join(path, "m%016X.bin" % pa_start)
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f = open(fname, 'wb')
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f.write(b)
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while pa < end:
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b = read_mem(pa)
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if b is not None:
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if f is None:
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fname = os.path.join(path, "m%016X.bin" % pa)
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f = open(fname, 'wb')
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f.write(b)
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else:
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if f is not None:
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f.close()
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f = None
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pa += chipsec.defines.BOUNDARY_4KB
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# read trailing bytes
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if (tail_len > 0):
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b = read_mem(end, tail_len)
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if b is not None:
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if f is None:
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fname = os.path.join(path, "m%016X.bin" % end)
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f = open(fname, 'wb')
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f.write(b)
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if f is not None:
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f.close()
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# Physical Memory
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def mem(argv):
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"""
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>>> chipsec_util mem <op> <physical_address> <length> [value|buffer_file]
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>>>
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>>> <physical_address> : 64-bit physical address
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>>> <op> : read|readval|write|writeval|allocate|pagedump
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>>> <length> : byte|word|dword or length of the buffer from <buffer_file>
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>>> <value> : byte, word or dword value to be written to memory at <physical_address>
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>>> <buffer_file> : file with the contents to be written to memory at <physical_address>
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Examples:
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>>> chipsec_util mem <op> <physical_address> <length> [value|file]
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>>> chipsec_util mem readval 0xFED40000 dword
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>>> chipsec_util mem read 0x41E 0x20 buffer.bin
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>>> chipsec_util mem writeval 0xA0000 dword 0x9090CCCC
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>>> chipsec_util mem write 0x100000000 0x1000 buffer.bin
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>>> chipsec_util mem write 0x100000000 0x10 000102030405060708090A0B0C0D0E0F
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>>> chipsec_util mem allocate 0x1000
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>>> chipsec_util mem pagedump 0xFED00000 0x100000
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"""
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phys_address = 0
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size = 0x100
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if 3 > len(argv):
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print mem.__doc__
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return
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op = argv[2]
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t = time.time()
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if 'allocate' == op and 4 == len(argv):
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size = int(argv[3],16)
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(va, pa) = chipsec_util._cs.mem.alloc_physical_mem( size )
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logger().log( '[CHIPSEC] Allocated %X bytes of physical memory: VA = 0x%016X, PA = 0x%016X' % (size, va, pa) )
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elif 'pagedump' == op and len(argv) > 3:
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start = long(argv[3],16)
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length = long(argv[4],16) if len(argv) > 4 else chipsec.defines.BOUNDARY_4KB
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end = start + length
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dump_region_to_path( chipsec.file.get_main_dir(), start, end )
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elif 'read' == op:
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phys_address = int(argv[3],16)
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size = int(argv[4],16) if len(argv) > 4 else 0x100
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logger().log( '[CHIPSEC] reading buffer from memory: PA = 0x%016X, len = 0x%X..' % (phys_address, size) )
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buffer = chipsec_util._cs.mem.read_physical_mem( phys_address, size )
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if len(argv) > 5:
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buf_file = argv[5]
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chipsec.file.write_file( buf_file, buffer )
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logger().log( "[CHIPSEC] written 0x%X bytes to '%s'" % (len(buffer), buf_file) )
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else:
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print_buffer( buffer )
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elif 'readval' == op:
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phys_address = int(argv[3],16)
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width = 0x4
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if len(argv) > 4:
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width = chipsec_util.get_option_width(argv[4]) if chipsec_util.is_option_valid_width(argv[4]) else int(argv[4],16)
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logger().log( '[CHIPSEC] reading %X-byte value from PA 0x%016X..' % (width, phys_address) )
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if 0x1 == width: value = chipsec_util._cs.mem.read_physical_mem_byte ( phys_address )
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elif 0x2 == width: value = chipsec_util._cs.mem.read_physical_mem_word ( phys_address )
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elif 0x4 == width: value = chipsec_util._cs.mem.read_physical_mem_dword( phys_address )
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logger().log( '[CHIPSEC] value = 0x%X' % value )
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elif 'write' == op:
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phys_address = int(argv[3],16)
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if len(argv) > 4:
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size = int(argv[4],16)
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else:
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logger().error( "must specify <length> argument in 'mem write'" )
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return
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if len(argv) > 5:
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buf_file = argv[5]
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if not os.path.exists( buf_file ):
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#buffer = buf_file.decode('hex')
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try:
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buffer = bytearray.fromhex(buf_file)
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except ValueError, e:
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logger().error( "incorrect <value> specified: '%s'" % buf_file )
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logger().error( str(e) )
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return
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logger().log( "[CHIPSEC] read 0x%X hex bytes from command-line: %s'" % (len(buffer), buf_file) )
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else:
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buffer = chipsec.file.read_file( buf_file )
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logger().log( "[CHIPSEC] read 0x%X bytes from file '%s'" % (len(buffer), buf_file) )
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if len(buffer) < size:
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logger().error( "number of bytes read (0x%X) is less than the specified <length> (0x%X)" % (len(buffer),size) )
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return
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logger().log( '[CHIPSEC] writing buffer to memory: PA = 0x%016X, len = 0x%X..' % (phys_address, size) )
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chipsec_util._cs.mem.write_physical_mem( phys_address, size, buffer )
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else:
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logger().error( "must specify <buffer>|<file> argument in 'mem write'" )
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return
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elif 'writeval' == op:
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phys_address = int(argv[3],16)
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if len(argv) > 4:
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width = chipsec_util.get_option_width(argv[4]) if chipsec_util.is_option_valid_width(argv[4]) else int(argv[4],16)
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else:
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logger().error( "must specify <length> argument in 'mem writeval' as one of %s" % chipsec_util.CMD_OPTS_WIDTH )
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return
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if len(argv) > 5:
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value = int(argv[5],16)
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else:
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logger().error( "must specify <value> argument in 'mem writeval'" )
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return
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logger().log( '[CHIPSEC] writing %X-byte value 0x%X to PA 0x%016X..' % (width, value, phys_address) )
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if 0x1 == width: chipsec_util._cs.mem.write_physical_mem_byte ( phys_address, value )
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elif 0x2 == width: chipsec_util._cs.mem.write_physical_mem_word ( phys_address, value )
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elif 0x4 == width: chipsec_util._cs.mem.write_physical_mem_dword( phys_address, value )
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else:
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print mem.__doc__
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return
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logger().log( "[CHIPSEC] (mem) time elapsed %.3f" % (time.time()-t) )
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chipsec_util.commands['mem'] = {'func' : mem, 'start_driver' : True, 'help' : mem.__doc__ }
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