mirror of
https://github.com/chipsec/chipsec
synced 2026-06-08 13:31:00 +00:00
BrentHoltsclaw
206 lines
9.1 KiB
Python
206 lines
9.1 KiB
Python
#!/usr/bin/python
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#CHIPSEC: Platform Security Assessment Framework
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#Copyright (c) 2010-2019, 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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import os
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import time
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import chipsec_util
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import chipsec.defines
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import chipsec.file
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from chipsec.logger import print_buffer
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from chipsec.command import BaseCommand
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# Physical Memory
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class MemCommand(BaseCommand):
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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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>>> chipsec_util mem search 0xF0000 0x10000 _SM_
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"""
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def requires_driver(self):
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# No driver required when printing the util documentation
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if len(self.argv) < 3:
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return False
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return True
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def dump_region_to_path(self,path,pa_start,pa_end):
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if pa_start >= pa_end: return
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pa = (pa_start + chipsec.defines.ALIGNED_4KB) & ~chipsec.defines.ALIGNED_4KB
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head_len = pa_start & chipsec.defines.ALIGNED_4KB
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tail_len = pa_end & chipsec.defines.ALIGNED_4KB
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pa = pa_start - head_len + chipsec.defines.ALIGNED_4KB + 1
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fname = os.path.join(path, "m{:016X}.bin".format(pa_start))
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f = open(fname, 'wb')
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end = pa_end - tail_len
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# read leading bytes to the next boundary
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if (head_len > 0 ):
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f.write(self.cs.mem.read_physical_mem(pa_start, chipsec.defines.ALIGNED_4KB + 1 - head_len))
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for addr in range(pa,end,chipsec.defines.ALIGNED_4KB+1):
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f.write(self.cs.mem.read_physical_mem(addr,chipsec.defines.ALIGNED_4KB+1))
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# read trailing bytes
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if (tail_len > 0):
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f.write(self.cs.mem.read_physical_mem(end, tail_len))
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f.close()
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def run(self):
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size = 0x100
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if len(self.argv) < 3:
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print (MemCommand.__doc__)
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return
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op = self.argv[2]
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t = time.time()
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if 'allocate' == op and 4 == len(self.argv):
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size = int(self.argv[3],16)
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(va, pa) = self.cs.mem.alloc_physical_mem( size )
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self.logger.log( '[CHIPSEC] Allocated {:X} bytes of physical memory: VA = 0x{:016X}, PA = 0x{:016X}'.format(size, va, pa) )
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elif 'search' == op and len(self.argv) > 5:
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phys_address = int(self.argv[3],16)
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size = int(self.argv[4],16)
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buffer = self.cs.mem.read_physical_mem( phys_address, size )
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buffer = chipsec.defines.bytestostring(buffer)
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offset = buffer.find(self.argv[5])
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if offset != -1:
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self.logger.log( '[CHIPSEC] search buffer from memory: PA = 0x{:016X}, len = 0x{:X}, target address= 0x{:X}..'.format(phys_address, size, phys_address + offset) )
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else:
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self.logger.log( '[CHIPSEC] search buffer from memory: PA = 0x{:016X}, len = 0x{:X}, can not find the target in the searched range..'.format(phys_address, size) )
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elif 'pagedump' == op and len(self.argv) > 3:
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start = int(self.argv[3],16)
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length = int(self.argv[4],16) if len(self.argv) > 4 else chipsec.defines.BOUNDARY_4KB
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end = start + length
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self.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(self.argv[3],16)
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size = int(self.argv[4],16) if len(self.argv) > 4 else 0x100
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self.logger.log( '[CHIPSEC] reading buffer from memory: PA = 0x{:016X}, len = 0x{:X}..'.format(phys_address, size) )
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buffer = self.cs.mem.read_physical_mem( phys_address, size )
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if len(self.argv) > 5:
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buf_file = self.argv[5]
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chipsec.file.write_file( buf_file, buffer )
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self.logger.log( "[CHIPSEC] written 0x{:X} bytes to '{}'".format(len(buffer), buf_file) )
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else:
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print_buffer( chipsec.defines.bytestostring(buffer) )
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elif 'readval' == op:
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phys_address = int(self.argv[3],16)
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width = 0x4
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if len(self.argv) > 4:
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width = chipsec_util.get_option_width(self.argv[4]) if chipsec_util.is_option_valid_width(self.argv[4]) else int(self.argv[4],16)
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self.logger.log( '[CHIPSEC] reading {:X}-byte value from PA 0x{:016X}..'.format(width, phys_address) )
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if 0x1 == width: value = self.cs.mem.read_physical_mem_byte ( phys_address )
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elif 0x2 == width: value = self.cs.mem.read_physical_mem_word ( phys_address )
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elif 0x4 == width: value = self.cs.mem.read_physical_mem_dword( phys_address )
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self.logger.log( '[CHIPSEC] value = 0x{:X}'.format(value) )
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elif 'write' == op:
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phys_address = int(self.argv[3],16)
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if len(self.argv) > 4:
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size = int(self.argv[4],16)
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else:
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self.logger.error( "must specify <length> argument in 'mem write'" )
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return
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if len(self.argv) > 5:
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buf_file = self.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 as e:
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self.logger.error( "incorrect <value> specified: '{}'".format(buf_file) )
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self.logger.error( str(e) )
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return
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self.logger.log( "[CHIPSEC] read 0x{:X} hex bytes from command-line: {}'".format(len(buffer), buf_file) )
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else:
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buffer = chipsec.file.read_file( buf_file )
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self.logger.log( "[CHIPSEC] read 0x{:X} bytes from file '{}'".format(len(buffer), buf_file) )
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if len(buffer) < size:
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self.logger.error( "number of bytes read (0x{:X}) is less than the specified <length> (0x{:X})".format(len(buffer),size) )
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return
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self.logger.log( '[CHIPSEC] writing buffer to memory: PA = 0x{:016X}, len = 0x{:X}..'.format(phys_address, size) )
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self.cs.mem.write_physical_mem( phys_address, size, buffer )
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else:
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self.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(self.argv[3],16)
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if len(self.argv) > 4:
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width = chipsec_util.get_option_width(self.argv[4]) if chipsec_util.is_option_valid_width(self.argv[4]) else int(self.argv[4],16)
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else:
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self.logger.error( "must specify <length> argument in 'mem writeval' as one of {}".format(chipsec_util.CMD_OPTS_WIDTH) )
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return
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if len(self.argv) > 5:
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value = int(self.argv[5],16)
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else:
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self.logger.error( "must specify <value> argument in 'mem writeval'" )
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return
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self.logger.log( '[CHIPSEC] writing {:X}-byte value 0x{:X} to PA 0x{:016X}..'.format(width, value, phys_address) )
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if 0x1 == width: self.cs.mem.write_physical_mem_byte ( phys_address, value )
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elif 0x2 == width: self.cs.mem.write_physical_mem_word ( phys_address, value )
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elif 0x4 == width: self.cs.mem.write_physical_mem_dword( phys_address, value )
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else:
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print (MemCommand.__doc__)
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return
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self.logger.log( "[CHIPSEC] (mem) time elapsed {:.3f}".format(time.time()-t) )
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commands = { 'mem': MemCommand }
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