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Diffstat (limited to 'python/examples/jump_table.py')
| -rw-r--r-- | python/examples/jump_table.py | 86 |
1 files changed, 0 insertions, 86 deletions
diff --git a/python/examples/jump_table.py b/python/examples/jump_table.py deleted file mode 100644 index 419cc188..00000000 --- a/python/examples/jump_table.py +++ /dev/null @@ -1,86 +0,0 @@ -# Copyright (c) 2015-2017 Vector 35 LLC -# -# Permission is hereby granted, free of charge, to any person obtaining a copy -# of this software and associated documentation files (the "Software"), to -# deal in the Software without restriction, including without limitation the -# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or -# sell copies of the Software, and to permit persons to whom the Software is -# furnished to do so, subject to the following conditions: -# -# The above copyright notice and this permission notice shall be included in -# all copies or substantial portions of the Software. -# -# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING -# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS -# IN THE SOFTWARE. - -# This plugin will attempt to resolve simple jump tables (an array of code pointers) and add the destinations -# as indirect branch targets so that the flow graph reflects the jump table's control flow. -from binaryninja.plugin import PluginCommand -from binaryninja.enums import InstructionTextTokenType -import struct - - -def find_jump_table(bv, addr): - for block in bv.get_basic_blocks_at(addr): - func = block.function - arch = func.arch - addrsize = arch.address_size - - # Grab the instruction tokens so that we can look for the table's starting address - tokens, length = arch.get_instruction_text(bv.read(addr, 16), addr) - - # Look for the next jump instruction, which may be the current instruction. Some jump tables will - # compute the address first then jump to the computed address as a separate instruction. - jump_addr = addr - while jump_addr < block.end: - info = arch.get_instruction_info(bv.read(jump_addr, 16), jump_addr) - if len(info.branches) != 0: - break - jump_addr += info.length - if jump_addr >= block.end: - print "Unable to find jump after instruction 0x%x" % addr - continue - print "Jump at 0x%x" % jump_addr - - # Collect the branch targets for any tables referenced by the clicked instruction - branches = [] - for token in tokens: - if InstructionTextTokenType(token.type) == InstructionTextTokenType.PossibleAddressToken: # Table addresses will be a "possible address" token - tbl = token.value - print "Found possible table at 0x%x" % tbl - i = 0 - while True: - # Read the next pointer from the table - data = bv.read(tbl + (i * addrsize), addrsize) - if len(data) == addrsize: - if addrsize == 4: - ptr = struct.unpack("<I", data)[0] - else: - ptr = struct.unpack("<Q", data)[0] - - # If the pointer is within the binary, add it as a destination and continue - # to the next entry - if (ptr >= bv.start) and (ptr < bv.end): - print "Found destination 0x%x" % ptr - branches.append((arch, ptr)) - else: - # Once a value that is not a pointer is encountered, the jump table is ended - break - else: - # Reading invalid memory - break - - i += 1 - - # Set the indirect branch targets on the jump instruction to be the list of targets discovered - func.set_user_indirect_branches(jump_addr, branches) - - -# Create a plugin command so that the user can right click on an instruction referencing a jump table and -# invoke the command -PluginCommand.register_for_address("Process jump table", "Look for jump table destinations", find_jump_table) |