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macho.py: Add support for loaded section hooks for patching

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2021-05-09 03:16:08 +09:00
parent ed32cf6328
commit 6ad3b263a1
1 changed files with 5 additions and 2 deletions
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7
proxyclient/macho.py
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@ -19,7 +19,7 @@ class MachO:
elif cmd.cmd == MachOLoadCmdType.UNIXTHREAD:
self.entry = cmd.args[0].data.pc
def prepare_image(self):
def prepare_image(self, load_hook=None):
memory_size = self.vmax - self.vmin
image = bytearray(memory_size)
@ -33,7 +33,10 @@ class MachO:
end = min(len(self.data), cmd.args.fileoff + cmd.args.filesize)
size = end - cmd.args.fileoff
print(f"LOAD: {cmd.args.segname} {size} bytes from {cmd.args.fileoff:x} to {dest:x}")
image[dest:dest + size] = self.data[cmd.args.fileoff:end]
data = self.data[cmd.args.fileoff:end]
if load_hook is not None:
data = load_hook(data, cmd.args.segname, size, cmd.args.fileoff, dest)
image[dest:dest + size] = data
if cmd.args.vmsize > size:
clearsize = cmd.args.vmsize - size
if cmd.args.segname == "PYLD":