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Implement padding for small payload

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perillamint 2020-08-02 05:30:06 +09:00
parent 3b1b2bcca1
commit 8ea7e400f5
1 changed files with 7 additions and 0 deletions
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7
fusee-launcher.py
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@ -642,6 +642,13 @@ with open(payload_path, "rb") as f:
# Fit a collection of the payload before the stack spray... # Fit a collection of the payload before the stack spray...
padding_size = STACK_SPRAY_START - PAYLOAD_START_ADDR padding_size = STACK_SPRAY_START - PAYLOAD_START_ADDR
if len(target_payload) < padding_size:
# Add NOP tail to correct heap spray location
tail_len = padding_size - len(target_payload)
print(f"Padding payload with {tail_len} byte of zeroes")
target_payload += bytearray(tail_len)
payload += target_payload[:padding_size] payload += target_payload[:padding_size]
# ... insert the stack spray... # ... insert the stack spray...