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Puzzle 1

CALLVALUE, JUMP, JUMPDEST

Puzzle
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# Puzzle 1 #
############
​
00      34      CALLVALUE
01      56      JUMP
02      FD      REVERT
03      FD      REVERT
04      FD      REVERT
05      FD      REVERT
06      FD      REVERT
07      FD      REVERT
08      5B      JUMPDEST
09      00      STOP
​
? Enter the value to send: (0) 
Solution
Look up CALLVALUE on evm.codes:
Get deposited value by the instruction/transaction responsible for this execution
In other words, CALLVALUE pushes msg.value onto the stack. In this puzzle, our input is used as msg.value.
After that, JUMP is going to pop the top element from the stack, which is msg.value. This is equivalent to calling jump(msg.value). It changes the PC to the address specified by our input.
The objective is to jump to address 0x08, so 8 is the correct input.

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EVM Puzzles

Puzzle 2

Last modified 1d ago