$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: service calls malloc(N) with random sizes for 42 rounds and asks for the glibc chunk size field value. Solution: implement request2size macro (add SIZE_SZ, align to 16, enforce MINSIZE 0x20, set PREV_INUSE bit), send as 8 raw little-endian bytes.
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