$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: Remote service dumps full glibc 2.31 main_arena and tcache state, asks to predict 42 consecutive malloc() return pointers with an arbitrary read oracle. Solution: Simulate _int_malloc algorithm — tcache direct lookup for small sizes, fastbin/smallbin from arena dump, unsorted bin bk-scan for exact-fit large chunks.
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