[CTF write up] SECCON CTF 2022 Qual - Babyfile : Hard FSOP Challenge

int __cdecl main(int argc, const char **argv, const char **envp) { int idx; // eax char offset; // [rsp+7h] [rbp-9h] FILE *fd_null; // [rsp+8h] [rbp-8h] alarm(0x1Eu); write(1, "Play with FILE structure\n", 0x19uLL); fd_null = fopen("/dev/null", "r"); if ( fd_null ) { fd_null->__pad2 = 0LL; while ( 1 ) { idx = menu(); if ( idx == 2 ) { write(1, "offset: ", 8uLL); offset = getint(); if ( offset < ..

2022.11.21