Hi, hackers! I wrote a small kernel module whch impliments some syscall. Syscall takes a char * as a parameter. Theoriticaly its posible to pass a bad pointer from userland. What should I do in orde to check the pointer from userland? I use copyout(9) to store data from kernel to userland but it doesn't seams to be enough - systems got panic if I pass a bad pounter. I think I'm missing something important about kernel programming.
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