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# Fuzz -- A kernel fuzzer from Plan 9 space ## Dependencies fuzz(1) is tested on the [9front](http://9front.org) operating system and as such uses its libraries and runs against its kernels. Theoretically fuzz could be ported to unix using [plan9port](https://github.com/9fans/plan9port), but this would require a Plan 9 kernel in user space which doesn't really exist outside of [9vx](https://swtch.com/9vx/) which is untested in this regard. ## Building mk ## Installing mk install ## Building in debug mode mk debug ## Usage To perform up to round 5 of fuzzing for the read, write, open, and close calls: fuzz -n 5 read write open close A list of all known system call names can be printed: fuzz ? ## Recommended reading for further development - http://doc.cat-v.org/plan_9/4th_edition/papers/comp - http://doc.cat-v.org/plan_9/programming/c_programming_in_plan_9 - https://lsub.org/who/nemo/9.pdf - http://9.postnix.us/hist/3e/plan9_3e_kernel.tgz - http://doc.cat-v.org/plan_9/misc/adding_a_syscall_to_plan_9/plan9_syscall_howto.pdf - http://aiju.de/plan_9/plan9-syscalls - http://man.cat-v.org/9front/2/intro - http://man.cat-v.org/9front/1/syscall - http://mirror.postnix.us/plan9front/sys/src/cmd/syscall/ - http://mirror.postnix.us/plan9front/sys/src/libc/9syscall/ - http://lsub.org/who/nemo/9.intro.pdf - http://fxr.watson.org/fxr/source/?v=PLAN9 ## Known System Call States If not specified, state is known to be working. - Fd2path - exits - abort - Access - Bind - Chdir - Close - Create - Dup - Fork - Rfork - Fauth - Fversion catches bad args, for future work - Mount - Umount - Noted catches that not notified - Open - Fd2path catches that it is getting bad input - Pread catches a general protection violation - Pwrite catches general protect viol - Read catches general protection violation - Readn catches general protection violation - Remove - Sbrk - *sbrk - Oseek - Swek - *seek - Segattach catches general protection violation - Segbrk catches general protection violation - Segdetach catches general protection violation - Segflush catches general protection violation - Segfree catches general protection violation - Semrelease - Semacquire - Sleep - Tsemacquire - Wait - Waitpid - Write catches general protection violation - Rendezvous catches general protection violation - Dirstat - Dirfstat - Getpid - Getppid - Rerrstr - Sysname