RE: how to deny reading of several sysctls (for a set of uids, f.e.)


Is there a documented possibility to use syscalls _inside_
kernel code?
In other words, I need to call the function located in
loadable kernel object from kernel, doesn't matter how
this would be done (syscall, etc).


Hi Andrew,

You can redirect syscalls to another function with loadable kernel modules.


Some documentation/examples you might want to read first:

/usr/share/examples/kld
http://www.r4k.net/mod/fbsdfun.html
http://packetstormsecurity.org/papers/unix/bsdkern.htm
http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/driverbasics-
kld.html



With best regards,

Thijs Eilander




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