Date: Fri, 26 Nov 2004 20:38:00 +0100 From: Koen Martens <fbsd@metro.cx> To: freebsd-hackers@freebsd.org Subject: Jail + sysv shmem Message-ID: <20041126193800.GB11747@metro.cx>
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Hello Hackers,
For a while i've been wanting shared memory to be usable withing jails,
but with cross-jail protection. Ie. shared memory is restricted to a
jail.
Recently I've been digging a bit in the freebsd kernel source code
(which is new to me, been doing quite some linux kernel hacking though).
It looks like this is actually not _that_ difficult to implement.
So, did anyone try this yet? Any pointers?
I think it can be done by putting the jail id in struct ipc_perm (in
sys/ipc.h), and then basically editing sysv_{msg,sem,shm}.c to extend
these checks that are all over there:
if (!jail_sysvipc_allowed && jailed(td->td_ucred))
return (ENOSYS);
Does that sound ok?
Kind regards,
Koen
--
K.F.J. Martens, Sonologic, http://www.sonologic.nl/
Networking, embedded systems, unix expertise, artificial intelligence.
Public PGP key: http://www.metro.cx/pubkey-gmc.asc
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