On Mon, Dec 08, 2014 at 02:23:06PM -0800, Linus Torvalds wrote: > On Mon, Dec 8, 2014 at 2:14 PM, Theodore Ts'o <tytso@xxxxxxx> wrote: > > > > running trinity as root should be quite safe in a VM. :-) > > It's not so much the safety that I'd worry about, it's the "you can > legitimately just reboot it or cause kernel corruption as root". You > may not cause any problems outside of the VM, but any oopses inside > the VM might be due to trinity just doing bad things as root, rather > than kernel bugs.. > > Of course, it's probably hard to hit things like laoding random > modules etc, since even without signature requirements there are tons > of ELF sanity checks and other things. So it might be hard to actually > do those kinds of "corrupt kernel memory as root" things with trinity. It also goes out of its way to avoid doing obviously stupid things, like using /dev/mem as an fd, plus a whole bunch of similar sysfs/procfs knobs. There are still likely a whole bunch of similar things that might have horrible effects too. It's been on my todo for a while to revisit that particular case and blacklist a bunch of other things. And then there's obviously "don't do this syscall, ever" or "with these args" type things, which could use expanding.. It's a big effort tbh. I'm amazed that Sasha, Kirill and everyone else running it as root in vm's aren't buried alive in false-positives. Dave -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
