Re: [GIT PULL] kdbus for 4.1-rc1

Matthew Garrett
2015-04-21T19:39:18Z

On Tue, Apr 21, 2015 at 11:36:54AM -0500, Eric W. Biederman wrote:
>
> HeHeHe. You mean all I need to do to get around all of the logging servers is
> capture CAP_SYS_BOOT? Say like just capture this crazy watchdog program
> that doesn't run as root so that it can only reboot the system? HeHeHe
> So I can just trigger a clean reboot wait for journald, auditd, and
> syslog all to shut down and then do evil things to the machine without
> having to worry about erasing forensic evidence?

CAP_SYS_BOOT gives you kexec, and kexec with init=/bin/sh lets you do
anything. You added that in dc009d92435f99498cbc579ce76bf28e837e2c14 and
now the horse is long gone. Don't give CAP_SYS_BOOT to anything you
don't trust with full privileges.

--
Matthew Garrett | mjg59@srcf.ucam.org