[Devel] Re: CAP_SYS_ADMIN on restart(2)

[Serge E. Hallyn]

Quoting Alexey Dobriyan (adobriyan at gmail.com):
> > What Alexey wants, I believe, is for users to be able to not have
> > to worry about there being exploitable bugs in restart(2) which
> > unprivileged users can play with.  And for the usual distro-kernel
> > reasons, saying use 'CONFIG_CHECKPOINT=n' is not an option.
> 
> This is correct, yes. If I would be a sysadmin who knows a bit about
> kernel internals, I'd never trust restart(2) to get it right.

Now I suppose what we could do is define a new CAP_SYS_RESTART
capability and require that.  Then the admin to whom I'm trying
to cater could simply 'capset cap_sys_restart=pe /bin/restart'.
Then all users could use restart without being granted the
extra privilege implied by CAP_SYS_ADMIN.

-serge
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