Granting a capability to a service

Andrew Lutomirski luto at
Mon Jul 20 17:30:16 UTC 2015

On Jul 20, 2015 4:20 AM, "Florian Weimer" <fweimer at> wrote:
> On 07/18/2015 03:53 PM, Andrew Lutomirski wrote:
> > Nothing.  Inheritable capabilities are nearly useless.
> Wow.
> The program that sparked this thread is a Go program.  So basically, we
> have these options if we do not want to run with full capabilities:
> (a) Run with UID=0 with restricted capabilities, like many systemd
> services already do.  Do not use fscaps (which are not needed because of
> the UID=0 special case).  This is rather pointless because UID=0 does
> not need capabilities to compromise the system.
> (b) Make a copy of the file, put it in a directory which only the
> service user can read (or ship it with 750 permissions and the service
> group controlling it), and set fscaps.  The downside is the large binary
> size (it has to be a copy, a link won't work).  And the service user
> could still run the service with command line options that allow
> privilege escalation.

If you set inheritable fscaps but not permitted, this should be reasonably

Alas, you will have to remove fscaps entirely to be compatible with ambient


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