tree 63c798092069c235a478e69ab935f96ed3711e86
parent c1717701be2f0639e5f817385a524131dbd3ff38
author Serge Hallyn <serge.hallyn@ubuntu.com> 1456790975 +0000
committer Serge Hallyn <serge@hallyn.com> 1479505961 -0600

user-namespaced file capabilities - now with even more magic

Root in a user ns cannot be trusted to write a traditional
security.capability xattr.  If it were allowed to do so, then any
unprivileged user on the host could map his own uid to root in a
namespace, write the xattr, and execute the file with privilege on the
host.

This patch introduces v3 of the security.capability xattr.  It builds a
vfs_ns_cap_data struct by appending a uid_t rootid to struct
vfs_cap_data.  This is the absolute uid_t (i.e. the uid_t in
init_user_ns) of the root id (uid 0 in a namespace) in whose namespaces
the file capabilities may take effect.

When a task in a user ns (which is privileged with CAP_SETFCAP toward
that user_ns) asks to write v2 security.capability, the kernel will
transparently rewrite the xattr as a v3 with the appropriate rootid.
Subsequently, any task executing the file which has the noted kuid as
its root uid, or which is in a descendent user_ns of such a user_ns,
will run the file with capabilities.

If a task writes a v3 security.capability, then it can provide a
uid (valid within its own user namespace, over which it has CAP_SETFCAP)
for the xattr.  The kernel will translate that to the absolute uid, and
write that to disk.  After this, a task in the writer's namespace will
not be able to use those capabilities, but a task in a namespace where
the given uid is root will.

Only a single security.capability xattr may be written.  A task may
overwrite the existing one so long as it was written by a user mapped
into his own user_ns over which he has CAP_SETFCAP.

This allows a simple setxattr to work, allows tar/untar to work, and
allows us to tar in one namespace and untar in another while preserving
the capability, without risking leaking privilege into a parent
namespace.

Changelog:
   Nov 02 2016: fix invalid check at refuse_fcap_overwrite()
   Nov 07 2016: convert rootid from and to fs user_ns