"Serge E. Hallyn" [off-list ref] writes:
On Thu, Dec 08, 2016 at 05:43:09PM +1300, Eric W. Biederman wrote:
quoted
"Serge E. Hallyn" [off-list ref] writes:
quoted
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.
Any chance of a singed-off-by?
Yes, sorry, Stéphane had pointed out that I'd apparently forgotten to do
-s. Do you want me to resend the whole shebang, or does
Signed-off-by: Serge Hallyn <redacted>
suffice? (My previous iterations did have it fwiw so I don't think I could
legally disavow it now :)
That should be good enough. I just wanted to make certain it existed
somewhere.
The whole inode->i_op->getxattr reference was also a bit of a problem
as that method was removed in 4.9-rc1 but otherwise things are looking
reasonable.
Thank you,
Eric