On Thu, May 20, 2021 at 10:56:57AM +0200, Roberto Sassu wrote: > This patch introduces the new template fields mntuidmap and mntgidmap, > which include respectively the UID and GID mappings of the idmapped mount, > if the user namespace is not the initial one. > > These template fields, which should be included whenever the iuid and the > igid fields are included, allow remote verifiers to find the original UID > and GID of the inode during signature verification. The iuid and igid > fields include the mapped UID and GID when the inode is in an idmapped > mount. > > This solution has been preferred to providing always the original UID and > GID, regardless of whether the inode is in an idmapped mount or not, as > the mapped UID and GID are those seen by processes and matched with the IMA > policy. Hm, looking at the code this doesn't seem like a good idea to me. I think we should avoid that and just rely on the original uid and gid.
