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rootless: support keep-id with one mapping 

support using keep-id when only one mapping is available to the
rootless user.

When there is only one id available (e.g. there are no additional IDs
set in /etc/subuid and /etc/subgid for the unprivileged user), then
only add the identity mapping $ID -> $ID, leaving unmapped other IDs
in the user namespace.

[NO NEW TESTS NEEDED] it needs a configuration with only one ID
available.

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2022-10-27 11:29:23 +02:00
parent 5dad34212f
commit 83313c547c
No known key found for this signature in database
GPG Key ID: 67E38F7A8BA21772
1 changed files with 8 additions and 6 deletions
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10
pkg/util/utils.go
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@ -366,13 +366,11 @@ func GetKeepIDMapping(opts *namespaces.KeepIDUserNsOptions) (*stypes.IDMappingOp
gid = int(*opts.GID)
}
uids, gids, err := rootless.GetConfiguredMappings(false)
uids, gids, err := rootless.GetConfiguredMappings(true)
if err != nil {
return nil, -1, -1, fmt.Errorf("cannot read mappings: %w", err)
}
if len(uids) == 0 || len(gids) == 0 {
return nil, -1, -1, fmt.Errorf("keep-id requires additional UIDs or GIDs defined in /etc/subuid and /etc/subgid to function correctly: %w", err)
}
maxUID, maxGID := 0, 0
for _, u := range uids {
maxUID += u.Size
@ -383,13 +381,17 @@ func GetKeepIDMapping(opts *namespaces.KeepIDUserNsOptions) (*stypes.IDMappingOp
options.UIDMap, options.GIDMap = nil, nil
if len(uids) > 0 {
options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(uid, maxUID)})
}
options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid, HostID: 0, Size: 1})
if maxUID > uid {
options.UIDMap = append(options.UIDMap, idtools.IDMap{ContainerID: uid + 1, HostID: uid + 1, Size: maxUID - uid})
}
if len(gids) > 0 {
options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: 0, HostID: 1, Size: min(gid, maxGID)})
}
options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid, HostID: 0, Size: 1})
if maxGID > gid {
options.GIDMap = append(options.GIDMap, idtools.IDMap{ContainerID: gid + 1, HostID: gid + 1, Size: maxGID - gid})