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libpod: always use direct mapping 

always use the direct mapping when writing the mappings for an
idmapped mount.  crun was previously using the reverse mapping, which
is not correct and it is being addressed here:

https://github.com/containers/crun/pull/1147

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
This commit is contained in:
Giuseppe Scrivano 2023-02-20 14:05:04 +01:00
parent b55df7f151
commit af8d649da7
No known key found for this signature in database
GPG Key ID: 67E38F7A8BA21772
4 changed files with 30 additions and 44 deletions
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2
libpod/container_internal.go
View File

@ -1525,7 +1525,7 @@ func (c *Container) mountStorage() (_ string, deferredErr error) {
mountPoint := c.config.Rootfs
if c.config.RootfsMapping != nil {
uidMappings, gidMappings, err := parseIDMapMountOption(c.config.IDMappings, *c.config.RootfsMapping, false)
uidMappings, gidMappings, err := parseIDMapMountOption(c.config.IDMappings, *c.config.RootfsMapping)
if err != nil {
return "", err
}

36
libpod/container_internal_common.go
View File

@ -74,7 +74,7 @@ func parseOptionIDs(option string) ([]idtools.IDMap, error) {
return ret, nil
}
func parseIDMapMountOption(idMappings stypes.IDMappingOptions, option string, invert bool) ([]spec.LinuxIDMapping, []spec.LinuxIDMapping, error) {
func parseIDMapMountOption(idMappings stypes.IDMappingOptions, option string) ([]spec.LinuxIDMapping, []spec.LinuxIDMapping, error) {
uidMap := idMappings.UIDMap
gidMap := idMappings.GIDMap
if strings.HasPrefix(option, "idmap=") {
@ -101,33 +101,17 @@ func parseIDMapMountOption(idMappings stypes.IDMappingOptions, option string, in
uidMappings := make([]spec.LinuxIDMapping, len(uidMap))
gidMappings := make([]spec.LinuxIDMapping, len(gidMap))
for i, uidmap := range uidMap {
if invert {
uidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(uidmap.ContainerID),
ContainerID: uint32(uidmap.HostID),
Size: uint32(uidmap.Size),
}
} else {
uidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(uidmap.HostID),
ContainerID: uint32(uidmap.ContainerID),
Size: uint32(uidmap.Size),
}
uidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(uidmap.HostID),
ContainerID: uint32(uidmap.ContainerID),
Size: uint32(uidmap.Size),
}
}
for i, gidmap := range gidMap {
if invert {
gidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(gidmap.ContainerID),
ContainerID: uint32(gidmap.HostID),
Size: uint32(gidmap.Size),
}
} else {
gidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(gidmap.HostID),
ContainerID: uint32(gidmap.ContainerID),
Size: uint32(gidmap.Size),
}
gidMappings[i] = spec.LinuxIDMapping{
HostID: uint32(gidmap.HostID),
ContainerID: uint32(gidmap.ContainerID),
Size: uint32(gidmap.Size),
}
}
return uidMappings, gidMappings, nil
@ -304,7 +288,7 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
for _, o := range m.Options {
if o == "idmap" || strings.HasPrefix(o, "idmap=") {
var err error
m.UIDMappings, m.GIDMappings, err = parseIDMapMountOption(c.config.IDMappings, o, true)
m.UIDMappings, m.GIDMappings, err = parseIDMapMountOption(c.config.IDMappings, o)
if err != nil {
return nil, err
}

34
libpod/container_internal_test.go
View File

@ -65,49 +65,49 @@ func TestParseIDMapMountOption(t *testing.T) {
UIDMap: uidMap,
GIDMap: gidMap,
}
uids, gids, err := parseIDMapMountOption(options, "idmap", true)
uids, gids, err := parseIDMapMountOption(options, "idmap")
assert.Nil(t, err)
assert.Equal(t, len(uids), 1)
assert.Equal(t, len(gids), 1)
assert.Equal(t, uids[0].ContainerID, uint32(1000))
assert.Equal(t, uids[0].HostID, uint32(0))
assert.Equal(t, uids[0].HostID, uint32(1000))
assert.Equal(t, uids[0].ContainerID, uint32(0))
assert.Equal(t, uids[0].Size, uint32(10000))
assert.Equal(t, gids[0].ContainerID, uint32(2000))
assert.Equal(t, gids[0].HostID, uint32(0))
assert.Equal(t, gids[0].HostID, uint32(2000))
assert.Equal(t, gids[0].ContainerID, uint32(0))
assert.Equal(t, gids[0].Size, uint32(10000))
uids, gids, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10", true)
uids, gids, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10")
assert.Nil(t, err)
assert.Equal(t, len(uids), 2)
assert.Equal(t, len(gids), 1)
assert.Equal(t, uids[0].ContainerID, uint32(1))
assert.Equal(t, uids[0].HostID, uint32(0))
assert.Equal(t, uids[0].HostID, uint32(1))
assert.Equal(t, uids[0].ContainerID, uint32(0))
assert.Equal(t, uids[0].Size, uint32(10))
assert.Equal(t, uids[1].ContainerID, uint32(11))
assert.Equal(t, uids[1].HostID, uint32(10))
assert.Equal(t, uids[1].HostID, uint32(11))
assert.Equal(t, uids[1].ContainerID, uint32(10))
assert.Equal(t, uids[1].Size, uint32(10))
assert.Equal(t, gids[0].ContainerID, uint32(3))
assert.Equal(t, gids[0].HostID, uint32(0))
assert.Equal(t, gids[0].HostID, uint32(3))
assert.Equal(t, gids[0].ContainerID, uint32(0))
assert.Equal(t, gids[0].Size, uint32(10))
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10;foobar=bar", true)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10;foobar=bar")
assert.NotNil(t, err)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0-12", true)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0-12")
assert.NotNil(t, err)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0-12--12", true)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0-12--12")
assert.NotNil(t, err)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#-1-12-12", true)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#-1-12-12")
assert.NotNil(t, err)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0--12-0", true)
_, _, err = parseIDMapMountOption(options, "idmap=uids=0-1-10#10-11-10;gids=0-3-10#0--12-0")
assert.NotNil(t, err)
}

2
test/e2e/run_userns_test.go
View File

@ -109,6 +109,8 @@ var _ = Describe("Podman UserNS support", func() {
})
It("podman uidmapping and gidmapping with an idmapped volume", func() {
Skip("it depends on a breaking change in crun: https://github.com/containers/crun/pull/1147")
session := podmanTest.Podman([]string{"run", "--uidmap=0:1:500", "--gidmap=0:200:5000", "-v", "my-foo-volume:/foo:Z,idmap", "alpine", "stat", "-c", "#%u:%g#", "/foo"})
session.WaitWithDefaultTimeout()
if strings.Contains(session.ErrorToString(), "Operation not permitted") {