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only relabel cri managed host mounts

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Co-authored-by: Samuel Karp <skarp@amazon.com>
Signed-off-by: Michael Crosby <michael@thepasture.io>
Signed-off-by: Samuel Karp <skarp@amazon.com>
This commit is contained in:
Michael Crosby 2021-11-09 19:45:40 +00:00 committed by Samuel Karp
parent 432ddecaae
commit 9b0303913f
No known key found for this signature in database
GPG Key ID: 7F8CDFDD70CC3D44
3 changed files with 57 additions and 67 deletions
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24
pkg/cri/opts/spec_linux.go
View File

@ -224,30 +224,6 @@ func WithMounts(osi osinterface.OS, config *runtime.ContainerConfig, extra []*ru
}
}
const (
etcHosts = "/etc/hosts"
etcHostname = "/etc/hostname"
resolvConfPath = "/etc/resolv.conf"
)
// WithRelabeledContainerMounts relabels the default container mounts for files in /etc
func WithRelabeledContainerMounts(mountLabel string) oci.SpecOpts {
return func(ctx context.Context, client oci.Client, _ *containers.Container, s *runtimespec.Spec) (err error) {
if mountLabel == "" {
return nil
}
for _, m := range s.Mounts {
switch m.Destination {
case etcHosts, etcHostname, resolvConfPath:
if err := label.Relabel(m.Source, mountLabel, false); err != nil {
return err
}
}
}
return nil
}
}
// Ensure mount point on which path is mounted, is shared.
func ensureShared(path string, lookupMount func(string) (mount.Info, error)) error {
mountInfo, err := lookupMount(path)

5
pkg/cri/server/container_create_linux.go
View File

@ -71,6 +71,7 @@ func (c *criService) containerMounts(sandboxID string, config *runtime.Container
ContainerPath: etcHostname,
HostPath: hostpath,
Readonly: securityContext.GetReadonlyRootfs(),
SelinuxRelabel: true,
})
}
}
@ -80,6 +81,7 @@ func (c *criService) containerMounts(sandboxID string, config *runtime.Container
ContainerPath: etcHosts,
HostPath: c.getSandboxHosts(sandboxID),
Readonly: securityContext.GetReadonlyRootfs(),
SelinuxRelabel: true,
})
}
@ -90,6 +92,7 @@ func (c *criService) containerMounts(sandboxID string, config *runtime.Container
ContainerPath: resolvConfPath,
HostPath: c.getResolvPath(sandboxID),
Readonly: securityContext.GetReadonlyRootfs(),
SelinuxRelabel: true,
})
}
@ -192,7 +195,7 @@ func (c *criService) containerSpec(
}
}()
specOpts = append(specOpts, customopts.WithMounts(c.os, config, extraMounts, mountLabel), customopts.WithRelabeledContainerMounts(mountLabel))
specOpts = append(specOpts, customopts.WithMounts(c.os, config, extraMounts, mountLabel))
if !c.config.DisableProcMount {
// Change the default masked/readonly paths to empty slices

11
pkg/cri/server/container_create_linux_test.go
View File

@ -455,16 +455,19 @@ func TestContainerMounts(t *testing.T) {
ContainerPath: "/etc/hostname",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hostname"),
Readonly: true,
SelinuxRelabel: true,
},
{
ContainerPath: "/etc/hosts",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hosts"),
Readonly: true,
SelinuxRelabel: true,
},
{
ContainerPath: resolvConfPath,
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "resolv.conf"),
Readonly: true,
SelinuxRelabel: true,
},
{
ContainerPath: "/dev/shm",
@ -481,16 +484,19 @@ func TestContainerMounts(t *testing.T) {
ContainerPath: "/etc/hostname",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hostname"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: "/etc/hosts",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hosts"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: resolvConfPath,
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "resolv.conf"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: "/dev/shm",
@ -509,16 +515,19 @@ func TestContainerMounts(t *testing.T) {
ContainerPath: "/etc/hostname",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hostname"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: "/etc/hosts",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hosts"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: resolvConfPath,
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "resolv.conf"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: "/dev/shm",
@ -560,11 +569,13 @@ func TestContainerMounts(t *testing.T) {
ContainerPath: "/etc/hosts",
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "hosts"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: resolvConfPath,
HostPath: filepath.Join(testRootDir, sandboxesDir, testSandboxID, "resolv.conf"),
Readonly: false,
SelinuxRelabel: true,
},
{
ContainerPath: "/dev/shm",