[libvirt] [PATCH 3/3] security: Don't remember labels for TPM

[Michal Privoznik]

https://bugzilla.redhat.com/show_bug.cgi?id=1755803

The /dev/tpmN file can be opened only once, as implemented in
drivers/char/tpm/tpm-dev.c:tpm_open() from the kernel's tree. Any
other attempt to open the file fails. And since we're opening the
file ourselves and passing the FD to qemu we will not succeed
opening the file again when locking it for seclabel remembering.

Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
 src/security/security_dac.c     | 18 +++++++++---------
 src/security/security_selinux.c | 10 +++++-----
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/src/security/security_dac.c b/src/security/security_dac.c
index 2733fa664f..347a7a5f63 100644
--- a/src/security/security_dac.c
+++ b/src/security/security_dac.c
@@ -1653,14 +1653,14 @@ virSecurityDACSetTPMFileLabel(virSecurityManagerPtr mgr,
 
     switch (tpm->type) {
     case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
-        ret = virSecurityDACSetChardevLabel(mgr, def,
-                                            &tpm->data.passthrough.source,
-                                            false);
+        ret = virSecurityDACSetChardevLabelHelper(mgr, def,
+                                                  &tpm->data.passthrough.source,
+                                                  false, false);
         break;
     case VIR_DOMAIN_TPM_TYPE_EMULATOR:
-        ret = virSecurityDACSetChardevLabel(mgr, def,
-                                            &tpm->data.emulator.source,
-                                            false);
+        ret = virSecurityDACSetChardevLabelHelper(mgr, def,
+                                                  &tpm->data.emulator.source,
+                                                  false, false);
         break;
     case VIR_DOMAIN_TPM_TYPE_LAST:
         break;
@@ -1679,9 +1679,9 @@ virSecurityDACRestoreTPMFileLabel(virSecurityManagerPtr mgr,
 
     switch (tpm->type) {
     case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
-        ret = virSecurityDACRestoreChardevLabel(mgr, def,
-                                                &tpm->data.passthrough.source,
-                                                false);
+        ret = virSecurityDACRestoreChardevLabelHelper(mgr, def,
+                                                      &tpm->data.passthrough.source,
+                                                      false, false);
         break;
     case VIR_DOMAIN_TPM_TYPE_EMULATOR:
         /* swtpm will have removed the Unix socket upon termination */
diff --git a/src/security/security_selinux.c b/src/security/security_selinux.c
index e3be724a2b..0486bdd6b6 100644
--- a/src/security/security_selinux.c
+++ b/src/security/security_selinux.c
@@ -1682,14 +1682,14 @@ virSecuritySELinuxSetTPMFileLabel(virSecurityManagerPtr mgr,
     switch (tpm->type) {
     case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
         tpmdev = tpm->data.passthrough.source.data.file.path;
-        rc = virSecuritySELinuxSetFilecon(mgr, tpmdev, seclabel->imagelabel, true);
+        rc = virSecuritySELinuxSetFilecon(mgr, tpmdev, seclabel->imagelabel, false);
         if (rc < 0)
             return -1;
 
         if ((cancel_path = virTPMCreateCancelPath(tpmdev)) != NULL) {
             rc = virSecuritySELinuxSetFilecon(mgr,
                                               cancel_path,
-                                              seclabel->imagelabel, true);
+                                              seclabel->imagelabel, false);
             VIR_FREE(cancel_path);
             if (rc < 0) {
                 virSecuritySELinuxRestoreTPMFileLabelInt(mgr, def, tpm);
@@ -1701,7 +1701,7 @@ virSecuritySELinuxSetTPMFileLabel(virSecurityManagerPtr mgr,
         break;
     case VIR_DOMAIN_TPM_TYPE_EMULATOR:
         tpmdev = tpm->data.emulator.source.data.nix.path;
-        rc = virSecuritySELinuxSetFilecon(mgr, tpmdev, seclabel->imagelabel, true);
+        rc = virSecuritySELinuxSetFilecon(mgr, tpmdev, seclabel->imagelabel, false);
         if (rc < 0)
             return -1;
         break;
@@ -1730,10 +1730,10 @@ virSecuritySELinuxRestoreTPMFileLabelInt(virSecurityManagerPtr mgr,
     switch (tpm->type) {
     case VIR_DOMAIN_TPM_TYPE_PASSTHROUGH:
         tpmdev = tpm->data.passthrough.source.data.file.path;
-        rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev, true);
+        rc = virSecuritySELinuxRestoreFileLabel(mgr, tpmdev, false);
 
         if ((cancel_path = virTPMCreateCancelPath(tpmdev)) != NULL) {
-            if (virSecuritySELinuxRestoreFileLabel(mgr, cancel_path, true) < 0)
+            if (virSecuritySELinuxRestoreFileLabel(mgr, cancel_path, false) < 0)
                 rc = -1;
             VIR_FREE(cancel_path);
         }
-- 
2.21.0