[PATCH 6/6] qemuSecurityDomainRestorePathLabel: Introduce @ignoreNS argument

[Michal Privoznik <mprivozn@xxxxxxxxxx>]

In a few cases we might set seclabels on a path outside of
namespaces. For instance, when restoring a domain from a file,
the file is opened, relabelled and only then the namespace is
created and the FD is passed to QEMU (see v6.3.0-rc1~108 for more
info). Therefore, when restoring the label on the restore file,
we must ignore domain namespaces and restore the label directly
in the host.

This bug demonstrates itself when restoring a domain from a block
device. We don't create the block device inside the domain
namespace and thus the following error is reported at the end of
(otherwise successful) restore:

error : virProcessRunInFork:1236 : internal error: child reported (status=125): unable to stat: /dev/sda: No such file or directory
error : virProcessRunInFork:1240 : unable to stat: /dev/sda: No such file or directory

Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx>
---
 src/qemu/qemu_driver.c   | 2 +-
 src/qemu/qemu_security.c | 6 ++++--
 src/qemu/qemu_security.h | 3 ++-
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 80648f1d32..4f62b5c838 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6953,7 +6953,7 @@ qemuDomainSaveImageStartVM(virConnectPtr conn,
         qemuProcessStop(driver, vm, VIR_DOMAIN_SHUTOFF_FAILED,
                         asyncJob, VIR_QEMU_PROCESS_STOP_MIGRATED);
     }
-    if (qemuSecurityDomainRestorePathLabel(driver, vm, path) < 0)
+    if (qemuSecurityDomainRestorePathLabel(driver, vm, path, true) < 0)
         VIR_WARN("failed to restore save state label on %s", path);
     return ret;
 }
diff --git a/src/qemu/qemu_security.c b/src/qemu/qemu_security.c
index 98f973ab12..f49c0890f2 100644
--- a/src/qemu/qemu_security.c
+++ b/src/qemu/qemu_security.c
@@ -617,13 +617,15 @@ qemuSecurityDomainSetPathLabel(virQEMUDriverPtr driver,
 int
 qemuSecurityDomainRestorePathLabel(virQEMUDriverPtr driver,
                                    virDomainObjPtr vm,
-                                   const char *path)
+                                   const char *path,
+                                   bool ignoreNS)
 {
     qemuDomainObjPrivatePtr priv = vm->privateData;
     pid_t pid = -1;
     int ret = -1;
 
-    if (qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
+    if (!ignoreNS &&
+        qemuDomainNamespaceEnabled(vm, QEMU_DOMAIN_NS_MOUNT))
         pid = vm->pid;
 
     if (virSecurityManagerTransactionStart(driver->securityManager) < 0)
diff --git a/src/qemu/qemu_security.h b/src/qemu/qemu_security.h
index ed6b762662..df34820af8 100644
--- a/src/qemu/qemu_security.h
+++ b/src/qemu/qemu_security.h
@@ -103,7 +103,8 @@ int qemuSecurityDomainSetPathLabel(virQEMUDriverPtr driver,
 
 int qemuSecurityDomainRestorePathLabel(virQEMUDriverPtr driver,
                                        virDomainObjPtr vm,
-                                       const char *path);
+                                       const char *path,
+                                       bool ignoreNS);
 
 int qemuSecurityCommandRun(virQEMUDriverPtr driver,
                            virDomainObjPtr vm,
-- 
2.26.2