[libvirt] [PATCH] security: dac: relabel spice rendernode

[Cole Robinson]

For a logged in user this a path like /dev/dri/renderD128 will have
default ownership root:video which won't work for the qemu:qemu user,
so we need to chown it.

Thankfully with the namespace work we don't need to worry about this
shutting out other legitimate users

https://bugzilla.redhat.com/show_bug.cgi?id=1460804
Signed-off-by: Cole Robinson <crobinso at redhat.com>
---
Sidenote: Not sure about security_selinux changes... Fedora selinux policy
doesn't require relabeling /dev/dri/* nowadays so it isn't required to get
qemu to startup, and infact will probably cause issues for qemu:///session
and non-namespace qemu:///system

 src/security/security_dac.c | 61 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/src/security/security_dac.c b/src/security/security_dac.c
index ca7a6af6d..4c86e5fe8 100644
--- a/src/security/security_dac.c
+++ b/src/security/security_dac.c
@@ -1371,6 +1371,57 @@ virSecurityDACRestoreTPMFileLabel(virSecurityManagerPtr mgr,
 
 
 static int
+virSecurityDACSetGraphicsLabel(virSecurityManagerPtr mgr,
+                               virDomainDefPtr def,
+                               virDomainGraphicsDefPtr gfx)
+
+{
+    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
+    virSecurityLabelDefPtr seclabel;
+    uid_t user;
+    gid_t group;
+
+    seclabel = virDomainDefGetSecurityLabelDef(def, SECURITY_DAC_NAME);
+    if (seclabel && !seclabel->relabel)
+        return 0;
+
+    if (virSecurityDACGetIds(seclabel, priv, &user, &group, NULL, NULL) < 0)
+        return -1;
+
+    if (gfx->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE &&
+        gfx->data.spice.gl == VIR_TRISTATE_BOOL_YES &&
+        gfx->data.spice.rendernode) {
+        if (virSecurityDACSetOwnership(priv, NULL,
+                                       gfx->data.spice.rendernode,
+                                       user, group) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+
+static int
+virSecurityDACRestoreGraphicsLabel(virSecurityManagerPtr mgr,
+                               virDomainDefPtr def ATTRIBUTE_UNUSED,
+                               virDomainGraphicsDefPtr gfx)
+
+{
+    virSecurityDACDataPtr priv = virSecurityManagerGetPrivateData(mgr);
+
+    if (gfx->type == VIR_DOMAIN_GRAPHICS_TYPE_SPICE &&
+        gfx->data.spice.gl == VIR_TRISTATE_BOOL_YES &&
+        gfx->data.spice.rendernode) {
+        if (virSecurityDACRestoreFileLabel(priv,
+                                           gfx->data.spice.rendernode) < 0)
+            return -1;
+    }
+
+    return 0;
+}
+
+
+static int
 virSecurityDACSetInputLabel(virSecurityManagerPtr mgr,
                             virDomainDefPtr def,
                             virDomainInputDefPtr input)
@@ -1481,6 +1532,11 @@ virSecurityDACRestoreAllLabel(virSecurityManagerPtr mgr,
             rc = -1;
     }
 
+    for (i = 0; i < def->ngraphics; i++) {
+        if (virSecurityDACRestoreGraphicsLabel(mgr, def, def->graphics[i]) < 0)
+            return -1;
+    }
+
     for (i = 0; i < def->ninputs; i++) {
         if (virSecurityDACRestoreInputLabel(mgr, def, def->inputs[i]) < 0)
             rc = -1;
@@ -1601,6 +1657,11 @@ virSecurityDACSetAllLabel(virSecurityManagerPtr mgr,
             return -1;
     }
 
+    for (i = 0; i < def->ngraphics; i++) {
+        if (virSecurityDACSetGraphicsLabel(mgr, def, def->graphics[i]) < 0)
+            return -1;
+    }
+
     for (i = 0; i < def->ninputs; i++) {
         if (virSecurityDACSetInputLabel(mgr, def, def->inputs[i]) < 0)
             return -1;
-- 
2.13.3