From: Daniel P. Berrange <berrange@redhat.com>
Date: Tue, 22 Feb 2011 13:09:19 +0000 (+0000)
Subject: Expose name + UUID to LXC containers via env variables
X-Git-Tag: CVE-2011-1146~106
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6704e3fdb3af345fdaed68f7db88e0ef8ca6fc97;p=thirdparty%2Flibvirt.git

Expose name + UUID to LXC containers via env variables

When spawning 'init' in the container, set

  LIBVIRT_LXC_UUID=XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
  LIBVIRT_LXC_NAME=YYYYYYYYYYYY

to allow guest software to detect & identify that they
are in a container

* src/lxc/lxc_container.c: Set LIBVIRT_LXC_UUID and
  LIBVIRT_LXC_NAME env vars
---

diff --git a/src/lxc/lxc_container.c b/src/lxc/lxc_container.c
index d973984565..269dc9784a 100644
--- a/src/lxc/lxc_container.c
+++ b/src/lxc/lxc_container.c
@@ -52,6 +52,7 @@
 #include "util.h"
 #include "memory.h"
 #include "veth.h"
+#include "uuid.h"
 #include "files.h"
 
 #define VIR_FROM_THIS VIR_FROM_LXC
@@ -102,6 +103,20 @@ struct __lxc_child_argv {
  */
 static int lxcContainerExecInit(virDomainDefPtr vmDef)
 {
+    char *uuidenv, *nameenv;
+    char uuidstr[VIR_UUID_STRING_BUFLEN];
+
+    virUUIDFormat(vmDef->uuid, uuidstr);
+
+    if (virAsprintf(&uuidenv, "LIBVIRT_LXC_UUID=%s", uuidstr) < 0) {
+        virReportOOMError();
+        return -1;
+    }
+    if (virAsprintf(&nameenv, "LIBVIRT_LXC_NAME=%s", vmDef->name) < 0) {
+        virReportOOMError();
+        return -1;
+    }
+
     const char *const argv[] = {
         vmDef->os.init,
         NULL,
@@ -109,6 +124,8 @@ static int lxcContainerExecInit(virDomainDefPtr vmDef)
     const char *const envp[] = {
         "PATH=/bin:/sbin",
         "TERM=linux",
+        uuidenv,
+        nameenv,
         NULL,
     };