commit ae53e5d10e434e07079d7e3ba11ec654ba6a256e
Author: Daniel P. Berrange <berrange@redhat.com>
Date:   Wed Oct 9 10:52:39 2013 +0100

    Add helpers for getting env vars in a setuid environment
    
    Care must be taken accessing env variables when running
    setuid. Introduce a virGetEnvAllowSUID for env vars which
    are safe to use in a setuid environment, and another
    virGetEnvBlockSUID for vars which are not safe. Also add
    a virIsSUID helper method for any other non-env var code
    to use.
    
    Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

Index: libvirt-1.1.2/src/libvirt_private.syms
===================================================================
--- libvirt-1.1.2.orig/src/libvirt_private.syms
+++ libvirt-1.1.2/src/libvirt_private.syms
@@ -2042,6 +2042,8 @@ virFindFCHostCapableVport;
 virFormatIntDecimal;
 virGetDeviceID;
 virGetDeviceUnprivSGIO;
+virGetEnvAllowSUID;
+virGetEnvBlockSUID;
 virGetFCHostNameByWWN;
 virGetGroupID;
 virGetGroupList;
@@ -2060,6 +2062,7 @@ virIndexToDiskName;
 virIsCapableFCHost;
 virIsCapableVport;
 virIsDevMapperDevice;
+virIsSUID;
 virManageVport;
 virParseNumber;
 virParseOwnershipIds;
Index: libvirt-1.1.2/src/util/virutil.c
===================================================================
--- libvirt-1.1.2.orig/src/util/virutil.c
+++ libvirt-1.1.2/src/util/virutil.c
@@ -2116,3 +2116,42 @@ cleanup:
 
     return rc;
 }
+
+
+/**
+ * virGetEnvBlockSUID:
+ * @name: the environment variable name
+ *
+ * Obtain an environment variable which is unsafe to
+ * use when running setuid. If running setuid, a NULL
+ * value will be returned
+ */
+const char *virGetEnvBlockSUID(const char *name)
+{
+    return secure_getenv(name);
+}
+
+
+/**
+ * virGetEnvBlockSUID:
+ * @name: the environment variable name
+ *
+ * Obtain an environment variable which is safe to
+ * use when running setuid. The value will be returned
+ * even when running setuid
+ */
+const char *virGetEnvAllowSUID(const char *name)
+{
+    return getenv(name);
+}
+
+
+/**
+ * virIsSUID:
+ * Return a true value if running setuid. Does not
+ * check for elevated capabilities bits.
+ */
+bool virIsSUID(void)
+{
+    return getuid() != geteuid();
+}
Index: libvirt-1.1.2/src/util/virutil.h
===================================================================
--- libvirt-1.1.2.orig/src/util/virutil.h
+++ libvirt-1.1.2/src/util/virutil.h
@@ -172,4 +172,8 @@ int virCompareLimitUlong(unsigned long l
 
 int virParseOwnershipIds(const char *label, uid_t *uidPtr, gid_t *gidPtr);
 
+const char *virGetEnvBlockSUID(const char *name);
+const char *virGetEnvAllowSUID(const char *name);
+bool virIsSUID(void);
+
 #endif /* __VIR_UTIL_H__ */