tpm2-util: Check for dlopen() when calculating tpm2 support

src/shared/tpm2-util.c

@@ -4195,6 +4195,10 @@ Tpm2Support tpm2_support(void) {
 
 #if HAVE_TPM2
         support |= TPM2_SUPPORT_SYSTEM;
+
+        r = dlopen_tpm2();
+        if (r >= 0)
+                support |= TPM2_SUPPORT_LIBRARIES;
 #endif
 
         return support;

src/shared/tpm2-util.h

@@ -183,7 +183,8 @@ typedef enum Tpm2Support {
         TPM2_SUPPORT_DRIVER    = 1 << 1,  /* the kernel has a driver loaded for it */
         TPM2_SUPPORT_SYSTEM    = 1 << 2,  /* we support it ourselves */
         TPM2_SUPPORT_SUBSYSTEM = 1 << 3,  /* the kernel has the tpm subsystem enabled */
-        TPM2_SUPPORT_FULL      = TPM2_SUPPORT_FIRMWARE|TPM2_SUPPORT_DRIVER|TPM2_SUPPORT_SYSTEM|TPM2_SUPPORT_SUBSYSTEM,
+        TPM2_SUPPORT_LIBRARIES = 1 << 4,  /* we can dlopen the tpm2 libraries */
+        TPM2_SUPPORT_FULL      = TPM2_SUPPORT_FIRMWARE|TPM2_SUPPORT_DRIVER|TPM2_SUPPORT_SYSTEM|TPM2_SUPPORT_SUBSYSTEM|TPM2_SUPPORT_LIBRARIES,
 } Tpm2Support;
 
 enum {