Unable to Use /dev/tpm0 as RNG for rngd

Solution Verified - Updated -

Issue

  • On a system with TPM enabled I am unable to start rngd with /dev/tpm0 as a random number generator. 
# cat /etc/redhat-release 
Red Hat Enterprise Linux Server release 5.8 (Tikanga)
# ls -la /dev/tpm0 
crw------- 1 root root 10, 224 Jan 20 17:55 /dev/tpm0
# lsmod|grep tpm
tpm_tis                48077  1 
tpm                    50273  1 tpm_tis
tpm_bios               40897  1 tpm
# rngd -f
can't open entropy source(tpm or intel/amd rng)
Maybe RNG device modules are not loaded

Environment

  • Red Hat Enterprise Linux, version 5
  • Dell PowerEdge R815 with Trusted Platform Module (TPM) enabled

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