From: Frederick Gotham <cauldwell.tho...@gmail.com>
To: openssl-users@openssl.org
Date: 11/07/2019 10:39 AM
Subject: [EXTERNAL] Re: SOLVED: Force use of engine all the time
Sent by: "openssl-users" <openssl-users-boun...@openssl.org>
Frederick Gotham wrote:
> I don't think any code other than "libcrypto.so" is using the TPM2, and
so
> I don't know why I'm getting "device or resource busy" (considering I'm
> using a global named mutex)". I see that there's also a TPM2 tcti called
> "abrmd", and I'm not sure if this purpose is exactly what it's for.
Just FYI, abrmd was a TPM 2.0 user space resource manager, similar to the
TPM 1.2 tcsd. Recent Linux kernels have a kernel driver resource manager
at /dev/tpmrm0 that removes the need for a user space daemon.
/dev/tpmrm0 supports multiple opens and does the swapping and
scheduling. /dev/tpm0 is the original single open entry point, and
would not normally be used.
