[tpm2] how can i use abrmd/tpmrm0 with tpm2-tools

[tpm2] how can i use abrmd/tpmrm0 with tpm2-tools

[Petko Manolov]

[-- Attachment #1: Type: text/plain, Size: 976 bytes --]

	Hey guys,

I'm on Debian testing (tpm2-abrmd version 2.0.3, tpm2-tools 3.1.3, kernel 
v4.19.8) and no matter how i play with environment variables i can't get the 
tpm2_xxx to talk to the abrm daemon.  Since this kernel has builtin RM i assume 
there might be a collision between the userspace and kernel implementations.

I ran into this issue as my script's 'tpm2_load' runs out of memory (error 
0x902).  Running "tpm2-abrmd -f --allow-root" doesn't complain but:

# tpm2_takeownership -c
ERROR:tcti:src/tss2-tcti/tcti-device.c:319:Tss2_Tcti_Device_Init() Failed to open device file /dev/tpm0: Device or resource busy
ERROR: tcti init allocation routine failed for library: "device" options: "(null)"
ERROR: Could not load tcti, got: "device"

How do i tell tpm2_xxx to use the userspace daemon instead of /dev/tpm0?

I'd like to apologize if this has been answered before.  If that's the case 
please point me to the corresponding thread.


		Petko

Re: [tpm2] how can i use abrmd/tpmrm0 with tpm2-tools

[Tadeusz Struk]

[-- Attachment #1: Type: text/plain, Size: 650 bytes --]

On 12/12/18 7:45 AM, Petko Manolov wrote:
> # tpm2_takeownership -c
> ERROR:tcti:src/tss2-tcti/tcti-device.c:319:Tss2_Tcti_Device_Init() Failed to open device file /dev/tpm0: Device or resource busy
> ERROR: tcti init allocation routine failed for library: "device" options: "(null)"
> ERROR: Could not load tcti, got: "device"
> 
> How do i tell tpm2_xxx to use the userspace daemon instead of /dev/tpm0?
> 
> I'd like to apologize if this has been answered before.  If that's the case 
> please point me to the corresponding thread.

Try 'man tpm2_takeownership' and find the TCTI ENVIRONMENT and TCTI OPTIONS sections.

-- 
Tadeusz