tpm_nvdefine (8) - Linux Manuals

NAME

tpm_nvdefine

SYNOPSIS

tpm_nvdefine [OPTIONS]

DESCRIPTION

tpm_nvdefine defines a new NVRAM area at the given index and of given size. The user has to provide the permissions that control access to the NVRAM area.

Owner authentication is necessary once the NVRAM area 0xFFFFFFFF has been defined. The owner password may be provided on the command line using the owner password option.

The following options are supported:

-h, --help

Display command usage info.

-v, --version

Display command version info.

-l, --log [none|error|info|debug]

Set logging level.

-u, --unicode

Use TSS UNICODE encoding for passwords to comply with applications using TSS popup boxes

-y, --owner-well-known

Use a secret of all zeros (20 bytes of zeros) as the owner's secret.

-z, --area-well-known

Use a secret of all zeros (20 bytes of zeros) as the NVRAM area's secret.

-o, --pwdo (optional parameter)

The owner password.

A password may be directly provided for example by using '--pwdo=password' or '-opassword'. If no password is provided with this option then the program will prompt the user for the password.

-a, --pwda (optional parameter)

The NVRAM area password.

A password may be directly provided for example by using '--pwda=password' or '-apassword'. If no password is provided with this option then the program will prompt the user for the password.

-i, --index

The index of the NVRAM area. The parameter must either be a decimal number or a hexadecimal number starting with '0x'.

To select the NVRAM area with index 0x100, the command line parameter should be '-i 0x100' or '--index 0x100'.

-s, --size

The size of the NVRAM area. The parameter must either be a decimal number or a hexadecimal number starting with '0x'.

-p, --permissions

The access permissions associated with the NVRAM area. The parameter must either be a decimal number or a hexadecimal number staring with '0x'. It is possible to logically 'or' numbers or strings. The following strings are supported:

AUTHREAD

Reading requires NVRAM area authorization.

AUTHWRITE

Writing requires NVRAM area authorization.

PPREAD

Reading requires physical presence.

PPWRITE

Writing requires physical presence.

OWNERREAD

Reading requires owner authorization.

OWNERWRITE

Writing requires owner authorization.

GLOBALLOCK

A write to index 0 locks the NVRAM area until the next TPM_Startup(ST_CLEAR)

READ_STCLEAR

A read with size 0 on the same index prevents further reading until the next TPM_Startup(ST_CLEAR)

WRITE_STCLEAR

A write with size 0 to the same index prevents further writing until the next TPM_Startup(ST_CLEAR)

WRITEDEFINE

A write with size 0 to the same index locks the NVRAM area permanently

WRITEALL

The value must be written in a single operation

An example of a permission parameter is:

--permissions=``OWNERREAD|OWNERWRITE''

REPORTING BUGS

Report bugs to <trousers-users [at] lists.sourceforge.net>