mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-11-08 18:43:21 +01:00
Nayna Jain
bd5d9c743d
PowerNV secure variables, which store the keys used for OS kernel verification, are managed by the firmware. These secure variables need to be accessed by the userspace for addition/deletion of the certificates. This patch adds the sysfs interface to expose secure variables for PowerNV secureboot. The users shall use this interface for manipulating the keys stored in the secure variables. Signed-off-by: Nayna Jain <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Eric Richter <[email protected]> Signed-off-by: Michael Ellerman <[email protected]> Link: https://lore.kernel.org/r/[email protected]
47 lines
1.8 KiB
Plaintext
47 lines
1.8 KiB
Plaintext
What: /sys/firmware/secvar
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: This directory is created if the POWER firmware supports OS
|
|
secureboot, thereby secure variables. It exposes interface
|
|
for reading/writing the secure variables
|
|
|
|
What: /sys/firmware/secvar/vars
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: This directory lists all the secure variables that are supported
|
|
by the firmware.
|
|
|
|
What: /sys/firmware/secvar/format
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: A string indicating which backend is in use by the firmware.
|
|
This determines the format of the variable and the accepted
|
|
format of variable updates.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable name>
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: Each secure variable is represented as a directory named as
|
|
<variable_name>. The variable name is unique and is in ASCII
|
|
representation. The data and size can be determined by reading
|
|
their respective attribute files.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/size
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: An integer representation of the size of the content of the
|
|
variable. In other words, it represents the size of the data.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/data
|
|
Date: August 2019
|
|
Contact: Nayna Jain h<[email protected]>
|
|
Description: A read-only file containing the value of the variable. The size
|
|
of the file represents the maximum size of the variable data.
|
|
|
|
What: /sys/firmware/secvar/vars/<variable_name>/update
|
|
Date: August 2019
|
|
Contact: Nayna Jain <[email protected]>
|
|
Description: A write-only file that is used to submit the new value for the
|
|
variable. The size of the file represents the maximum size of
|
|
the variable data that can be written.
|