diff options
| author | David Brazdil <dbrazdil@google.com> | 2022-01-27 02:12:37 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-02-04 18:45:39 +0300 |
| commit | f396ededbd8bf5911d588b683a3ce335844b7c89 (patch) | |
| tree | e19c606826a5eb3338e3b3dcc7d0a8a383ffaad9 /drivers/misc/Kconfig | |
| parent | c194a38675eac13862ecb51d8a443a566fed97d4 (diff) | |
| download | linux-f396ededbd8bf5911d588b683a3ce335844b7c89.tar.xz | |
misc: open-dice: Add driver to expose DICE data to userspace
Open Profile for DICE is an open protocol for measured boot compatible
with the Trusted Computing Group's Device Identifier Composition
Engine (DICE) specification. The generated Compound Device Identifier
(CDI) certificates represent the hardware/software combination measured
by DICE, and can be used for remote attestation and sealing.
Add a driver that exposes reserved memory regions populated by firmware
with DICE CDIs and exposes them to userspace via a character device.
Userspace obtains the memory region's size from read() and calls mmap()
to create a mapping of the memory region in its address space. The
mapping is not allowed to be write+shared, giving userspace a guarantee
that the data were not overwritten by another process.
Userspace can also call write(), which triggers a wipe of the DICE data
by the driver. Because both the kernel and userspace mappings use
write-combine semantics, all clients observe the memory as zeroed after
the syscall has returned.
Cc: Andrew Scull <ascull@google.com>
Cc: Will Deacon <will@kernel.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: David Brazdil <dbrazdil@google.com>
Link: https://lore.kernel.org/r/20220126231237.529308-3-dbrazdil@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/Kconfig')
| -rw-r--r-- | drivers/misc/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 0f5a49fc7c9e..a2b26426efba 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -470,6 +470,18 @@ config HISI_HIKEY_USB switching between the dual-role USB-C port and the USB-A host ports using only one USB controller. +config OPEN_DICE + tristate "Open Profile for DICE driver" + depends on OF_RESERVED_MEM + help + This driver exposes a DICE reserved memory region to userspace via + a character device. The memory region contains Compound Device + Identifiers (CDIs) generated by firmware as an output of DICE + measured boot flow. Userspace can use CDIs for remote attestation + and sealing. + + If unsure, say N. + source "drivers/misc/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" |