6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mario Limonciello <mario.limonciello@xxxxxxx>
[ Upstream commit 2ad01eb5fad24627ab4e196dc54a220753b2238b ]
When parameters are sent the PSP returns back it's own signature
for the application to verify the authenticity of the result.
Display this signature to the caller instead of the one the caller
sent.
Fixes: f40d42f116cf ("crypto: ccp - Add a sample python script for Dynamic Boost Control")
Fixes: febe3ed3222f ("crypto: ccp - Add a sample library for ioctl use")
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/crypto/ccp/dbc.c | 1 +
tools/crypto/ccp/dbc.py | 5 +++--
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/crypto/ccp/dbc.c b/tools/crypto/ccp/dbc.c
index 7774e981849fa..a807df0f05974 100644
--- a/tools/crypto/ccp/dbc.c
+++ b/tools/crypto/ccp/dbc.c
@@ -68,5 +68,6 @@ int process_param(int fd, int msg_index, __u8 *signature, int *data)
return errno;
*data = tmp.param;
+ memcpy(signature, tmp.signature, sizeof(tmp.signature));
return 0;
}
diff --git a/tools/crypto/ccp/dbc.py b/tools/crypto/ccp/dbc.py
index 3956efe7537ac..2b91415b19407 100644
--- a/tools/crypto/ccp/dbc.py
+++ b/tools/crypto/ccp/dbc.py
@@ -57,7 +57,8 @@ def process_param(device, message, signature, data=None):
if type(message) != tuple:
raise ValueError("Expected message tuple")
arg = ctypes.c_int(data if data else 0)
- ret = lib.process_param(device.fileno(), message[0], signature, ctypes.pointer(arg))
+ sig = ctypes.create_string_buffer(signature, len(signature))
+ ret = lib.process_param(device.fileno(), message[0], ctypes.pointer(sig), ctypes.pointer(arg))
if ret:
handle_error(ret)
- return arg, signature
+ return arg.value, sig.value
--
2.42.0
