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authorCedric Neveux <cedric.neveux@nxp.com>2019-03-04 08:54:23 +0100
committerJens Wiklander <jens.wiklander@linaro.org>2020-08-21 08:55:13 +0200
commitba171d3f0850003216fd1a85190d17b1feddb961 (patch)
tree32c534e8e4d18d1e2a9350b7333f53325137c209 /include
parent9123e3a74ec7b934a4a099e98af6a61c2f80bbf5 (diff)
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driver: tee: Handle NULL pointer indication from client
TEE Client introduce a new capability "TEE_GEN_CAP_MEMREF_NULL" to handle the support of the shared memory buffer with a NULL pointer. This capability depends on TEE Capabilities and driver support. Driver and TEE exchange capabilities at driver initialization. Signed-off-by: Michael Whitfield <michael.whitfield@nxp.com> Signed-off-by: Cedric Neveux <cedric.neveux@nxp.com> Reviewed-by: Joakim Bech <joakim.bech@linaro.org> Tested-by: Joakim Bech <joakim.bech@linaro.org> (QEMU) Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/tee_drv.h3
-rw-r--r--include/uapi/linux/tee.h13
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
index d074302989dd..cdd049a724b1 100644
--- a/include/linux/tee_drv.h
+++ b/include/linux/tee_drv.h
@@ -47,6 +47,8 @@ struct tee_shm_pool;
* and just return with an error code. It is needed for requests
* that arises from TEE based kernel drivers that should be
* non-blocking in nature.
+ * @cap_memref_null: flag indicating if the TEE Client support shared
+ * memory buffer with a NULL pointer.
*/
struct tee_context {
struct tee_device *teedev;
@@ -54,6 +56,7 @@ struct tee_context {
struct kref refcount;
bool releasing;
bool supp_nowait;
+ bool cap_memref_null;
};
struct tee_param_memref {
diff --git a/include/uapi/linux/tee.h b/include/uapi/linux/tee.h
index b619f37ee03e..d67cadf221fc 100644
--- a/include/uapi/linux/tee.h
+++ b/include/uapi/linux/tee.h
@@ -51,6 +51,9 @@
#define TEE_GEN_CAP_GP (1 << 0)/* GlobalPlatform compliant TEE */
#define TEE_GEN_CAP_PRIVILEGED (1 << 1)/* Privileged device (for supplicant) */
#define TEE_GEN_CAP_REG_MEM (1 << 2)/* Supports registering shared memory */
+#define TEE_GEN_CAP_MEMREF_NULL (1 << 3)/* NULL MemRef support */
+
+#define TEE_MEMREF_NULL (__u64)(-1) /* NULL MemRef Buffer */
/*
* TEE Implementation ID
@@ -200,6 +203,16 @@ struct tee_ioctl_buf_data {
* a part of a shared memory by specifying an offset (@a) and size (@b) of
* the object. To supply the entire shared memory object set the offset
* (@a) to 0 and size (@b) to the previously returned size of the object.
+ *
+ * A client may need to present a NULL pointer in the argument
+ * passed to a trusted application in the TEE.
+ * This is also a requirement in GlobalPlatform Client API v1.0c
+ * (section 3.2.5 memory references), which can be found at
+ * http://www.globalplatform.org/specificationsdevice.asp
+ *
+ * If a NULL pointer is passed to a TA in the TEE, the (@c)
+ * IOCTL parameters value must be set to TEE_MEMREF_NULL indicating a NULL
+ * memory reference.
*/
struct tee_ioctl_param {
__u64 attr;