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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/tee/optee/call.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tee/optee/call.c')
-rw-r--r--drivers/tee/optee/call.c526
1 files changed, 526 insertions, 0 deletions
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
new file mode 100644
index 000000000..290b1bb0e
--- /dev/null
+++ b/drivers/tee/optee/call.c
@@ -0,0 +1,526 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2015-2021, Linaro Limited
+ */
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include <linux/types.h>
+#include "optee_private.h"
+
+#define MAX_ARG_PARAM_COUNT 6
+
+/*
+ * How much memory we allocate for each entry. This doesn't have to be a
+ * single page, but it makes sense to keep at least keep it as multiples of
+ * the page size.
+ */
+#define SHM_ENTRY_SIZE PAGE_SIZE
+
+/*
+ * We need to have a compile time constant to be able to determine the
+ * maximum needed size of the bit field.
+ */
+#define MIN_ARG_SIZE OPTEE_MSG_GET_ARG_SIZE(MAX_ARG_PARAM_COUNT)
+#define MAX_ARG_COUNT_PER_ENTRY (SHM_ENTRY_SIZE / MIN_ARG_SIZE)
+
+/*
+ * Shared memory for argument structs are cached here. The number of
+ * arguments structs that can fit is determined at runtime depending on the
+ * needed RPC parameter count reported by secure world
+ * (optee->rpc_param_count).
+ */
+struct optee_shm_arg_entry {
+ struct list_head list_node;
+ struct tee_shm *shm;
+ DECLARE_BITMAP(map, MAX_ARG_COUNT_PER_ENTRY);
+};
+
+void optee_cq_wait_init(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
+{
+ /*
+ * We're preparing to make a call to secure world. In case we can't
+ * allocate a thread in secure world we'll end up waiting in
+ * optee_cq_wait_for_completion().
+ *
+ * Normally if there's no contention in secure world the call will
+ * complete and we can cleanup directly with optee_cq_wait_final().
+ */
+ mutex_lock(&cq->mutex);
+
+ /*
+ * We add ourselves to the queue, but we don't wait. This
+ * guarantees that we don't lose a completion if secure world
+ * returns busy and another thread just exited and try to complete
+ * someone.
+ */
+ init_completion(&w->c);
+ list_add_tail(&w->list_node, &cq->waiters);
+
+ mutex_unlock(&cq->mutex);
+}
+
+void optee_cq_wait_for_completion(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
+{
+ wait_for_completion(&w->c);
+
+ mutex_lock(&cq->mutex);
+
+ /* Move to end of list to get out of the way for other waiters */
+ list_del(&w->list_node);
+ reinit_completion(&w->c);
+ list_add_tail(&w->list_node, &cq->waiters);
+
+ mutex_unlock(&cq->mutex);
+}
+
+static void optee_cq_complete_one(struct optee_call_queue *cq)
+{
+ struct optee_call_waiter *w;
+
+ list_for_each_entry(w, &cq->waiters, list_node) {
+ if (!completion_done(&w->c)) {
+ complete(&w->c);
+ break;
+ }
+ }
+}
+
+void optee_cq_wait_final(struct optee_call_queue *cq,
+ struct optee_call_waiter *w)
+{
+ /*
+ * We're done with the call to secure world. The thread in secure
+ * world that was used for this call is now available for some
+ * other task to use.
+ */
+ mutex_lock(&cq->mutex);
+
+ /* Get out of the list */
+ list_del(&w->list_node);
+
+ /* Wake up one eventual waiting task */
+ optee_cq_complete_one(cq);
+
+ /*
+ * If we're completed we've got a completion from another task that
+ * was just done with its call to secure world. Since yet another
+ * thread now is available in secure world wake up another eventual
+ * waiting task.
+ */
+ if (completion_done(&w->c))
+ optee_cq_complete_one(cq);
+
+ mutex_unlock(&cq->mutex);
+}
+
+/* Requires the filpstate mutex to be held */
+static struct optee_session *find_session(struct optee_context_data *ctxdata,
+ u32 session_id)
+{
+ struct optee_session *sess;
+
+ list_for_each_entry(sess, &ctxdata->sess_list, list_node)
+ if (sess->session_id == session_id)
+ return sess;
+
+ return NULL;
+}
+
+void optee_shm_arg_cache_init(struct optee *optee, u32 flags)
+{
+ INIT_LIST_HEAD(&optee->shm_arg_cache.shm_args);
+ mutex_init(&optee->shm_arg_cache.mutex);
+ optee->shm_arg_cache.flags = flags;
+}
+
+void optee_shm_arg_cache_uninit(struct optee *optee)
+{
+ struct list_head *head = &optee->shm_arg_cache.shm_args;
+ struct optee_shm_arg_entry *entry;
+
+ mutex_destroy(&optee->shm_arg_cache.mutex);
+ while (!list_empty(head)) {
+ entry = list_first_entry(head, struct optee_shm_arg_entry,
+ list_node);
+ list_del(&entry->list_node);
+ if (find_first_bit(entry->map, MAX_ARG_COUNT_PER_ENTRY) !=
+ MAX_ARG_COUNT_PER_ENTRY) {
+ pr_err("Freeing non-free entry\n");
+ }
+ tee_shm_free(entry->shm);
+ kfree(entry);
+ }
+}
+
+size_t optee_msg_arg_size(size_t rpc_param_count)
+{
+ size_t sz = OPTEE_MSG_GET_ARG_SIZE(MAX_ARG_PARAM_COUNT);
+
+ if (rpc_param_count)
+ sz += OPTEE_MSG_GET_ARG_SIZE(rpc_param_count);
+
+ return sz;
+}
+
+/**
+ * optee_get_msg_arg() - Provide shared memory for argument struct
+ * @ctx: Caller TEE context
+ * @num_params: Number of parameter to store
+ * @entry_ret: Entry pointer, needed when freeing the buffer
+ * @shm_ret: Shared memory buffer
+ * @offs_ret: Offset of argument strut in shared memory buffer
+ *
+ * @returns a pointer to the argument struct in memory, else an ERR_PTR
+ */
+struct optee_msg_arg *optee_get_msg_arg(struct tee_context *ctx,
+ size_t num_params,
+ struct optee_shm_arg_entry **entry_ret,
+ struct tee_shm **shm_ret,
+ u_int *offs_ret)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ size_t sz = optee_msg_arg_size(optee->rpc_param_count);
+ struct optee_shm_arg_entry *entry;
+ struct optee_msg_arg *ma;
+ size_t args_per_entry;
+ u_long bit;
+ u_int offs;
+ void *res;
+
+ if (num_params > MAX_ARG_PARAM_COUNT)
+ return ERR_PTR(-EINVAL);
+
+ if (optee->shm_arg_cache.flags & OPTEE_SHM_ARG_SHARED)
+ args_per_entry = SHM_ENTRY_SIZE / sz;
+ else
+ args_per_entry = 1;
+
+ mutex_lock(&optee->shm_arg_cache.mutex);
+ list_for_each_entry(entry, &optee->shm_arg_cache.shm_args, list_node) {
+ bit = find_first_zero_bit(entry->map, MAX_ARG_COUNT_PER_ENTRY);
+ if (bit < args_per_entry)
+ goto have_entry;
+ }
+
+ /*
+ * No entry was found, let's allocate a new.
+ */
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (!entry) {
+ res = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ if (optee->shm_arg_cache.flags & OPTEE_SHM_ARG_ALLOC_PRIV)
+ res = tee_shm_alloc_priv_buf(ctx, SHM_ENTRY_SIZE);
+ else
+ res = tee_shm_alloc_kernel_buf(ctx, SHM_ENTRY_SIZE);
+
+ if (IS_ERR(res)) {
+ kfree(entry);
+ goto out;
+ }
+ entry->shm = res;
+ list_add(&entry->list_node, &optee->shm_arg_cache.shm_args);
+ bit = 0;
+
+have_entry:
+ offs = bit * sz;
+ res = tee_shm_get_va(entry->shm, offs);
+ if (IS_ERR(res))
+ goto out;
+ ma = res;
+ set_bit(bit, entry->map);
+ memset(ma, 0, sz);
+ ma->num_params = num_params;
+ *entry_ret = entry;
+ *shm_ret = entry->shm;
+ *offs_ret = offs;
+out:
+ mutex_unlock(&optee->shm_arg_cache.mutex);
+ return res;
+}
+
+/**
+ * optee_free_msg_arg() - Free previsouly obtained shared memory
+ * @ctx: Caller TEE context
+ * @entry: Pointer returned when the shared memory was obtained
+ * @offs: Offset of shared memory buffer to free
+ *
+ * This function frees the shared memory obtained with optee_get_msg_arg().
+ */
+void optee_free_msg_arg(struct tee_context *ctx,
+ struct optee_shm_arg_entry *entry, u_int offs)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ size_t sz = optee_msg_arg_size(optee->rpc_param_count);
+ u_long bit;
+
+ if (offs > SHM_ENTRY_SIZE || offs % sz) {
+ pr_err("Invalid offs %u\n", offs);
+ return;
+ }
+ bit = offs / sz;
+
+ mutex_lock(&optee->shm_arg_cache.mutex);
+
+ if (!test_bit(bit, entry->map))
+ pr_err("Bit pos %lu is already free\n", bit);
+ clear_bit(bit, entry->map);
+
+ mutex_unlock(&optee->shm_arg_cache.mutex);
+}
+
+int optee_open_session(struct tee_context *ctx,
+ struct tee_ioctl_open_session_arg *arg,
+ struct tee_param *param)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_context_data *ctxdata = ctx->data;
+ struct optee_shm_arg_entry *entry;
+ struct tee_shm *shm;
+ struct optee_msg_arg *msg_arg;
+ struct optee_session *sess = NULL;
+ uuid_t client_uuid;
+ u_int offs;
+ int rc;
+
+ /* +2 for the meta parameters added below */
+ msg_arg = optee_get_msg_arg(ctx, arg->num_params + 2,
+ &entry, &shm, &offs);
+ if (IS_ERR(msg_arg))
+ return PTR_ERR(msg_arg);
+
+ msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION;
+ msg_arg->cancel_id = arg->cancel_id;
+
+ /*
+ * Initialize and add the meta parameters needed when opening a
+ * session.
+ */
+ msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
+ OPTEE_MSG_ATTR_META;
+ msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT |
+ OPTEE_MSG_ATTR_META;
+ memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid));
+ msg_arg->params[1].u.value.c = arg->clnt_login;
+
+ rc = tee_session_calc_client_uuid(&client_uuid, arg->clnt_login,
+ arg->clnt_uuid);
+ if (rc)
+ goto out;
+ export_uuid(msg_arg->params[1].u.octets, &client_uuid);
+
+ rc = optee->ops->to_msg_param(optee, msg_arg->params + 2,
+ arg->num_params, param);
+ if (rc)
+ goto out;
+
+ sess = kzalloc(sizeof(*sess), GFP_KERNEL);
+ if (!sess) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ if (optee->ops->do_call_with_arg(ctx, shm, offs)) {
+ msg_arg->ret = TEEC_ERROR_COMMUNICATION;
+ msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
+ }
+
+ if (msg_arg->ret == TEEC_SUCCESS) {
+ /* A new session has been created, add it to the list. */
+ sess->session_id = msg_arg->session;
+ mutex_lock(&ctxdata->mutex);
+ list_add(&sess->list_node, &ctxdata->sess_list);
+ mutex_unlock(&ctxdata->mutex);
+ } else {
+ kfree(sess);
+ }
+
+ if (optee->ops->from_msg_param(optee, param, arg->num_params,
+ msg_arg->params + 2)) {
+ arg->ret = TEEC_ERROR_COMMUNICATION;
+ arg->ret_origin = TEEC_ORIGIN_COMMS;
+ /* Close session again to avoid leakage */
+ optee_close_session(ctx, msg_arg->session);
+ } else {
+ arg->session = msg_arg->session;
+ arg->ret = msg_arg->ret;
+ arg->ret_origin = msg_arg->ret_origin;
+ }
+out:
+ optee_free_msg_arg(ctx, entry, offs);
+
+ return rc;
+}
+
+int optee_close_session_helper(struct tee_context *ctx, u32 session)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_shm_arg_entry *entry;
+ struct optee_msg_arg *msg_arg;
+ struct tee_shm *shm;
+ u_int offs;
+
+ msg_arg = optee_get_msg_arg(ctx, 0, &entry, &shm, &offs);
+ if (IS_ERR(msg_arg))
+ return PTR_ERR(msg_arg);
+
+ msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
+ msg_arg->session = session;
+ optee->ops->do_call_with_arg(ctx, shm, offs);
+
+ optee_free_msg_arg(ctx, entry, offs);
+
+ return 0;
+}
+
+int optee_close_session(struct tee_context *ctx, u32 session)
+{
+ struct optee_context_data *ctxdata = ctx->data;
+ struct optee_session *sess;
+
+ /* Check that the session is valid and remove it from the list */
+ mutex_lock(&ctxdata->mutex);
+ sess = find_session(ctxdata, session);
+ if (sess)
+ list_del(&sess->list_node);
+ mutex_unlock(&ctxdata->mutex);
+ if (!sess)
+ return -EINVAL;
+ kfree(sess);
+
+ return optee_close_session_helper(ctx, session);
+}
+
+int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
+ struct tee_param *param)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_context_data *ctxdata = ctx->data;
+ struct optee_shm_arg_entry *entry;
+ struct optee_msg_arg *msg_arg;
+ struct optee_session *sess;
+ struct tee_shm *shm;
+ u_int offs;
+ int rc;
+
+ /* Check that the session is valid */
+ mutex_lock(&ctxdata->mutex);
+ sess = find_session(ctxdata, arg->session);
+ mutex_unlock(&ctxdata->mutex);
+ if (!sess)
+ return -EINVAL;
+
+ msg_arg = optee_get_msg_arg(ctx, arg->num_params,
+ &entry, &shm, &offs);
+ if (IS_ERR(msg_arg))
+ return PTR_ERR(msg_arg);
+ msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND;
+ msg_arg->func = arg->func;
+ msg_arg->session = arg->session;
+ msg_arg->cancel_id = arg->cancel_id;
+
+ rc = optee->ops->to_msg_param(optee, msg_arg->params, arg->num_params,
+ param);
+ if (rc)
+ goto out;
+
+ if (optee->ops->do_call_with_arg(ctx, shm, offs)) {
+ msg_arg->ret = TEEC_ERROR_COMMUNICATION;
+ msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
+ }
+
+ if (optee->ops->from_msg_param(optee, param, arg->num_params,
+ msg_arg->params)) {
+ msg_arg->ret = TEEC_ERROR_COMMUNICATION;
+ msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
+ }
+
+ arg->ret = msg_arg->ret;
+ arg->ret_origin = msg_arg->ret_origin;
+out:
+ optee_free_msg_arg(ctx, entry, offs);
+ return rc;
+}
+
+int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_context_data *ctxdata = ctx->data;
+ struct optee_shm_arg_entry *entry;
+ struct optee_msg_arg *msg_arg;
+ struct optee_session *sess;
+ struct tee_shm *shm;
+ u_int offs;
+
+ /* Check that the session is valid */
+ mutex_lock(&ctxdata->mutex);
+ sess = find_session(ctxdata, session);
+ mutex_unlock(&ctxdata->mutex);
+ if (!sess)
+ return -EINVAL;
+
+ msg_arg = optee_get_msg_arg(ctx, 0, &entry, &shm, &offs);
+ if (IS_ERR(msg_arg))
+ return PTR_ERR(msg_arg);
+
+ msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
+ msg_arg->session = session;
+ msg_arg->cancel_id = cancel_id;
+ optee->ops->do_call_with_arg(ctx, shm, offs);
+
+ optee_free_msg_arg(ctx, entry, offs);
+ return 0;
+}
+
+static bool is_normal_memory(pgprot_t p)
+{
+#if defined(CONFIG_ARM)
+ return (((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEALLOC) ||
+ ((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEBACK));
+#elif defined(CONFIG_ARM64)
+ return (pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL);
+#else
+#error "Unuspported architecture"
+#endif
+}
+
+static int __check_mem_type(struct mm_struct *mm, unsigned long start,
+ unsigned long end)
+{
+ struct vm_area_struct *vma;
+ VMA_ITERATOR(vmi, mm, start);
+
+ for_each_vma_range(vmi, vma, end) {
+ if (!is_normal_memory(vma->vm_page_prot))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int optee_check_mem_type(unsigned long start, size_t num_pages)
+{
+ struct mm_struct *mm = current->mm;
+ int rc;
+
+ /*
+ * Allow kernel address to register with OP-TEE as kernel
+ * pages are configured as normal memory only.
+ */
+ if (virt_addr_valid((void *)start) || is_vmalloc_addr((void *)start))
+ return 0;
+
+ mmap_read_lock(mm);
+ rc = __check_mem_type(mm, start, start + num_pages * PAGE_SIZE);
+ mmap_read_unlock(mm);
+
+ return rc;
+}