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AMD-TEE driver bug fixes

Browse source 
AMD-TEE driver keeps track of shared memory buffers and their
 corresponding buffer id's in a global linked list. These buffers are
 used to share data between x86 and AMD Secure Processor. This pull
 request fixes issues related to maintaining mapped buffers in a shared
 linked list.
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Merge tag 'amdtee-fixes-for-5.10' of git://git.linaro.org:/people/jens.wiklander/linux-tee into arm/fixes

AMD-TEE driver bug fixes

AMD-TEE driver keeps track of shared memory buffers and their
corresponding buffer id's in a global linked list. These buffers are
used to share data between x86 and AMD Secure Processor. This pull
request fixes issues related to maintaining mapped buffers in a shared
linked list.

* tag 'amdtee-fixes-for-5.10' of git://git.linaro.org:/people/jens.wiklander/linux-tee:
  tee: amdtee: synchronize access to shm list
  tee: amdtee: fix memory leak due to reset of global shm list

Link: https://lore.kernel.org/r/20201109080809.GA3862873@jade
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2020-11-13 13:44:03 +01:00
commit 0461a1ae98
2 changed files with 23 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/tee/amdtee/amdtee_private.h
View file

@ -64,9 +64,13 @@ struct amdtee_session {
/**
* struct amdtee_context_data - AMD-TEE driver context data
* @sess_list: Keeps track of sessions opened in current TEE context
* @shm_list: Keeps track of buffers allocated and mapped in current TEE
* context
*/
struct amdtee_context_data {
struct list_head sess_list;
struct list_head shm_list;
struct mutex shm_mutex; /* synchronizes access to @shm_list */
};
struct amdtee_driver_data {
@ -89,10 +93,6 @@ struct amdtee_shm_data {
u32 buf_id;
};
struct amdtee_shm_context {
struct list_head shmdata_list;
};
#define LOWER_TWO_BYTE_MASK 0x0000FFFF
/**

26
drivers/tee/amdtee/core.c
View file

@ -20,7 +20,6 @@
static struct amdtee_driver_data *drv_data;
static DEFINE_MUTEX(session_list_mutex);
static struct amdtee_shm_context shmctx;
static void amdtee_get_version(struct tee_device *teedev,
struct tee_ioctl_version_data *vers)
@ -42,7 +41,8 @@ static int amdtee_open(struct tee_context *ctx)
return -ENOMEM;
INIT_LIST_HEAD(&ctxdata->sess_list);
INIT_LIST_HEAD(&shmctx.shmdata_list);
INIT_LIST_HEAD(&ctxdata->shm_list);
mutex_init(&ctxdata->shm_mutex);
ctx->data = ctxdata;
return 0;
@ -86,6 +86,7 @@ static void amdtee_release(struct tee_context *ctx)
list_del(&sess->list_node);
release_session(sess);
}
mutex_destroy(&ctxdata->shm_mutex);
kfree(ctxdata);
ctx->data = NULL;
@ -152,14 +153,17 @@ static struct amdtee_session *find_session(struct amdtee_context_data *ctxdata,
u32 get_buffer_id(struct tee_shm *shm)
{
u32 buf_id = 0;
struct amdtee_context_data *ctxdata = shm->ctx->data;
struct amdtee_shm_data *shmdata;
u32 buf_id = 0;
list_for_each_entry(shmdata, &shmctx.shmdata_list, shm_node)
mutex_lock(&ctxdata->shm_mutex);
list_for_each_entry(shmdata, &ctxdata->shm_list, shm_node)
if (shmdata->kaddr == shm->kaddr) {
buf_id = shmdata->buf_id;
break;
}
mutex_unlock(&ctxdata->shm_mutex);
return buf_id;
}
@ -333,8 +337,9 @@ int amdtee_close_session(struct tee_context *ctx, u32 session)
int amdtee_map_shmem(struct tee_shm *shm)
{
struct shmem_desc shmem;
struct amdtee_context_data *ctxdata;
struct amdtee_shm_data *shmnode;
struct shmem_desc shmem;
int rc, count;
u32 buf_id;
@ -362,7 +367,10 @@ int amdtee_map_shmem(struct tee_shm *shm)
shmnode->kaddr = shm->kaddr;
shmnode->buf_id = buf_id;
list_add(&shmnode->shm_node, &shmctx.shmdata_list);
ctxdata = shm->ctx->data;
mutex_lock(&ctxdata->shm_mutex);
list_add(&shmnode->shm_node, &ctxdata->shm_list);
mutex_unlock(&ctxdata->shm_mutex);
pr_debug("buf_id :[%x] kaddr[%p]\n", shmnode->buf_id, shmnode->kaddr);
@ -371,6 +379,7 @@ int amdtee_map_shmem(struct tee_shm *shm)
void amdtee_unmap_shmem(struct tee_shm *shm)
{
struct amdtee_context_data *ctxdata;
struct amdtee_shm_data *shmnode;
u32 buf_id;
@ -381,12 +390,15 @@ void amdtee_unmap_shmem(struct tee_shm *shm)
/* Unmap the shared memory from TEE */
handle_unmap_shmem(buf_id);
list_for_each_entry(shmnode, &shmctx.shmdata_list, shm_node)
ctxdata = shm->ctx->data;
mutex_lock(&ctxdata->shm_mutex);
list_for_each_entry(shmnode, &ctxdata->shm_list, shm_node)
if (buf_id == shmnode->buf_id) {
list_del(&shmnode->shm_node);
kfree(shmnode);
break;
}
mutex_unlock(&ctxdata->shm_mutex);
}
int amdtee_invoke_func(struct tee_context *ctx,