[RFC v2 1/6] tee: optee: allow kernel pages to register as shm
From: Sumit Garg <hidden>
Date: 2019-07-30 12:24:35
Also in:
keyrings, linux-arm-kernel, linux-doc, linux-integrity, lkml
Subsystem:
op-tee driver, tee subsystem, the rest · Maintainers:
Jens Wiklander, Linus Torvalds
Kernel pages are marked as normal type memory only so allow kernel pages to be registered as shared memory with OP-TEE. Signed-off-by: Sumit Garg <redacted> Reviewed-by: Jarkko Sakkinen <redacted> Reviewed-by: Jens Wiklander <redacted> --- drivers/tee/optee/call.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
index aa94270..bce45b1 100644
--- a/drivers/tee/optee/call.c
+++ b/drivers/tee/optee/call.c@@ -553,6 +553,13 @@ static int 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(start)) + return 0; + down_read(&mm->mmap_sem); rc = __check_mem_type(find_vma(mm, start), start + num_pages * PAGE_SIZE);
--
2.7.4