linux-kernel - [RFC v2 1/6] tee: optee: allow kernel pages to register as shm

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Date:   Tue, 30 Jul 2019 17:53:35 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     keyrings@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org
Cc:     jens.wiklander@...aro.org, corbet@....net, dhowells@...hat.com,
        jejb@...ux.ibm.com, jarkko.sakkinen@...ux.intel.com,
        zohar@...ux.ibm.com, jmorris@...ei.org, serge@...lyn.com,
        casey@...aufler-ca.com, ard.biesheuvel@...aro.org,
        daniel.thompson@...aro.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        tee-dev@...ts.linaro.org, Sumit Garg <sumit.garg@...aro.org>
Subject: [RFC v2 1/6] tee: optee: allow kernel pages to register as shm

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 <sumit.garg@...aro.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Reviewed-by: Jens Wiklander <jens.wiklander@...aro.org>
---
 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