linux-kernel - [PATCH 10/11] sep: ensure that caller id buffer is little endian

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Message-Id: <1291915958-18658-1-git-send-email-mark.a.allyn@intel.com>
Date:	Thu,  9 Dec 2010 09:32:38 -0800
From:	Mark Allyn <mark.a.allyn@...el.com>
To:	linux-kernel@...r.kernel.org, greg@...ah.com,
	mark.a.allyn@...el.com, alan@...ux.intel.com,
	dmitry.kasatkin@...ia.com
Subject: [PATCH 10/11] sep: ensure that caller id buffer is little endian

Signed-off-by: Mark Allyn <mark.a.allyn@...el.com>
---
 drivers/staging/sep/sep_driver.c        |    8 ++++++++
 drivers/staging/sep/sep_driver_config.h |    3 +++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/sep/sep_driver.c b/drivers/staging/sep/sep_driver.c
index 903d610..bb42b04 100644
--- a/drivers/staging/sep/sep_driver.c
+++ b/drivers/staging/sep/sep_driver.c
@@ -897,6 +897,7 @@ end_function:
 static int sep_set_current_caller_id(struct sep_device *sep)
 {
 	int i;
+	u32 *hash_buf_ptr;
 
 	dev_dbg(&sep->pdev->dev, "sep_set_current_caller_id start\n");
 	dev_dbg(&sep->pdev->dev, "current process is %d\n", current->pid);
@@ -915,6 +916,13 @@ static int sep_set_current_caller_id(struct sep_device *sep)
 			break;
 		}
 	}
+	/* Ensure data is in little endian */
+	hash_buf_ptr = (u32 *)sep->shared_addr +
+		SEP_CALLER_ID_OFFSET_BYTES;
+
+	for (i = 0; i < SEP_CALLER_ID_HASH_SIZE_IN_WORDS; i++)
+		hash_buf_ptr[i] = cpu_to_le32(hash_buf_ptr[i]);
+
 	dev_dbg(&sep->pdev->dev, "sep_set_current_caller_id end\n");
 	return 0;
 }
diff --git a/drivers/staging/sep/sep_driver_config.h b/drivers/staging/sep/sep_driver_config.h
index 92338c0..b18625d 100644
--- a/drivers/staging/sep/sep_driver_config.h
+++ b/drivers/staging/sep/sep_driver_config.h
@@ -201,6 +201,9 @@ held by the proccess (struct file) */
 /* size of the caller id hash (sha2) */
 #define SEP_CALLER_ID_HASH_SIZE_IN_BYTES                      32
 
+/* size of the caller id hash (sha2) in 32 bit words */
+#define SEP_CALLER_ID_HASH_SIZE_IN_WORDS                8
+
 /* maximum number of entries in the caller id table */
 #define SEP_CALLER_ID_TABLE_NUM_ENTRIES                       20
 
-- 
1.6.3.3

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