[PATCH 18/20] staging: gasket: apex ioctl add __user annotations

From: Todd Poynor
Date: Sat Jul 21 2018 - 08:58:18 EST


From: Todd Poynor <toddpoynor@xxxxxxxxxx>

Add __user annotation to ioctl pointer argument, for sparse checking.

Reported-by: Dmitry Torokhov <dtor@xxxxxxxxxxxx>
Signed-off-by: Zhongze Hu <frankhu@xxxxxxxxxxxx>
Signed-off-by: Todd Poynor <toddpoynor@xxxxxxxxxx>
---
drivers/staging/gasket/apex_driver.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/gasket/apex_driver.c b/drivers/staging/gasket/apex_driver.c
index 4c00f3609f081..3e76c4db5db2e 100644
--- a/drivers/staging/gasket/apex_driver.c
+++ b/drivers/staging/gasket/apex_driver.c
@@ -5,6 +5,7 @@
* Copyright (C) 2018 Google, Inc.
*/

+#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/init.h>
@@ -142,9 +143,10 @@ static int apex_get_status(struct gasket_dev *gasket_dev);

static bool apex_ioctl_check_permissions(struct file *file, uint cmd);

-static long apex_ioctl(struct file *file, uint cmd, ulong arg);
+static long apex_ioctl(struct file *file, uint cmd, void __user *argp);

-static long apex_clock_gating(struct gasket_dev *gasket_dev, ulong arg);
+static long apex_clock_gating(struct gasket_dev *gasket_dev,
+ struct apex_gate_clock_ioctl __user *argp);

static int apex_enter_reset(struct gasket_dev *gasket_dev, uint type);

@@ -635,7 +637,7 @@ static bool apex_ioctl_check_permissions(struct file *filp, uint cmd)
/*
* Apex-specific ioctl handler.
*/
-static long apex_ioctl(struct file *filp, uint cmd, ulong arg)
+static long apex_ioctl(struct file *filp, uint cmd, void __user *argp)
{
struct gasket_dev *gasket_dev = filp->private_data;

@@ -644,7 +646,7 @@ static long apex_ioctl(struct file *filp, uint cmd, ulong arg)

switch (cmd) {
case APEX_IOCTL_GATE_CLOCK:
- return apex_clock_gating(gasket_dev, arg);
+ return apex_clock_gating(gasket_dev, argp);
default:
return -ENOTTY; /* unknown command */
}
@@ -653,16 +655,17 @@ static long apex_ioctl(struct file *filp, uint cmd, ulong arg)
/*
* Gates or un-gates Apex clock.
* @gasket_dev: Gasket device pointer.
- * @arg: User ioctl arg, in this case to a apex_gate_clock_ioctl struct.
+ * @argp: User ioctl arg, pointer to a apex_gate_clock_ioctl struct.
*/
-static long apex_clock_gating(struct gasket_dev *gasket_dev, ulong arg)
+static long apex_clock_gating(struct gasket_dev *gasket_dev,
+ struct apex_gate_clock_ioctl __user *argp)
{
struct apex_gate_clock_ioctl ibuf;

if (bypass_top_level || !allow_sw_clock_gating)
return 0;

- if (copy_from_user(&ibuf, (void __user *)arg, sizeof(ibuf)))
+ if (copy_from_user(&ibuf, argp, sizeof(ibuf)))
return -EFAULT;

gasket_log_error(gasket_dev, "%s %llu", __func__, ibuf.enable);
--
2.18.0.233.g985f88cf7e-goog