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Subject[PATCH 20/20] staging: gasket: common ioctls add __user annotations
Date
From: Todd Poynor <toddpoynor@google.com>

Add __user annotation to gasket common ioctl pointer arguments for
sparse checking.

Reported-by: Dmitry Torokhov <dtor@chromium.org>
Signed-off-by: Zhongze Hu <frankhu@chromium.org>
Signed-off-by: Todd Poynor <toddpoynor@google.com>
---
drivers/staging/gasket/gasket_ioctl.c | 102 ++++++++++++++------------
1 file changed, 55 insertions(+), 47 deletions(-)

diff --git a/drivers/staging/gasket/gasket_ioctl.c b/drivers/staging/gasket/gasket_ioctl.c
index 998d0e215523c..2e2c9b997093b 100644
--- a/drivers/staging/gasket/gasket_ioctl.c
+++ b/drivers/staging/gasket/gasket_ioctl.c
@@ -24,17 +24,24 @@
#endif

static bool gasket_ioctl_check_permissions(struct file *filp, uint cmd);
-static int gasket_set_event_fd(struct gasket_dev *dev, ulong arg);
+static int gasket_set_event_fd(struct gasket_dev *dev,
+ struct gasket_interrupt_eventfd __user *argp);
static int gasket_read_page_table_size(
- struct gasket_dev *gasket_dev, ulong arg);
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp);
static int gasket_read_simple_page_table_size(
- struct gasket_dev *gasket_dev, ulong arg);
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp);
static int gasket_partition_page_table(
- struct gasket_dev *gasket_dev, ulong arg);
-static int gasket_map_buffers(struct gasket_dev *gasket_dev, ulong arg);
-static int gasket_unmap_buffers(struct gasket_dev *gasket_dev, ulong arg);
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp);
+static int gasket_map_buffers(struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp);
+static int gasket_unmap_buffers(struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp);
static int gasket_config_coherent_allocator(
- struct gasket_dev *gasket_dev, ulong arg);
+ struct gasket_dev *gasket_dev,
+ struct gasket_coherent_alloc_config_ioctl __user *argp);

/*
* standard ioctl dispatch function.
@@ -80,7 +87,7 @@ long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp)
retval = gasket_reset(gasket_dev, arg);
break;
case GASKET_IOCTL_SET_EVENTFD:
- retval = gasket_set_event_fd(gasket_dev, arg);
+ retval = gasket_set_event_fd(gasket_dev, argp);
break;
case GASKET_IOCTL_CLEAR_EVENTFD:
trace_gasket_ioctl_integer_data(arg);
@@ -89,31 +96,30 @@ long gasket_handle_ioctl(struct file *filp, uint cmd, void __user *argp)
break;
case GASKET_IOCTL_PARTITION_PAGE_TABLE:
trace_gasket_ioctl_integer_data(arg);
- retval = gasket_partition_page_table(gasket_dev, arg);
+ retval = gasket_partition_page_table(gasket_dev, argp);
break;
case GASKET_IOCTL_NUMBER_PAGE_TABLES:
trace_gasket_ioctl_integer_data(gasket_dev->num_page_tables);
- if (copy_to_user((void __user *)arg,
- &gasket_dev->num_page_tables,
+ if (copy_to_user(argp, &gasket_dev->num_page_tables,
sizeof(uint64_t)))
retval = -EFAULT;
else
retval = 0;
break;
case GASKET_IOCTL_PAGE_TABLE_SIZE:
- retval = gasket_read_page_table_size(gasket_dev, arg);
+ retval = gasket_read_page_table_size(gasket_dev, argp);
break;
case GASKET_IOCTL_SIMPLE_PAGE_TABLE_SIZE:
- retval = gasket_read_simple_page_table_size(gasket_dev, arg);
+ retval = gasket_read_simple_page_table_size(gasket_dev, argp);
break;
case GASKET_IOCTL_MAP_BUFFER:
- retval = gasket_map_buffers(gasket_dev, arg);
+ retval = gasket_map_buffers(gasket_dev, argp);
break;
case GASKET_IOCTL_CONFIG_COHERENT_ALLOCATOR:
- retval = gasket_config_coherent_allocator(gasket_dev, arg);
+ retval = gasket_config_coherent_allocator(gasket_dev, argp);
break;
case GASKET_IOCTL_UNMAP_BUFFER:
- retval = gasket_unmap_buffers(gasket_dev, arg);
+ retval = gasket_unmap_buffers(gasket_dev, argp);
break;
case GASKET_IOCTL_CLEAR_INTERRUPT_COUNTS:
/* Clear interrupt counts doesn't take an arg, so use 0. */
@@ -218,16 +224,15 @@ static bool gasket_ioctl_check_permissions(struct file *filp, uint cmd)
/*
* Associate an eventfd with an interrupt.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to gasket_interrupt_eventfd struct in userspace.
+ * @argp: Pointer to gasket_interrupt_eventfd struct in userspace.
*/
-static int gasket_set_event_fd(struct gasket_dev *gasket_dev, ulong arg)
+static int gasket_set_event_fd(struct gasket_dev *gasket_dev,
+ struct gasket_interrupt_eventfd __user *argp)
{
struct gasket_interrupt_eventfd die;

- if (copy_from_user(&die, (void __user *)arg,
- sizeof(struct gasket_interrupt_eventfd))) {
+ if (copy_from_user(&die, argp, sizeof(struct gasket_interrupt_eventfd)))
return -EFAULT;
- }

trace_gasket_ioctl_eventfd_data(die.interrupt, die.event_fd);

@@ -238,15 +243,16 @@ static int gasket_set_event_fd(struct gasket_dev *gasket_dev, ulong arg)
/*
* Reads the size of the page table.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to gasket_page_table_ioctl struct in userspace.
+ * @argp: Pointer to gasket_page_table_ioctl struct in userspace.
*/
-static int gasket_read_page_table_size(struct gasket_dev *gasket_dev, ulong arg)
+static int gasket_read_page_table_size(
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp)
{
int ret = 0;
struct gasket_page_table_ioctl ibuf;

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

if (ibuf.page_table_index >= gasket_dev->num_page_tables)
@@ -259,7 +265,7 @@ static int gasket_read_page_table_size(struct gasket_dev *gasket_dev, ulong arg)
ibuf.page_table_index, ibuf.size, ibuf.host_address,
ibuf.device_address);

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

return ret;
@@ -268,16 +274,16 @@ static int gasket_read_page_table_size(struct gasket_dev *gasket_dev, ulong arg)
/*
* Reads the size of the simple page table.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to gasket_page_table_ioctl struct in userspace.
+ * @argp: Pointer to gasket_page_table_ioctl struct in userspace.
*/
static int gasket_read_simple_page_table_size(
- struct gasket_dev *gasket_dev, ulong arg)
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp)
{
int ret = 0;
struct gasket_page_table_ioctl ibuf;

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

if (ibuf.page_table_index >= gasket_dev->num_page_tables)
@@ -290,7 +296,7 @@ static int gasket_read_simple_page_table_size(
ibuf.page_table_index, ibuf.size, ibuf.host_address,
ibuf.device_address);

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

return ret;
@@ -299,16 +305,17 @@ static int gasket_read_simple_page_table_size(
/*
* Sets the boundary between the simple and extended page tables.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to gasket_page_table_ioctl struct in userspace.
+ * @argp: Pointer to gasket_page_table_ioctl struct in userspace.
*/
-static int gasket_partition_page_table(struct gasket_dev *gasket_dev, ulong arg)
+static int gasket_partition_page_table(
+ struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp)
{
int ret;
struct gasket_page_table_ioctl ibuf;
uint max_page_table_size;

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

trace_gasket_ioctl_page_table_data(
@@ -340,14 +347,14 @@ static int gasket_partition_page_table(struct gasket_dev *gasket_dev, ulong arg)
/*
* Maps a userspace buffer to a device virtual address.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to a gasket_page_table_ioctl struct in userspace.
+ * @argp: Pointer to a gasket_page_table_ioctl struct in userspace.
*/
-static int gasket_map_buffers(struct gasket_dev *gasket_dev, ulong arg)
+static int gasket_map_buffers(struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp)
{
struct gasket_page_table_ioctl ibuf;

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

trace_gasket_ioctl_page_table_data(
@@ -370,14 +377,14 @@ static int gasket_map_buffers(struct gasket_dev *gasket_dev, ulong arg)
/*
* Unmaps a userspace buffer from a device virtual address.
* @gasket_dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to a gasket_page_table_ioctl struct in userspace.
+ * @argp: Pointer to a gasket_page_table_ioctl struct in userspace.
*/
-static int gasket_unmap_buffers(struct gasket_dev *gasket_dev, ulong arg)
+static int gasket_unmap_buffers(struct gasket_dev *gasket_dev,
+ struct gasket_page_table_ioctl __user *argp)
{
struct gasket_page_table_ioctl ibuf;

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

trace_gasket_ioctl_page_table_data(
@@ -402,15 +409,16 @@ static int gasket_unmap_buffers(struct gasket_dev *gasket_dev, ulong arg)
* Tell the driver to reserve structures for coherent allocation, and allocate
* or free the corresponding memory.
* @dev: Pointer to the current gasket_dev we're using.
- * @arg: Pointer to a gasket_coherent_alloc_config_ioctl struct in userspace.
+ * @argp: Pointer to a gasket_coherent_alloc_config_ioctl struct in userspace.
*/
static int gasket_config_coherent_allocator(
- struct gasket_dev *gasket_dev, ulong arg)
+ struct gasket_dev *gasket_dev,
+ struct gasket_coherent_alloc_config_ioctl __user *argp)
{
int ret;
struct gasket_coherent_alloc_config_ioctl ibuf;

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

@@ -432,7 +440,7 @@ static int gasket_config_coherent_allocator(
gasket_dev, ibuf.size, &ibuf.dma_address,
ibuf.page_table_index);
}
- if (copy_to_user((void __user *)arg, &ibuf, sizeof(ibuf)))
+ if (copy_to_user(argp, &ibuf, sizeof(ibuf)))
return -EFAULT;

return ret;
--
2.18.0.233.g985f88cf7e-goog
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