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Subject[patch] Stricter checks in [gs]etkeycode, recompute keybit there also
Hi!

You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.
'bk pull bk://linux-input.bkbits.net/linux-input' should work as well.

===================================================================

ChangeSet@1.542, 2002-08-26 11:13:55+02:00, vojtech@suse.cz
Shorten the keycode handling code in keyboard.c and evdev.c.
Recompute keybit when keycode table changes.
Stricter checks on input keycode/scancode values.


===================================================================

drivers/char/keyboard.c | 39 ++++++++++++++++++++++-----------------
drivers/input/evdev.c | 29 ++++++++++++-----------------
include/linux/input.h | 3 +++
3 files changed, 37 insertions(+), 34 deletions(-)

===================================================================

diff -Nru a/drivers/char/keyboard.c b/drivers/char/keyboard.c
--- a/drivers/char/keyboard.c Mon Aug 26 11:14:16 2002
+++ b/drivers/char/keyboard.c Mon Aug 26 11:14:16 2002
@@ -131,39 +131,44 @@
int getkeycode(unsigned int scancode)
{
struct input_handle *handle;
- unsigned int keycode;
+ struct input_dev *dev = NULL;

for (handle = kbd_handler.handle; handle; handle = handle->hnext)
- if (handle->dev->keycodesize) break;
+ if (handle->dev->keycodesize) { dev = handle->dev; break; }

- if (!handle->dev->keycodesize)
+ if (!dev)
return -ENODEV;

- switch (handle->dev->keycodesize) {
- case 1: keycode = *(u8*)(handle->dev->keycode + scancode); break;
- case 2: keycode = *(u16*)(handle->dev->keycode + scancode * 2); break;
- case 4: keycode = *(u32*)(handle->dev->keycode + scancode * 4); break;
- default: return -EINVAL;
- }
+ if (scancode < 0 || scancode >= dev->keycodemax)
+ return -EINVAL;

- return keycode;
+ return INPUT_KEYCODE(dev, scancode);
}

int setkeycode(unsigned int scancode, unsigned int keycode)
{
struct input_handle *handle;
+ struct input_dev *dev = NULL;
+ int i, oldkey;

for (handle = kbd_handler.handle; handle; handle = handle->hnext)
- if (handle->dev->keycodesize) break;
+ if (handle->dev->keycodesize) { dev = handle->dev; break; }

- if (!handle->dev->keycodesize)
+ if (!dev)
return -ENODEV;

- switch (handle->dev->keycodesize) {
- case 1: *(u8*)(handle->dev->keycode + scancode) = keycode; break;
- case 2: *(u16*)(handle->dev->keycode + scancode * 2) = keycode; break;
- case 4: *(u32*)(handle->dev->keycode + scancode * 4) = keycode; break;
- }
+ if (scancode < 0 || scancode >= dev->keycodemax)
+ return -EINVAL;
+
+ oldkey = INPUT_KEYCODE(dev, scancode);
+ INPUT_KEYCODE(dev, scancode) = keycode;
+
+ for (i = 0; i < dev->keycodemax; i++)
+ if(INPUT_KEYCODE(dev, scancode) == oldkey)
+ break;
+ if (i == dev->keycodemax)
+ clear_bit(oldkey, dev->keybit);
+ set_bit(keycode, dev->keybit);

return 0;
}
diff -Nru a/drivers/input/evdev.c b/drivers/input/evdev.c
--- a/drivers/input/evdev.c Mon Aug 26 11:14:16 2002
+++ b/drivers/input/evdev.c Mon Aug 26 11:14:16 2002
@@ -234,7 +234,7 @@
struct evdev *evdev = list->evdev;
struct input_dev *dev = evdev->handle.dev;
struct input_absinfo abs;
- int t, u;
+ int i, t, u;

if (!evdev->exist) return -ENODEV;

@@ -258,26 +258,21 @@

case EVIOCGKEYCODE:
if (get_user(t, ((int *) arg) + 0)) return -EFAULT;
- if (t < 0 || t > dev->keycodemax) return -EINVAL;
- switch (dev->keycodesize) {
- case 1: u = *(u8*)(dev->keycode + t); break;
- case 2: u = *(u16*)(dev->keycode + t * 2); break;
- case 4: u = *(u32*)(dev->keycode + t * 4); break;
- default: return -EINVAL;
- }
- if (put_user(u, ((int *) arg) + 1)) return -EFAULT;
+ if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
+ if (put_user(INPUT_KEYCODE(dev, t), ((int *) arg) + 1)) return -EFAULT;
return 0;

case EVIOCSKEYCODE:
if (get_user(t, ((int *) arg) + 0)) return -EFAULT;
- if (t < 0 || t > dev->keycodemax) return -EINVAL;
- if (get_user(u, ((int *) arg) + 1)) return -EFAULT;
- switch (dev->keycodesize) {
- case 1: *(u8*)(dev->keycode + t) = u; break;
- case 2: *(u16*)(dev->keycode + t * 2) = u; break;
- case 4: *(u32*)(dev->keycode + t * 4) = u; break;
- default: return -EINVAL;
- }
+ if (t < 0 || t > dev->keycodemax || !dev->keycodesize) return -EINVAL;
+ u = INPUT_KEYCODE(dev, t);
+ if (get_user(INPUT_KEYCODE(dev, t), ((int *) arg) + 1)) return -EFAULT;
+
+ for (i = 0; i < dev->keycodemax; i++)
+ if(INPUT_KEYCODE(dev, t) == u) break;
+ if (i == dev->keycodemax) clear_bit(u, dev->keybit);
+ set_bit(INPUT_KEYCODE(dev, t), dev->keybit);
+
return 0;

case EVIOCSFF:
diff -Nru a/include/linux/input.h b/include/linux/input.h
--- a/include/linux/input.h Mon Aug 26 11:14:16 2002
+++ b/include/linux/input.h Mon Aug 26 11:14:16 2002
@@ -757,6 +757,9 @@
#define BIT(x) (1UL<<((x)%BITS_PER_LONG))
#define LONG(x) ((x)/BITS_PER_LONG)

+#define INPUT_KEYCODE(dev, scancode) ((dev->keycodesize == 1) ? ((u8*)dev->keycode)[scancode] : \
+ ((dev->keycodesize == 1) ? ((u16*)dev->keycode)[scancode] : (((u32*)dev->keycode)[scancode])))
+
struct input_dev {

void *private;
===================================================================
This BitKeeper patch contains the following changesets:
+
## Wrapped with gzip_uu ##


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`
end
--
Vojtech Pavlik
SuSE Labs
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