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Date: Wed, 4 Dec 2019 17:39:04 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc: Pali Rohár <pali.rohar@...il.com>,
linux-input@...r.kernel.org, linux-bluetooth@...r.kernel.org,
Luiz Augusto von Dentz <luiz.dentz@...il.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Logan Gunthorpe <logang@...tatee.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andrey Smirnov <andrew.smirnov@...il.com>,
Kirill Smelkov <kirr@...edi.com>
Subject: Re: [PATCH v3] Input: uinput - Add UI_SET_PHYS_STR and
UI_SET_UNIQ_STR
On Wed, Dec 04, 2019 at 01:55:35PM -0800, Abhishek Pandit-Subedi wrote:
> The ioctl definition for UI_SET_PHYS is ambiguous because it is defined
> with size = sizeof(char*) but is expected to be given a variable length
> string. Add a deprecation notice for UI_SET_PHYS and provide
> UI_SET_PHYS_STR(len) which expects a size from the user.
>
> Also support setting the uniq attribute of the input device. The uniq
> attribute is used as a unique identifier for the connected device.
>
> For example, uinput devices created by BlueZ will store the address of
> the connected device as the uniq property.
>
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> ---
> Hi input maintainers,
>
> Here is an updated patch that refactors the ioctl handlers (properly
> allowing the size to be set from userspace). When calling the new
> ioctls, the call signature will look like this:
>
> ```
> ioctl(fd, UI_SET_PHYS_STR(18), "00:11:22:33:44:55");
> ```
>
> I've tested this on a Chromebook running kernel v4.19 with a sample
> program compiled for both 32-bit (i.e. gcc -m32 test.c) and 64-bit.
>
> The final uinput device looks like this:
>
> ```
> udevadm info -a -p /devices/virtual/input/input18
>
> Udevadm info starts with the device specified by the devpath and then
> walks up the chain of parent devices. It prints for every device
> found, all possible attributes in the udev rules key format.
> A rule to match, can be composed by the attributes of the device
> and the attributes from one single parent device.
>
> looking at device '/devices/virtual/input/input18':
> KERNEL=="input18"
> SUBSYSTEM=="input"
> DRIVER==""
> ATTR{inhibited}=="0"
> ATTR{name}=="Test"
> ATTR{phys}=="00:00:00:33:44:55"
> ATTR{properties}=="0"
> ATTR{uniq}=="00:11:22:00:00:00"
>
> ```
>
>
> Changes in v3:
> - Added UI_SET_PHYS_STR(len) and UI_SET_UNIQ_STR(len) and added
> deprecation notice for UI_SET_PHYS
>
> Changes in v2:
> - Added compat handling for UI_SET_UNIQ
>
> drivers/input/misc/uinput.c | 41 ++++++++++++++++++++++++++++++++++++-
> include/uapi/linux/uinput.h | 5 +++++
> 2 files changed, 45 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c
> index 84051f20b18a..27a750896c71 100644
> --- a/drivers/input/misc/uinput.c
> +++ b/drivers/input/misc/uinput.c
> @@ -20,6 +20,7 @@
> */
> #include <uapi/linux/uinput.h>
> #include <linux/poll.h>
> +#include <linux/printk.h>
> #include <linux/sched.h>
> #include <linux/slab.h>
> #include <linux/module.h>
> @@ -280,7 +281,7 @@ static int uinput_dev_flush(struct input_dev *dev, struct file *file)
>
> static void uinput_destroy_device(struct uinput_device *udev)
> {
> - const char *name, *phys;
> + const char *name, *phys, *uniq;
> struct input_dev *dev = udev->dev;
> enum uinput_state old_state = udev->state;
>
> @@ -289,6 +290,7 @@ static void uinput_destroy_device(struct uinput_device *udev)
> if (dev) {
> name = dev->name;
> phys = dev->phys;
> + uniq = dev->uniq;
> if (old_state == UIST_CREATED) {
> uinput_flush_requests(udev);
> input_unregister_device(dev);
> @@ -297,6 +299,7 @@ static void uinput_destroy_device(struct uinput_device *udev)
> }
> kfree(name);
> kfree(phys);
> + kfree(uniq);
> udev->dev = NULL;
> }
> }
> @@ -840,6 +843,7 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
> struct uinput_ff_erase ff_erase;
> struct uinput_request *req;
> char *phys;
> + char *uniq;
> const char *name;
> unsigned int size;
>
> @@ -916,6 +920,8 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
> goto out;
>
> case UI_SET_PHYS:
> + pr_warn_once("uinput: UI_SET_PHYS is deprecated. Use UI_SET_PHYS_STR");
> +
> if (udev->state == UIST_CREATED) {
> retval = -EINVAL;
> goto out;
> @@ -1023,6 +1029,39 @@ static long uinput_ioctl_handler(struct file *file, unsigned int cmd,
> case UI_ABS_SETUP & ~IOCSIZE_MASK:
> retval = uinput_abs_setup(udev, p, size);
> goto out;
> +
> + case UI_SET_PHYS_STR(0):
> + if (udev->state == UIST_CREATED) {
> + retval = -EINVAL;
> + goto out;
> + }
> +
> + phys = strndup_user(p, size);
> + if (IS_ERR(phys)) {
> + retval = PTR_ERR(phys);
> + goto out;
> + }
> +
> + kfree(udev->dev->phys);
> + udev->dev->phys = phys;
Could we maybe refactor this into uinput_get_user_str(udev,
&udev->dev->phys, p, size) ?
> + goto out;
> +
> + case UI_SET_UNIQ_STR(0):
> + if (udev->state == UIST_CREATED) {
> + retval = -EINVAL;
> + goto out;
> + }
> +
> + uniq = strndup_user(p, size);
> + if (IS_ERR(uniq)) {
> + retval = PTR_ERR(uniq);
> + goto out;
> + }
> +
> + kfree(udev->dev->uniq);
> + udev->dev->uniq = uniq;
> + goto out;
> +
> }
>
> retval = -EINVAL;
> diff --git a/include/uapi/linux/uinput.h b/include/uapi/linux/uinput.h
> index c9e677e3af1d..84d4fa142830 100644
> --- a/include/uapi/linux/uinput.h
> +++ b/include/uapi/linux/uinput.h
> @@ -142,9 +142,14 @@ struct uinput_abs_setup {
> #define UI_SET_LEDBIT _IOW(UINPUT_IOCTL_BASE, 105, int)
> #define UI_SET_SNDBIT _IOW(UINPUT_IOCTL_BASE, 106, int)
> #define UI_SET_FFBIT _IOW(UINPUT_IOCTL_BASE, 107, int)
> +
> +/* DEPRECATED: Data size is ambiguous. Use UI_SET_PHYS_STR instead. */
> #define UI_SET_PHYS _IOW(UINPUT_IOCTL_BASE, 108, char*)
> +
> #define UI_SET_SWBIT _IOW(UINPUT_IOCTL_BASE, 109, int)
> #define UI_SET_PROPBIT _IOW(UINPUT_IOCTL_BASE, 110, int)
> +#define UI_SET_PHYS_STR(len) _IOC(_IOC_WRITE, UINPUT_IOCTL_BASE, 111, len)
> +#define UI_SET_UNIQ_STR(len) _IOC(_IOC_WRITE, UINPUT_IOCTL_BASE, 112, len)
>
> #define UI_BEGIN_FF_UPLOAD _IOWR(UINPUT_IOCTL_BASE, 200, struct uinput_ff_upload)
> #define UI_END_FF_UPLOAD _IOW(UINPUT_IOCTL_BASE, 201, struct uinput_ff_upload)
> --
> 2.24.0.393.g34dc348eaf-goog
>
--
Dmitry
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