kernel/linux.git/drivers/input/misc/uinput.c, branch v3.16.76

Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD

2019-10-05T15:19:45+00:00

commit 7c7da40da1640ce6814dab1e8031b44e19e5a3f6 upstream. In the case of compat syscall ioctl numbers for UI_BEGIN_FF_UPLOAD and UI_END_FF_UPLOAD need to be adjusted before being passed on uinput_ioctl_handler() since code built with -m32 will be passing slightly different values. Extend the code already covering UI_SET_PHYS to cover UI_BEGIN_FF_UPLOAD and UI_END_FF_UPLOAD as well. Reported-by: Pierre-Loup A. Griffais Signed-off-by: Andrey Smirnov Signed-off-by: Dmitry Torokhov Signed-off-by: Ben Hutchings

Input: uinput - avoid crash when sending FF request to device going away

2018-01-01T20:51:36+00:00

commit 6b4877c7bdc6ae39ce03716df7caeecf204697eb upstream. If FF request comes in while uinput device is going away, uinput_request_send() will fail with -ENODEV, and uinput_request_submit() will attempt to mark the slot as unused by calling uinput_request_done(). Unfortunately in this case we haven't initialized request->done completion yet, and we get a crash: [ 39.402036] BUG: spinlock bad magic on CPU#1, fftest/3108 [ 39.402046] lock: 0xffff88006a93bb00, .magic: 00000000, .owner: /39, .owner_cpu: 1217155072 [ 39.402055] CPU: 1 PID: 3108 Comm: fftest Tainted: G W 4.13.0+ #15 [ 39.402059] Hardware name: LENOVO 20HQS0EG02/20HQS0EG02, BIOS N1MET37W (1.22 ) 07/04/2017 [ 39.402064] 0000000000000086 f0fad82f3ceaa120 ffff88006a93b9a0 ffffffff9de941bb [ 39.402077] ffff88026df8ae00 ffff88006a93bb00 ffff88006a93b9c0 ffffffff9dca62b7 [ 39.402088] ffff88006a93bb00 ffff88006a93baf8 ffff88006a93b9e0 ffffffff9dca62e7 [ 39.402099] Call Trace: [ 39.402112] [] dump_stack+0x4d/0x63 [ 39.402123] [] spin_dump+0x97/0x9c [ 39.402130] [] spin_bug+0x2b/0x2d [ 39.402138] [] do_raw_spin_lock+0x28/0xfd [ 39.402147] [] _raw_spin_lock_irqsave+0x19/0x1f [ 39.402154] [] complete+0x1d/0x48 [ 39.402162] [] 0xffffffffc04f30af [ 39.402167] [] 0xffffffffc04f468c [ 39.402177] [] ? __slab_free+0x22f/0x359 [ 39.402184] [] ? tk_clock_read+0xc/0xe [ 39.402189] [] 0xffffffffc04f471f [ 39.402195] [] ? __wake_up+0x44/0x4b [ 39.402200] [] ? 0xffffffffc04f3240 [ 39.402207] [] erase_effect+0xa1/0xd2 [ 39.402214] [] input_ff_flush+0x43/0x5c [ 39.402219] [] 0xffffffffc04f32ad [ 39.402227] [] input_flush_device+0x3d/0x51 [ 39.402234] [] evdev_flush+0x49/0x5c [ 39.402243] [] filp_close+0x3f/0x65 [ 39.402253] [] put_files_struct+0x66/0xc1 [ 39.402261] [] exit_files+0x47/0x4e [ 39.402270] [] do_exit+0x483/0x969 [ 39.402278] [] ? recalc_sigpending_tsk+0x3d/0x44 [ 39.402285] [] do_group_exit+0x42/0xb0 [ 39.402293] [] get_signal+0x58d/0x5bf [ 39.402300] [] do_signal+0x37/0x53e [ 39.402307] [] ? evdev_ioctl_handler+0xac8/0xb04 [ 39.402314] [] ? evdev_ioctl+0x10/0x12 [ 39.402321] [] ? do_vfs_ioctl+0x42e/0x501 [ 39.402328] [] prepare_exit_to_usermode+0x66/0x90 [ 39.402333] [] syscall_return_slowpath+0xe3/0xec [ 39.402339] [] int_ret_from_sys_call+0x25/0x8f While we could solve this by simply initializing the completion earlier, we are better off rearranging the code a bit so we avoid calling complete() on requests that we did not send out. This patch consolidates marking request slots as free in one place (in uinput_request_submit(), the same place where we acquire them) and having everyone else simply signal completion of the requests. Fixes: 00ce756ce53a ("Input: uinput - mark failed submission requests as free") Signed-off-by: Dmitry Torokhov Signed-off-by: Ben Hutchings

Input: uinput - avoid FF flush when destroying device

2018-01-01T20:51:36+00:00

commit e8b95728f724797f958912fd9b765a695595d3a6 upstream. Normally, when input device supporting force feedback effects is being destroyed, we try to "flush" currently playing effects, so that the physical device does not continue vibrating (or executing other effects). Unfortunately this does not work well for uinput as flushing of the effects deadlocks with the destroy action: - if device is being destroyed because the file descriptor is being closed, then there is noone to even service FF requests; - if device is being destroyed because userspace sent UI_DEV_DESTROY, while theoretically it could be possible to service FF requests, userspace is unlikely to do so (they'd need to make sure FF handling happens on a separate thread) even if kernel solves the issue with FF ioctls deadlocking with UI_DEV_DESTROY ioctl on udev->mutex. To avoid lockups like the one below, let's install a custom input device flush handler, and avoid trying to flush force feedback effects when we destroying the device, and instead rely on uinput to shut off the device properly. NMI watchdog: Watchdog detected hard LOCKUP on cpu 3 ... <> [] _raw_spin_lock_irqsave+0x37/0x40 [] complete+0x1d/0x50 [] uinput_request_done+0x3c/0x40 [uinput] [] uinput_request_submit.part.7+0x47/0xb0 [uinput] [] uinput_dev_erase_effect+0x5b/0x76 [uinput] [] erase_effect+0xad/0xf0 [] flush_effects+0x4d/0x90 [] input_flush_device+0x40/0x60 [] evdev_cleanup+0xac/0xc0 [] evdev_disconnect+0x2b/0x60 [] __input_unregister_device+0xac/0x150 [] input_unregister_device+0x47/0x70 [] uinput_destroy_device+0xb5/0xc0 [uinput] [] uinput_ioctl_handler.isra.9+0x65e/0x740 [uinput] [] ? do_futex+0x12b/0xad0 [] uinput_ioctl+0x18/0x20 [uinput] [] do_vfs_ioctl+0x298/0x480 [] ? security_file_ioctl+0x43/0x60 [] SyS_ioctl+0x79/0x90 [] entry_SYSCALL_64_fastpath+0x12/0x71 Reported-by: Rodrigo Rivas Costa Reported-by: Clément VUCHENER Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=193741 Signed-off-by: Dmitry Torokhov Signed-off-by: Ben Hutchings

Input: uinput - handle compat ioctl for UI_SET_PHYS

2016-08-22T21:38:03+00:00

commit affa80bd97f7ca282d1faa91667b3ee9e4c590e6 upstream. When running a 32-bit userspace on a 64-bit kernel, the UI_SET_PHYS ioctl needs to be treated with special care, as it has the pointer size encoded in the command. Signed-off-by: Ricky Liang Signed-off-by: Dmitry Torokhov Signed-off-by: Ben Hutchings

Input: uinput - add UI_GET_SYSNAME ioctl to retrieve the sysfs path

2014-02-12T23:00:34+00:00

uinput is used in the xorg-integration-tests suite and in the wayland test suite. These automated tests suites create many virtual input devices and then hook something to read these newly created devices. Currently, uinput does not provide the created input device, which means that we rely on an heuristic to guess which input node was created. The problem is that is heuristic is subjected to races between different uinput devices or even with physical devices. Having a way to retrieve the sysfs path allows us to find without any doubts the event node. Signed-off-by: Benjamin Tissoires Reviewed-by: David Herrmann Signed-off-by: Dmitry Torokhov

Input: uinput - breaks by goto out in uinput_ioctl_handler

2014-01-31T01:30:57+00:00

The current implementation prevents us to add variable-length ioctl. Use a bunch of gotos instead of break to allow us to do so. No functional changes. Signed-off-by: Benjamin Tisssoires Reviewed-by: David Herrmann Signed-off-by: Dmitry Torokhov

Input: uinput - support injecting multiple events in one write() call

2013-09-19T15:57:56+00:00

Rework the code in uinput_inject_event so that it matches the code in evdev_write and allows injecting more than one event, or zero events. Signed-off-by: Ryan Mallon Signed-off-by: Dmitry Torokhov

Merge branch 'for-next' of git://github.com/rydberg/linux into next

2012-10-01T21:40:51+00:00

Merge Henrik's updates to multitouch code. Even though Jiri already pulled them in I need to do it too since my changes to evdev using dynamic major would clash with them.

Input: MT - Add flags to input_mt_init_slots()

2012-09-19T17:50:18+00:00

Preparing to move more repeated code into the mt core, add a flags argument to the input_mt_slots_init() function. Reviewed-and-tested-by: Benjamin Tissoires Tested-by: Ping Cheng Acked-by: Dmitry Torokhov Signed-off-by: Henrik Rydberg

Input: uinput - fix formatting

2012-08-22T05:29:55+00:00

Reformat the code to keep it within 80 columns. Signed-off-by: Dmitry Torokhov