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The HID report buffers that are initially allocated on i2c_hid_probe() might not be big enough to hold the HID reports from a specific device, in which case they will be freed and new ones will be allocated in i2c_hid_start(), at point which the device's report size is known. But at this point ihid->irq is already running, and may call i2c_hid_get_input() which passes ihid->inbuf to i2c_master_recv(). Since this handler runs in a separate thread, ihid->inbuf may be freed at this very moment, and i2c_master_recv() will write on memory which may be already owned by a different part of the kernel, corrupting its data. This problem has been observed on an Asus UX360UA laptop which has an I2C touchpad, and results in a complete system freeze or an unusable slowness with a lof of "BUG: unable to handle kernel paging request at <address>" warnings. Enabling SLUB debugging shows a use-after-free warning on memory allocated in i2c_hid_alloc_buffers() and freed in i2c_hid_free_buffers(): ============================================================================= BUG kmalloc-64 (Not tainted): Poison overwritten ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: 0xffff880264083273-0xffff88026408329e. first byte 0x0 instead of 0x6b INFO: Allocated in i2c_hid_alloc_buffers+0x25/0xa0 [i2c_hid] age=35793 cpu=2 pid=430 ___slab_alloc+0x41e/0x460 __slab_alloc+0x20/0x40 __kmalloc+0x210/0x280 i2c_hid_alloc_buffers+0x25/0xa0 [i2c_hid] i2c_hid_probe+0x12f/0x5e0 [i2c_hid] i2c_device_probe+0x10a/0x1b0 driver_probe_device+0x220/0x4a0 __device_attach_driver+0x71/0xa0 bus_for_each_drv+0x67/0xb0 __device_attach+0xdc/0x170 device_initial_probe+0x13/0x20 bus_probe_device+0x92/0xa0 device_add+0x4aa/0x670 device_register+0x1a/0x20 i2c_new_device+0x18e/0x230 acpi_i2c_add_device+0x1a0/0x210 INFO: Freed in i2c_hid_free_buffers+0x16/0x60 [i2c_hid] age=7552 cpu=1 pid=1473 __slab_free+0x221/0x330 kfree+0x139/0x160 i2c_hid_free_buffers+0x16/0x60 [i2c_hid] i2c_hid_start+0x2a9/0x2df [i2c_hid] mt_probe+0x160/0x22e [hid_multitouch] hid_device_probe+0xd7/0x150 [hid] driver_probe_device+0x220/0x4a0 __driver_attach+0x84/0x90 bus_for_each_dev+0x6c/0xc0 driver_attach+0x1e/0x20 bus_add_driver+0x1c3/0x280 driver_register+0x60/0xe0 __hid_register_driver+0x53/0x90 [hid] 0xffffffffc004f01e do_one_initcall+0xb3/0x1f0 do_init_module+0x5f/0x1d0 INFO: Slab 0xffffea0009902080 objects=20 used=20 fp=0x (null) flags=0x17fff8000004080 INFO: Object 0xffff880264083260 @offset=4704 fp=0x (null) Bytes b4 ffff880264083250: 8d e6 fe ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a ........ZZZZZZZZ Object ffff880264083260: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff880264083270: 6b 6b 6b 00 00 00 00 00 00 00 00 00 00 00 00 00 kkk............. Object ffff880264083280: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Object ffff880264083290: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ Redzone ffff8802640832a0: bb bb bb bb bb bb bb bb ........ Padding ffff8802640833e0: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ CPU: 1 PID: 1503 Comm: python3 Tainted: G B 4.4.21+ #10 Hardware name: ASUSTeK COMPUTER INC. UX360UA/UX360UA, BIOS UX360UA.200 05/05/2016 0000000000000086 00000000622d48a2 ffff88026061ba38 ffffffff813f6044 ffff880264082010 ffff880264083260 ffff88026061ba78 ffffffff811e8eab 0000000000000008 ffff880200000001 ffff88026408329f ffff88026a007700 Call Trace: [<ffffffff813f6044>] dump_stack+0x63/0x8f [<ffffffff811e8eab>] print_trailer+0x14b/0x1f0 [<ffffffff811e94c1>] check_bytes_and_report+0xc1/0x100 [<ffffffff811e96c4>] check_object+0x1c4/0x240 [<ffffffff81293fde>] ? ext4_htree_store_dirent+0x3e/0x120 [<ffffffff811e9b44>] alloc_debug_processing+0x104/0x180 [<ffffffff811eb7be>] ___slab_alloc+0x41e/0x460 [<ffffffff81293fde>] ? ext4_htree_store_dirent+0x3e/0x120 [<ffffffff8124590b>] ? __getblk_gfp+0x2b/0x60 [<ffffffff8129b969>] ? ext4_getblk+0xa9/0x190 [<ffffffff811eb820>] __slab_alloc+0x20/0x40 [<ffffffff811ed320>] __kmalloc+0x210/0x280 [<ffffffff81293fde>] ? ext4_htree_store_dirent+0x3e/0x120 [<ffffffff812c1602>] ? ext4fs_dirhash+0xc2/0x2a0 [<ffffffff81293fde>] ext4_htree_store_dirent+0x3e/0x120 [<ffffffff812a4f47>] htree_dirblock_to_tree+0x187/0x1b0 [<ffffffff812a5fd2>] ext4_htree_fill_tree+0xb2/0x2e0 [<ffffffff811ebb7a>] ? kmem_cache_alloc_trace+0x1fa/0x220 [<ffffffff81293e45>] ? ext4_readdir+0x775/0x8b0 [<ffffffff81293cb1>] ext4_readdir+0x5e1/0x8b0 [<ffffffff81221c82>] iterate_dir+0x92/0x120 [<ffffffff81222118>] SyS_getdents+0x98/0x110 [<ffffffff81221d10>] ? iterate_dir+0x120/0x120 [<ffffffff818157f2>] entry_SYSCALL_64_fastpath+0x16/0x71 FIX kmalloc-64: Restoring 0xffff880264083273-0xffff88026408329e=0x6b FIX kmalloc-64: Marking all objects used Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz> |
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| .. | ||
| i2c-hid | ||
| intel-ish-hid | ||
| usbhid | ||
| hid-a4tech.c | ||
| hid-alps.c | ||
| hid-apple.c | ||
| hid-appleir.c | ||
| hid-asus.c | ||
| hid-aureal.c | ||
| hid-axff.c | ||
| hid-belkin.c | ||
| hid-betopff.c | ||
| hid-cherry.c | ||
| hid-chicony.c | ||
| hid-cmedia.c | ||
| hid-core.c | ||
| hid-corsair.c | ||
| hid-cp2112.c | ||
| hid-cypress.c | ||
| hid-debug.c | ||
| hid-dr.c | ||
| hid-elecom.c | ||
| hid-elo.c | ||
| hid-emsff.c | ||
| hid-ezkey.c | ||
| hid-gaff.c | ||
| hid-gembird.c | ||
| hid-generic.c | ||
| hid-gfrm.c | ||
| hid-gt683r.c | ||
| hid-gyration.c | ||
| hid-holtek-kbd.c | ||
| hid-holtek-mouse.c | ||
| hid-holtekff.c | ||
| hid-hyperv.c | ||
| hid-icade.c | ||
| hid-ids.h | ||
| hid-input.c | ||
| hid-kensington.c | ||
| hid-keytouch.c | ||
| hid-kye.c | ||
| hid-lcpower.c | ||
| hid-led.c | ||
| hid-lenovo.c | ||
| hid-lg2ff.c | ||
| hid-lg3ff.c | ||
| hid-lg4ff.c | ||
| hid-lg4ff.h | ||
| hid-lg.c | ||
| hid-lg.h | ||
| hid-lgff.c | ||
| hid-logitech-dj.c | ||
| hid-logitech-hidpp.c | ||
| hid-magicmouse.c | ||
| hid-microsoft.c | ||
| hid-monterey.c | ||
| hid-multitouch.c | ||
| hid-ntrig.c | ||
| hid-ortek.c | ||
| hid-penmount.c | ||
| hid-petalynx.c | ||
| hid-picolcd_backlight.c | ||
| hid-picolcd_cir.c | ||
| hid-picolcd_core.c | ||
| hid-picolcd_debugfs.c | ||
| hid-picolcd_fb.c | ||
| hid-picolcd_lcd.c | ||
| hid-picolcd_leds.c | ||
| hid-picolcd.h | ||
| hid-pl.c | ||
| hid-plantronics.c | ||
| hid-primax.c | ||
| hid-prodikeys.c | ||
| hid-rmi.c | ||
| hid-roccat-arvo.c | ||
| hid-roccat-arvo.h | ||
| hid-roccat-common.c | ||
| hid-roccat-common.h | ||
| hid-roccat-isku.c | ||
| hid-roccat-isku.h | ||
| hid-roccat-kone.c | ||
| hid-roccat-kone.h | ||
| hid-roccat-koneplus.c | ||
| hid-roccat-koneplus.h | ||
| hid-roccat-konepure.c | ||
| hid-roccat-kovaplus.c | ||
| hid-roccat-kovaplus.h | ||
| hid-roccat-lua.c | ||
| hid-roccat-lua.h | ||
| hid-roccat-pyra.c | ||
| hid-roccat-pyra.h | ||
| hid-roccat-ryos.c | ||
| hid-roccat-savu.c | ||
| hid-roccat-savu.h | ||
| hid-roccat.c | ||
| hid-saitek.c | ||
| hid-samsung.c | ||
| hid-sensor-custom.c | ||
| hid-sensor-hub.c | ||
| hid-sjoy.c | ||
| hid-sony.c | ||
| hid-speedlink.c | ||
| hid-steelseries.c | ||
| hid-sunplus.c | ||
| hid-tivo.c | ||
| hid-tmff.c | ||
| hid-topseed.c | ||
| hid-twinhan.c | ||
| hid-uclogic.c | ||
| hid-waltop.c | ||
| hid-wiimote-core.c | ||
| hid-wiimote-debug.c | ||
| hid-wiimote-modules.c | ||
| hid-wiimote.h | ||
| hid-xinmo.c | ||
| hid-zpff.c | ||
| hid-zydacron.c | ||
| hidraw.c | ||
| Kconfig | ||
| Makefile | ||
| uhid.c | ||
| wacom_sys.c | ||
| wacom_wac.c | ||
| wacom_wac.h | ||
| wacom.h | ||