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KASAN: slab-out-of-bounds Write in snd_usb_mixer_interrupt

Status: fixed on 2020/07/17 17:58
Subsystems: sound usb
[Documentation on labels]
Reported-by: syzbot+2405ca3401e943c538b5@syzkaller.appspotmail.com
Fix commit: 220345e98f1c ALSA: usb-audio: Fix OOB access of mixer element list
First crash: 1407d, last: 1401d
Cause bisection: introduced by (bisect log) [ignored commit]:
commit f2c2e717642c66f7fe7e5dd69b2e8ff5849f4d10
Author: Andrey Konovalov <andreyknvl@google.com>
Date: Mon Feb 24 16:13:03 2020 +0000

  usb: gadget: add raw-gadget interface

Crash: KASAN: slab-out-of-bounds Write in snd_usb_mixer_notify_id (log)
Repro: C syz .config
  
▶ ▼ Discussions (7)
Title Replies (including bot) Last reply
[PATCH 4.19 000/131] 4.19.131-rc1 review 148 (148) 2020/07/05 13:30
[PATCH 5.7 000/265] 5.7.7-rc1 review 280 (280) 2020/07/01 15:34
[PATCH 4.9 000/191] 4.9.229-rc1 review 199 (199) 2020/07/01 06:45
[PATCH 5.4 000/178] 5.4.50-rc1 review 182 (182) 2020/06/30 17:22
[PATCH 4.14 00/78] 4.14.186-rc1 review 83 (83) 2020/06/30 17:21
[PATCH 4.4 000/135] 4.4.229-rc1 review 140 (140) 2020/06/30 17:20
KASAN: slab-out-of-bounds Write in snd_usb_mixer_interrupt 0 (1) 2020/06/23 21:08
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-54 KASAN: slab-out-of-bounds Write in snd_usb_mixer_interrupt C 4 1397d 1407d 1/2 fixed on 2021/10/13 19:27

Sample crash report:
==================================================================
BUG: KASAN: slab-out-of-bounds in snd_usb_mixer_notify_id sound/usb/mixer.c:3240 [inline]
BUG: KASAN: slab-out-of-bounds in snd_usb_mixer_interrupt+0xaa7/0xc30 sound/usb/mixer.c:3379
Write of size 4 at addr ffff8880a39c5ae0 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 snd_usb_mixer_notify_id sound/usb/mixer.c:3240 [inline]
 snd_usb_mixer_interrupt+0xaa7/0xc30 sound/usb/mixer.c:3379
 __usb_hcd_giveback_urb+0x333/0x4b0 drivers/usb/core/hcd.c:1650
 dummy_timer+0x75c/0x3ff0 drivers/usb/gadget/udc/dummy_hcd.c:1966
 call_timer_fn+0x91/0x160 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers+0x776/0x970 kernel/time/timer.c:1773
 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786
 __do_softirq+0x268/0x80c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x223/0x230 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1107
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: 80 e1 07 80 c1 03 38 c1 7c bc 48 89 df e8 9a 17 9b f9 eb b2 cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 56 46 4a 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 46 46 4a 00 f4 c3 cc cc 41 56 53 65
RSP: 0018:ffffffff89207d48 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff12577b9 RBX: 0000000000000000 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff89282364
RBP: 1ffff1104351204e R08: ffffffff817a4660 R09: fffffbfff1250361
R10: fffffbfff1250361 R11: 0000000000000000 R12: 0000000000000001
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88821a890270
 arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
 acpi_safe_halt+0x87/0xe0 drivers/acpi/processor_idle.c:111
 acpi_idle_do_entry drivers/acpi/processor_idle.c:525 [inline]
 acpi_idle_enter+0x3f4/0xac0 drivers/acpi/processor_idle.c:651
 cpuidle_enter_state+0x2d7/0x7b0 drivers/cpuidle/cpuidle.c:234
 cpuidle_enter+0x59/0x90 drivers/cpuidle/cpuidle.c:345
 call_cpuidle kernel/sched/idle.c:117 [inline]
 cpuidle_idle_call kernel/sched/idle.c:207 [inline]
 do_idle+0x49c/0x650 kernel/sched/idle.c:269
 cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:365
 start_kernel+0x674/0x777 init/main.c:1041
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242

Allocated by task 12:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 kmem_cache_alloc_trace+0x234/0x300 mm/slab.c:3551
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:669 [inline]
 add_single_ctl_with_resume sound/usb/mixer_quirks.c:147 [inline]
 snd_mbox1_create_sync_switch sound/usb/mixer_quirks.c:719 [inline]
 snd_usb_mixer_apply_create_quirk+0x1333/0x4fc0 sound/usb/mixer_quirks.c:2654
 snd_usb_create_mixer+0x22d8/0x2e90 sound/usb/mixer.c:3538
 snd_usb_create_quirk sound/usb/quirks.c:563 [inline]
 create_composite_quirk+0x221/0x510 sound/usb/quirks.c:48
 usb_audio_probe+0xc3d/0x2500 sound/usb/card.c:668
 usb_probe_interface+0x614/0xac0 drivers/usb/core/driver.c:374
 really_probe+0x761/0xf60 drivers/base/dd.c:524
 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697
 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431
 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870
 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491
 device_add+0x1828/0x1ba0 drivers/base/core.c:2557
 usb_set_configuration+0x19d2/0x1f20 drivers/usb/core/message.c:2032
 usb_generic_driver_probe+0x82/0x140 drivers/usb/core/generic.c:241
 usb_probe_device+0x12d/0x1d0 drivers/usb/core/driver.c:272
 really_probe+0x761/0xf60 drivers/base/dd.c:524
 driver_probe_device+0xe6/0x230 drivers/base/dd.c:697
 bus_for_each_drv+0x108/0x170 drivers/base/bus.c:431
 __device_attach+0x20c/0x3a0 drivers/base/dd.c:870
 bus_probe_device+0xb8/0x1f0 drivers/base/bus.c:491
 device_add+0x1828/0x1ba0 drivers/base/core.c:2557
 usb_new_device+0xcc3/0x1650 drivers/usb/core/hub.c:2554
 hub_port_connect drivers/usb/core/hub.c:5208 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5348 [inline]
 port_event drivers/usb/core/hub.c:5494 [inline]
 hub_event+0x2823/0x4cb0 drivers/usb/core/hub.c:5576
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351

Freed by task 4844:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 tomoyo_path_perm+0x59b/0x740 security/tomoyo/file.c:842
 security_inode_getattr+0xc0/0x140 security/security.c:1278
 vfs_getattr fs/stat.c:121 [inline]
 vfs_statx_fd fs/stat.c:151 [inline]
 vfs_fstat include/linux/fs.h:3319 [inline]
 __do_sys_newfstat fs/stat.c:398 [inline]
 __se_sys_newfstat fs/stat.c:395 [inline]
 __x64_sys_newfstat+0x97/0x150 fs/stat.c:395
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

The buggy address belongs to the object at ffff8880a39c5a80
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 32 bytes to the right of
 64-byte region [ffff8880a39c5a80, ffff8880a39c5ac0)
The buggy address belongs to the page:
page:ffffea00028e7140 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea000299a688 ffffea00028e3948 ffff8880aa400380
raw: 0000000000000000 ffff8880a39c5000 0000000100000020 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a39c5980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a39c5a00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
>ffff8880a39c5a80: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
                                                       ^
 ffff8880a39c5b00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff8880a39c5b80: 00 00 00 00 01 fc fc fc fc fc fc fc fc fc fc fc
==================================================================

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/06/19 21:03 upstream 7ae77150d94d 81abc331 .config console log report syz C ci-upstream-kasan-gce-smack-root
2020/06/25 13:39 upstream 7ae77150d94d 54566aff .config console log report syz C ci-upstream-kasan-gce-386
2020/06/25 14:37 upstream 7ae77150d94d 54566aff .config console log report ci-upstream-kasan-gce-smack-root
2020/06/24 14:33 upstream 7ae77150d94d 54566aff .config console log report ci-upstream-kasan-gce-smack-root
2020/06/24 08:45 upstream 7ae77150d94d 54566aff .config console log report ci-upstream-kasan-gce-smack-root
* Struck through repros no longer work on HEAD.