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* KASAN: use-after-free Read in chaoskey_disconnect
@ 2019-10-30 12:52 syzbot
  2019-11-15 18:19 ` Stephen Boyd
  2020-06-18 12:12 ` Andrey Konovalov
  0 siblings, 2 replies; 4+ messages in thread
From: syzbot @ 2019-10-30 12:52 UTC (permalink / raw)
  To: alexandre.belloni, andreyknvl, arnd, gregkh, herbert,
	linux-crypto, linux-kernel, linux-usb, lvivier, mchehab+samsung,
	mpm, swboyd, syzkaller-bugs, tytso

Hello,

syzbot found the following crash on:

HEAD commit:    ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=15e1ba24e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
dashboard link: https://syzkaller.appspot.com/bug?extid=6d8505fcdf25f00ac276
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169b8904e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=166f3104e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6d8505fcdf25f00ac276@syzkaller.appspotmail.com

usb 3-1: string descriptor 0 read error: -71
usb 3-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: use-after-free in atomic_read  
include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x72/0x1e0  
lib/refcount.c:123
Read of size 4 at addr ffff8881cf679820 by task kworker/1:1/1730

CPU: 1 PID: 1730 Comm: kworker/1:1 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
  __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
  kasan_report+0xe/0x20 mm/kasan/common.c:634
  check_memory_region_inline mm/kasan/generic.c:185 [inline]
  check_memory_region+0x128/0x190 mm/kasan/generic.c:192
  atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
  refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123
  refcount_inc_checked+0x12/0x60 lib/refcount.c:156
  get_task_struct include/linux/sched/task.h:110 [inline]
  kthread_stop+0x6c/0x610 kernel/kthread.c:554
  hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538
  chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232
  usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
  __device_release_driver drivers/base/dd.c:1134 [inline]
  device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
  device_del+0x420/0xb20 drivers/base/core.c:2376
  usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
  usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200
  hub_port_connect drivers/usb/core/hub.c:5035 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
  port_event drivers/usb/core/hub.c:5470 [inline]
  hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 2:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_kmalloc mm/kasan/common.c:510 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
  slab_post_alloc_hook mm/slab.h:584 [inline]
  slab_alloc_node mm/slub.c:2779 [inline]
  kmem_cache_alloc_node+0xdc/0x310 mm/slub.c:2815
  alloc_task_struct_node kernel/fork.c:169 [inline]
  dup_task_struct kernel/fork.c:865 [inline]
  copy_process+0x4201/0x6470 kernel/fork.c:1851
  _do_fork+0x129/0xec0 kernel/fork.c:2366
  kernel_thread+0xaa/0xe0 kernel/fork.c:2453
  create_kthread kernel/kthread.c:278 [inline]
  kthreadd+0x4a2/0x680 kernel/kthread.c:596
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 16:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  kasan_set_free_info mm/kasan/common.c:332 [inline]
  __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
  slab_free_hook mm/slub.c:1424 [inline]
  slab_free_freelist_hook mm/slub.c:1475 [inline]
  slab_free mm/slub.c:3025 [inline]
  kmem_cache_free+0xb9/0x380 mm/slub.c:3041
  __put_task_struct+0x1e2/0x4c0 kernel/fork.c:748
  put_task_struct include/linux/sched/task.h:119 [inline]
  delayed_put_task_struct+0x1b4/0x2c0 kernel/exit.c:182
  __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
  rcu_do_batch kernel/rcu/tree.c:2157 [inline]
  rcu_core+0x630/0x1ca0 kernel/rcu/tree.c:2377
  __do_softirq+0x221/0x912 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881cf679800
  which belongs to the cache task_struct of size 5888
The buggy address is located 32 bytes inside of
  5888-byte region [ffff8881cf679800, ffff8881cf67af00)
The buggy address belongs to the page:
page:ffffea00073d9e00 refcount:1 mapcount:0 mapping:ffff8881da116000  
index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da116000
raw: 0000000000000000 0000000080050005 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881cf679700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8881cf679780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881cf679800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                ^
  ffff8881cf679880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8881cf679900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: KASAN: use-after-free Read in chaoskey_disconnect
  2019-10-30 12:52 KASAN: use-after-free Read in chaoskey_disconnect syzbot
@ 2019-11-15 18:19 ` Stephen Boyd
  2019-11-16  5:55   ` syzbot
  2020-06-18 12:12 ` Andrey Konovalov
  1 sibling, 1 reply; 4+ messages in thread
From: Stephen Boyd @ 2019-11-15 18:19 UTC (permalink / raw)
  To: alexandre.belloni, andreyknvl, arnd, gregkh, herbert,
	linux-crypto, linux-kernel, linux-usb, lvivier, mchehab+samsung,
	mpm, syzbot, syzkaller-bugs, tytso

Quoting syzbot (2019-10-30 05:52:08)
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e1ba24e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
> dashboard link: https://syzkaller.appspot.com/bug?extid=6d8505fcdf25f00ac276
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169b8904e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=166f3104e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+6d8505fcdf25f00ac276@syzkaller.appspotmail.com
> 

Ok, let's try that again

#syz test: https://github.com/google/kasan.git ff6409a6

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 5b799aa973a3..c487709499fc 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -2440,8 +2440,8 @@ void add_hwgenerator_randomness(const char *buffer, size_t count,
 	 * We'll be woken up again once below random_write_wakeup_thresh,
 	 * or when the calling thread is about to terminate.
 	 */
-	wait_event_freezable(random_write_wait,
-			kthread_should_stop() ||
+	wait_event_interruptible(random_write_wait,
+			kthread_should_stop() || freezing(current) ||
 			ENTROPY_BITS(&input_pool) <= random_write_wakeup_bits);
 	mix_pool_bytes(poolp, buffer, count);
 	credit_entropy_bits(poolp, entropy);

^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: KASAN: use-after-free Read in chaoskey_disconnect
  2019-11-15 18:19 ` Stephen Boyd
@ 2019-11-16  5:55   ` syzbot
  0 siblings, 0 replies; 4+ messages in thread
From: syzbot @ 2019-11-16  5:55 UTC (permalink / raw)
  To: alexandre.belloni, andreyknvl, arnd, gregkh, herbert,
	linux-crypto, linux-kernel, linux-usb, lvivier, mchehab, mpm,
	swboyd, syzkaller-bugs, tytso

Hello,

syzbot has tested the proposed patch but the reproducer still triggered  
crash:
KASAN: use-after-free Read in chaoskey_disconnect

usb 5-1: USB disconnect, device number 2
==================================================================
BUG: KASAN: use-after-free in atomic_read  
include/asm-generic/atomic-instrumented.h:26 [inline]
BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x72/0x1e0  
lib/refcount.c:123
Read of size 4 at addr ffff8881d3106020 by task kworker/0:1/12

CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.4.0-rc5+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0xca/0x13e lib/dump_stack.c:113
  print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
  __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
  kasan_report+0xe/0x20 mm/kasan/common.c:634
  check_memory_region_inline mm/kasan/generic.c:185 [inline]
  check_memory_region+0x128/0x190 mm/kasan/generic.c:192
  atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
  refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123
  refcount_inc_checked+0x12/0x60 lib/refcount.c:156
  get_task_struct include/linux/sched/task.h:110 [inline]
  kthread_stop+0x6c/0x610 kernel/kthread.c:554
  hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538
  chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232
  usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
  __device_release_driver drivers/base/dd.c:1134 [inline]
  device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
  bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
  device_del+0x420/0xb20 drivers/base/core.c:2376
  usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
  usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200
  hub_port_connect drivers/usb/core/hub.c:5035 [inline]
  hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
  port_event drivers/usb/core/hub.c:5470 [inline]
  hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552
  process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
  process_scheduled_works kernel/workqueue.c:2331 [inline]
  worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
  kthread+0x318/0x420 kernel/kthread.c:255
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Allocated by task 2:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  __kasan_kmalloc mm/kasan/common.c:510 [inline]
  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
  slab_post_alloc_hook mm/slab.h:584 [inline]
  slab_alloc_node mm/slub.c:2779 [inline]
  kmem_cache_alloc_node+0xdc/0x310 mm/slub.c:2815
  alloc_task_struct_node kernel/fork.c:169 [inline]
  dup_task_struct kernel/fork.c:865 [inline]
  copy_process+0x4201/0x6470 kernel/fork.c:1851
  _do_fork+0x129/0xec0 kernel/fork.c:2366
  kernel_thread+0xaa/0xe0 kernel/fork.c:2453
  create_kthread kernel/kthread.c:278 [inline]
  kthreadd+0x4a2/0x680 kernel/kthread.c:596
  ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352

Freed by task 9:
  save_stack+0x1b/0x80 mm/kasan/common.c:69
  set_track mm/kasan/common.c:77 [inline]
  kasan_set_free_info mm/kasan/common.c:332 [inline]
  __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
  slab_free_hook mm/slub.c:1424 [inline]
  slab_free_freelist_hook mm/slub.c:1475 [inline]
  slab_free mm/slub.c:3025 [inline]
  kmem_cache_free+0xb9/0x380 mm/slub.c:3041
  __put_task_struct+0x1e2/0x4c0 kernel/fork.c:748
  put_task_struct include/linux/sched/task.h:119 [inline]
  delayed_put_task_struct+0x1b4/0x2c0 kernel/exit.c:182
  __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
  rcu_do_batch kernel/rcu/tree.c:2157 [inline]
  rcu_core+0x630/0x1ca0 kernel/rcu/tree.c:2377
  __do_softirq+0x221/0x912 kernel/softirq.c:292

The buggy address belongs to the object at ffff8881d3106000
  which belongs to the cache task_struct of size 5888
The buggy address is located 32 bytes inside of
  5888-byte region [ffff8881d3106000, ffff8881d3107700)
The buggy address belongs to the page:
page:ffffea00074c4000 refcount:1 mapcount:0 mapping:ffff8881da116000  
index:0xffff8881d3101800 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da116000
raw: ffff8881d3101800 0000000080050004 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff8881d3105f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
  ffff8881d3105f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> ffff8881d3106000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                ^
  ffff8881d3106080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff8881d3106100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


Tested on:

commit:         ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
git tree:       https://github.com/google/kasan.git
console output: https://syzkaller.appspot.com/x/log.txt?x=16dd8772e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
dashboard link: https://syzkaller.appspot.com/bug?extid=6d8505fcdf25f00ac276
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=14236abae00000


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: KASAN: use-after-free Read in chaoskey_disconnect
  2019-10-30 12:52 KASAN: use-after-free Read in chaoskey_disconnect syzbot
  2019-11-15 18:19 ` Stephen Boyd
@ 2020-06-18 12:12 ` Andrey Konovalov
  1 sibling, 0 replies; 4+ messages in thread
From: Andrey Konovalov @ 2020-06-18 12:12 UTC (permalink / raw)
  To: syzbot
  Cc: alexandre.belloni, Arnd Bergmann, Greg Kroah-Hartman, Herbert Xu,
	linux-crypto, LKML, USB list, lvivier, mchehab+samsung, mpm,
	swboyd, syzkaller-bugs, Theodore Ts'o

On Wed, Oct 30, 2019 at 1:52 PM syzbot
<syzbot+6d8505fcdf25f00ac276@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    ff6409a6 usb-fuzzer: main usb gadget fuzzer driver
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=15e1ba24e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3230c37d442895b7
> dashboard link: https://syzkaller.appspot.com/bug?extid=6d8505fcdf25f00ac276
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=169b8904e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=166f3104e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+6d8505fcdf25f00ac276@syzkaller.appspotmail.com
>
> usb 3-1: string descriptor 0 read error: -71
> usb 3-1: USB disconnect, device number 2
> ==================================================================
> BUG: KASAN: use-after-free in atomic_read
> include/asm-generic/atomic-instrumented.h:26 [inline]
> BUG: KASAN: use-after-free in refcount_inc_not_zero_checked+0x72/0x1e0
> lib/refcount.c:123
> Read of size 4 at addr ffff8881cf679820 by task kworker/1:1/1730
>
> CPU: 1 PID: 1730 Comm: kworker/1:1 Not tainted 5.4.0-rc5+ #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0xca/0x13e lib/dump_stack.c:113
>   print_address_description.constprop.0+0x36/0x50 mm/kasan/report.c:374
>   __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:506
>   kasan_report+0xe/0x20 mm/kasan/common.c:634
>   check_memory_region_inline mm/kasan/generic.c:185 [inline]
>   check_memory_region+0x128/0x190 mm/kasan/generic.c:192
>   atomic_read include/asm-generic/atomic-instrumented.h:26 [inline]
>   refcount_inc_not_zero_checked+0x72/0x1e0 lib/refcount.c:123
>   refcount_inc_checked+0x12/0x60 lib/refcount.c:156
>   get_task_struct include/linux/sched/task.h:110 [inline]
>   kthread_stop+0x6c/0x610 kernel/kthread.c:554
>   hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538
>   chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232
>   usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423
>   __device_release_driver drivers/base/dd.c:1134 [inline]
>   device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165
>   bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532
>   device_del+0x420/0xb20 drivers/base/core.c:2376
>   usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237
>   usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200
>   hub_port_connect drivers/usb/core/hub.c:5035 [inline]
>   hub_port_connect_change drivers/usb/core/hub.c:5324 [inline]
>   port_event drivers/usb/core/hub.c:5470 [inline]
>   hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552
>   process_one_work+0x92b/0x1530 kernel/workqueue.c:2269
>   process_scheduled_works kernel/workqueue.c:2331 [inline]
>   worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417
>   kthread+0x318/0x420 kernel/kthread.c:255
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Allocated by task 2:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   __kasan_kmalloc mm/kasan/common.c:510 [inline]
>   __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:483
>   slab_post_alloc_hook mm/slab.h:584 [inline]
>   slab_alloc_node mm/slub.c:2779 [inline]
>   kmem_cache_alloc_node+0xdc/0x310 mm/slub.c:2815
>   alloc_task_struct_node kernel/fork.c:169 [inline]
>   dup_task_struct kernel/fork.c:865 [inline]
>   copy_process+0x4201/0x6470 kernel/fork.c:1851
>   _do_fork+0x129/0xec0 kernel/fork.c:2366
>   kernel_thread+0xaa/0xe0 kernel/fork.c:2453
>   create_kthread kernel/kthread.c:278 [inline]
>   kthreadd+0x4a2/0x680 kernel/kthread.c:596
>   ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
>
> Freed by task 16:
>   save_stack+0x1b/0x80 mm/kasan/common.c:69
>   set_track mm/kasan/common.c:77 [inline]
>   kasan_set_free_info mm/kasan/common.c:332 [inline]
>   __kasan_slab_free+0x130/0x180 mm/kasan/common.c:471
>   slab_free_hook mm/slub.c:1424 [inline]
>   slab_free_freelist_hook mm/slub.c:1475 [inline]
>   slab_free mm/slub.c:3025 [inline]
>   kmem_cache_free+0xb9/0x380 mm/slub.c:3041
>   __put_task_struct+0x1e2/0x4c0 kernel/fork.c:748
>   put_task_struct include/linux/sched/task.h:119 [inline]
>   delayed_put_task_struct+0x1b4/0x2c0 kernel/exit.c:182
>   __rcu_reclaim kernel/rcu/rcu.h:222 [inline]
>   rcu_do_batch kernel/rcu/tree.c:2157 [inline]
>   rcu_core+0x630/0x1ca0 kernel/rcu/tree.c:2377
>   __do_softirq+0x221/0x912 kernel/softirq.c:292
>
> The buggy address belongs to the object at ffff8881cf679800
>   which belongs to the cache task_struct of size 5888
> The buggy address is located 32 bytes inside of
>   5888-byte region [ffff8881cf679800, ffff8881cf67af00)
> The buggy address belongs to the page:
> page:ffffea00073d9e00 refcount:1 mapcount:0 mapping:ffff8881da116000
> index:0x0 compound_mapcount: 0
> flags: 0x200000000010200(slab|head)
> raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da116000
> raw: 0000000000000000 0000000080050005 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>   ffff8881cf679700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>   ffff8881cf679780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
> > ffff8881cf679800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                                 ^
>   ffff8881cf679880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff8881cf679900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ==================================================================
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches

#syz fix: USB: chaoskey: fix use-after-free on release

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2020-06-18 12:12 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-10-30 12:52 KASAN: use-after-free Read in chaoskey_disconnect syzbot
2019-11-15 18:19 ` Stephen Boyd
2019-11-16  5:55   ` syzbot
2020-06-18 12:12 ` Andrey Konovalov

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