Netdev Archive on lore.kernel.org
 help / color / Atom feed
* KASAN: use-after-free Write in ath9k_htc_rx_msg
@ 2020-03-26 11:34 syzbot
  2020-03-31 16:36 ` Qiujun Huang
  2020-04-03  1:49 ` Qiujun Huang
  0 siblings, 2 replies; 5+ messages in thread
From: syzbot @ 2020-03-26 11:34 UTC (permalink / raw)
  To: andreyknvl, ath9k-devel, davem, kvalo, linux-kernel, linux-usb,
	linux-wireless, netdev, syzkaller-bugs

Hello,

syzbot found the following crash on:

HEAD commit:    e17994d1 usb: core: kcov: collect coverage from usb comple..
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=13a40c13e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
dashboard link: https://syzkaller.appspot.com/bug?extid=b1c61e5f11be5782f192
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13790f73e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14ebae75e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b1c61e5f11be5782f192@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
BUG: KASAN: use-after-free in ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:443
Write of size 2 at addr ffff8881cea291f0 by task swapper/1/0

CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc5-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+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
 ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:443
 ath9k_hif_usb_reg_in_cb+0x1ba/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:718
 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716
 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966
 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
 __do_softirq+0x21e/0x950 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696
Code: cc cc 41 56 41 55 65 44 8b 2d 44 77 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 62 b5 fb e9 07 00 00 00 0f 00 2d ea 0c 53 00 fb f4 <65> 44 8b 2d 20 77 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffff8881da22fda8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffff8881da213100 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881da21394c
RBP: ffffed103b442620 R08: ffff8881da213100 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000001 R14: ffffffff87e607c0 R15: 0000000000000000
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x3e0/0x500 kernel/sched/idle.c:269
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361
 start_secondary+0x2a4/0x390 arch/x86/kernel/smpboot.c:264
 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242

Allocated by task 371:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488
 kmalloc include/linux/slab.h:560 [inline]
 raw_alloc_io_data drivers/usb/gadget/legacy/raw_gadget.c:556 [inline]
 raw_alloc_io_data+0x150/0x1c0 drivers/usb/gadget/legacy/raw_gadget.c:538
 raw_ioctl_ep0_read drivers/usb/gadget/legacy/raw_gadget.c:657 [inline]
 raw_ioctl+0x686/0x1a70 drivers/usb/gadget/legacy/raw_gadget.c:1035
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 371:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x117/0x160 mm/kasan/common.c:476
 slab_free_hook mm/slub.c:1444 [inline]
 slab_free_freelist_hook mm/slub.c:1477 [inline]
 slab_free mm/slub.c:3024 [inline]
 kfree+0xd5/0x300 mm/slub.c:3976
 raw_ioctl_ep_read drivers/usb/gadget/legacy/raw_gadget.c:961 [inline]
 raw_ioctl+0x189/0x1a70 drivers/usb/gadget/legacy/raw_gadget.c:1047
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881cea29000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 496 bytes inside of
 2048-byte region [ffff8881cea29000, ffff8881cea29800)
The buggy address belongs to the page:
page:ffffea00073a8a00 refcount:1 mapcount:0 mapping:ffff8881da00c000 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c000
raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881cea29080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881cea29100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881cea29180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                             ^
 ffff8881cea29200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881cea29280: 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] 5+ messages in thread

* Re: KASAN: use-after-free Write in ath9k_htc_rx_msg
  2020-03-26 11:34 KASAN: use-after-free Write in ath9k_htc_rx_msg syzbot
@ 2020-03-31 16:36 ` Qiujun Huang
  2020-03-31 16:50   ` syzbot
  2020-04-03  1:49 ` Qiujun Huang
  1 sibling, 1 reply; 5+ messages in thread
From: Qiujun Huang @ 2020-03-31 16:36 UTC (permalink / raw)
  To: syzbot
  Cc: Andrey Konovalov, ath9k-devel, davem, kvalo, LKML, USB list,
	linux-wireless, netdev, syzkaller-bugs

[-- Attachment #1: Type: text/plain, Size: 7002 bytes --]

#syz test: https://github.com/google/kasan.git usb-fuzzer

On Thu, Mar 26, 2020 at 7:35 PM syzbot
<syzbot+b1c61e5f11be5782f192@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    e17994d1 usb: core: kcov: collect coverage from usb comple..
> git tree:       https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=13a40c13e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
> dashboard link: https://syzkaller.appspot.com/bug?extid=b1c61e5f11be5782f192
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13790f73e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14ebae75e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+b1c61e5f11be5782f192@syzkaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: use-after-free in htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
> BUG: KASAN: use-after-free in ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:443
> Write of size 2 at addr ffff8881cea291f0 by task swapper/1/0
>
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc5-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+0xef/0x16e lib/dump_stack.c:118
>  print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
>  __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506
>  kasan_report+0xe/0x20 mm/kasan/common.c:641
>  htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
>  ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:443
>  ath9k_hif_usb_reg_in_cb+0x1ba/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:718
>  __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650
>  usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716
>  dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966
>  call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
>  expire_timers kernel/time/timer.c:1449 [inline]
>  __run_timers kernel/time/timer.c:1773 [inline]
>  __run_timers kernel/time/timer.c:1740 [inline]
>  run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
>  __do_softirq+0x21e/0x950 kernel/softirq.c:292
>  invoke_softirq kernel/softirq.c:373 [inline]
>  irq_exit+0x178/0x1a0 kernel/softirq.c:413
>  exiting_irq arch/x86/include/asm/apic.h:546 [inline]
>  smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146
>  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
>  </IRQ>
> RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696
> Code: cc cc 41 56 41 55 65 44 8b 2d 44 77 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 62 b5 fb e9 07 00 00 00 0f 00 2d ea 0c 53 00 fb f4 <65> 44 8b 2d 20 77 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
> RSP: 0018:ffff8881da22fda8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
> RAX: 0000000000000007 RBX: ffff8881da213100 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881da21394c
> RBP: ffffed103b442620 R08: ffff8881da213100 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
> R13: 0000000000000001 R14: ffffffff87e607c0 R15: 0000000000000000
>  cpuidle_idle_call kernel/sched/idle.c:154 [inline]
>  do_idle+0x3e0/0x500 kernel/sched/idle.c:269
>  cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361
>  start_secondary+0x2a4/0x390 arch/x86/kernel/smpboot.c:264
>  secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242
>
> Allocated by task 371:
>  save_stack+0x1b/0x80 mm/kasan/common.c:72
>  set_track mm/kasan/common.c:80 [inline]
>  __kasan_kmalloc mm/kasan/common.c:515 [inline]
>  __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488
>  kmalloc include/linux/slab.h:560 [inline]
>  raw_alloc_io_data drivers/usb/gadget/legacy/raw_gadget.c:556 [inline]
>  raw_alloc_io_data+0x150/0x1c0 drivers/usb/gadget/legacy/raw_gadget.c:538
>  raw_ioctl_ep0_read drivers/usb/gadget/legacy/raw_gadget.c:657 [inline]
>  raw_ioctl+0x686/0x1a70 drivers/usb/gadget/legacy/raw_gadget.c:1035
>  vfs_ioctl fs/ioctl.c:47 [inline]
>  ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
>  __do_sys_ioctl fs/ioctl.c:772 [inline]
>  __se_sys_ioctl fs/ioctl.c:770 [inline]
>  __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
>  do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> Freed by task 371:
>  save_stack+0x1b/0x80 mm/kasan/common.c:72
>  set_track mm/kasan/common.c:80 [inline]
>  kasan_set_free_info mm/kasan/common.c:337 [inline]
>  __kasan_slab_free+0x117/0x160 mm/kasan/common.c:476
>  slab_free_hook mm/slub.c:1444 [inline]
>  slab_free_freelist_hook mm/slub.c:1477 [inline]
>  slab_free mm/slub.c:3024 [inline]
>  kfree+0xd5/0x300 mm/slub.c:3976
>  raw_ioctl_ep_read drivers/usb/gadget/legacy/raw_gadget.c:961 [inline]
>  raw_ioctl+0x189/0x1a70 drivers/usb/gadget/legacy/raw_gadget.c:1047
>  vfs_ioctl fs/ioctl.c:47 [inline]
>  ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
>  __do_sys_ioctl fs/ioctl.c:772 [inline]
>  __se_sys_ioctl fs/ioctl.c:770 [inline]
>  __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
>  do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> The buggy address belongs to the object at ffff8881cea29000
>  which belongs to the cache kmalloc-2k of size 2048
> The buggy address is located 496 bytes inside of
>  2048-byte region [ffff8881cea29000, ffff8881cea29800)
> The buggy address belongs to the page:
> page:ffffea00073a8a00 refcount:1 mapcount:0 mapping:ffff8881da00c000 index:0x0 compound_mapcount: 0
> flags: 0x200000000010200(slab|head)
> raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da00c000
> raw: 0000000000000000 0000000080080008 00000001ffffffff 0000000000000000
> page dumped because: kasan: bad access detected
>
> Memory state around the buggy address:
>  ffff8881cea29080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>  ffff8881cea29100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >ffff8881cea29180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                                                              ^
>  ffff8881cea29200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>  ffff8881cea29280: 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

[-- Attachment #2: 0001-ath9k-fix-use-after-free-read-in-htc_connect_service.patch --]
[-- Type: application/octet-stream, Size: 3778 bytes --]

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: KASAN: use-after-free Write in ath9k_htc_rx_msg
  2020-03-31 16:36 ` Qiujun Huang
@ 2020-03-31 16:50   ` syzbot
  0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2020-03-31 16:50 UTC (permalink / raw)
  To: andreyknvl, anenbupt, ath9k-devel, davem, kvalo, linux-kernel,
	linux-usb, linux-wireless, netdev, syzkaller-bugs

Hello,

syzbot has tested the proposed patch but the reproducer still triggered crash:
KASAN: use-after-free Write in ath9k_htc_rx_msg

==================================================================
BUG: KASAN: use-after-free in htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
BUG: KASAN: use-after-free in ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:442
Write of size 2 at addr ffff8881d46881b0 by task swapper/0/0

CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc7-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+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 htc_process_conn_rsp drivers/net/wireless/ath/ath9k/htc_hst.c:131 [inline]
 ath9k_htc_rx_msg+0xa25/0xaf0 drivers/net/wireless/ath/ath9k/htc_hst.c:442
 ath9k_hif_usb_reg_in_cb+0x1ba/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:718
 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1648
 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1713
 dummy_timer+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966
 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786
 __do_softirq+0x21e/0x950 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x178/0x1a0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:546 [inline]
 smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1146
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696
Code: cc cc 41 56 41 55 65 44 8b 2d 04 3b 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 27 b5 fb e9 07 00 00 00 0f 00 2d aa d0 52 00 fb f4 <65> 44 8b 2d e0 3a 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3
RSP: 0018:ffffffff87007d80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000007 RBX: ffffffff8702cc40 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702d48c
RBP: fffffbfff0e05988 R08: ffffffff8702cc40 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff87e612c0 R15: 0000000000000000
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x3e0/0x500 kernel/sched/idle.c:269
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361
 start_kernel+0xe16/0xe5a init/main.c:998
 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242

Allocated by task 2593:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 __kasan_kmalloc mm/kasan/common.c:515 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:488
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2786 [inline]
 slab_alloc mm/slub.c:2794 [inline]
 kmem_cache_alloc+0xd8/0x300 mm/slub.c:2799
 getname_flags fs/namei.c:138 [inline]
 getname_flags+0xd2/0x5b0 fs/namei.c:128
 do_sys_openat2+0x3cf/0x740 fs/open.c:1140
 do_sys_open+0xc3/0x140 fs/open.c:1162
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 2593:
 save_stack+0x1b/0x80 mm/kasan/common.c:72
 set_track mm/kasan/common.c:80 [inline]
 kasan_set_free_info mm/kasan/common.c:337 [inline]
 __kasan_slab_free+0x117/0x160 mm/kasan/common.c:476
 slab_free_hook mm/slub.c:1444 [inline]
 slab_free_freelist_hook mm/slub.c:1477 [inline]
 slab_free mm/slub.c:3034 [inline]
 kmem_cache_free+0x9b/0x360 mm/slub.c:3050
 putname+0xe1/0x120 fs/namei.c:259
 do_sys_openat2+0x43a/0x740 fs/open.c:1155
 do_sys_open+0xc3/0x140 fs/open.c:1162
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881d4688000
 which belongs to the cache names_cache of size 4096
The buggy address is located 432 bytes inside of
 4096-byte region [ffff8881d4688000, ffff8881d4689000)
The buggy address belongs to the page:
page:ffffea000751a200 refcount:1 mapcount:0 mapping:ffff8881da11c000 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da11c000
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881d4688080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d4688100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881d4688180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                     ^
 ffff8881d4688200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d4688280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


Tested on:

commit:         0fa84af8 Merge tag 'usb-serial-5.7-rc1' of https://git.ker..
git tree:       https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=14d6096de00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a782c087b1f425c6
dashboard link: https://syzkaller.appspot.com/bug?extid=b1c61e5f11be5782f192
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1782b063e00000


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: KASAN: use-after-free Write in ath9k_htc_rx_msg
  2020-03-26 11:34 KASAN: use-after-free Write in ath9k_htc_rx_msg syzbot
  2020-03-31 16:36 ` Qiujun Huang
@ 2020-04-03  1:49 ` Qiujun Huang
  2020-04-03  2:07   ` syzbot
  1 sibling, 1 reply; 5+ messages in thread
From: Qiujun Huang @ 2020-04-03  1:49 UTC (permalink / raw)
  To: syzbot
  Cc: Andrey Konovalov, ath9k-devel, davem, kvalo, LKML, USB list,
	linux-wireless, netdev, syzkaller-bugs

[-- Attachment #1: Type: text/plain, Size: 58 bytes --]

#syz test: https://github.com/google/kasan.git usb-fuzzer

[-- Attachment #2: 0001-ath9k-fix-use-after-free-read-in-htc_connect_service.patch --]
[-- Type: application/octet-stream, Size: 4880 bytes --]

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: KASAN: use-after-free Write in ath9k_htc_rx_msg
  2020-04-03  1:49 ` Qiujun Huang
@ 2020-04-03  2:07   ` syzbot
  0 siblings, 0 replies; 5+ messages in thread
From: syzbot @ 2020-04-03  2:07 UTC (permalink / raw)
  To: andreyknvl, anenbupt, ath9k-devel, davem, kvalo, linux-kernel,
	linux-usb, linux-wireless, netdev, syzkaller-bugs

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger crash:

Reported-and-tested-by: syzbot+b1c61e5f11be5782f192@syzkaller.appspotmail.com

Tested on:

commit:         0fa84af8 Merge tag 'usb-serial-5.7-rc1' of https://git.ker..
git tree:       https://github.com/google/kasan.git usb-fuzzer
kernel config:  https://syzkaller.appspot.com/x/.config?x=a782c087b1f425c6
dashboard link: https://syzkaller.appspot.com/bug?extid=b1c61e5f11be5782f192
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
patch:          https://syzkaller.appspot.com/x/patch.diff?x=172383dbe00000

Note: testing is done by a robot and is best-effort only.

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, back to index

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-03-26 11:34 KASAN: use-after-free Write in ath9k_htc_rx_msg syzbot
2020-03-31 16:36 ` Qiujun Huang
2020-03-31 16:50   ` syzbot
2020-04-03  1:49 ` Qiujun Huang
2020-04-03  2:07   ` syzbot

Netdev Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/netdev/0 netdev/git/0.git
	git clone --mirror https://lore.kernel.org/netdev/1 netdev/git/1.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 netdev netdev/ https://lore.kernel.org/netdev \
		netdev@vger.kernel.org
	public-inbox-index netdev

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.netdev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git