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* KASAN: use-after-free Read in slcan_open
@ 2019-12-02 17:05 syzbot
  2019-12-02 21:28 ` Oliver Hartkopp
  0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2019-12-02 17:05 UTC (permalink / raw)
  To: davem, linux-can, linux-kernel, mkl, netdev, syzkaller-bugs, wg

Hello,

syzbot found the following crash on:

HEAD commit:    32ef9553 Merge tag 'fsnotify_for_v5.5-rc1' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=12a48e9ce00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ff560c3de405258c
dashboard link: https://syzkaller.appspot.com/bug?extid=b5ec6fd05ab552a78532
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12943882e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10562f86e00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+b5ec6fd05ab552a78532@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: use-after-free in slc_sync drivers/net/can/slcan.c:504 [inline]
BUG: KASAN: use-after-free in slcan_open+0x8a1/0x9e0  
drivers/net/can/slcan.c:579
Read of size 8 at addr ffff88809a6e0b88 by task syz-executor961/9030

CPU: 1 PID: 9030 Comm: syz-executor961 Not tainted 5.4.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x197/0x210 lib/dump_stack.c:118
  print_address_description.constprop.0.cold+0xd4/0x30b mm/kasan/report.c:374
  __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
  kasan_report+0x12/0x20 mm/kasan/common.c:634
  __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
  slc_sync drivers/net/can/slcan.c:504 [inline]
  slcan_open+0x8a1/0x9e0 drivers/net/can/slcan.c:579
  tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
  tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
  tiocsetd drivers/tty/tty_io.c:2334 [inline]
  tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4429e9
Code: e8 dc 02 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7  
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff  
ff 0f 83 1b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffc7db87168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004429e9
RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000003031
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000004 R14: 00007ffc7db871dc R15: 0000000000000000

Allocated by task 9029:
  save_stack+0x23/0x90 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+0xcf/0xe0 mm/kasan/common.c:483
  kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
  __do_kmalloc_node mm/slab.c:3615 [inline]
  __kmalloc_node+0x4e/0x70 mm/slab.c:3622
  kmalloc_node include/linux/slab.h:599 [inline]
  kvmalloc_node+0xbd/0x100 mm/util.c:564
  kvmalloc include/linux/mm.h:670 [inline]
  kvzalloc include/linux/mm.h:678 [inline]
  alloc_netdev_mqs+0x98/0xde0 net/core/dev.c:9730
  slc_alloc drivers/net/can/slcan.c:533 [inline]
  slcan_open+0x32d/0x9e0 drivers/net/can/slcan.c:590
  tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
  tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
  tiocsetd drivers/tty/tty_io.c:2334 [inline]
  tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 9029:
  save_stack+0x23/0x90 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+0x102/0x150 mm/kasan/common.c:471
  kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
  __cache_free mm/slab.c:3425 [inline]
  kfree+0x10a/0x2c0 mm/slab.c:3756
  kvfree+0x61/0x70 mm/util.c:593
  netdev_freemem net/core/dev.c:9684 [inline]
  free_netdev+0x3c0/0x470 net/core/dev.c:9839
  slcan_open+0x848/0x9e0 drivers/net/can/slcan.c:620
  tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
  tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
  tiocsetd drivers/tty/tty_io.c:2334 [inline]
  tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
  vfs_ioctl fs/ioctl.c:46 [inline]
  file_ioctl fs/ioctl.c:509 [inline]
  do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
  ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
  __do_sys_ioctl fs/ioctl.c:720 [inline]
  __se_sys_ioctl fs/ioctl.c:718 [inline]
  __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
  do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
  entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88809a6e0000
  which belongs to the cache kmalloc-32k of size 32768
The buggy address is located 2952 bytes inside of
  32768-byte region [ffff88809a6e0000, ffff88809a6e8000)
The buggy address belongs to the page:
page:ffffea000269b800 refcount:1 mapcount:0 mapping:ffff8880aa402540  
index:0x0 compound_mapcount: 0
raw: 00fffe0000010200 ffffea000244d008 ffff8880aa401d48 ffff8880aa402540
raw: 0000000000000000 ffff88809a6e0000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
  ffff88809a6e0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809a6e0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff88809a6e0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                       ^
  ffff88809a6e0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
  ffff88809a6e0c80: 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] 3+ messages in thread

* Re: KASAN: use-after-free Read in slcan_open
  2019-12-02 17:05 KASAN: use-after-free Read in slcan_open syzbot
@ 2019-12-02 21:28 ` Oliver Hartkopp
  2019-12-03  6:29   ` Dmitry Vyukov
  0 siblings, 1 reply; 3+ messages in thread
From: Oliver Hartkopp @ 2019-12-02 21:28 UTC (permalink / raw)
  To: syzbot, davem, linux-can, linux-kernel, mkl, netdev,
	syzkaller-bugs, wg, Jouni Hogander

This issue has already been addressed by Jouni Hogander here:

https://marc.info/?l=linux-can&m=157483684128186

The patch is waiting for upstream via linux-can tree.

Regards,
Oliver

On 02/12/2019 18.05, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    32ef9553 Merge tag 'fsnotify_for_v5.5-rc1' of 
> git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12a48e9ce00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ff560c3de405258c
> dashboard link: 
> https://syzkaller.appspot.com/bug?extid=b5ec6fd05ab552a78532
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12943882e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10562f86e00000
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+b5ec6fd05ab552a78532@syzkaller.appspotmail.com
> 
> ==================================================================
> BUG: KASAN: use-after-free in slc_sync drivers/net/can/slcan.c:504 [inline]
> BUG: KASAN: use-after-free in slcan_open+0x8a1/0x9e0 
> drivers/net/can/slcan.c:579
> Read of size 8 at addr ffff88809a6e0b88 by task syz-executor961/9030
> 
> CPU: 1 PID: 9030 Comm: syz-executor961 Not tainted 5.4.0-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS 
> Google 01/01/2011
> Call Trace:
>   __dump_stack lib/dump_stack.c:77 [inline]
>   dump_stack+0x197/0x210 lib/dump_stack.c:118
>   print_address_description.constprop.0.cold+0xd4/0x30b 
> mm/kasan/report.c:374
>   __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
>   kasan_report+0x12/0x20 mm/kasan/common.c:634
>   __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
>   slc_sync drivers/net/can/slcan.c:504 [inline]
>   slcan_open+0x8a1/0x9e0 drivers/net/can/slcan.c:579
>   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
>   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
>   tiocsetd drivers/tty/tty_io.c:2334 [inline]
>   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
>   vfs_ioctl fs/ioctl.c:46 [inline]
>   file_ioctl fs/ioctl.c:509 [inline]
>   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
>   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
>   __do_sys_ioctl fs/ioctl.c:720 [inline]
>   __se_sys_ioctl fs/ioctl.c:718 [inline]
>   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
>   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x4429e9
> Code: e8 dc 02 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 
> f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 
> f0 ff ff 0f 83 1b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffc7db87168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004429e9
> RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003
> RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000003031
> R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
> R13: 0000000000000004 R14: 00007ffc7db871dc R15: 0000000000000000
> 
> Allocated by task 9029:
>   save_stack+0x23/0x90 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+0xcf/0xe0 mm/kasan/common.c:483
>   kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
>   __do_kmalloc_node mm/slab.c:3615 [inline]
>   __kmalloc_node+0x4e/0x70 mm/slab.c:3622
>   kmalloc_node include/linux/slab.h:599 [inline]
>   kvmalloc_node+0xbd/0x100 mm/util.c:564
>   kvmalloc include/linux/mm.h:670 [inline]
>   kvzalloc include/linux/mm.h:678 [inline]
>   alloc_netdev_mqs+0x98/0xde0 net/core/dev.c:9730
>   slc_alloc drivers/net/can/slcan.c:533 [inline]
>   slcan_open+0x32d/0x9e0 drivers/net/can/slcan.c:590
>   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
>   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
>   tiocsetd drivers/tty/tty_io.c:2334 [inline]
>   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
>   vfs_ioctl fs/ioctl.c:46 [inline]
>   file_ioctl fs/ioctl.c:509 [inline]
>   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
>   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
>   __do_sys_ioctl fs/ioctl.c:720 [inline]
>   __se_sys_ioctl fs/ioctl.c:718 [inline]
>   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
>   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> Freed by task 9029:
>   save_stack+0x23/0x90 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+0x102/0x150 mm/kasan/common.c:471
>   kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
>   __cache_free mm/slab.c:3425 [inline]
>   kfree+0x10a/0x2c0 mm/slab.c:3756
>   kvfree+0x61/0x70 mm/util.c:593
>   netdev_freemem net/core/dev.c:9684 [inline]
>   free_netdev+0x3c0/0x470 net/core/dev.c:9839
>   slcan_open+0x848/0x9e0 drivers/net/can/slcan.c:620
>   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
>   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
>   tiocsetd drivers/tty/tty_io.c:2334 [inline]
>   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
>   vfs_ioctl fs/ioctl.c:46 [inline]
>   file_ioctl fs/ioctl.c:509 [inline]
>   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
>   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
>   __do_sys_ioctl fs/ioctl.c:720 [inline]
>   __se_sys_ioctl fs/ioctl.c:718 [inline]
>   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
>   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
>   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> 
> The buggy address belongs to the object at ffff88809a6e0000
>   which belongs to the cache kmalloc-32k of size 32768
> The buggy address is located 2952 bytes inside of
>   32768-byte region [ffff88809a6e0000, ffff88809a6e8000)
> The buggy address belongs to the page:
> page:ffffea000269b800 refcount:1 mapcount:0 mapping:ffff8880aa402540 
> index:0x0 compound_mapcount: 0
> raw: 00fffe0000010200 ffffea000244d008 ffff8880aa401d48 ffff8880aa402540
> raw: 0000000000000000 ffff88809a6e0000 0000000100000001 0000000000000000
> page dumped because: kasan: bad access detected
> 
> Memory state around the buggy address:
>   ffff88809a6e0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff88809a6e0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>> ffff88809a6e0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>                        ^
>   ffff88809a6e0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>   ffff88809a6e0c80: 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] 3+ messages in thread

* Re: KASAN: use-after-free Read in slcan_open
  2019-12-02 21:28 ` Oliver Hartkopp
@ 2019-12-03  6:29   ` Dmitry Vyukov
  0 siblings, 0 replies; 3+ messages in thread
From: Dmitry Vyukov @ 2019-12-03  6:29 UTC (permalink / raw)
  To: Oliver Hartkopp
  Cc: syzbot, David Miller, linux-can, LKML, Marc Kleine-Budde, netdev,
	syzkaller-bugs, wg, Jouni Hogander

On Mon, Dec 2, 2019 at 10:28 PM Oliver Hartkopp <socketcan@hartkopp.net> wrote:
>
> This issue has already been addressed by Jouni Hogander here:
>
> https://marc.info/?l=linux-can&m=157483684128186
>
> The patch is waiting for upstream via linux-can tree.

#syz fix: slcan: Fix use-after-free Read in slcan_open

> Regards,
> Oliver
>
> On 02/12/2019 18.05, syzbot wrote:
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit:    32ef9553 Merge tag 'fsnotify_for_v5.5-rc1' of
> > git://git.ke..
> > git tree:       upstream
> > console output: https://syzkaller.appspot.com/x/log.txt?x=12a48e9ce00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=ff560c3de405258c
> > dashboard link:
> > https://syzkaller.appspot.com/bug?extid=b5ec6fd05ab552a78532
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12943882e00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10562f86e00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+b5ec6fd05ab552a78532@syzkaller.appspotmail.com
> >
> > ==================================================================
> > BUG: KASAN: use-after-free in slc_sync drivers/net/can/slcan.c:504 [inline]
> > BUG: KASAN: use-after-free in slcan_open+0x8a1/0x9e0
> > drivers/net/can/slcan.c:579
> > Read of size 8 at addr ffff88809a6e0b88 by task syz-executor961/9030
> >
> > CPU: 1 PID: 9030 Comm: syz-executor961 Not tainted 5.4.0-syzkaller #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Call Trace:
> >   __dump_stack lib/dump_stack.c:77 [inline]
> >   dump_stack+0x197/0x210 lib/dump_stack.c:118
> >   print_address_description.constprop.0.cold+0xd4/0x30b
> > mm/kasan/report.c:374
> >   __kasan_report.cold+0x1b/0x41 mm/kasan/report.c:506
> >   kasan_report+0x12/0x20 mm/kasan/common.c:634
> >   __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132
> >   slc_sync drivers/net/can/slcan.c:504 [inline]
> >   slcan_open+0x8a1/0x9e0 drivers/net/can/slcan.c:579
> >   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
> >   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
> >   tiocsetd drivers/tty/tty_io.c:2334 [inline]
> >   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
> >   vfs_ioctl fs/ioctl.c:46 [inline]
> >   file_ioctl fs/ioctl.c:509 [inline]
> >   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
> >   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
> >   __do_sys_ioctl fs/ioctl.c:720 [inline]
> >   __se_sys_ioctl fs/ioctl.c:718 [inline]
> >   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
> >   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
> >   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> > RIP: 0033:0x4429e9
> > Code: e8 dc 02 03 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89
> > f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01
> > f0 ff ff 0f 83 1b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
> > RSP: 002b:00007ffc7db87168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004429e9
> > RDX: 00000000200000c0 RSI: 0000000000005423 RDI: 0000000000000003
> > RBP: 0000000000000000 R08: 0000000000000002 R09: 0000000000003031
> > R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
> > R13: 0000000000000004 R14: 00007ffc7db871dc R15: 0000000000000000
> >
> > Allocated by task 9029:
> >   save_stack+0x23/0x90 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+0xcf/0xe0 mm/kasan/common.c:483
> >   kasan_kmalloc+0x9/0x10 mm/kasan/common.c:524
> >   __do_kmalloc_node mm/slab.c:3615 [inline]
> >   __kmalloc_node+0x4e/0x70 mm/slab.c:3622
> >   kmalloc_node include/linux/slab.h:599 [inline]
> >   kvmalloc_node+0xbd/0x100 mm/util.c:564
> >   kvmalloc include/linux/mm.h:670 [inline]
> >   kvzalloc include/linux/mm.h:678 [inline]
> >   alloc_netdev_mqs+0x98/0xde0 net/core/dev.c:9730
> >   slc_alloc drivers/net/can/slcan.c:533 [inline]
> >   slcan_open+0x32d/0x9e0 drivers/net/can/slcan.c:590
> >   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
> >   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
> >   tiocsetd drivers/tty/tty_io.c:2334 [inline]
> >   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
> >   vfs_ioctl fs/ioctl.c:46 [inline]
> >   file_ioctl fs/ioctl.c:509 [inline]
> >   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
> >   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
> >   __do_sys_ioctl fs/ioctl.c:720 [inline]
> >   __se_sys_ioctl fs/ioctl.c:718 [inline]
> >   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
> >   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
> >   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> >
> > Freed by task 9029:
> >   save_stack+0x23/0x90 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+0x102/0x150 mm/kasan/common.c:471
> >   kasan_slab_free+0xe/0x10 mm/kasan/common.c:480
> >   __cache_free mm/slab.c:3425 [inline]
> >   kfree+0x10a/0x2c0 mm/slab.c:3756
> >   kvfree+0x61/0x70 mm/util.c:593
> >   netdev_freemem net/core/dev.c:9684 [inline]
> >   free_netdev+0x3c0/0x470 net/core/dev.c:9839
> >   slcan_open+0x848/0x9e0 drivers/net/can/slcan.c:620
> >   tty_ldisc_open.isra.0+0xa3/0x110 drivers/tty/tty_ldisc.c:469
> >   tty_set_ldisc+0x30e/0x6b0 drivers/tty/tty_ldisc.c:596
> >   tiocsetd drivers/tty/tty_io.c:2334 [inline]
> >   tty_ioctl+0xe8d/0x14f0 drivers/tty/tty_io.c:2594
> >   vfs_ioctl fs/ioctl.c:46 [inline]
> >   file_ioctl fs/ioctl.c:509 [inline]
> >   do_vfs_ioctl+0xdb6/0x13e0 fs/ioctl.c:696
> >   ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
> >   __do_sys_ioctl fs/ioctl.c:720 [inline]
> >   __se_sys_ioctl fs/ioctl.c:718 [inline]
> >   __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
> >   do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
> >   entry_SYSCALL_64_after_hwframe+0x49/0xbe
> >
> > The buggy address belongs to the object at ffff88809a6e0000
> >   which belongs to the cache kmalloc-32k of size 32768
> > The buggy address is located 2952 bytes inside of
> >   32768-byte region [ffff88809a6e0000, ffff88809a6e8000)
> > The buggy address belongs to the page:
> > page:ffffea000269b800 refcount:1 mapcount:0 mapping:ffff8880aa402540
> > index:0x0 compound_mapcount: 0
> > raw: 00fffe0000010200 ffffea000244d008 ffff8880aa401d48 ffff8880aa402540
> > raw: 0000000000000000 ffff88809a6e0000 0000000100000001 0000000000000000
> > page dumped because: kasan: bad access detected
> >
> > Memory state around the buggy address:
> >   ffff88809a6e0a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff88809a6e0b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >> ffff88809a6e0b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >                        ^
> >   ffff88809a6e0c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> >   ffff88809a6e0c80: 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
>
> --
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/09ad00de-c082-3c69-5b81-ceae5e9cd3c9%40hartkopp.net.

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Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-12-02 17:05 KASAN: use-after-free Read in slcan_open syzbot
2019-12-02 21:28 ` Oliver Hartkopp
2019-12-03  6:29   ` Dmitry Vyukov

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