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: [email protected]
==================================================================
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 [email protected].
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
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: [email protected]
>
> ==================================================================
> 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 [email protected].
>
> 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
On Mon, Dec 2, 2019 at 10:28 PM Oliver Hartkopp <[email protected]> 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: [email protected]
> >
> > ==================================================================
> > 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 [email protected].
> >
> > 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
>
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This bug is marked as fixed by commit:
slcan: Fix use-after-free Read in slcan_open
But I can't find it in any tested tree for more than 90 days.
Is it a correct commit? Please update it by replying:
#syz fix: exact-commit-title
Until then the bug is still considered open and
new crashes with the same signature are ignored.
#sys fix: can: slcan: Fix use-after-free Read in slcan_open
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/can/slcan.c?id=9ebd796e24008f33f06ebea5a5e6aceb68b51794
Thanks,
Oliver
On 02/03/2020 07.30, syzbot wrote:
> This bug is marked as fixed by commit:
> slcan: Fix use-after-free Read in slcan_open
> But I can't find it in any tested tree for more than 90 days.
> Is it a correct commit? Please update it by replying:
> #syz fix: exact-commit-title
> Until then the bug is still considered open and
> new crashes with the same signature are ignored.
>