KASAN: slab-out-of-bounds Read in tun_net_xmit
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syzbot
Oct 19, 2017, 1:54:04 AM10/19/17
to syzkaller-upst...@googlegroups.com
Hello,
syzkaller hit the following crash on
fb686cb13e51f4c342c84549dbe8a13bd0eddf36
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
CC: [ak...@linux-foundation.org alexande...@amd.com
ch...@chris-wilson.co.uk da...@davemloft.net fg...@ikuai8.com
gre...@linuxfoundation.org ja...@ovn.org ja...@redhat.com
jaso...@redhat.com linux-...@vger.kernel.org net...@vger.kernel.org
ste...@networkplumber.org tg...@linutronix.de tre...@gmail.com]
==================================================================
BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce
include/linux/ptr_ring.h:107 [inline]
BUG: KASAN: slab-out-of-bounds in ptr_ring_produce
include/linux/ptr_ring.h:126 [inline]
BUG: KASAN: slab-out-of-bounds in skb_array_produce
include/linux/skb_array.h:48 [inline]
BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x120a/0x1280
drivers/net/tun.c:994
Read of size 8 at addr ffff8801c29adba0 by task syz-executor5/4054
CPU: 0 PID: 4054 Comm: syz-executor5 Not tainted 4.14.0-rc3-mm1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
__ptr_ring_produce include/linux/ptr_ring.h:107 [inline]
ptr_ring_produce include/linux/ptr_ring.h:126 [inline]
skb_array_produce include/linux/skb_array.h:48 [inline]
tun_net_xmit+0x120a/0x1280 drivers/net/tun.c:994
__netdev_start_xmit include/linux/netdevice.h:4000 [inline]
netdev_start_xmit include/linux/netdevice.h:4009 [inline]
xmit_one net/core/dev.c:2979 [inline]
dev_hard_start_xmit+0x248/0xac0 net/core/dev.c:2995
sch_direct_xmit+0x31d/0x6d0 net/sched/sch_generic.c:186
__dev_xmit_skb net/core/dev.c:3177 [inline]
__dev_queue_xmit+0x16c6/0x2050 net/core/dev.c:3444
dev_queue_xmit+0x17/0x20 net/core/dev.c:3509
neigh_hh_output include/net/neighbour.h:471 [inline]
neigh_output include/net/neighbour.h:479 [inline]
ip6_finish_output2+0x13c4/0x22a0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
NF_HOOK_COND include/linux/netfilter.h:238 [inline]
ip6_output+0x1f4/0x850 net/ipv6/ip6_output.c:163
dst_output include/net/dst.h:458 [inline]
NF_HOOK.constprop.35+0xff/0x630 include/linux/netfilter.h:249
mld_sendpack+0x6a8/0xcc0 net/ipv6/mcast.c:1660
mld_send_cr net/ipv6/mcast.c:1951 [inline]
mld_ifc_timer_expire+0x3c5/0x750 net/ipv6/mcast.c:2448
call_timer_fn+0x246/0x850 kernel/time/timer.c:1281
expire_timers kernel/time/timer.c:1320 [inline]
__run_timers+0x7fd/0xb90 kernel/time/timer.c:1620
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
__do_softirq+0x29d/0xbb2 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:540 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1041
apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
</IRQ>
RIP: 0010:___might_sleep+0x1/0x470 kernel/sched/core.c:6005
RSP: 0000:ffff8801c29476a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: ffff8801c2502100 RBX: 000000000000016d RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000000011ef RDI: ffffffff84f08500
RBP: ffff8801c29476f8 R08: 0000160000000000 R09: 0000000000000000
R10: ffffffffffffffe8 R11: 0000000000000000 R12: ffffea0006528000
R13: 00000000000001b4 R14: dffffc0000000000 R15: ffffffff84f08500
__do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
do_huge_pmd_anonymous_page+0x59c/0x1b00 mm/huge_memory.c:728
create_huge_pmd mm/memory.c:3823 [inline]
__handle_mm_fault+0x1827/0x39c0 mm/memory.c:4026
handle_mm_fault+0x334/0x8d0 mm/memory.c:4092
__do_page_fault+0x5bd/0xd60 arch/x86/mm/fault.c:1444
do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0033:0x405424
RSP: 002b:0000000000a6f8e0 EFLAGS: 00010246
RAX: 0000000020b91000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: eb7cab32f103e719 RSI: 0000000000000000 RDI: 0000000000ae8848
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000005d
R10: 0000000000a6f980 R11: 0000000000000000 R12: fffffffffffffffe
R13: 00000000007180b0 R14: 0000000020b91000 R15: 0000000000000016
Allocated by task 4064:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
__do_kmalloc mm/slab.c:3726 [inline]
__kmalloc+0x162/0x760 mm/slab.c:3735
kmalloc_array include/linux/slab.h:627 [inline]
kcalloc include/linux/slab.h:638 [inline]
__ptr_ring_init_queue_alloc include/linux/ptr_ring.h:441 [inline]
ptr_ring_resize_multiple include/linux/ptr_ring.h:599 [inline]
skb_array_resize_multiple include/linux/skb_array.h:200 [inline]
tun_queue_resize drivers/net/tun.c:2987 [inline]
tun_device_event+0x3d3/0xcd0 drivers/net/tun.c:3005
notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93
__raw_notifier_call_chain kernel/notifier.c:394 [inline]
raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1671
call_netdevice_notifiers+0x6a/0x90 net/core/dev.c:1687
do_setlink+0xbeb/0x38d0 net/core/rtnetlink.c:2135
rtnl_setlink+0x270/0x3c0 net/core/rtnetlink.c:2346
rtnetlink_rcv_msg+0x733/0x1090 net/core/rtnetlink.c:4292
netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2405
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4304
netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
sock_write_iter+0x320/0x5e0 net/socket.c:912
call_write_iter include/linux/fs.h:1770 [inline]
do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673
do_iter_write+0x15a/0x540 fs/read_write.c:952
vfs_writev+0x18a/0x340 fs/read_write.c:997
do_writev+0xfc/0x2a0 fs/read_write.c:1032
SYSC_writev fs/read_write.c:1105 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1102
entry_SYSCALL_64_fastpath+0x1f/0xbe
Freed by task 0:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3504 [inline]
kfree+0xca/0x250 mm/slab.c:3821
selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3807
security_cred_free+0x48/0x80 security/security.c:994
put_cred_rcu+0x106/0x400 kernel/cred.c:117
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2758 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
__do_softirq+0x29d/0xbb2 kernel/softirq.c:284
The buggy address belongs to the object at ffff8801c29adb80
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
32-byte region [ffff8801c29adb80, ffff8801c29adba0)
The buggy address belongs to the page:
page:ffffea00070a6b40 count:1 mapcount:0 mapping:ffff8801c29ad000
index:0xffff8801c29adfc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c29ad000 ffff8801c29adfc1 000000010000003f
raw: ffffea00070a8960 ffffea00070914e0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801c29ada80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801c29adb00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8801c29adb80: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8801c29adc00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801c29adc80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
syzbot will keep track of this bug report.
Once a fix for this bug is committed, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
To upstream this report, please reply with:
#syz upstream
syzkaller hit the following crash on
fb686cb13e51f4c342c84549dbe8a13bd0eddf36
git://git.cmpxchg.org/linux-mmots.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
CC: [ak...@linux-foundation.org alexande...@amd.com
ch...@chris-wilson.co.uk da...@davemloft.net fg...@ikuai8.com
gre...@linuxfoundation.org ja...@ovn.org ja...@redhat.com
jaso...@redhat.com linux-...@vger.kernel.org net...@vger.kernel.org
ste...@networkplumber.org tg...@linutronix.de tre...@gmail.com]
==================================================================
BUG: KASAN: slab-out-of-bounds in __ptr_ring_produce
include/linux/ptr_ring.h:107 [inline]
BUG: KASAN: slab-out-of-bounds in ptr_ring_produce
include/linux/ptr_ring.h:126 [inline]
BUG: KASAN: slab-out-of-bounds in skb_array_produce
include/linux/skb_array.h:48 [inline]
BUG: KASAN: slab-out-of-bounds in tun_net_xmit+0x120a/0x1280
drivers/net/tun.c:994
Read of size 8 at addr ffff8801c29adba0 by task syz-executor5/4054
CPU: 0 PID: 4054 Comm: syz-executor5 Not tainted 4.14.0-rc3-mm1+ #14
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x25b/0x340 mm/kasan/report.c:409
__asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:430
__ptr_ring_produce include/linux/ptr_ring.h:107 [inline]
ptr_ring_produce include/linux/ptr_ring.h:126 [inline]
skb_array_produce include/linux/skb_array.h:48 [inline]
tun_net_xmit+0x120a/0x1280 drivers/net/tun.c:994
__netdev_start_xmit include/linux/netdevice.h:4000 [inline]
netdev_start_xmit include/linux/netdevice.h:4009 [inline]
xmit_one net/core/dev.c:2979 [inline]
dev_hard_start_xmit+0x248/0xac0 net/core/dev.c:2995
sch_direct_xmit+0x31d/0x6d0 net/sched/sch_generic.c:186
__dev_xmit_skb net/core/dev.c:3177 [inline]
__dev_queue_xmit+0x16c6/0x2050 net/core/dev.c:3444
dev_queue_xmit+0x17/0x20 net/core/dev.c:3509
neigh_hh_output include/net/neighbour.h:471 [inline]
neigh_output include/net/neighbour.h:479 [inline]
ip6_finish_output2+0x13c4/0x22a0 net/ipv6/ip6_output.c:120
ip6_finish_output+0x2f9/0x920 net/ipv6/ip6_output.c:146
NF_HOOK_COND include/linux/netfilter.h:238 [inline]
ip6_output+0x1f4/0x850 net/ipv6/ip6_output.c:163
dst_output include/net/dst.h:458 [inline]
NF_HOOK.constprop.35+0xff/0x630 include/linux/netfilter.h:249
mld_sendpack+0x6a8/0xcc0 net/ipv6/mcast.c:1660
mld_send_cr net/ipv6/mcast.c:1951 [inline]
mld_ifc_timer_expire+0x3c5/0x750 net/ipv6/mcast.c:2448
call_timer_fn+0x246/0x850 kernel/time/timer.c:1281
expire_timers kernel/time/timer.c:1320 [inline]
__run_timers+0x7fd/0xb90 kernel/time/timer.c:1620
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
__do_softirq+0x29d/0xbb2 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:540 [inline]
smp_apic_timer_interrupt+0x16b/0x700 arch/x86/kernel/apic/apic.c:1041
apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:770
</IRQ>
RIP: 0010:___might_sleep+0x1/0x470 kernel/sched/core.c:6005
RSP: 0000:ffff8801c29476a8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff11
RAX: ffff8801c2502100 RBX: 000000000000016d RCX: 0000000000000000
RDX: 0000000000000000 RSI: 00000000000011ef RDI: ffffffff84f08500
RBP: ffff8801c29476f8 R08: 0000160000000000 R09: 0000000000000000
R10: ffffffffffffffe8 R11: 0000000000000000 R12: ffffea0006528000
R13: 00000000000001b4 R14: dffffc0000000000 R15: ffffffff84f08500
__do_huge_pmd_anonymous_page mm/huge_memory.c:570 [inline]
do_huge_pmd_anonymous_page+0x59c/0x1b00 mm/huge_memory.c:728
create_huge_pmd mm/memory.c:3823 [inline]
__handle_mm_fault+0x1827/0x39c0 mm/memory.c:4026
handle_mm_fault+0x334/0x8d0 mm/memory.c:4092
__do_page_fault+0x5bd/0xd60 arch/x86/mm/fault.c:1444
do_page_fault+0xee/0x720 arch/x86/mm/fault.c:1520
page_fault+0x22/0x30 arch/x86/entry/entry_64.S:1066
RIP: 0033:0x405424
RSP: 002b:0000000000a6f8e0 EFLAGS: 00010246
RAX: 0000000020b91000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: eb7cab32f103e719 RSI: 0000000000000000 RDI: 0000000000ae8848
RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000005d
R10: 0000000000a6f980 R11: 0000000000000000 R12: fffffffffffffffe
R13: 00000000007180b0 R14: 0000000020b91000 R15: 0000000000000016
Allocated by task 4064:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
__do_kmalloc mm/slab.c:3726 [inline]
__kmalloc+0x162/0x760 mm/slab.c:3735
kmalloc_array include/linux/slab.h:627 [inline]
kcalloc include/linux/slab.h:638 [inline]
__ptr_ring_init_queue_alloc include/linux/ptr_ring.h:441 [inline]
ptr_ring_resize_multiple include/linux/ptr_ring.h:599 [inline]
skb_array_resize_multiple include/linux/skb_array.h:200 [inline]
tun_queue_resize drivers/net/tun.c:2987 [inline]
tun_device_event+0x3d3/0xcd0 drivers/net/tun.c:3005
notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93
__raw_notifier_call_chain kernel/notifier.c:394 [inline]
raw_notifier_call_chain+0x2d/0x40 kernel/notifier.c:401
call_netdevice_notifiers_info+0x51/0x90 net/core/dev.c:1671
call_netdevice_notifiers+0x6a/0x90 net/core/dev.c:1687
do_setlink+0xbeb/0x38d0 net/core/rtnetlink.c:2135
rtnl_setlink+0x270/0x3c0 net/core/rtnetlink.c:2346
rtnetlink_rcv_msg+0x733/0x1090 net/core/rtnetlink.c:4292
netlink_rcv_skb+0x216/0x440 net/netlink/af_netlink.c:2405
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:4304
netlink_unicast_kernel net/netlink/af_netlink.c:1273 [inline]
netlink_unicast+0x4e8/0x6f0 net/netlink/af_netlink.c:1299
netlink_sendmsg+0xa4a/0xe70 net/netlink/af_netlink.c:1862
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:643
sock_write_iter+0x320/0x5e0 net/socket.c:912
call_write_iter include/linux/fs.h:1770 [inline]
do_iter_readv_writev+0x531/0x7f0 fs/read_write.c:673
do_iter_write+0x15a/0x540 fs/read_write.c:952
vfs_writev+0x18a/0x340 fs/read_write.c:997
do_writev+0xfc/0x2a0 fs/read_write.c:1032
SYSC_writev fs/read_write.c:1105 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1102
entry_SYSCALL_64_fastpath+0x1f/0xbe
Freed by task 0:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3504 [inline]
kfree+0xca/0x250 mm/slab.c:3821
selinux_cred_free+0x48/0x70 security/selinux/hooks.c:3807
security_cred_free+0x48/0x80 security/security.c:994
put_cred_rcu+0x106/0x400 kernel/cred.c:117
__rcu_reclaim kernel/rcu/rcu.h:195 [inline]
rcu_do_batch kernel/rcu/tree.c:2758 [inline]
invoke_rcu_callbacks kernel/rcu/tree.c:3012 [inline]
__rcu_process_callbacks kernel/rcu/tree.c:2979 [inline]
rcu_process_callbacks+0xd74/0x17d0 kernel/rcu/tree.c:2996
__do_softirq+0x29d/0xbb2 kernel/softirq.c:284
The buggy address belongs to the object at ffff8801c29adb80
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes to the right of
32-byte region [ffff8801c29adb80, ffff8801c29adba0)
The buggy address belongs to the page:
page:ffffea00070a6b40 count:1 mapcount:0 mapping:ffff8801c29ad000
index:0xffff8801c29adfc1
flags: 0x200000000000100(slab)
raw: 0200000000000100 ffff8801c29ad000 ffff8801c29adfc1 000000010000003f
raw: ffffea00070a8960 ffffea00070914e0 ffff8801dac001c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801c29ada80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801c29adb00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
> ffff8801c29adb80: 00 00 00 00 fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8801c29adc00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8801c29adc80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzk...@googlegroups.com.
syzbot will keep track of this bug report.
Once a fix for this bug is committed, please reply to this email with:
#syz fix: exact-commit-title
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug
report.
To upstream this report, please reply with:
#syz upstream
Dmitry Vyukov
Dec 6, 2017, 7:46:56 AM12/6/17
to syzbot, 'Dmitry Vyukov' via syzkaller-upstream-moderation
last happened 2 months ago and there was a bunch of bugs fixed in tun
#syz invalid
On Thu, Oct 19, 2017 at 7:54 AM, syzbot
<bot+0b92f4581f756b6f5e...@syzkaller.appspotmail.com>
wrote:
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On Thu, Oct 19, 2017 at 7:54 AM, syzbot
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