KASAN: use-after-free Read in ip_defrag
20 views
Skip to first unread message
syzbot
Jan 4, 2018, 7:43:03 AM1/4/18
to da...@davemloft.net, kuz...@ms2.inr.ac.ru, linux-...@vger.kernel.org, net...@vger.kernel.org, syzkall...@googlegroups.com, yosh...@linux-ipv6.org
Hello,
syzkaller hit the following crash on
6bb8824732f69de0f233ae6b1a8158e149627b38
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
Unfortunately, I don't have any reproducer for this bug yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e6a2ce...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
==================================================================
BUG: KASAN: use-after-free in ip_frag_queue net/ipv4/ip_fragment.c:413
[inline]
BUG: KASAN: use-after-free in ip_defrag+0x3d64/0x4140
net/ipv4/ip_fragment.c:682
Read of size 4 at addr ffff8801d4131100 by task syz-executor2/13372
CPU: 1 PID: 13372 Comm: syz-executor2 Not tainted 4.15.0-rc5+ #170
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
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_load4_noabort+0x14/0x20 mm/kasan/report.c:429
ip_frag_queue net/ipv4/ip_fragment.c:413 [inline]
ip_defrag+0x3d64/0x4140 net/ipv4/ip_fragment.c:682
ip_local_deliver+0x174/0x6e0 net/ipv4/ip_input.c:253
dst_input include/net/dst.h:449 [inline]
ip_rcv_finish+0x881/0x19a0 net/ipv4/ip_input.c:397
NF_HOOK include/linux/netfilter.h:250 [inline]
ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493
__netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4499
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4564
netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4638
napi_frags_finish net/core/dev.c:5079 [inline]
napi_gro_frags+0x57b/0xad0 net/core/dev.c:5152
tun_get_user+0x271f/0x3900 drivers/net/tun.c:1791
tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1836
call_write_iter include/linux/fs.h:1772 [inline]
do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529a1
RSP: 002b:00007fc69300cb80 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000020b92000 RCX: 00000000004529a1
RDX: 0000000000000001 RSI: 00007fc69300cbd0 RDI: 0000000000000012
RBP: 0000000000000042 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003f R11: 0000000000000293 R12: 00000000006f68a8
R13: 00000000ffffffff R14: 00007fc69300d6d4 R15: 0000000000000000
Allocated by task 3190:
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
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
skb_clone+0x1ae/0x480 net/core/skbuff.c:1279
dev_queue_xmit_nit+0x40e/0xc40 net/core/dev.c:1948
xmit_one net/core/dev.c:3004 [inline]
dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:3024
sch_direct_xmit+0x42b/0xe80 net/sched/sch_generic.c:314
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x571/0x19b0 net/sched/sch_generic.c:388
__dev_xmit_skb net/core/dev.c:3188 [inline]
__dev_queue_xmit+0xb1f/0x2590 net/core/dev.c:3489
dev_queue_xmit+0x17/0x20 net/core/dev.c:3554
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip_finish_output2+0xeed/0x14f0 net/ipv4/ip_output.c:229
ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:443 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
ip_queue_xmit+0x8c0/0x18e0 net/ipv4/ip_output.c:504
tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
__tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2540
tcp_push+0x538/0x770 net/ipv4/tcp.c:728
tcp_sendmsg_locked+0x2870/0x3c40 net/ipv4/tcp.c:1428
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1465
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:628 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:638
sock_write_iter+0x31a/0x5d0 net/socket.c:907
call_write_iter include/linux/fs.h:1772 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x684/0x970 fs/read_write.c:482
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
entry_SYSCALL_64_fastpath+0x1f/0x96
Freed by task 3190:
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:3488 [inline]
kmem_cache_free+0x83/0x2a0 mm/slab.c:3746
kfree_skbmem+0x1a1/0x1d0 net/core/skbuff.c:582
__kfree_skb net/core/skbuff.c:642 [inline]
kfree_skb+0x165/0x4c0 net/core/skbuff.c:659
packet_rcv_spkt+0x117/0x5b0 net/packet/af_packet.c:1872
dev_queue_xmit_nit+0x866/0xc40 net/core/dev.c:1980
xmit_one net/core/dev.c:3004 [inline]
dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:3024
sch_direct_xmit+0x42b/0xe80 net/sched/sch_generic.c:314
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x571/0x19b0 net/sched/sch_generic.c:388
__dev_xmit_skb net/core/dev.c:3188 [inline]
__dev_queue_xmit+0xb1f/0x2590 net/core/dev.c:3489
dev_queue_xmit+0x17/0x20 net/core/dev.c:3554
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip_finish_output2+0xeed/0x14f0 net/ipv4/ip_output.c:229
ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:443 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
ip_queue_xmit+0x8c0/0x18e0 net/ipv4/ip_output.c:504
tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
__tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2540
tcp_push+0x538/0x770 net/ipv4/tcp.c:728
tcp_sendmsg_locked+0x2870/0x3c40 net/ipv4/tcp.c:1428
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1465
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:628 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:638
sock_write_iter+0x31a/0x5d0 net/socket.c:907
call_write_iter include/linux/fs.h:1772 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x684/0x970 fs/read_write.c:482
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
entry_SYSCALL_64_fastpath+0x1f/0x96
The buggy address belongs to the object at ffff8801d41310c0
which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 64 bytes inside of
224-byte region [ffff8801d41310c0, ffff8801d41311a0)
The buggy address belongs to the page:
page:00000000f21301b4 count:1 mapcount:0 mapping:00000000324eb6c2 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d41310c0 0000000000000000 000000010000000c
raw: ffffea00073f69e0 ffffea000744efa0 ffff8801d986bcc0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d4131000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d4131080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff8801d4131100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801d4131180: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d4131200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, 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.
Note: all commands must start from beginning of the line in the email body.
syzkaller hit the following crash on
6bb8824732f69de0f233ae6b1a8158e149627b38
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
Unfortunately, I don't have any reproducer for this bug yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e6a2ce...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.
==================================================================
BUG: KASAN: use-after-free in ip_frag_queue net/ipv4/ip_fragment.c:413
[inline]
BUG: KASAN: use-after-free in ip_defrag+0x3d64/0x4140
net/ipv4/ip_fragment.c:682
Read of size 4 at addr ffff8801d4131100 by task syz-executor2/13372
CPU: 1 PID: 13372 Comm: syz-executor2 Not tainted 4.15.0-rc5+ #170
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
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_load4_noabort+0x14/0x20 mm/kasan/report.c:429
ip_frag_queue net/ipv4/ip_fragment.c:413 [inline]
ip_defrag+0x3d64/0x4140 net/ipv4/ip_fragment.c:682
ip_local_deliver+0x174/0x6e0 net/ipv4/ip_input.c:253
dst_input include/net/dst.h:449 [inline]
ip_rcv_finish+0x881/0x19a0 net/ipv4/ip_input.c:397
NF_HOOK include/linux/netfilter.h:250 [inline]
ip_rcv+0xc3f/0x1820 net/ipv4/ip_input.c:493
__netif_receive_skb_core+0x1a3e/0x3450 net/core/dev.c:4499
__netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4564
netif_receive_skb_internal+0x10b/0x670 net/core/dev.c:4638
napi_frags_finish net/core/dev.c:5079 [inline]
napi_gro_frags+0x57b/0xad0 net/core/dev.c:5152
tun_get_user+0x271f/0x3900 drivers/net/tun.c:1791
tun_chr_write_iter+0xb9/0x160 drivers/net/tun.c:1836
call_write_iter include/linux/fs.h:1772 [inline]
do_iter_readv_writev+0x525/0x7f0 fs/read_write.c:653
do_iter_write+0x154/0x540 fs/read_write.c:932
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x4529a1
RSP: 002b:00007fc69300cb80 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 0000000020b92000 RCX: 00000000004529a1
RDX: 0000000000000001 RSI: 00007fc69300cbd0 RDI: 0000000000000012
RBP: 0000000000000042 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000003f R11: 0000000000000293 R12: 00000000006f68a8
R13: 00000000ffffffff R14: 00007fc69300d6d4 R15: 0000000000000000
Allocated by task 3190:
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
kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:489
kmem_cache_alloc+0x12e/0x760 mm/slab.c:3544
skb_clone+0x1ae/0x480 net/core/skbuff.c:1279
dev_queue_xmit_nit+0x40e/0xc40 net/core/dev.c:1948
xmit_one net/core/dev.c:3004 [inline]
dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:3024
sch_direct_xmit+0x42b/0xe80 net/sched/sch_generic.c:314
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x571/0x19b0 net/sched/sch_generic.c:388
__dev_xmit_skb net/core/dev.c:3188 [inline]
__dev_queue_xmit+0xb1f/0x2590 net/core/dev.c:3489
dev_queue_xmit+0x17/0x20 net/core/dev.c:3554
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip_finish_output2+0xeed/0x14f0 net/ipv4/ip_output.c:229
ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:443 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
ip_queue_xmit+0x8c0/0x18e0 net/ipv4/ip_output.c:504
tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
__tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2540
tcp_push+0x538/0x770 net/ipv4/tcp.c:728
tcp_sendmsg_locked+0x2870/0x3c40 net/ipv4/tcp.c:1428
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1465
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:628 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:638
sock_write_iter+0x31a/0x5d0 net/socket.c:907
call_write_iter include/linux/fs.h:1772 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x684/0x970 fs/read_write.c:482
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
entry_SYSCALL_64_fastpath+0x1f/0x96
Freed by task 3190:
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:3488 [inline]
kmem_cache_free+0x83/0x2a0 mm/slab.c:3746
kfree_skbmem+0x1a1/0x1d0 net/core/skbuff.c:582
__kfree_skb net/core/skbuff.c:642 [inline]
kfree_skb+0x165/0x4c0 net/core/skbuff.c:659
packet_rcv_spkt+0x117/0x5b0 net/packet/af_packet.c:1872
dev_queue_xmit_nit+0x866/0xc40 net/core/dev.c:1980
xmit_one net/core/dev.c:3004 [inline]
dev_hard_start_xmit+0x16b/0xac0 net/core/dev.c:3024
sch_direct_xmit+0x42b/0xe80 net/sched/sch_generic.c:314
qdisc_restart net/sched/sch_generic.c:380 [inline]
__qdisc_run+0x571/0x19b0 net/sched/sch_generic.c:388
__dev_xmit_skb net/core/dev.c:3188 [inline]
__dev_queue_xmit+0xb1f/0x2590 net/core/dev.c:3489
dev_queue_xmit+0x17/0x20 net/core/dev.c:3554
neigh_hh_output include/net/neighbour.h:472 [inline]
neigh_output include/net/neighbour.h:480 [inline]
ip_finish_output2+0xeed/0x14f0 net/ipv4/ip_output.c:229
ip_finish_output+0x85e/0xd10 net/ipv4/ip_output.c:317
NF_HOOK_COND include/linux/netfilter.h:239 [inline]
ip_output+0x1cc/0x860 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:443 [inline]
ip_local_out+0x95/0x160 net/ipv4/ip_output.c:124
ip_queue_xmit+0x8c0/0x18e0 net/ipv4/ip_output.c:504
tcp_transmit_skb+0x1b12/0x38b0 net/ipv4/tcp_output.c:1176
tcp_write_xmit+0x680/0x5190 net/ipv4/tcp_output.c:2367
__tcp_push_pending_frames+0xa0/0x250 net/ipv4/tcp_output.c:2540
tcp_push+0x538/0x770 net/ipv4/tcp.c:728
tcp_sendmsg_locked+0x2870/0x3c40 net/ipv4/tcp.c:1428
tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1465
inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764
sock_sendmsg_nosec net/socket.c:628 [inline]
sock_sendmsg+0xca/0x110 net/socket.c:638
sock_write_iter+0x31a/0x5d0 net/socket.c:907
call_write_iter include/linux/fs.h:1772 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x684/0x970 fs/read_write.c:482
vfs_write+0x189/0x510 fs/read_write.c:544
SYSC_write fs/read_write.c:589 [inline]
SyS_write+0xef/0x220 fs/read_write.c:581
entry_SYSCALL_64_fastpath+0x1f/0x96
The buggy address belongs to the object at ffff8801d41310c0
which belongs to the cache skbuff_head_cache of size 224
The buggy address is located 64 bytes inside of
224-byte region [ffff8801d41310c0, ffff8801d41311a0)
The buggy address belongs to the page:
page:00000000f21301b4 count:1 mapcount:0 mapping:00000000324eb6c2 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801d41310c0 0000000000000000 000000010000000c
raw: ffffea00073f69e0 ffffea000744efa0 ffff8801d986bcc0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8801d4131000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d4131080: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb
> ffff8801d4131100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8801d4131180: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc
ffff8801d4131200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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.
If you forgot to add the Reported-by tag, once the fix for this bug is
merged
into any tree, 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.
Note: all commands must start from beginning of the line in the email body.
syzbot
Feb 22, 2019, 5:34:45 AM2/22/19
to syzkall...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
Reply all
Reply to author
Forward
0 new messages