syzbot


KASAN: use-after-free Read in __dev_queue_xmit

Status: fixed on 2018/05/09 07:47
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+71d74a5406d02057d559@syzkaller.appspotmail.com
Fix commit: d0c081b49137 flow_dissector: properly cap thoff field
First crash: 2388d, last: 2265d
Discussions (6)
Title Replies (including bot) Last reply
[PATCH 4.4 00/92] 4.4.133-stable review 126 (126) 2018/11/01 21:45
[PATCH net] packet: in packet_snd start writing at link layer allocation 6 (6) 2018/05/24 22:13
[PATCH 4.16 000/161] 4.16.12-stable review 171 (171) 2018/05/24 19:47
[PATCH 4.14 000/165] 4.14.44-stable review 176 (176) 2018/05/24 19:46
[PATCH 4.9 00/96] 4.9.103-stable review 101 (101) 2018/05/24 19:26
KASAN: use-after-free Read in __dev_queue_xmit 9 (10) 2018/05/10 21:49
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 KASAN: use-after-free Read in __dev_queue_xmit C 46 1698d 1920d 0/3 public: reported C repro on 2019/04/13 00:00
upstream KASAN: use-after-free Read in __dev_queue_xmit (4) block 1 1450d 1450d 0/27 auto-closed as invalid on 2020/10/23 09:56
upstream KASAN: use-after-free Read in __dev_queue_xmit (5) block C unreliable error 49 135d 1014d 0/27 upstream: reported C repro on 2021/10/04 21:37
upstream KASAN: use-after-free Read in __dev_queue_xmit (2) net C 2 2247d 2247d 5/27 fixed on 2018/06/07 13:52
upstream KASAN: use-after-free Read in __dev_queue_xmit (3) net 11 2114d 2117d 11/27 fixed on 2018/11/12 21:25
linux-6.1 KASAN: use-after-free Read in __dev_queue_xmit origin:upstream C error 2 79d 442d 0/3 upstream: reported C repro on 2023/04/29 13:33
linux-5.15 KASAN: use-after-free Read in __dev_queue_xmit origin:upstream missing-backport C error 3 163d 413d 0/3 upstream: reported C repro on 2023/05/28 17:42
linux-4.19 KASAN: use-after-free Read in __dev_queue_xmit C error 15 500d 1172d 0/1 upstream: reported C repro on 2021/04/30 04:08
linux-4.14 KASAN: use-after-free Read in __dev_queue_xmit C error 1 674d 886d 0/1 upstream: reported C repro on 2022/02/10 06:42

Sample crash report:
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
==================================================================
BUG: KASAN: use-after-free in qdisc_pkt_len_init net/core/dev.c:3195 [inline]
BUG: KASAN: use-after-free in __dev_queue_xmit+0x2ca1/0x34c0 net/core/dev.c:3528
Read of size 2 at addr ffff8801b288a344 by task syz-executor752/4495

CPU: 0 PID: 4495 Comm: syz-executor752 Not tainted 4.17.0-rc3+ #28
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+0x1b9/0x294 lib/dump_stack.c:113
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412
 __asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:431
 qdisc_pkt_len_init net/core/dev.c:3195 [inline]
 __dev_queue_xmit+0x2ca1/0x34c0 net/core/dev.c:3528
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3617
 packet_snd net/packet/af_packet.c:2951 [inline]
 packet_sendmsg+0x40f8/0x6070 net/packet/af_packet.c:2976
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4418f9
RSP: 002b:00007fffefdfb988 EFLAGS: 00000217 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004418f9
RDX: 0492492492492510 RSI: 0000000020871fc8 RDI: 0000000000000003
RBP: 00000000006cd018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000217 R12: 00000000004025f0
R13: 0000000000402680 R14: 0000000000000000 R15: 0000000000000000

Allocated by task 4495:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553
 __do_kmalloc_node mm/slab.c:3682 [inline]
 __kmalloc_node_track_caller+0x47/0x70 mm/slab.c:3696
 __kmalloc_reserve.isra.38+0x3a/0xe0 net/core/skbuff.c:137
 __alloc_skb+0x14d/0x780 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:987 [inline]
 alloc_skb_with_frags+0x137/0x760 net/core/skbuff.c:5249
 sock_alloc_send_pskb+0x87a/0xae0 net/core/sock.c:2088
 packet_alloc_skb net/packet/af_packet.c:2810 [inline]
 packet_snd net/packet/af_packet.c:2901 [inline]
 packet_sendmsg+0x1b98/0x6070 net/packet/af_packet.c:2976
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4495:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x11a/0x170 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 __cache_free mm/slab.c:3498 [inline]
 kfree+0xd9/0x260 mm/slab.c:3813
 skb_free_head+0x99/0xc0 net/core/skbuff.c:550
 skb_release_data+0x690/0x860 net/core/skbuff.c:570
 skb_release_all+0x4a/0x60 net/core/skbuff.c:627
 __kfree_skb net/core/skbuff.c:641 [inline]
 kfree_skb+0x195/0x560 net/core/skbuff.c:659
 __skb_complete_tx_timestamp+0x333/0x420 net/core/skbuff.c:4300
 __skb_tstamp_tx+0x486/0x6a0 net/core/skbuff.c:4385
 __dev_queue_xmit+0x29c5/0x34c0 net/core/dev.c:3519
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3617
 packet_snd net/packet/af_packet.c:2951 [inline]
 packet_sendmsg+0x40f8/0x6070 net/packet/af_packet.c:2976
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xd5/0x120 net/socket.c:639
 ___sys_sendmsg+0x525/0x940 net/socket.c:2117
 __sys_sendmmsg+0x240/0x6f0 net/socket.c:2212
 __do_sys_sendmmsg net/socket.c:2241 [inline]
 __se_sys_sendmmsg net/socket.c:2238 [inline]
 __x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2238
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8801b288a280
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 196 bytes inside of
 512-byte region [ffff8801b288a280, ffff8801b288a480)
The buggy address belongs to the page:
page:ffffea0006ca2280 count:1 mapcount:0 mapping:ffff8801b288a000 index:0x0
flags: 0x2fffc0000000100(slab)
raw: 02fffc0000000100 ffff8801b288a000 0000000000000000 0000000100000006
raw: ffffea0006b8cfe0 ffff8801da801748 ffff8801da800940 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801b288a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801b288a280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8801b288a300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8801b288a380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8801b288a400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

Crashes (10):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2018/05/02 11:04 upstream f2125992e7cb d5b114b4 .config console log report syz C ci-upstream-kasan-gce-root
2017/12/31 08:30 linux-next 0e08c463db38 bb6384b8 .config console log report syz C ci-upstream-next-kasan-gce
2017/12/31 04:07 mmots 37759fa6d0fa bb6384b8 .config console log report syz C ci-upstream-mmots-kasan-gce
2018/01/13 20:35 mmots ce3c209f6733 c9e7aeae .config console log report ci-upstream-mmots-kasan-gce
2018/01/10 20:54 mmots 69eed2290e1d 02a19b64 .config console log report ci-upstream-mmots-kasan-gce
2018/01/10 05:01 mmots 69eed2290e1d 1f60c828 .config console log report ci-upstream-mmots-kasan-gce
2018/01/09 19:02 mmots 69eed2290e1d a7899a58 .config console log report ci-upstream-mmots-kasan-gce
2018/01/09 07:35 mmots 69eed2290e1d 11dc42f6 .config console log report ci-upstream-mmots-kasan-gce
2018/01/09 05:54 mmots 69eed2290e1d 11dc42f6 .config console log report ci-upstream-mmots-kasan-gce
2018/01/07 18:39 linux-next 990b6a07d18c 19c05fff .config console log report ci-upstream-next-kasan-gce
* Struck through repros no longer work on HEAD.