syzbot


general protection fault in wg_index_hashtable_replace

Status: fixed on 2020/10/10 01:52
Subsystems: wireguard
[Documentation on labels]
Fix commit: 9179ba31367b wireguard: noise: take lock when removing handshake entry from table
First crash: 1386d, last: 1375d

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 7395 Comm: kworker/0:3 Not tainted 5.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: wg-kex-wg1 wg_packet_handshake_receive_worker
RIP: 0010:hlist_replace_rcu include/linux/rculist.h:505 [inline]
RIP: 0010:wg_index_hashtable_replace+0x176/0x330 drivers/net/wireguard/peerlookup.c:174
Code: 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 44 01 00 00 48 b9 00 00 00 00 00 fc ff df 48 8b 45 10 48 89 c6 48 c1 ee 03 <80> 3c 0e 00 0f 85 06 01 00 00 48 85 d2 4c 89 28 74 47 e8 a3 4f b5
RSP: 0018:ffffc90006a97bf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888050ffc4f8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808e04e010
RBP: ffff88808e04e000 R08: 0000000000000001 R09: ffff8880543d0000
R10: ffffed100a87a000 R11: 000000000000016e R12: ffff8880543d0000
R13: ffff88808e04e008 R14: ffff888050ffc508 R15: ffff888050ffc500
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f5505db0 CR3: 0000000097cf7000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 wg_noise_handshake_begin_session+0x752/0xc9a drivers/net/wireguard/noise.c:820
 wg_receive_handshake_packet drivers/net/wireguard/receive.c:183 [inline]
 wg_packet_handshake_receive_worker+0x33b/0x730 drivers/net/wireguard/receive.c:220
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
---[ end trace 0d737db78b72da84 ]---
RIP: 0010:hlist_replace_rcu include/linux/rculist.h:505 [inline]
RIP: 0010:wg_index_hashtable_replace+0x176/0x330 drivers/net/wireguard/peerlookup.c:174
Code: 00 fc ff df 48 89 f9 48 c1 e9 03 80 3c 01 00 0f 85 44 01 00 00 48 b9 00 00 00 00 00 fc ff df 48 8b 45 10 48 89 c6 48 c1 ee 03 <80> 3c 0e 00 0f 85 06 01 00 00 48 85 d2 4c 89 28 74 47 e8 a3 4f b5
RSP: 0018:ffffc90006a97bf8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888050ffc4f8 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88808e04e010
RBP: ffff88808e04e000 R08: 0000000000000001 R09: ffff8880543d0000
R10: ffffed100a87a000 R11: 000000000000016e R12: ffff8880543d0000
R13: ffff88808e04e008 R14: ffff888050ffc508 R15: ffff888050ffc500
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f5505db0 CR3: 0000000097cf7000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/09/07 22:32 upstream f4d51dffc6c0 abf9ba4f .config console log report ci-upstream-kasan-gce-386
2020/09/19 00:13 bpf-next b6ed6cf4a3ac 53ce8104 .config console log report info ci-upstream-bpf-next-kasan-gce
* Struck through repros no longer work on HEAD.