syzbot


general protection fault in hwsim_del_edge_nl

Status: fixed on 2021/11/10 00:50
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: 0303b30375df ieee802154: hwsim: avoid possible crash in hwsim_del_edge_nl()
First crash: 597d, last: 597d

Cause bisection: introduced by (bisect log) :
commit 997acaf6b4b59c6a9c259740312a69ea549cc684
Author: Mark Rutland <mark.rutland@arm.com>
Date: Mon Jan 11 15:37:07 2021 +0000

  lockdep: report broken irq restoration

Crash: WARNING in kvm_wait (log)
Repro: C syz .config

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: 8438 Comm: syz-executor098 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
RIP: 0010:hwsim_del_edge_nl+0xf4/0x7c0 drivers/net/ieee802154/mac802154_hwsim.c:487
Code: 00 0f 85 80 06 00 00 4d 85 ed 48 8b 5b 10 0f 84 87 05 00 00 e8 8d e4 4a fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 cd
RSP: 0018:ffffc9000111f570 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8529f7f3 RDI: ffff888017673d10
RBP: ffffc9000111f678 R08: 0000000000000001 R09: ffffc9000111f6a8
R10: fffff52000223ed6 R11: 0000000000000000 R12: ffffc9000111f698
R13: ffff88802a378014 R14: ffff8880135be780 R15: 0000000000000000
FS:  00000000021dc300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 000000002abb4000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739
 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline]
 genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800
 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811
 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1929
 sock_sendmsg_nosec net/socket.c:654 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:674
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2337
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2391
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2420
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x43ef59
Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff0ab80248 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043ef59
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003
RBP: 0000000000402f40 R08: 0000000000000000 R09: 0000000000400488
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402fd0
R13: 0000000000000000 R14: 00000000004ac018 R15: 0000000000400488
Modules linked in:
---[ end trace 70bc8381c1572d71 ]---
RIP: 0010:nla_len include/net/netlink.h:1148 [inline]
RIP: 0010:nla_parse_nested_deprecated include/net/netlink.h:1231 [inline]
RIP: 0010:hwsim_del_edge_nl+0xf4/0x7c0 drivers/net/ieee802154/mac802154_hwsim.c:487
Code: 00 0f 85 80 06 00 00 4d 85 ed 48 8b 5b 10 0f 84 87 05 00 00 e8 8d e4 4a fc 48 89 da 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 14 02 48 89 d8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 cd
RSP: 0018:ffffc9000111f570 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8529f7f3 RDI: ffff888017673d10
RBP: ffffc9000111f678 R08: 0000000000000001 R09: ffffc9000111f6a8
R10: fffff52000223ed6 R11: 0000000000000000 R12: ffffc9000111f698
R13: ffff88802a378014 R14: ffff8880135be780 R15: 0000000000000000
FS:  00000000021dc300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5b4e249000 CR3: 000000002abb4000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (3):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci-upstream-net-this-kasan-gce 2021/06/17 20:16 net da5ac772cfe2 aba2b2fb .config console log report syz C general protection fault in hwsim_del_edge_nl
ci-upstream-net-kasan-gce 2021/06/17 22:02 net-next 01f1b6ed2b84 aba2b2fb .config console log report syz C general protection fault in hwsim_del_edge_nl
ci-upstream-net-this-kasan-gce 2021/06/17 20:01 net da5ac772cfe2 aba2b2fb .config console log report info general protection fault in hwsim_del_edge_nl
* Struck through repros no longer work on HEAD.