syzbot


general protection fault in jhash

Status: fixed on 2023/06/08 14:41
Subsystems: wireless
[Documentation on labels]
Fix commit: 2bef4d1fb8b3 wifi: mac80211_hwsim: fix potential NULL deref in hwsim_pmsr_report_nl()
First crash: 384d, last: 364d
Cause bisection: introduced by (bisect log) :
commit 2af3b2a631b194a43551ce119cb71559d8f6b54b
Author: Jaewan Kim <jaewan@google.com>
Date: Wed Mar 22 13:16:37 2023 +0000

  mac80211_hwsim: add PMSR report support via virtio

Crash: general protection fault in jhash (log)
Repro: C syz .config
  
Fix bisection: fixed by (bisect log) :
commit 1aa866931b8026a0dd636e9ef7b5c5dfb4cc5ce8
Author: Conor Dooley <conor.dooley@microchip.com>
Date: Fri Mar 24 10:05:38 2023 +0000

  RISC-V: add non-alternative fallback for riscv_has_extension_[un]likely()

  
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in jhash bpf C 8 3d18h 12d 0/26 upstream: reported C repro on 2024/04/07 05:59

Sample crash report:
netlink: 240 bytes leftover after parsing attributes in process `syz-executor104'.
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 5084 Comm: syz-executor104 Not tainted 6.3.0-rc4-next-20230331-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023
RIP: 0010:jhash+0x339/0x610 include/linux/jhash.h:95
Code: 83 fd 01 0f 84 5f ff ff ff eb de 83 fd 05 74 3a e8 ac f5 71 fd 48 8d 7b 05 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 96 02 00 00
RSP: 0018:ffffc90003abf298 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff84111ba4 RDI: 0000000000000009
RBP: 0000000000000006 R08: 0000000000000005 R09: 000000000000000c
R10: 0000000000000006 R11: 0000000000000000 R12: 000000004d2c27cd
R13: 000000002bd9e6c2 R14: 000000002bd9e6c2 R15: 000000002bd9e6c2
FS:  0000555556847300(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045ad50 CR3: 0000000078aa6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rht_key_hashfn include/linux/rhashtable.h:159 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:604 [inline]
 rhashtable_lookup include/linux/rhashtable.h:646 [inline]
 rhashtable_lookup_fast include/linux/rhashtable.h:672 [inline]
 get_hwsim_data_ref_from_addr+0xb9/0x600 drivers/net/wireless/virtual/mac80211_hwsim.c:757
 hwsim_pmsr_report_nl+0xe7/0xd50 drivers/net/wireless/virtual/mac80211_hwsim.c:3764
 genl_family_rcv_msg_doit.isra.0+0x1e6/0x2d0 net/netlink/genetlink.c:968
 genl_family_rcv_msg net/netlink/genetlink.c:1048 [inline]
 genl_rcv_msg+0x4ff/0x7e0 net/netlink/genetlink.c:1065
 netlink_rcv_skb+0x165/0x440 net/netlink/af_netlink.c:2572
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1076
 netlink_unicast_kernel net/netlink/af_netlink.c:1339 [inline]
 netlink_unicast+0x547/0x7f0 net/netlink/af_netlink.c:1365
 netlink_sendmsg+0x925/0xe30 net/netlink/af_netlink.c:1942
 sock_sendmsg_nosec net/socket.c:724 [inline]
 sock_sendmsg+0xde/0x190 net/socket.c:747
 ____sys_sendmsg+0x71c/0x900 net/socket.c:2501
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2555
 __sys_sendmsg+0xf7/0x1c0 net/socket.c:2584
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f9e9abb5c49
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:00007ffc660e8198 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9e9abb5c49
RDX: 0000000000000000 RSI: 0000000020001ac0 RDI: 0000000000000003
RBP: 00007f9e9ab79df0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9e9ab79e80
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:jhash+0x339/0x610 include/linux/jhash.h:95
Code: 83 fd 01 0f 84 5f ff ff ff eb de 83 fd 05 74 3a e8 ac f5 71 fd 48 8d 7b 05 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 96 02 00 00
RSP: 0018:ffffc90003abf298 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000004 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffffffff84111ba4 RDI: 0000000000000009
RBP: 0000000000000006 R08: 0000000000000005 R09: 000000000000000c
R10: 0000000000000006 R11: 0000000000000000 R12: 000000004d2c27cd
R13: 000000002bd9e6c2 R14: 000000002bd9e6c2 R15: 000000002bd9e6c2
FS:  0000555556847300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056356e2d1270 CR3: 0000000078aa6000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	83 fd 01             	cmp    $0x1,%ebp
   3:	0f 84 5f ff ff ff    	je     0xffffff68
   9:	eb de                	jmp    0xffffffe9
   b:	83 fd 05             	cmp    $0x5,%ebp
   e:	74 3a                	je     0x4a
  10:	e8 ac f5 71 fd       	callq  0xfd71f5c1
  15:	48 8d 7b 05          	lea    0x5(%rbx),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	38 d0                	cmp    %dl,%al
  36:	7f 08                	jg     0x40
  38:	84 c0                	test   %al,%al
  3a:	0f 85 96 02 00 00    	jne    0x2d6

Crashes (15):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/04/01 09:26 linux-next 4b0f4525dc4f f325deb0 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in jhash
2023/04/01 10:41 net-next 54fd494af9d4 f325deb0 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/20 19:36 net-next a5962e0a8b7b 2b32bd34 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/19 10:35 net-next dce46f1b0cab 94b4184e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/18 07:15 net-next 99676a576641 436577a9 .config console log report info ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/16 14:35 net-next e61caf04b9f8 ec410564 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/14 20:01 net-next c11d2e718c79 3cfcaa1b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/10 22:57 net-next 490fde262f17 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/10 00:56 net-next 5a17818682cf 71147e29 .config console log report info ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/09 02:30 net-next 48b7ea1d22dd 71147e29 .config console log report info ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/08 19:43 net-next 48b7ea1d22dd 71147e29 .config console log report info ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/08 15:45 net-next 9ba3b26c0c96 71147e29 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/07 05:57 net-next d9c960675adc 00ce4c67 .config console log report info ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/02 01:18 net-next d74aab2ca198 f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce general protection fault in jhash
2023/04/01 09:00 linux-next 4b0f4525dc4f f325deb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in jhash
* Struck through repros no longer work on HEAD.