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general protection fault in nldev_stat_set_doit (2)

Status: fixed on 2022/03/08 16:11
Subsystems: rdma
[Documentation on labels]
Reported-by: syzbot+9111d2255a9710e87562@syzkaller.appspotmail.com
Fix commit: d821f7c13ca0 RDMA/nldev: Check stat attribute before accessing it
First crash: 894d, last: 882d
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH rdma-rc] RDMA/nldev: Check stat attribute before accessing it 2 (2) 2021/11/17 20:50
[syzbot] general protection fault in nldev_stat_set_doit (2) 1 (2) 2021/11/15 13:16
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream general protection fault in nldev_stat_set_doit rdma C done 8 1502d 1519d 15/26 fixed on 2020/04/15 17:19

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: 2530 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:nla_get_u32 include/net/netlink.h:1554 [inline]
RIP: 0010:nldev_stat_set_mode_doit drivers/infiniband/core/nldev.c:1909 [inline]
RIP: 0010:nldev_stat_set_doit+0x578/0x10d0 drivers/infiniband/core/nldev.c:2040
Code: fa 4c 8b a4 24 f8 02 00 00 48 b8 00 00 00 00 00 fc ff df c7 84 24 80 00 00 00 00 00 00 00 49 8d 7c 24 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 02
RSP: 0018:ffffc9000524f2e8 EFLAGS: 00010247
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90002b94000
RDX: 0000000000000000 RSI: ffffffff8684c62f RDI: 0000000000000004
RBP: ffff88802c690000 R08: 0000000000000000 R09: ffff88807e40602b
R10: ffffffff8684c607 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88802ced4dc0 R15: ffff88802ced4c80
FS:  00007f728dc8f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000019d77000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
 rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
 rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x86d/0xda0 net/netlink/af_netlink.c:1916
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:724
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f7290719ae9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f728dc8f188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f729082cf60 RCX: 00007f7290719ae9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007f7290773f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcff5660ef R14: 00007f728dc8f300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 9e77a64d46aeecd3 ]---
RIP: 0010:nla_get_u32 include/net/netlink.h:1554 [inline]
RIP: 0010:nldev_stat_set_mode_doit drivers/infiniband/core/nldev.c:1909 [inline]
RIP: 0010:nldev_stat_set_doit+0x578/0x10d0 drivers/infiniband/core/nldev.c:2040
Code: fa 4c 8b a4 24 f8 02 00 00 48 b8 00 00 00 00 00 fc ff df c7 84 24 80 00 00 00 00 00 00 00 49 8d 7c 24 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 02
RSP: 0018:ffffc9000524f2e8 EFLAGS: 00010247

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90002b94000
RDX: 0000000000000000 RSI: ffffffff8684c62f RDI: 0000000000000004
RBP: ffff88802c690000 R08: 0000000000000000 R09: ffff88807e40602b
R10: ffffffff8684c607 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: ffff88802ced4dc0 R15: ffff88802ced4c80
FS:  00007f728dc8f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000019d77000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	fa                   	cli
   1:	4c 8b a4 24 f8 02 00 	mov    0x2f8(%rsp),%r12
   8:	00
   9:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  10:	fc ff df
  13:	c7 84 24 80 00 00 00 	movl   $0x0,0x80(%rsp)
  1a:	00 00 00 00
  1e:	49 8d 7c 24 04       	lea    0x4(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 14 02          	movzbl (%rdx,%rax,1),%edx <-- trapping instruction
  2e:	48 89 f8             	mov    %rdi,%rax
  31:	83 e0 07             	and    $0x7,%eax
  34:	83 c0 03             	add    $0x3,%eax
  37:	38 d0                	cmp    %dl,%al
  39:	7c 08                	jl     0x43
  3b:	84 d2                	test   %dl,%dl
  3d:	0f                   	.byte 0xf
  3e:	85 02                	test   %eax,(%rdx)

Crashes (12):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/11/16 01:55 net-old 10a2308ffb8c 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/14 07:22 net-old 70701b83e208 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/14 06:59 net-old 70701b83e208 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/14 00:56 net-old 70701b83e208 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/13 15:42 net-old 66f4beaa6c1d 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/13 02:44 net-old 5833291ab6de 83f5c9b5 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/12 08:46 net-old 5833291ab6de 75b04091 .config console log report info ci-upstream-net-this-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/23 02:12 net-next-old 6d872df3e3b9 545ab074 .config console log report info ci-upstream-net-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/17 01:55 net-next-old 62803fec52f8 cafff8b6 .config console log report info ci-upstream-net-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/14 11:35 net-next-old 66f4beaa6c1d 83f5c9b5 .config console log report info ci-upstream-net-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/13 02:15 net-next-old 5833291ab6de 83f5c9b5 .config console log report info ci-upstream-net-kasan-gce general protection fault in nldev_stat_set_doit
2021/11/10 21:10 linux-next 73e5c18006f5 75b04091 .config console log report info ci-upstream-linux-next-kasan-gce-root general protection fault in nldev_stat_set_doit
* Struck through repros no longer work on HEAD.