All of lore.kernel.org
 help / color / mirror / Atom feed
* KMSAN: uninit-value in ip_route_output_key_hash_rcu (4)
@ 2021-01-13 20:47 syzbot
  0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2021-01-13 20:47 UTC (permalink / raw)
  To: davem, glider, kuba, kuznet, linux-kernel, netdev,
	syzkaller-bugs, yoshfuji

Hello,

syzbot found the following issue on:

HEAD commit:    73d62e81 kmsan: random: prevent boot-time reports in _mix_..
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=10998e93500000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2cdf4151c9653e32
dashboard link: https://syzkaller.appspot.com/bug?extid=549e451574ba8bfd0fd6
compiler:       clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+549e451574ba8bfd0fd6@syzkaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in ip_route_output_key_hash_rcu+0xe77/0x1f20 net/ipv4/route.c:2588
CPU: 1 PID: 8547 Comm: syz-executor.0 Not tainted 5.10.0-rc4-syzkaller #0
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+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:118
 __msan_warning+0x5f/0xa0 mm/kmsan/kmsan_instr.c:197
 ip_route_output_key_hash_rcu+0xe77/0x1f20 net/ipv4/route.c:2588
 ip_route_output_key_hash+0x21b/0x2d0 net/ipv4/route.c:2507
 __ip_route_output_key include/net/route.h:126 [inline]
 xfrmi_xmit+0x4cb/0x1fd0 net/xfrm/xfrm_interface.c:376
 __netdev_start_xmit include/linux/netdevice.h:4718 [inline]
 netdev_start_xmit include/linux/netdevice.h:4732 [inline]
 xmit_one+0x2b9/0x770 net/core/dev.c:3564
 dev_hard_start_xmit net/core/dev.c:3580 [inline]
 __dev_queue_xmit+0x33f2/0x4520 net/core/dev.c:4140
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4173
 packet_snd net/packet/af_packet.c:2992 [inline]
 packet_sendmsg+0x86f9/0x99d0 net/packet/af_packet.c:3017
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmmsg+0xa56/0x1060 net/socket.c:2497
 __do_sys_sendmmsg net/socket.c:2526 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2523
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2523
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f2026f42c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e219
RDX: 0000000000000001 RSI: 00000000200066c0 RDI: 0000000000000003
RBP: 000000000119c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00000000016afb5f R14: 00007f2026f439c0 R15: 000000000119c034

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:289
 __msan_chain_origin+0x57/0xa0 mm/kmsan/kmsan_instr.c:147
 decode_session4 net/xfrm/xfrm_policy.c:3285 [inline]
 __xfrm_decode_session+0x15d5/0x3890 net/xfrm/xfrm_policy.c:3481
 xfrm_decode_session include/net/xfrm.h:1137 [inline]
 xfrmi_xmit+0x243/0x1fd0 net/xfrm/xfrm_interface.c:369
 __netdev_start_xmit include/linux/netdevice.h:4718 [inline]
 netdev_start_xmit include/linux/netdevice.h:4732 [inline]
 xmit_one+0x2b9/0x770 net/core/dev.c:3564
 dev_hard_start_xmit net/core/dev.c:3580 [inline]
 __dev_queue_xmit+0x33f2/0x4520 net/core/dev.c:4140
 dev_queue_xmit+0x4b/0x60 net/core/dev.c:4173
 packet_snd net/packet/af_packet.c:2992 [inline]
 packet_sendmsg+0x86f9/0x99d0 net/packet/af_packet.c:3017
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmmsg+0xa56/0x1060 net/socket.c:2497
 __do_sys_sendmmsg net/socket.c:2526 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2523
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2523
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:121 [inline]
 kmsan_internal_poison_shadow+0x5c/0xf0 mm/kmsan/kmsan.c:104
 kmsan_slab_alloc+0x8d/0xe0 mm/kmsan/kmsan_hooks.c:76
 slab_alloc_node mm/slub.c:2906 [inline]
 __kmalloc_node_track_caller+0xc61/0x15f0 mm/slub.c:4512
 __kmalloc_reserve net/core/skbuff.c:142 [inline]
 __alloc_skb+0x309/0xae0 net/core/skbuff.c:210
 alloc_skb include/linux/skbuff.h:1094 [inline]
 alloc_skb_with_frags+0x1f3/0xc20 net/core/skbuff.c:5832
 sock_alloc_send_pskb+0xc73/0xe40 net/core/sock.c:2329
 packet_alloc_skb net/packet/af_packet.c:2840 [inline]
 packet_snd net/packet/af_packet.c:2935 [inline]
 packet_sendmsg+0x6aa3/0x99d0 net/packet/af_packet.c:3017
 sock_sendmsg_nosec net/socket.c:651 [inline]
 sock_sendmsg net/socket.c:671 [inline]
 ____sys_sendmsg+0xc7a/0x1240 net/socket.c:2353
 ___sys_sendmsg net/socket.c:2407 [inline]
 __sys_sendmmsg+0xa56/0x1060 net/socket.c:2497
 __do_sys_sendmmsg net/socket.c:2526 [inline]
 __se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2523
 __x64_sys_sendmmsg+0x56/0x70 net/socket.c:2523
 do_syscall_64+0x9f/0x140 arch/x86/entry/common.c:48
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: KMSAN: uninit-value in ip_route_output_key_hash_rcu (4)
  2023-12-07 13:36 xingwei lee
@ 2023-12-07 14:20 ` Eric Dumazet
  0 siblings, 0 replies; 3+ messages in thread
From: Eric Dumazet @ 2023-12-07 14:20 UTC (permalink / raw)
  To: xingwei lee
  Cc: syzbot+549e451574ba8bfd0fd6, davem, glider, kuba,
	Alexey Kuznetsov, linux-kernel, netdev, syzkaller-bugs, yoshfuji

On Thu, Dec 7, 2023 at 2:36 PM xingwei lee <xrivendell7@gmail.com> wrote:
>
> Hello
>
> I reproduced this bug in the latest upstream linux with repro.c and repro.txt
>
> When fuzzing the latest upstream linux 6.7-rc4,  the following crash
> was triggered.
> HEAD commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
>
> If you fix this issue, please add the following tag to the commit:
> Reported-by: xingwei Lee <xrivendell7@gmail.com>
>
> console_log: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-console_log
> report: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-report
> kernel commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
> kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=ce27066613dacbb6
> repro.c: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-repro-c
> repro.txt: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-repro-txt
>
> In the lasted kernel: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 the
> crash likes below:
> [  209.523497][ T8593] =====================================================
> [  209.530316][ T8593] BUG: KMSAN: uninit-value in
> ip_route_output_key_hash_rcu+0x1ee8/0x3810
> [  209.533357][ T8593]  ip_route_output_key_hash_rcu+0x1ee8/0x3810
> [  209.535524][ T8593]  ip_route_output_flow+0x14f/0x320
> [  209.537312][ T8593]  ip_tunnel_xmit+0x1450/0x3e80
> [  209.538995][ T8593]  ipgre_xmit+0xd1c/0xe20
> [  209.540511][ T8593]  dev_hard_start_xmit+0x247/0xa10
> [  209.542211][ T8593]  __dev_queue_xmit+0x33b8/0x5130
> [  209.543742][ T8593]  __bpf_redirect+0xdd7/0x1600
> [  209.545235][ T8593]  bpf_clone_redirect+0x328/0x470
> [  209.546807][ T8593]  ___bpf_prog_run+0x2180/0xdb80
> [  209.548288][ T8593]  __bpf_prog_run512+0xb5/0xe0
> [  209.549864][ T8593]  bpf_test_run+0x482/0xb00
> [  209.551178][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
> [  209.552612][ T8593]  bpf_prog_test_run+0x6af/0xac0
> [  209.553902][ T8593]  __sys_bpf+0x649/0xd60
> [  209.555000][ T8593]  __x64_sys_bpf+0xa0/0xe0
> [  209.556114][ T8593]  do_syscall_64+0x44/0x110
> [  209.557249][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
> [  209.558676][ T8593]
> [  209.559232][ T8593] Uninit was stored to memory at:
> [  209.560528][ T8593]  ip_tunnel_xmit+0x1161/0x3e80
> [  209.561676][ T8593]  ipgre_xmit+0xd1c/0xe20
> [  209.562711][ T8593]  dev_hard_start_xmit+0x247/0xa10
> [  209.563864][ T8593]  __dev_queue_xmit+0x33b8/0x5130
> [  209.564963][ T8593]  __bpf_redirect+0xdd7/0x1600
> [  209.566044][ T8593]  bpf_clone_redirect+0x328/0x470
> [  209.567151][ T8593]  ___bpf_prog_run+0x2180/0xdb80
> [  209.568184][ T8593]  __bpf_prog_run512+0xb5/0xe0
> [  209.569187][ T8593]  bpf_test_run+0x482/0xb00
> [  209.570201][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
> [  209.571308][ T8593]  bpf_prog_test_run+0x6af/0xac0
> [  209.572284][ T8593]  __sys_bpf+0x649/0xd60
> [  209.573131][ T8593]  __x64_sys_bpf+0xa0/0xe0
> [  209.574010][ T8593]  do_syscall_64+0x44/0x110
> [  209.574902][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
> [  209.576008][ T8593]
> [  209.576456][ T8593] Uninit was created at:
> [  209.577301][ T8593]  slab_post_alloc_hook+0x129/0xa70
> [  209.578284][ T8593]  kmem_cache_alloc_node+0x5e9/0xb10
> [  209.579233][ T8593]  kmalloc_reserve+0x13d/0x4a0
> [  209.580177][ T8593]  pskb_expand_head+0x226/0x1a00
> [  209.581096][ T8593]  skb_ensure_writable+0x3d3/0x460
> [  209.582015][ T8593]  bpf_clone_redirect+0x17f/0x470
> [  209.582963][ T8593]  ___bpf_prog_run+0x2180/0xdb80
> [  209.583859][ T8593]  __bpf_prog_run512+0xb5/0xe0
> [  209.584725][ T8593]  bpf_test_run+0x482/0xb00
> [  209.585556][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
> [  209.586527][ T8593]  bpf_prog_test_run+0x6af/0xac0
> [  209.587347][ T8593]  __sys_bpf+0x649/0xd60
> [  209.588058][ T8593]  __x64_sys_bpf+0xa0/0xe0
> [  209.588802][ T8593]  do_syscall_64+0x44/0x110
> [  209.589613][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b

Please double check the latest net tree.

^ permalink raw reply	[flat|nested] 3+ messages in thread
* Re: KMSAN: uninit-value in ip_route_output_key_hash_rcu (4)
@ 2023-12-07 13:36 xingwei lee
  2023-12-07 14:20 ` Eric Dumazet
  0 siblings, 1 reply; 3+ messages in thread
From: xingwei lee @ 2023-12-07 13:36 UTC (permalink / raw)
  To: syzbot+549e451574ba8bfd0fd6
  Cc: davem, glider, kuba, Alexey Kuznetsov, linux-kernel, netdev,
	syzkaller-bugs, yoshfuji, Eric Dumazet

Hello

I reproduced this bug in the latest upstream linux with repro.c and repro.txt

When fuzzing the latest upstream linux 6.7-rc4,  the following crash
was triggered.
HEAD commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8

If you fix this issue, please add the following tag to the commit:
Reported-by: xingwei Lee <xrivendell7@gmail.com>

console_log: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-console_log
report: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-report
kernel commit: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8
kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=ce27066613dacbb6
repro.c: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-repro-c
repro.txt: https://gist.github.com/xrivendell7/195eb3c1946ea466f9d8f5977b90c6ed#file-repro-txt

In the lasted kernel: bee0e7762ad2c6025b9f5245c040fcc36ef2bde8 the
crash likes below:
[  209.523497][ T8593] =====================================================
[  209.530316][ T8593] BUG: KMSAN: uninit-value in
ip_route_output_key_hash_rcu+0x1ee8/0x3810
[  209.533357][ T8593]  ip_route_output_key_hash_rcu+0x1ee8/0x3810
[  209.535524][ T8593]  ip_route_output_flow+0x14f/0x320
[  209.537312][ T8593]  ip_tunnel_xmit+0x1450/0x3e80
[  209.538995][ T8593]  ipgre_xmit+0xd1c/0xe20
[  209.540511][ T8593]  dev_hard_start_xmit+0x247/0xa10
[  209.542211][ T8593]  __dev_queue_xmit+0x33b8/0x5130
[  209.543742][ T8593]  __bpf_redirect+0xdd7/0x1600
[  209.545235][ T8593]  bpf_clone_redirect+0x328/0x470
[  209.546807][ T8593]  ___bpf_prog_run+0x2180/0xdb80
[  209.548288][ T8593]  __bpf_prog_run512+0xb5/0xe0
[  209.549864][ T8593]  bpf_test_run+0x482/0xb00
[  209.551178][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
[  209.552612][ T8593]  bpf_prog_test_run+0x6af/0xac0
[  209.553902][ T8593]  __sys_bpf+0x649/0xd60
[  209.555000][ T8593]  __x64_sys_bpf+0xa0/0xe0
[  209.556114][ T8593]  do_syscall_64+0x44/0x110
[  209.557249][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
[  209.558676][ T8593]
[  209.559232][ T8593] Uninit was stored to memory at:
[  209.560528][ T8593]  ip_tunnel_xmit+0x1161/0x3e80
[  209.561676][ T8593]  ipgre_xmit+0xd1c/0xe20
[  209.562711][ T8593]  dev_hard_start_xmit+0x247/0xa10
[  209.563864][ T8593]  __dev_queue_xmit+0x33b8/0x5130
[  209.564963][ T8593]  __bpf_redirect+0xdd7/0x1600
[  209.566044][ T8593]  bpf_clone_redirect+0x328/0x470
[  209.567151][ T8593]  ___bpf_prog_run+0x2180/0xdb80
[  209.568184][ T8593]  __bpf_prog_run512+0xb5/0xe0
[  209.569187][ T8593]  bpf_test_run+0x482/0xb00
[  209.570201][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
[  209.571308][ T8593]  bpf_prog_test_run+0x6af/0xac0
[  209.572284][ T8593]  __sys_bpf+0x649/0xd60
[  209.573131][ T8593]  __x64_sys_bpf+0xa0/0xe0
[  209.574010][ T8593]  do_syscall_64+0x44/0x110
[  209.574902][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b
[  209.576008][ T8593]
[  209.576456][ T8593] Uninit was created at:
[  209.577301][ T8593]  slab_post_alloc_hook+0x129/0xa70
[  209.578284][ T8593]  kmem_cache_alloc_node+0x5e9/0xb10
[  209.579233][ T8593]  kmalloc_reserve+0x13d/0x4a0
[  209.580177][ T8593]  pskb_expand_head+0x226/0x1a00
[  209.581096][ T8593]  skb_ensure_writable+0x3d3/0x460
[  209.582015][ T8593]  bpf_clone_redirect+0x17f/0x470
[  209.582963][ T8593]  ___bpf_prog_run+0x2180/0xdb80
[  209.583859][ T8593]  __bpf_prog_run512+0xb5/0xe0
[  209.584725][ T8593]  bpf_test_run+0x482/0xb00
[  209.585556][ T8593]  bpf_prog_test_run_skb+0x14e5/0x1f20
[  209.586527][ T8593]  bpf_prog_test_run+0x6af/0xac0
[  209.587347][ T8593]  __sys_bpf+0x649/0xd60
[  209.588058][ T8593]  __x64_sys_bpf+0xa0/0xe0
[  209.588802][ T8593]  do_syscall_64+0x44/0x110
[  209.589613][ T8593]  entry_SYSCALL_64_after_hwframe+0x63/0x6b

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-12-07 14:24 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-01-13 20:47 KMSAN: uninit-value in ip_route_output_key_hash_rcu (4) syzbot
2023-12-07 13:36 xingwei lee
2023-12-07 14:20 ` Eric Dumazet

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.