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Subject[syzbot] KASAN: use-after-free Read in nf_confirm
From
Hello,

syzbot found the following issue on:

HEAD commit: d887ae3247e0 octeontx2-pf: Remove unnecessary synchronize_..
git tree: net-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17f2b659f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b1aab282dc5dd920
dashboard link: https://syzkaller.appspot.com/bug?extid=793a590957d9c1b96620
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1313dce6f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=169eb59ef00000

The issue was bisected to:

commit 1397af5bfd7d32b0cf2adb70a78c9a9e8f11d912
Author: Florian Westphal <fw@strlen.de>
Date: Mon Apr 11 11:01:18 2022 +0000

netfilter: conntrack: remove the percpu dying list

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13a8d006f00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=1068d006f00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17a8d006f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+793a590957d9c1b96620@syzkaller.appspotmail.com
Fixes: 1397af5bfd7d ("netfilter: conntrack: remove the percpu dying list")

==================================================================
BUG: KASAN: use-after-free in __nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline]
BUG: KASAN: use-after-free in nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline]
BUG: KASAN: use-after-free in nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline]
BUG: KASAN: use-after-free in nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
BUG: KASAN: use-after-free in nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154
Read of size 1 at addr ffff88801b035304 by task kworker/1:0/22

CPU: 1 PID: 22 Comm: kworker/1:0 Not tainted 5.18.0-rc6-syzkaller-01525-gd887ae3247e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_peer_keepalive_worker
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
__nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:47 [inline]
nf_ct_ext_exist include/net/netfilter/nf_conntrack_extend.h:52 [inline]
nf_ct_ecache_exist include/net/netfilter/nf_conntrack_ecache.h:42 [inline]
nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:63 [inline]
nf_confirm+0x575/0x5b0 net/netfilter/nf_conntrack_proto.c:154
ipv4_confirm+0x17a/0x390 net/netfilter/nf_conntrack_proto.c:182
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620
nf_hook+0x1cb/0x5b0 include/linux/netfilter.h:262
NF_HOOK_COND include/linux/netfilter.h:295 [inline]
ip_output+0x21f/0x310 net/ipv4/ip_output.c:430
dst_output include/net/dst.h:451 [inline]
ip_local_out net/ipv4/ip_output.c:126 [inline]
ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1571
udp_send_skb+0x6c8/0x11a0 net/ipv4/udp.c:967
udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254
inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:734
rxrpc_send_keepalive+0x1f6/0x370 net/rxrpc/output.c:665
rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:332 [inline]
rxrpc_peer_keepalive_worker+0x7cf/0xc20 net/rxrpc/peer_event.c:396
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>

Allocated by task 2972:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
____kasan_kmalloc mm/kasan/common.c:515 [inline]
____kasan_kmalloc mm/kasan/common.c:474 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524
kmalloc include/linux/slab.h:581 [inline]
kernfs_get_open_node fs/kernfs/file.c:547 [inline]
kernfs_fop_open+0xa3f/0xe00 fs/kernfs/file.c:693
do_dentry_open+0x4a1/0x11e0 fs/open.c:824
do_open fs/namei.c:3476 [inline]
path_openat+0x1c71/0x2910 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
do_sys_open fs/open.c:1229 [inline]
__do_sys_openat fs/open.c:1245 [inline]
__se_sys_openat fs/open.c:1240 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1240
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

Freed by task 22:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
slab_free mm/slub.c:3510 [inline]
kfree+0xd6/0x4d0 mm/slub.c:4552
nf_conntrack_free+0x100/0x630 net/netfilter/nf_conntrack_core.c:1680
nf_ct_destroy+0x1be/0x320 net/netfilter/nf_conntrack_core.c:610
nf_ct_put include/net/netfilter/nf_conntrack.h:184 [inline]
nf_ct_put include/net/netfilter/nf_conntrack.h:181 [inline]
__nf_ct_resolve_clash+0x624/0x785 net/netfilter/nf_conntrack_core.c:1013
nf_ct_resolve_clash+0x14a/0xa23 net/netfilter/nf_conntrack_core.c:1136
__nf_conntrack_confirm.cold+0x16/0x23e net/netfilter/nf_conntrack_core.c:1284
nf_conntrack_confirm include/net/netfilter/nf_conntrack_core.h:62 [inline]
nf_confirm+0x4ce/0x5b0 net/netfilter/nf_conntrack_proto.c:154
ipv4_confirm+0x17a/0x390 net/netfilter/nf_conntrack_proto.c:182
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xc5/0x1f0 net/netfilter/core.c:620
nf_hook+0x1cb/0x5b0 include/linux/netfilter.h:262
NF_HOOK_COND include/linux/netfilter.h:295 [inline]
ip_output+0x21f/0x310 net/ipv4/ip_output.c:430
dst_output include/net/dst.h:451 [inline]
ip_local_out net/ipv4/ip_output.c:126 [inline]
ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1571
udp_send_skb+0x6c8/0x11a0 net/ipv4/udp.c:967
udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254
inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:734
rxrpc_send_keepalive+0x1f6/0x370 net/rxrpc/output.c:665
rxrpc_peer_keepalive_dispatch net/rxrpc/peer_event.c:332 [inline]
rxrpc_peer_keepalive_worker+0x7cf/0xc20 net/rxrpc/peer_event.c:396
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff88801b035300
which belongs to the cache kmalloc-128 of size 128
The buggy address is located 4 bytes inside of
128-byte region [ffff88801b035300, ffff88801b035380)

The buggy address belongs to the physical page:
page:ffffea00006c0d40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b035
flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000200 ffffea0000664000 dead000000000005 ffff888010c418c0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 2967, tgid 2967 (udevd), ts 23818493455, free_ts 23818009574
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272
alloc_slab_page mm/slub.c:1799 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1944
new_slab mm/slub.c:2004 [inline]
___slab_alloc+0x8df/0xf20 mm/slub.c:3005
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
slab_alloc_node mm/slub.c:3183 [inline]
slab_alloc mm/slub.c:3225 [inline]
kmem_cache_alloc_trace+0x310/0x3f0 mm/slub.c:3256
kmalloc include/linux/slab.h:581 [inline]
kernfs_get_open_node fs/kernfs/file.c:547 [inline]
kernfs_fop_open+0xa3f/0xe00 fs/kernfs/file.c:693
do_dentry_open+0x4a1/0x11e0 fs/open.c:824
do_open fs/namei.c:3476 [inline]
path_openat+0x1c71/0x2910 fs/namei.c:3609
do_filp_open+0x1aa/0x400 fs/namei.c:3636
do_sys_openat2+0x16d/0x4c0 fs/open.c:1213
do_sys_open fs/open.c:1229 [inline]
__do_sys_openat fs/open.c:1245 [inline]
__se_sys_openat fs/open.c:1240 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1240
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
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
__unfreeze_partials+0x17c/0x1a0 mm/slub.c:2523
qlink_free mm/kasan/quarantine.c:157 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc_node mm/slub.c:3217 [inline]
kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3267
__alloc_skb+0x215/0x340 net/core/skbuff.c:414
alloc_skb include/linux/skbuff.h:1426 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1191 [inline]
netlink_sendmsg+0x9a2/0xe10 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:734
____sys_sendmsg+0x6eb/0x810 net/socket.c:2460
___sys_sendmsg+0xf3/0x170 net/socket.c:2514
__sys_sendmsg net/socket.c:2543 [inline]
__do_sys_sendmsg net/socket.c:2552 [inline]
__se_sys_sendmsg net/socket.c:2550 [inline]
__x64_sys_sendmsg+0x132/0x220 net/socket.c:2550
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

Memory state around the buggy address:
ffff88801b035200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801b035280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801b035300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801b035380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801b035400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================


---
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.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

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