[syzbot] KASAN: use-after-free Write in l2tp_tunnel_del_work
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syzbot
Dec 7, 2021, 2:47:25 AM12/7/21
to da...@davemloft.net, ku...@kernel.org, linux-...@vger.kernel.org, msch...@universe-factory.net, net...@vger.kernel.org, rdu...@infradead.org, sis...@purdue.edu, syzkall...@googlegroups.com, tanxi...@gmail.com, unixb...@gmail.com, xion...@fudan.edu.cn, xiyuy...@fudan.edu.cn
Hello,
syzbot found the following issue on:
HEAD commit: 58e1100fdc59 MAINTAINERS: co-maintain random.c
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=155b1475b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5b0eee8ab3ea1839
dashboard link: https://syzkaller.appspot.com/bug?extid=3614588f9652203dccaa
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
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+361458...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
BUG: KASAN: use-after-free in l2tp_session_delete net/l2tp/l2tp_core.c:1549 [inline]
BUG: KASAN: use-after-free in l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1207 [inline]
BUG: KASAN: use-after-free in l2tp_tunnel_del_work+0x25c/0x9c0 net/l2tp/l2tp_core.c:1239
Write of size 8 at addr ffff88807e603808 by task kworker/u4:3/54
CPU: 0 PID: 54 Comm: kworker/u4:3 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: l2tp l2tp_tunnel_del_work
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+0x8d/0x320 mm/kasan/report.c:247
__kasan_report mm/kasan/report.c:433 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
l2tp_session_delete net/l2tp/l2tp_core.c:1549 [inline]
l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1207 [inline]
l2tp_tunnel_del_work+0x25c/0x9c0 net/l2tp/l2tp_core.c:1239
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Allocated by task 14071:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:595 [inline]
kzalloc include/linux/slab.h:724 [inline]
l2tp_session_create+0x36/0xa90 net/l2tp/l2tp_core.c:1585
pppol2tp_connect+0xffb/0x1a00 net/l2tp/l2tp_ppp.c:772
__sys_connect_file+0x155/0x1a0 net/socket.c:1896
__sys_connect+0x161/0x190 net/socket.c:1913
__do_sys_connect net/socket.c:1923 [inline]
__se_sys_connect net/socket.c:1920 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1920
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 2973:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xf6/0x560 mm/slub.c:4561
l2tp_session_free net/l2tp/l2tp_core.c:163 [inline]
l2tp_session_dec_refcount+0x126/0x300 net/l2tp/l2tp_core.c:200
pppol2tp_session_destruct+0xba/0xf0 net/l2tp/l2tp_ppp.c:419
__sk_destruct+0x4b/0x900 net/core/sock.c:2012
sk_destruct+0xbd/0xe0 net/core/sock.c:2057
__sk_free+0xef/0x3d0 net/core/sock.c:2068
sk_free+0x78/0xa0 net/core/sock.c:2079
sock_put include/net/sock.h:1878 [inline]
pppol2tp_put_sk+0x9b/0xd0 net/l2tp/l2tp_ppp.c:402
rcu_do_batch kernel/rcu/tree.c:2506 [inline]
rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2741
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
Last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2985 [inline]
call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065
pppol2tp_release+0x311/0x560 net/l2tp/l2tp_ppp.c:458
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1314
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
Second to last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348
kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3550
neigh_destroy+0x419/0x620 net/core/neighbour.c:889
neigh_release include/net/neighbour.h:437 [inline]
neigh_cleanup_and_release+0x1fd/0x340 net/core/neighbour.c:103
neigh_del net/core/neighbour.c:225 [inline]
neigh_remove_one+0x37d/0x460 net/core/neighbour.c:246
neigh_forced_gc net/core/neighbour.c:276 [inline]
neigh_alloc net/core/neighbour.c:423 [inline]
___neigh_create+0x189b/0x2970 net/core/neighbour.c:618
ip6_finish_output2+0xf84/0x14e0 net/ipv6/ip6_output.c:123
__ip6_finish_output net/ipv6/ip6_output.c:191 [inline]
__ip6_finish_output+0x4c1/0x1050 net/ipv6/ip6_output.c:170
ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0xa99/0x17f0 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
addrconf_dad_completed+0x397/0xd60 net/ipv6/addrconf.c:4216
addrconf_dad_work+0x79f/0x1340 net/ipv6/addrconf.c:4126
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88807e603800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 8 bytes inside of
1024-byte region [ffff88807e603800, ffff88807e603c00)
The buggy address belongs to the page:
page:ffffea0001f98000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e600
head:ffffea0001f98000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001e78e00 dead000000000002 ffff888010c41dc0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6514, ts 155766229424, free_ts 155712464037
prep_new_page mm/page_alloc.c:2418 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191
alloc_slab_page mm/slub.c:1793 [inline]
allocate_slab mm/slub.c:1930 [inline]
new_slab+0x32d/0x4a0 mm/slub.c:1993
___slab_alloc+0x918/0xfe0 mm/slub.c:3022
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
__kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4956
kmalloc_reserve net/core/skbuff.c:354 [inline]
__alloc_skb+0xde/0x340 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1126 [inline]
__tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3930
__tcp_send_ack net/ipv4/tcp_output.c:3962 [inline]
tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3962
tcp_cleanup_rbuf+0x464/0x5a0 net/ipv4/tcp.c:1580
tcp_recvmsg_locked+0x7a2/0x20d0 net/ipv4/tcp.c:2504
tcp_recvmsg+0x12b/0x550 net/ipv4/tcp.c:2534
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1035
call_read_iter include/linux/fs.h:2156 [inline]
new_sync_read+0x5ba/0x6e0 fs/read_write.c:400
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3309 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3388
__put_page+0x27a/0x470 mm/swap.c:128
folio_put include/linux/mm.h:1237 [inline]
put_page include/linux/mm.h:1255 [inline]
__skb_frag_unref include/linux/skbuff.h:3144 [inline]
skb_release_data+0x49d/0x790 net/core/skbuff.c:672
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb+0x46/0x60 net/core/skbuff.c:756
sk_eat_skb include/net/sock.h:2652 [inline]
tcp_recvmsg_locked+0x12e8/0x20d0 net/ipv4/tcp.c:2488
tcp_recvmsg+0x12b/0x550 net/ipv4/tcp.c:2534
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1035
call_read_iter include/linux/fs.h:2156 [inline]
new_sync_read+0x5ba/0x6e0 fs/read_write.c:400
vfs_read+0x35c/0x600 fs/read_write.c:481
ksys_read+0x1ee/0x250 fs/read_write.c:619
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:
ffff88807e603700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807e603780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807e603800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e603880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e603900: 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 syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 58e1100fdc59 MAINTAINERS: co-maintain random.c
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=155b1475b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5b0eee8ab3ea1839
dashboard link: https://syzkaller.appspot.com/bug?extid=3614588f9652203dccaa
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
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+361458...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: use-after-free in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
BUG: KASAN: use-after-free in l2tp_session_delete net/l2tp/l2tp_core.c:1549 [inline]
BUG: KASAN: use-after-free in l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1207 [inline]
BUG: KASAN: use-after-free in l2tp_tunnel_del_work+0x25c/0x9c0 net/l2tp/l2tp_core.c:1239
Write of size 8 at addr ffff88807e603808 by task kworker/u4:3/54
CPU: 0 PID: 54 Comm: kworker/u4:3 Not tainted 5.16.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: l2tp l2tp_tunnel_del_work
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+0x8d/0x320 mm/kasan/report.c:247
__kasan_report mm/kasan/report.c:433 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
check_region_inline mm/kasan/generic.c:183 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189
instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
l2tp_session_delete net/l2tp/l2tp_core.c:1549 [inline]
l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1207 [inline]
l2tp_tunnel_del_work+0x25c/0x9c0 net/l2tp/l2tp_core.c:1239
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>
Allocated by task 14071:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:595 [inline]
kzalloc include/linux/slab.h:724 [inline]
l2tp_session_create+0x36/0xa90 net/l2tp/l2tp_core.c:1585
pppol2tp_connect+0xffb/0x1a00 net/l2tp/l2tp_ppp.c:772
__sys_connect_file+0x155/0x1a0 net/socket.c:1896
__sys_connect+0x161/0x190 net/socket.c:1913
__do_sys_connect net/socket.c:1923 [inline]
__se_sys_connect net/socket.c:1920 [inline]
__x64_sys_connect+0x6f/0xb0 net/socket.c:1920
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 2973:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0xff/0x130 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xf6/0x560 mm/slub.c:4561
l2tp_session_free net/l2tp/l2tp_core.c:163 [inline]
l2tp_session_dec_refcount+0x126/0x300 net/l2tp/l2tp_core.c:200
pppol2tp_session_destruct+0xba/0xf0 net/l2tp/l2tp_ppp.c:419
__sk_destruct+0x4b/0x900 net/core/sock.c:2012
sk_destruct+0xbd/0xe0 net/core/sock.c:2057
__sk_free+0xef/0x3d0 net/core/sock.c:2068
sk_free+0x78/0xa0 net/core/sock.c:2079
sock_put include/net/sock.h:1878 [inline]
pppol2tp_put_sk+0x9b/0xd0 net/l2tp/l2tp_ppp.c:402
rcu_do_batch kernel/rcu/tree.c:2506 [inline]
rcu_core+0x7ab/0x1470 kernel/rcu/tree.c:2741
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
Last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:2985 [inline]
call_rcu+0xb1/0x740 kernel/rcu/tree.c:3065
pppol2tp_release+0x311/0x560 net/l2tp/l2tp_ppp.c:458
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1314
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
tracehook_notify_resume include/linux/tracehook.h:189 [inline]
exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
Second to last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xf5/0x120 mm/kasan/generic.c:348
kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3550
neigh_destroy+0x419/0x620 net/core/neighbour.c:889
neigh_release include/net/neighbour.h:437 [inline]
neigh_cleanup_and_release+0x1fd/0x340 net/core/neighbour.c:103
neigh_del net/core/neighbour.c:225 [inline]
neigh_remove_one+0x37d/0x460 net/core/neighbour.c:246
neigh_forced_gc net/core/neighbour.c:276 [inline]
neigh_alloc net/core/neighbour.c:423 [inline]
___neigh_create+0x189b/0x2970 net/core/neighbour.c:618
ip6_finish_output2+0xf84/0x14e0 net/ipv6/ip6_output.c:123
__ip6_finish_output net/ipv6/ip6_output.c:191 [inline]
__ip6_finish_output+0x4c1/0x1050 net/ipv6/ip6_output.c:170
ip6_finish_output+0x32/0x200 net/ipv6/ip6_output.c:201
NF_HOOK_COND include/linux/netfilter.h:296 [inline]
ip6_output+0x1e4/0x530 net/ipv6/ip6_output.c:224
dst_output include/net/dst.h:450 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
ndisc_send_skb+0xa99/0x17f0 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x6f0 net/ipv6/ndisc.c:702
addrconf_dad_completed+0x397/0xd60 net/ipv6/addrconf.c:4216
addrconf_dad_work+0x79f/0x1340 net/ipv6/addrconf.c:4126
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88807e603800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 8 bytes inside of
1024-byte region [ffff88807e603800, ffff88807e603c00)
The buggy address belongs to the page:
page:ffffea0001f98000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e600
head:ffffea0001f98000 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001e78e00 dead000000000002 ffff888010c41dc0
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6514, ts 155766229424, free_ts 155712464037
prep_new_page mm/page_alloc.c:2418 [inline]
get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191
alloc_slab_page mm/slub.c:1793 [inline]
allocate_slab mm/slub.c:1930 [inline]
new_slab+0x32d/0x4a0 mm/slub.c:1993
___slab_alloc+0x918/0xfe0 mm/slub.c:3022
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
__kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4956
kmalloc_reserve net/core/skbuff.c:354 [inline]
__alloc_skb+0xde/0x340 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1126 [inline]
__tcp_send_ack.part.0+0x67/0x760 net/ipv4/tcp_output.c:3930
__tcp_send_ack net/ipv4/tcp_output.c:3962 [inline]
tcp_send_ack+0x7d/0xa0 net/ipv4/tcp_output.c:3962
tcp_cleanup_rbuf+0x464/0x5a0 net/ipv4/tcp.c:1580
tcp_recvmsg_locked+0x7a2/0x20d0 net/ipv4/tcp.c:2504
tcp_recvmsg+0x12b/0x550 net/ipv4/tcp.c:2534
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1035
call_read_iter include/linux/fs.h:2156 [inline]
new_sync_read+0x5ba/0x6e0 fs/read_write.c:400
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1338 [inline]
free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389
free_unref_page_prepare mm/page_alloc.c:3309 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3388
__put_page+0x27a/0x470 mm/swap.c:128
folio_put include/linux/mm.h:1237 [inline]
put_page include/linux/mm.h:1255 [inline]
__skb_frag_unref include/linux/skbuff.h:3144 [inline]
skb_release_data+0x49d/0x790 net/core/skbuff.c:672
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb+0x46/0x60 net/core/skbuff.c:756
sk_eat_skb include/net/sock.h:2652 [inline]
tcp_recvmsg_locked+0x12e8/0x20d0 net/ipv4/tcp.c:2488
tcp_recvmsg+0x12b/0x550 net/ipv4/tcp.c:2534
inet_recvmsg+0x11b/0x5e0 net/ipv4/af_inet.c:850
sock_recvmsg_nosec net/socket.c:944 [inline]
sock_recvmsg net/socket.c:962 [inline]
sock_recvmsg net/socket.c:958 [inline]
sock_read_iter+0x33c/0x470 net/socket.c:1035
call_read_iter include/linux/fs.h:2156 [inline]
new_sync_read+0x5ba/0x6e0 fs/read_write.c:400
vfs_read+0x35c/0x600 fs/read_write.c:481
ksys_read+0x1ee/0x250 fs/read_write.c:619
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:
ffff88807e603700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807e603780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807e603800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e603880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e603900: 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.
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syzbot
Apr 1, 2022, 3:17:14 PM4/1/22
to syzkall...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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