syzbot

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BUG: KASAN: slab-out-of-bounds in xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853
Read of size 1 at addr ffff88810cebbbf8 by task syz-executor363/295

CPU: 0 PID: 295 Comm: syz-executor363 Not tainted 5.15.176-syzkaller-00066-gd1a25a6a4b3b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x151/0x1c0 lib/dump_stack.c:106
 print_address_description+0x87/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:444
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 xfrm_policy_inexact_list_reinsert+0x5b0/0x660 net/xfrm/xfrm_policy.c:853
 xfrm_policy_inexact_node_merge net/xfrm/xfrm_policy.c:985 [inline]
 xfrm_policy_inexact_insert_node+0x917/0xb00 net/xfrm/xfrm_policy.c:1041
 xfrm_policy_inexact_alloc_chain+0x4ec/0xaf0 net/xfrm/xfrm_policy.c:1157
 xfrm_policy_inexact_insert+0x6a/0x1160 net/xfrm/xfrm_policy.c:1200
 xfrm_policy_insert+0xe7/0x940 net/xfrm/xfrm_policy.c:1583
 xfrm_add_policy+0x4f2/0x980 net/xfrm/xfrm_user.c:1832
 xfrm_user_rcv_msg+0x4f3/0x7d0 net/xfrm/xfrm_user.c:2981
 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2493
 xfrm_netlink_rcv+0x72/0x90 net/xfrm/xfrm_user.c:3003
 netlink_unicast_kernel net/netlink/af_netlink.c:1315 [inline]
 netlink_unicast+0x8df/0xac0 net/netlink/af_netlink.c:1341
 netlink_sendmsg+0xa0a/0xd20 net/netlink/af_netlink.c:1909
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2436
 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2490
 __sys_sendmsg net/socket.c:2519 [inline]
 __do_sys_sendmsg net/socket.c:2528 [inline]
 __se_sys_sendmsg+0x19a/0x260 net/socket.c:2526
 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2526
 x64_sys_call+0x16a/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f4209256be9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeb0d19f38 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ffeb0d1a108 RCX: 00007f4209256be9
RDX: 0000000000004000 RSI: 0000000020000580 RDI: 0000000000000005
RBP: 00007f42092ca610 R08: 00007ffeb0d1a108 R09: 00007ffeb0d1a108
R10: 000000000000000a R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffeb0d1a0f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Allocated by task 295:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc+0xdb/0x110 mm/kasan/common.c:512
 __kasan_kmalloc+0x9/0x10 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13f/0x2c0 mm/slub.c:4431
 kmalloc include/linux/slab.h:608 [inline]
 sk_prot_alloc+0xf9/0x330 net/core/sock.c:1868
 sk_alloc+0x38/0x430 net/core/sock.c:1925
 pfkey_create+0x12c/0x620 net/key/af_key.c:152
 __sock_create+0x3be/0x7e0 net/socket.c:1486
 sock_create net/socket.c:1542 [inline]
 __sys_socket+0x132/0x370 net/socket.c:1584
 __do_sys_socket net/socket.c:1593 [inline]
 __se_sys_socket net/socket.c:1591 [inline]
 __x64_sys_socket+0x7a/0x90 net/socket.c:1591
 x64_sys_call+0x147/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:42
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

The buggy address belongs to the object at ffff88810cebb800
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 1016 bytes inside of
 1024-byte region [ffff88810cebb800, ffff88810cebbc00)
The buggy address belongs to the page:
page:ffffea000433ae00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x10ceb8
head:ffffea000433ae00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100043080
raw: 0000000000000000 0000000000100010 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 290, ts 23590308762, free_ts 23579499269
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2605
 prep_new_page+0x1b/0x110 mm/page_alloc.c:2611
 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4485
 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5780
 allocate_slab mm/slub.c:1932 [inline]
 new_slab+0x9a/0x4e0 mm/slub.c:1995
 ___slab_alloc+0x39e/0x830 mm/slub.c:3028
 __slab_alloc+0x4a/0x90 mm/slub.c:3115
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 __kmalloc_track_caller+0x171/0x2c0 mm/slub.c:4949
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x10c/0x550 net/core/skbuff.c:428
 alloc_skb_fclone include/linux/skbuff.h:1233 [inline]
 sk_stream_alloc_skb+0x1f8/0xad0 net/ipv4/tcp.c:889
 tcp_sendmsg_locked+0xd34/0x3a90 net/ipv4/tcp.c:1314
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1457
 inet_sendmsg+0xa1/0xc0 net/ipv4/af_inet.c:830
 sock_sendmsg_nosec net/socket.c:704 [inline]
 __sock_sendmsg net/socket.c:716 [inline]
 sock_write_iter+0x39b/0x530 net/socket.c:1079
 call_write_iter include/linux/fs.h:2206 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0xd5d/0x1110 fs/read_write.c:594
 ksys_write+0x199/0x2c0 fs/read_write.c:647
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1472 [inline]
 free_pcp_prepare mm/page_alloc.c:1544 [inline]
 free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3534
 free_unref_page+0xe8/0x750 mm/page_alloc.c:3616
 free_the_page mm/page_alloc.c:805 [inline]
 __free_pages+0x61/0xf0 mm/page_alloc.c:5856
 __free_slab+0xec/0x1d0 mm/slub.c:2020
 free_slab mm/slub.c:2035 [inline]
 discard_slab mm/slub.c:2041 [inline]
 __unfreeze_partials+0x165/0x1a0 mm/slub.c:2527
 put_cpu_partial+0xc4/0x120 mm/slub.c:2607
 __slab_free+0x1c8/0x290 mm/slub.c:3390
 do_slab_free mm/slub.c:3509 [inline]
 ___cache_free+0x109/0x120 mm/slub.c:3530
 qlink_free+0x4d/0x90 mm/kasan/quarantine.c:157
 qlist_free_all+0x44/0xb0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x15a/0x180 mm/kasan/quarantine.c:283
 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:443
 kasan_slab_alloc include/linux/kasan.h:217 [inline]
 slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:550
 slab_alloc_node mm/slub.c:3240 [inline]
 slab_alloc mm/slub.c:3250 [inline]
 kmem_cache_alloc+0xf5/0x250 mm/slub.c:3255
 kmem_cache_alloc_node include/linux/slab.h:474 [inline]
 __alloc_skb+0xbe/0x550 net/core/skbuff.c:416
 alloc_skb_fclone include/linux/skbuff.h:1233 [inline]
 sk_stream_alloc_skb+0x1f8/0xad0 net/ipv4/tcp.c:889

Memory state around the buggy address:
 ffff88810cebba80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88810cebbb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88810cebbb80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
                                                                ^
 ffff88810cebbc00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88810cebbc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
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