================================================================== BUG: KASAN: use-after-free in sk_psock_verdict_data_ready+0xc2/0x1a0 net/core/skmsg.c:1218 Read of size 8 at addr ffff88813d270820 by task syz.1.15861/12748 CPU: 1 PID: 12748 Comm: syz.1.15861 Tainted: G W 5.15.157-syzkaller-00896-g38761ec9fc9e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __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_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 sk_psock_verdict_data_ready+0xc2/0x1a0 net/core/skmsg.c:1218 unix_stream_sendmsg+0x8fd/0x1060 net/unix/af_unix.c:2111 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2431 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2485 __sys_sendmsg net/socket.c:2514 [inline] __do_sys_sendmsg net/socket.c:2523 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2521 __x64_sys_sendmsg+0x7b/0x90 net/socket.c:2521 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: 0033:0x7fccd8bf7eb9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fccd7875038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fccd8d93f80 RCX: 00007fccd8bf7eb9 RDX: 0000000000000800 RSI: 0000000020000500 RDI: 0000000000000007 RBP: 00007fccd8c6593e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fccd8d93f80 R15: 00007ffc842d8958 Allocated by task 12748: 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_slab_alloc+0xb1/0xe0 mm/kasan/common.c:466 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:3248 [inline] kmem_cache_alloc+0xf5/0x200 mm/slub.c:3253 sock_alloc_inode+0x1b/0xb0 net/socket.c:303 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:937 sock_alloc net/socket.c:626 [inline] __sock_create+0x135/0x760 net/socket.c:1450 sock_create net/socket.c:1537 [inline] __sys_socketpair+0x29f/0x6e0 net/socket.c:1637 __do_sys_socketpair net/socket.c:1690 [inline] __se_sys_socketpair net/socket.c:1687 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1687 x64_sys_call+0x19b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:54 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 Freed by task 12775: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:365 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373 kasan_slab_free include/linux/kasan.h:193 [inline] slab_free_hook mm/slub.c:1723 [inline] slab_free_freelist_hook+0xbd/0x190 mm/slub.c:1749 slab_free mm/slub.c:3519 [inline] kmem_cache_free+0x116/0x2e0 mm/slub.c:3535 sock_free_inode+0x20/0x30 net/socket.c:324 i_callback+0x4b/0x70 fs/inode.c:225 rcu_do_batch+0x57a/0xc10 kernel/rcu/tree.c:2523 rcu_core+0x517/0x1020 kernel/rcu/tree.c:2763 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2776 __do_softirq+0x26d/0x5bf kernel/softirq.c:565 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x135/0x1310 kernel/rcu/tree.c:3125 destroy_inode fs/inode.c:291 [inline] evict+0x5df/0x630 fs/inode.c:602 iput_final fs/inode.c:1705 [inline] iput+0x63b/0x7e0 fs/inode.c:1731 dentry_unlink_inode+0x34f/0x440 fs/dcache.c:376 __dentry_kill+0x447/0x660 fs/dcache.c:582 dentry_kill+0xc0/0x2a0 dput+0x45/0x80 fs/dcache.c:889 __fput+0x662/0x910 fs/file_table.c:288 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop+0xc4/0xe0 kernel/entry/common.c:181 exit_to_user_mode_prepare+0x5a/0xa0 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x26/0x160 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Second to last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xd3/0xf0 mm/kasan/generic.c:348 kasan_record_aux_stack_noalloc+0xb/0x10 mm/kasan/generic.c:358 __call_rcu_common kernel/rcu/tree.c:3007 [inline] call_rcu+0x135/0x1310 kernel/rcu/tree.c:3125 destroy_inode fs/inode.c:291 [inline] evict+0x5df/0x630 fs/inode.c:602 iput_final fs/inode.c:1705 [inline] iput+0x63b/0x7e0 fs/inode.c:1731 __sock_release net/socket.c:661 [inline] sock_release+0x110/0x140 net/socket.c:677 inet_ctl_sock_destroy include/net/inet_common.h:65 [inline] icmpv6_sk_exit+0x12c/0x210 net/ipv6/icmp.c:1045 ops_exit_list net/core/net_namespace.c:169 [inline] cleanup_net+0x64b/0xc00 net/core/net_namespace.c:596 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 The buggy address belongs to the object at ffff88813d270800 which belongs to the cache sock_inode_cache of size 896 The buggy address is located 32 bytes inside of 896-byte region [ffff88813d270800, ffff88813d270b80) The buggy address belongs to the page: page:ffffea0004f49c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13d270 head:ffffea0004f49c00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0x4000000000010200(slab|head|zone=1) raw: 4000000000010200 dead000000000100 dead000000000122 ffff8881081b2600 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Reclaimable, gfp_mask 0x1d20d0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 5249, ts 1680786024880, free_ts 1312427873534 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:5779 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:3248 [inline] kmem_cache_alloc+0x134/0x200 mm/slub.c:3253 sock_alloc_inode+0x1b/0xb0 net/socket.c:303 alloc_inode fs/inode.c:236 [inline] new_inode_pseudo+0x64/0x220 fs/inode.c:937 sock_alloc net/socket.c:626 [inline] __sock_create+0x135/0x760 net/socket.c:1450 sock_create_kern+0x3b/0x50 net/socket.c:1555 inet_ctl_sock_create+0xbe/0x200 net/ipv4/af_inet.c:1668 icmp_sk_init+0x15a/0x590 net/ipv4/icmp.c:1465 ops_init+0x1cf/0x4a0 net/core/net_namespace.c:135 setup_net+0x34b/0xb50 net/core/net_namespace.c:329 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_pages_ok+0x985/0xa50 mm/page_alloc.c:1772 free_the_page mm/page_alloc.c:807 [inline] __free_pages+0xe9/0xf0 mm/page_alloc.c:5855 free_nonslab_page+0x82/0xc0 mm/slub.c:3555 kfree+0x19e/0x220 mm/slub.c:4576 skb_free_head net/core/skbuff.c:656 [inline] skb_release_data+0x8a9/0xa80 net/core/skbuff.c:678 skb_release_all net/core/skbuff.c:743 [inline] __kfree_skb net/core/skbuff.c:757 [inline] consume_skb+0xac/0x250 net/core/skbuff.c:930 __sk_msg_free+0x2dd/0x370 net/core/skmsg.c:205 sk_msg_free net/core/skmsg.c:218 [inline] __sk_psock_purge_ingress_msg net/core/skmsg.c:768 [inline] __sk_psock_zap_ingress net/core/skmsg.c:786 [inline] sk_psock_stop+0x44c/0x4d0 net/core/skmsg.c:804 sk_psock_drop+0x219/0x310 net/core/skmsg.c:843 sk_psock_put include/linux/skmsg.h:458 [inline] sock_map_unref+0x48f/0x4d0 net/core/sock_map.c:183 sock_map_free+0x137/0x2b0 net/core/sock_map.c:353 bpf_map_free_deferred+0x10d/0x1e0 kernel/bpf/syscall.c:481 process_one_work+0x6bb/0xc10 kernel/workqueue.c:2325 worker_thread+0xad5/0x12a0 kernel/workqueue.c:2472 kthread+0x421/0x510 kernel/kthread.c:337 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:300 Memory state around the buggy address: ffff88813d270700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813d270780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88813d270800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88813d270880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813d270900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================