================================================================== BUG: KASAN: use-after-free in sysv_new_inode+0x107e/0x1210 fs/sysv/ialloc.c:153 Read of size 2 at addr ffff888056c091ce by task syz-executor.4/4171 CPU: 0 PID: 4171 Comm: syz-executor.4 Not tainted 6.1.87-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15f/0x4f0 mm/kasan/report.c:395 kasan_report+0x136/0x160 mm/kasan/report.c:495 sysv_new_inode+0x107e/0x1210 fs/sysv/ialloc.c:153 sysv_mknod+0x4a/0xe0 fs/sysv/namei.c:53 lookup_open fs/namei.c:3484 [inline] open_last_lookups fs/namei.c:3552 [inline] path_openat+0x12f1/0x2e60 fs/namei.c:3782 do_filp_open+0x230/0x480 fs/namei.c:3812 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_creat fs/open.c:1410 [inline] __se_sys_creat fs/open.c:1404 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1404 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f70d0e7dea9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f70d1ba10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f70d0fabf80 RCX: 00007f70d0e7dea9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00007f70d0eca4a4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f70d0fabf80 R15: 00007ffeeb07db18 Allocated by task 3563: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xb2/0x230 mm/slab_common.c:968 kmalloc include/linux/slab.h:561 [inline] kzalloc include/linux/slab.h:692 [inline] fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:156 ip6_route_info_create+0x446/0x12c0 net/ipv6/route.c:3750 ip6_route_add+0x22/0x120 net/ipv6/route.c:3844 addrconf_add_mroute net/ipv6/addrconf.c:2506 [inline] addrconf_add_dev+0x350/0x500 net/ipv6/addrconf.c:2524 addrconf_dev_config net/ipv6/addrconf.c:3408 [inline] addrconf_init_auto_addrs+0x88e/0xe60 net/ipv6/addrconf.c:3495 addrconf_notify+0xade/0xf60 net/ipv6/addrconf.c:3668 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455 __dev_notify_flags+0x304/0x610 dev_change_flags+0xe7/0x190 net/core/dev.c:8661 do_setlink+0xcf4/0x3e30 net/core/rtnetlink.c:2801 __rtnl_newlink net/core/rtnetlink.c:3576 [inline] rtnl_newlink+0x172c/0x2050 net/core/rtnetlink.c:3623 rtnetlink_rcv_msg+0x818/0xff0 net/core/rtnetlink.c:6121 netlink_rcv_skb+0x1cd/0x410 net/netlink/af_netlink.c:2508 netlink_unicast_kernel net/netlink/af_netlink.c:1326 [inline] netlink_unicast+0x7d8/0x970 net/netlink/af_netlink.c:1352 netlink_sendmsg+0xa26/0xd60 net/netlink/af_netlink.c:1874 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x480/0x600 net/socket.c:2148 __do_sys_sendto net/socket.c:2160 [inline] __se_sys_sendto net/socket.c:2156 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2156 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Freed by task 21: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x25c/0x3c0 mm/slub.c:3674 rcu_do_batch kernel/rcu/tree.c:2296 [inline] rcu_core+0xad5/0x1810 kernel/rcu/tree.c:2556 __do_softirq+0x2e9/0xa4c kernel/softirq.c:571 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:486 call_rcu+0x163/0xa10 kernel/rcu/tree.c:2844 fib6_info_release include/net/ip6_fib.h:340 [inline] fib6_del_route net/ipv6/ip6_fib.c:1995 [inline] fib6_del+0x10e8/0x1570 net/ipv6/ip6_fib.c:2028 fib6_clean_node+0x2ed/0x5d0 net/ipv6/ip6_fib.c:2190 fib6_walk_continue+0x636/0x8c0 net/ipv6/ip6_fib.c:2112 fib6_walk+0x168/0x2b0 net/ipv6/ip6_fib.c:2160 fib6_clean_tree net/ipv6/ip6_fib.c:2240 [inline] __fib6_clean_all+0x31b/0x4b0 net/ipv6/ip6_fib.c:2256 rt6_sync_down_dev net/ipv6/route.c:4895 [inline] rt6_disable_ip+0x14c/0x890 net/ipv6/route.c:4900 addrconf_ifdown+0x154/0x1b90 net/ipv6/addrconf.c:3781 addrconf_notify+0x3ec/0xf60 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1970 [inline] call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers net/core/dev.c:2022 [inline] dev_close_many+0x37c/0x530 net/core/dev.c:1570 unregister_netdevice_many+0x4f7/0x17a0 net/core/dev.c:10855 default_device_exit_batch+0x956/0x9d0 net/core/dev.c:11394 ops_exit_list net/core/net_namespace.c:174 [inline] cleanup_net+0x763/0xb60 net/core/net_namespace.c:601 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439 kthread+0x28d/0x320 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 The buggy address belongs to the object at ffff888056c09000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 462 bytes inside of 512-byte region [ffff888056c09000, ffff888056c09200) The buggy address belongs to the physical page: page:ffffea00015b0200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56c08 head:ffffea00015b0200 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff80000010200(slab|head|node=0|zone=1|lastcpupid=0xfff) raw: 00fff80000010200 ffffea00016e5700 dead000000000002 ffff888012441c80 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 Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 3563, tgid 3563 (syz-executor.0), ts 76638147318, free_ts 17186578833 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x18d/0x1b0 mm/page_alloc.c:2513 prep_new_page mm/page_alloc.c:2520 [inline] get_page_from_freelist+0x31a1/0x3320 mm/page_alloc.c:4279 __alloc_pages+0x28d/0x770 mm/page_alloc.c:5547 __alloc_pages_node include/linux/gfp.h:237 [inline] alloc_slab_page+0x59/0x150 mm/slub.c:1796 allocate_slab mm/slub.c:1939 [inline] new_slab+0x84/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x19f/0x260 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node+0xa2/0x230 mm/slab_common.c:962 kmalloc_array_node include/linux/slab.h:669 [inline] kcalloc_node include/linux/slab.h:674 [inline] memcg_alloc_slab_cgroups+0x7d/0x120 mm/memcontrol.c:2886 account_slab mm/slab.h:635 [inline] allocate_slab mm/slub.c:1957 [inline] new_slab+0xc0/0x2d0 mm/slub.c:1992 ___slab_alloc+0xc20/0x1270 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] slab_alloc mm/slub.c:3406 [inline] __kmem_cache_alloc_lru mm/slub.c:3413 [inline] kmem_cache_alloc+0x1a5/0x2d0 mm/slub.c:3422 __sigqueue_alloc+0x42e/0x540 kernel/signal.c:435 __send_signal_locked+0x22f/0xdc0 kernel/signal.c:1128 do_send_sig_info kernel/signal.c:1300 [inline] group_send_sig_info+0x28a/0x300 kernel/signal.c:1448 bpf_send_signal_common+0x2d8/0x420 kernel/trace/bpf_trace.c:882 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1440 [inline] free_pcp_prepare mm/page_alloc.c:1490 [inline] free_unref_page_prepare+0xf63/0x1120 mm/page_alloc.c:3358 free_unref_page+0x33/0x3e0 mm/page_alloc.c:3453 free_contig_range+0x9a/0x150 mm/page_alloc.c:9507 destroy_args+0xfe/0x997 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x416/0x46b mm/debug_vm_pgtable.c:1354 do_one_initcall+0x265/0x8f0 init/main.c:1297 do_initcall_level+0x157/0x207 init/main.c:1370 do_initcalls+0x49/0x86 init/main.c:1386 kernel_init_freeable+0x45c/0x60f init/main.c:1625 kernel_init+0x19/0x290 init/main.c:1513 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Memory state around the buggy address: ffff888056c09080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056c09100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888056c09180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888056c09200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056c09280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================