================================================================== BUG: KASAN: slab-use-after-free in consumer_filter kernel/events/uprobes.c:869 [inline] BUG: KASAN: slab-use-after-free in filter_chain kernel/events/uprobes.c:880 [inline] BUG: KASAN: slab-use-after-free in uprobe_mmap+0xb9a/0x11a0 kernel/events/uprobes.c:1387 Read of size 8 at addr ffff88801a3a3c30 by task syz.4.4348/31267 CPU: 1 UID: 0 PID: 31267 Comm: syz.4.4348 Not tainted 6.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0x169/0x550 mm/kasan/report.c:488 kasan_report+0x143/0x180 mm/kasan/report.c:601 consumer_filter kernel/events/uprobes.c:869 [inline] filter_chain kernel/events/uprobes.c:880 [inline] uprobe_mmap+0xb9a/0x11a0 kernel/events/uprobes.c:1387 mmap_region+0x1891/0x2090 mm/mmap.c:3058 do_mmap+0x8f9/0x1010 mm/mmap.c:1468 vm_mmap_pgoff+0x1dd/0x3d0 mm/util.c:588 ksys_mmap_pgoff+0x4f1/0x720 mm/mmap.c:1514 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffbf2779e79 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:00007ffbf34ce038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007ffbf2915f80 RCX: 00007ffbf2779e79 RDX: 0000000000000001 RSI: 0000000000003000 RDI: 0000000020000000 RBP: 00007ffbf27e7916 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000000000012 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffbf2915f80 R15: 00007ffd3567a388 Allocated by task 27899: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387 kasan_kmalloc include/linux/kasan.h:211 [inline] __kmalloc_cache_noprof+0x19c/0x2c0 mm/slub.c:4189 kmalloc_noprof include/linux/slab.h:681 [inline] netdev_name_node_alloc net/core/dev.c:266 [inline] netdev_name_node_head_alloc net/core/dev.c:280 [inline] register_netdevice+0x59c/0x1b00 net/core/dev.c:10365 ipvlan_link_new+0x38e/0xa30 drivers/net/ipvlan/ipvlan_main.c:588 rtnl_newlink_create net/core/rtnetlink.c:3510 [inline] __rtnl_newlink net/core/rtnetlink.c:3730 [inline] rtnl_newlink+0x1591/0x20a0 net/core/rtnetlink.c:3743 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline] netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1357 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1901 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 __sys_sendto+0x3a4/0x4f0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xde/0x100 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 2967: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x149/0x360 mm/slub.c:4594 netdev_name_node_free net/core/dev.c:289 [inline] unregister_netdevice_many_notify+0x104d/0x1c40 net/core/dev.c:11367 unregister_netdevice_many net/core/dev.c:11414 [inline] default_device_exit_batch+0xa0f/0xa90 net/core/dev.c:11897 ops_exit_list net/core/net_namespace.c:178 [inline] cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:640 process_one_work kernel/workqueue.c:3231 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312 worker_thread+0x86d/0xd40 kernel/workqueue.c:3390 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff88801a3a3c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 48 bytes inside of freed 64-byte region [ffff88801a3a3c00, ffff88801a3a3c40) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a3a3 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff8880154418c0 ffffea00019574c0 dead000000000002 raw: 0000000000000000 0000000000200020 00000001fdffffff 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5214, tgid 5214 (syz-executor), ts 59962751402, free_ts 59922873136 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x2e4c/0x2f10 mm/page_alloc.c:3439 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4695 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x5f/0x120 mm/slub.c:2321 allocate_slab+0x5a/0x2f0 mm/slub.c:2484 new_slab mm/slub.c:2537 [inline] ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3723 __slab_alloc+0x58/0xa0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __kmalloc_cache_noprof+0x1d5/0x2c0 mm/slub.c:4184 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] sctp_inet6addr_event+0x366/0x730 net/sctp/ipv6.c:86 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 atomic_notifier_call_chain+0xdb/0x180 kernel/notifier.c:231 ipv6_add_addr+0xde0/0x1090 net/ipv6/addrconf.c:1180 inet6_addr_add+0x563/0xb00 net/ipv6/addrconf.c:3060 inet6_rtm_newaddr+0x8a3/0xc90 net/ipv6/addrconf.c:5048 rtnetlink_rcv_msg+0x73f/0xcf0 net/core/rtnetlink.c:6647 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2550 page last free pid 5218 tgid 5218 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd19/0xea0 mm/page_alloc.c:2612 discard_slab mm/slub.c:2583 [inline] __put_partials+0xeb/0x130 mm/slub.c:3051 put_cpu_partial+0x17c/0x250 mm/slub.c:3126 __slab_free+0x2ea/0x3d0 mm/slub.c:4343 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_noprof+0x1a6/0x400 mm/slub.c:4170 kmalloc_noprof include/linux/slab.h:685 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] fib_create_info+0xa49/0x24e0 net/ipv4/fib_semantics.c:1459 fib_table_insert+0x1f6/0x1f30 net/ipv4/fib_trie.c:1237 fib_magic+0x3d8/0x620 net/ipv4/fib_frontend.c:1104 fib_add_ifaddr+0x14c/0x5e0 net/ipv4/fib_frontend.c:1126 fib_inetaddr_event+0x167/0x1f0 net/ipv4/fib_frontend.c:1440 notifier_call_chain+0x19f/0x3e0 kernel/notifier.c:93 blocking_notifier_call_chain+0x69/0x90 kernel/notifier.c:388 __inet_insert_ifa+0x9d4/0xc30 net/ipv4/devinet.c:561 Memory state around the buggy address: ffff88801a3a3b00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88801a3a3b80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc >ffff88801a3a3c00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff88801a3a3c80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ffff88801a3a3d00: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================