================================================================== BUG: KASAN: slab-use-after-free in xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] BUG: KASAN: slab-use-after-free in xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] BUG: KASAN: slab-use-after-free in xsk_diag_dump+0x1456/0x1980 net/xdp/xsk_diag.c:163 Read of size 4 at addr ffff888079d000e0 by task syz-executor.0/31314 CPU: 0 PID: 31314 Comm: syz-executor.0 Not tainted 6.5.0-syzkaller-12107-g7ba2090ca64e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 xsk_diag_put_info net/xdp/xsk_diag.c:21 [inline] xsk_diag_fill net/xdp/xsk_diag.c:114 [inline] xsk_diag_dump+0x1456/0x1980 net/xdp/xsk_diag.c:163 netlink_dump+0x656/0xcc0 net/netlink/af_netlink.c:2266 __netlink_dump_start+0x5cf/0x780 net/netlink/af_netlink.c:2372 netlink_dump_start include/linux/netlink.h:336 [inline] xsk_diag_handler_dump+0x1d7/0x260 net/xdp/xsk_diag.c:190 sock_diag_rcv_msg+0xe3/0x400 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2545 sock_diag_rcv+0x2a/0x40 net/core/sock_diag.c:280 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x7dc/0x970 net/netlink/af_netlink.c:1368 netlink_sendmsg+0xa37/0xd70 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] sock_write_iter+0x39a/0x520 net/socket.c:1140 do_iter_write+0x84f/0xde0 fs/read_write.c:860 vfs_writev fs/read_write.c:933 [inline] do_writev+0x27f/0x470 fs/read_write.c:976 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f23b7c7cae9 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:00007f23b8a380c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f23b7d9bf80 RCX: 00007f23b7c7cae9 RDX: 0000000000000001 RSI: 0000000020000100 RDI: 0000000000000004 RBP: 00007f23b7cc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f23b7d9bf80 R15: 00007fff68026a18 Allocated by task 16046: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:196 [inline] __do_kmalloc_node mm/slab_common.c:1023 [inline] __kmalloc_node_track_caller+0xb6/0x230 mm/slab_common.c:1043 kmemdup+0x2a/0x60 mm/util.c:131 __devinet_sysctl_register+0xb0/0x2a0 net/ipv4/devinet.c:2595 devinet_sysctl_register+0x13a/0x1a0 net/ipv4/devinet.c:2647 inetdev_init+0x291/0x4c0 net/ipv4/devinet.c:286 inetdev_event+0x342/0x1580 net/ipv4/devinet.c:1555 notifier_call_chain+0x18c/0x3a0 kernel/notifier.c:93 call_netdevice_notifiers_info net/core/dev.c:1970 [inline] call_netdevice_notifiers_extack net/core/dev.c:2008 [inline] call_netdevice_notifiers+0x149/0x1c0 net/core/dev.c:2022 register_netdevice+0x10d7/0x1510 net/core/dev.c:10169 ip_tunnel_newlink+0x681/0xd70 net/ipv4/ip_tunnel.c:1172 ipgre_newlink+0x3a8/0x550 net/ipv4/ip_gre.c:1366 rtnl_newlink_create net/core/rtnetlink.c:3485 [inline] __rtnl_newlink net/core/rtnetlink.c:3705 [inline] rtnl_newlink+0x1579/0x2070 net/core/rtnetlink.c:3718 rtnetlink_rcv_msg+0x82b/0xf50 net/core/rtnetlink.c:6444 netlink_rcv_skb+0x1df/0x430 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline] netlink_unicast+0x7dc/0x970 net/netlink/af_netlink.c:1368 netlink_sendmsg+0xa37/0xd70 net/netlink/af_netlink.c:1910 sock_sendmsg_nosec net/socket.c:730 [inline] sock_sendmsg net/socket.c:753 [inline] ____sys_sendmsg+0x592/0x890 net/socket.c:2540 ___sys_sendmsg net/socket.c:2594 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2623 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:492 kvfree_call_rcu+0xf8/0x790 kernel/rcu/tree.c:3372 drop_sysctl_table+0x386/0x4f0 fs/proc/proc_sysctl.c:1508 unregister_sysctl_table+0x41/0x60 fs/proc/proc_sysctl.c:1529 ipv4_sysctl_exit_net+0x82/0x90 net/ipv4/sysctl_net_ipv4.c:1548 ops_exit_list net/core/net_namespace.c:170 [inline] setup_net+0x8c8/0xbb0 net/core/net_namespace.c:362 copy_net_ns+0x4e3/0x7a0 net/core/net_namespace.c:491 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 copy_namespaces+0x3ec/0x460 kernel/nsproxy.c:179 copy_process+0x1af8/0x4290 kernel/fork.c:2504 kernel_clone+0x22d/0x7b0 kernel/fork.c:2909 __do_sys_clone kernel/fork.c:3052 [inline] __se_sys_clone kernel/fork.c:3036 [inline] __x64_sys_clone+0x258/0x2a0 kernel/fork.c:3036 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888079d00000 which belongs to the cache kmalloc-cg-4k of size 4096 The buggy address is located 224 bytes inside of freed 4096-byte region [ffff888079d00000, ffff888079d01000) The buggy address belongs to the physical page: page:ffffea0001e74000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888079d06000 pfn:0x79d00 head:ffffea0001e74000 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88804d1cb1c1 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff88801284f500 ffffea000077ec10 ffffea0001401a10 raw: ffff888079d06000 0000000000040001 00000001ffffffff ffff88804d1cb1c1 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4483, tgid 4483 (udevd), ts 620895603802, free_ts 618773029571 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1536 prep_new_page mm/page_alloc.c:1543 [inline] get_page_from_freelist+0x31db/0x3360 mm/page_alloc.c:3170 __alloc_pages+0x255/0x670 mm/page_alloc.c:4426 alloc_slab_page+0x6a/0x160 mm/slub.c:1870 allocate_slab mm/slub.c:2017 [inline] new_slab+0x84/0x2f0 mm/slub.c:2070 ___slab_alloc+0xade/0x1100 mm/slub.c:3223 __slab_alloc mm/slub.c:3322 [inline] __slab_alloc_node mm/slub.c:3375 [inline] slab_alloc_node mm/slub.c:3468 [inline] __kmem_cache_alloc_node+0x1af/0x270 mm/slub.c:3517 __do_kmalloc_node mm/slab_common.c:1022 [inline] __kmalloc_node+0xa7/0x230 mm/slab_common.c:1030 kmalloc_node include/linux/slab.h:619 [inline] kvmalloc_node+0x72/0x180 mm/util.c:607 kvmalloc include/linux/slab.h:737 [inline] seq_buf_alloc fs/seq_file.c:38 [inline] seq_read_iter+0x202/0xd10 fs/seq_file.c:210 call_read_iter include/linux/fs.h:1979 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x795/0xb00 fs/read_write.c:470 ksys_read+0x1a0/0x2c0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1136 [inline] free_unref_page_prepare+0x8c3/0x9f0 mm/page_alloc.c:2312 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2405 discard_slab mm/slub.c:2116 [inline] __unfreeze_partials+0x1dc/0x220 mm/slub.c:2655 put_cpu_partial+0x116/0x180 mm/slub.c:2731 __slab_free+0x2b6/0x390 mm/slub.c:3679 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x6c/0x3b0 mm/slab.h:762 slab_alloc_node mm/slub.c:3478 [inline] kmem_cache_alloc_node+0x148/0x330 mm/slub.c:3523 __alloc_skb+0x181/0x420 net/core/skbuff.c:634 alloc_skb include/linux/skbuff.h:1286 [inline] nlmsg_new include/net/netlink.h:999 [inline] inet_netconf_notify_devconf+0x15a/0x220 net/ipv4/devinet.c:2122 __devinet_sysctl_unregister net/ipv4/devinet.c:2634 [inline] devinet_exit_net+0x117/0x230 net/ipv4/devinet.c:2774 ops_exit_list net/core/net_namespace.c:170 [inline] cleanup_net+0x6d2/0xb80 net/core/net_namespace.c:614 process_one_work+0x781/0x1130 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0xabf/0x1060 kernel/workqueue.c:2784 Memory state around the buggy address: ffff888079cfff80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888079d00000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888079d00080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888079d00100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888079d00180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================