================================================================== BUG: KASAN: slab-out-of-bounds in __io_uring_show_fdinfo io_uring/fdinfo.c:98 [inline] BUG: KASAN: slab-out-of-bounds in io_uring_show_fdinfo+0x625/0x1947 io_uring/fdinfo.c:206 Read of size 8 at addr ffff88806d7d7ea0 by task syz-executor.0/10713 CPU: 1 PID: 10713 Comm: syz-executor.0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:317 [inline] print_report.cold+0x2ba/0x719 mm/kasan/report.c:433 kasan_report+0xb1/0x1e0 mm/kasan/report.c:495 __io_uring_show_fdinfo io_uring/fdinfo.c:98 [inline] io_uring_show_fdinfo+0x625/0x1947 io_uring/fdinfo.c:206 seq_show+0x587/0x800 fs/proc/fd.c:68 seq_read_iter+0x4f5/0x1280 fs/seq_file.c:230 seq_read+0x16d/0x210 fs/seq_file.c:162 do_loop_readv_writev fs/read_write.c:756 [inline] do_loop_readv_writev fs/read_write.c:743 [inline] do_iter_read+0x4f8/0x750 fs/read_write.c:798 vfs_readv+0xe5/0x150 fs/read_write.c:916 do_readv+0x133/0x2f0 fs/read_write.c:953 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f73d0c8b5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f73d1d24168 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00007f73d0dabf80 RCX: 00007f73d0c8b5a9 RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 00007f73d0ce6580 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f73d12dfb1f R14: 00007f73d1d24300 R15: 0000000000022000 Allocated by task 9893: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc mm/kasan/common.c:516 [inline] ____kasan_kmalloc mm/kasan/common.c:475 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:525 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] ipv6_add_dev+0xfe/0x1390 net/ipv6/addrconf.c:378 addrconf_notify+0x6f9/0x1c10 net/ipv6/addrconf.c:3528 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] register_netdevice+0x10bb/0x1670 net/core/dev.c:10086 veth_newlink+0x4cf/0x990 drivers/net/veth.c:1795 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3581 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x712/0x8c0 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x8f0 kernel/rcu/tree.c:3341 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1716 unregister_sysctl_table fs/proc/proc_sysctl.c:1754 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1729 sctp_sysctl_net_unregister+0x58/0x80 net/sctp/sysctl.c:602 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x8f0 kernel/rcu/tree.c:3341 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1716 unregister_sysctl_table fs/proc/proc_sysctl.c:1754 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1729 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7112 [inline] addrconf_sysctl_unregister+0xee/0x1c0 net/ipv6/addrconf.c:7140 addrconf_ifdown.isra.0+0x1350/0x1920 net/ipv6/addrconf.c:3903 addrconf_notify+0xeb/0x1c10 net/ipv6/addrconf.c:3673 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] unregister_netdevice_many+0xa69/0x1980 net/core/dev.c:10843 ip6_tnl_exit_batch_net+0x5f5/0x890 net/ipv6/ip6_tunnel.c:2279 ops_exit_list+0x125/0x170 net/core/net_namespace.c:167 setup_net+0x7fb/0xc50 net/core/net_namespace.c:348 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x307b/0x7110 kernel/fork.c:2257 kernel_clone+0xe7/0x8f0 kernel/fork.c:2672 __do_sys_clone+0xba/0x100 kernel/fork.c:2806 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88806d7d7000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 1696 bytes to the right of 2048-byte region [ffff88806d7d7000, ffff88806d7d7800) The buggy address belongs to the physical page: page:ffffea0001b5f400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6d7d0 head:ffffea0001b5f400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff8880267ac781 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001e07000 dead000000000002 ffff88801184c140 raw: 0000000000000000 0000000000080008 00000001ffffffff ffff8880267ac781 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 6983, tgid 6977 (syz-executor.3), ts 326662570404, free_ts 326207674341 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x109b/0x2ce0 mm/page_alloc.c:4283 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5549 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:1829 [inline] allocate_slab+0x27e/0x3d0 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x84f/0xe80 mm/slub.c:3036 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3123 slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3256 [inline] __kmalloc_track_caller+0x325/0x340 mm/slub.c:4931 kmemdup+0x23/0x50 mm/util.c:129 kmemdup include/linux/fortify-string.h:565 [inline] neigh_sysctl_register+0x9a/0x5e0 net/core/neighbour.c:3790 devinet_sysctl_register+0xb1/0x230 net/ipv4/devinet.c:2623 inetdev_init+0x286/0x580 net/ipv4/devinet.c:279 inetdev_event+0xa85/0x1610 net/ipv4/devinet.c:1534 notifier_call_chain+0xb5/0x200 kernel/notifier.c:87 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945 call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers net/core/dev.c:1997 [inline] register_netdevice+0x10bb/0x1670 net/core/dev.c:10086 register_netdev+0x2d/0x50 net/core/dev.c:10179 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x5e4/0xd20 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3476 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2553 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] slab_alloc mm/slub.c:3256 [inline] __kmalloc+0x28a/0x340 mm/slub.c:4425 kmalloc include/linux/slab.h:605 [inline] tomoyo_realpath_from_path+0xbf/0x600 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_number_perm+0x205/0x550 security/tomoyo/file.c:723 security_file_ioctl+0x50/0xb0 security/security.c:1554 __do_sys_ioctl fs/ioctl.c:864 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0xb3/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88806d7d7d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806d7d7e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88806d7d7e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88806d7d7f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88806d7d7f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================