================================================================== BUG: KASAN: use-after-free in inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46 Read of size 8 at addr ffff888077aa04c0 by task syz-fuzzer/3601 CPU: 1 PID: 3601 Comm: syz-fuzzer Not tainted 5.17.0-rc1-next-20220127-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xa5/0x3e0 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 inet_twsk_kill+0x358/0x3c0 net/ipv4/inet_timewait_sock.c:46 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x67c/0xa30 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:finish_task_switch.isra.0+0x323/0xb80 kernel/sched/core.c:4866 Code: 93 97 0a 08 85 c0 75 02 0f 0b 48 85 db 0f 85 25 01 00 00 4c 89 f7 e8 fc f7 ff ff e8 67 a6 2d 00 fb 65 48 8b 1c 25 00 70 02 00 <48> 8d bb 88 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc90001a7fb20 EFLAGS: 00000202 RAX: 00000000001cb091 RBX: ffff888018679d40 RCX: 1ffffffff1b2bef9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90001a7fb68 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff817eb9d8 R11: 0000000000000001 R12: ffff8880b9d3a998 R13: ffff88801da357c0 R14: ffff8880b9d39c40 R15: ffff8880b9d3a678 context_switch kernel/sched/core.c:4989 [inline] __schedule+0xaba/0x4db0 kernel/sched/core.c:6295 schedule+0xd2/0x260 kernel/sched/core.c:6368 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x24e/0x690 kernel/time/hrtimer.c:2044 hrtimer_nanosleep+0x1f9/0x4a0 kernel/time/hrtimer.c:2097 __do_sys_nanosleep kernel/time/hrtimer.c:2131 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:2118 [inline] __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:2118 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+0x44/0xae RIP: 0033:0x46db9d Code: 8b 44 24 20 b9 40 42 0f 00 f7 f1 48 89 04 24 b8 e8 03 00 00 f7 e2 48 89 44 24 08 48 89 e7 be 00 00 00 00 b8 23 00 00 00 0f 05 <48> 8b 6c 24 10 48 83 c4 18 c3 cc cc cc cc cc cc cc cc cc cc cc cc RSP: 002b:000000c00003ff18 EFLAGS: 00000202 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 000000000046db9d RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000c00003ff18 RBP: 000000c00003ff28 R08: 000000000001aeca R09: 00007ffc1a1dc080 R10: 00007ffc1a1dc090 R11: 0000000000000202 R12: 000000000043b6e0 R13: 0000000000000000 R14: 00000000008e0e1c R15: 0000000000000000 Allocated by task 3631: 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:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] net_alloc net/core/net_namespace.c:407 [inline] copy_net_ns+0x125/0x760 net/core/net_namespace.c:462 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3048 __do_sys_unshare kernel/fork.c:3119 [inline] __se_sys_unshare kernel/fork.c:3117 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117 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+0x44/0xae 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 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1517 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] xfrm_hash_grow_check net/xfrm/xfrm_state.c:1025 [inline] xfrm_hash_grow_check net/xfrm/xfrm_state.c:1020 [inline] xfrm_state_find+0x4ae8/0x4f00 net/xfrm/xfrm_state.c:1185 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2393 [inline] xfrm_tmpl_resolve+0x2f3/0xd40 net/xfrm/xfrm_policy.c:2438 xfrm_resolve_and_create_bundle+0x123/0x25a0 net/xfrm/xfrm_policy.c:2726 xfrm_lookup_with_ifid+0x22a/0x2240 net/xfrm/xfrm_policy.c:3060 xfrm_lookup net/xfrm/xfrm_policy.c:3189 [inline] xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:3200 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1206 rawv6_sendmsg+0xc5f/0x3a10 net/ipv6/raw.c:928 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x331/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmmsg+0x195/0x470 net/socket.c:2553 __do_sys_sendmmsg net/socket.c:2582 [inline] __se_sys_sendmmsg net/socket.c:2579 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579 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+0x44/0xae 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 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1517 queue_work_on+0xee/0x110 kernel/workqueue.c:1545 queue_work include/linux/workqueue.h:502 [inline] schedule_work include/linux/workqueue.h:563 [inline] xfrm_hash_grow_check net/xfrm/xfrm_state.c:1025 [inline] xfrm_hash_grow_check net/xfrm/xfrm_state.c:1020 [inline] xfrm_state_find+0x4ae8/0x4f00 net/xfrm/xfrm_state.c:1185 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2393 [inline] xfrm_tmpl_resolve+0x2f3/0xd40 net/xfrm/xfrm_policy.c:2438 xfrm_resolve_and_create_bundle+0x123/0x25a0 net/xfrm/xfrm_policy.c:2726 xfrm_lookup_with_ifid+0x22a/0x2240 net/xfrm/xfrm_policy.c:3060 xfrm_lookup net/xfrm/xfrm_policy.c:3189 [inline] xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:3200 ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1206 rawv6_sendmsg+0xc5f/0x3a10 net/ipv6/raw.c:928 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 ____sys_sendmsg+0x331/0x810 net/socket.c:2413 ___sys_sendmsg+0xf3/0x170 net/socket.c:2467 __sys_sendmmsg+0x195/0x470 net/socket.c:2553 __do_sys_sendmmsg net/socket.c:2582 [inline] __se_sys_sendmmsg net/socket.c:2579 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2579 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+0x44/0xae The buggy address belongs to the object at ffff888077aa0000 which belongs to the cache net_namespace of size 6528 The buggy address is located 1216 bytes inside of 6528-byte region [ffff888077aa0000, ffff888077aa1980) The buggy address belongs to the page: page:ffffea0001dea800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077aa0000 pfn:0x77aa0 head:ffffea0001dea800 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888018d80501 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880118d5a00 raw: ffff888077aa0000 0000000080040001 00000001ffffffff ffff888018d80501 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3631, ts 100383857695, free_ts 100378445137 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5381 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab mm/slub.c:1944 [inline] new_slab+0x28d/0x380 mm/slub.c:2004 ___slab_alloc+0x6be/0xd60 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x35c/0x3a0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:705 [inline] net_alloc net/core/net_namespace.c:407 [inline] copy_net_ns+0x125/0x760 net/core/net_namespace.c:462 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3048 __do_sys_unshare kernel/fork.c:3119 [inline] __se_sys_unshare kernel/fork.c:3117 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3117 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+0x44/0xae page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3404 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2536 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] __kmalloc_track_caller+0x1e9/0x320 mm/slub.c:4926 kmemdup+0x23/0x50 mm/util.c:128 kmemdup include/linux/fortify-string.h:430 [inline] ipv6_route_sysctl_init+0x24/0x360 net/ipv6/route.c:6427 ipv6_sysctl_net_init+0x96/0x2a0 net/ipv6/sysctl_net_ipv6.c:272 ops_init+0xaf/0x470 net/core/net_namespace.c:140 setup_net+0x554/0xbb0 net/core/net_namespace.c:331 copy_net_ns+0x318/0x760 net/core/net_namespace.c:475 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3048 Memory state around the buggy address: ffff888077aa0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077aa0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077aa0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077aa0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077aa0580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 93 xchg %eax,%ebx 1: 97 xchg %eax,%edi 2: 0a 08 or (%rax),%cl 4: 85 c0 test %eax,%eax 6: 75 02 jne 0xa 8: 0f 0b ud2 a: 48 85 db test %rbx,%rbx d: 0f 85 25 01 00 00 jne 0x138 13: 4c 89 f7 mov %r14,%rdi 16: e8 fc f7 ff ff callq 0xfffff817 1b: e8 67 a6 2d 00 callq 0x2da687 20: fb sti 21: 65 48 8b 1c 25 00 70 mov %gs:0x27000,%rbx 28: 02 00 * 2a: 48 8d bb 88 15 00 00 lea 0x1588(%rbx),%rdi <-- trapping instruction 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 48 89 fa mov %rdi,%rdx 3e: 48 rex.W 3f: c1 .byte 0xc1