================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511 Read of size 8 at addr ffff8880753502b8 by task syz-executor.5/25122 CPU: 1 PID: 25122 Comm: syz-executor.5 Not tainted 5.17.0-rc8-syzkaller-00045-g551acdc3c3d2 #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+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 tcp_retransmit_timer+0x2ea2/0x3320 net/ipv4/tcp_timer.c:511 tcp_write_timer_handler+0x5e6/0xbc0 net/ipv4/tcp_timer.c:622 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642 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+0x45/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0033:0x7f7f6cd6feec Code: 48 89 ee 4c 89 e3 4c 89 c0 0f 1f 44 00 00 49 89 dd 48 39 cf 72 2f 48 83 e8 08 48 39 d1 73 14 0f 1f 80 00 00 00 00 48 8b 50 f8 <48> 83 e8 08 48 39 ca 77 f3 48 39 c3 73 3e 48 89 13 48 8b 50 f8 48 RSP: 002b:00007ffeb694e5d0 EFLAGS: 00000297 RAX: 00007f7f6c90f808 RBX: 00007f7f6c9047f8 RCX: ffffffff87fa7473 RDX: ffffffff87edf476 RSI: 00007f7f6c904800 RDI: ffffffff88024f46 RBP: 00007f7f6c8e47f8 R08: 00007f7f6c91f610 R09: 0000000041256ef2 R10: 00007ffeb699a090 R11: 0000000000030b78 R12: 00007f7f6c8e47f0 R13: 00007f7f6c9047f8 R14: 00007f7f6c8e47e8 R15: 000000000000001b Allocated by task 3621: 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+0x271/0x4b0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:704 [inline] net_alloc net/core/net_namespace.c:406 [inline] copy_net_ns+0x125/0x760 net/core/net_namespace.c:461 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:3058 __do_sys_unshare kernel/fork.c:3129 [inline] __se_sys_unshare kernel/fork.c:3127 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3127 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+0x48/0x370 kernel/workqueue.c:1368 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1534 queue_work_on+0xee/0x110 kernel/workqueue.c:1562 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/0x2220 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+0xc5d/0x3b30 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+0x48/0x370 kernel/workqueue.c:1368 __queue_work+0x5ca/0xf30 kernel/workqueue.c:1534 queue_work_on+0xee/0x110 kernel/workqueue.c:1562 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/0x2220 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+0xc5d/0x3b30 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 ffff888075350000 which belongs to the cache net_namespace of size 6528 The buggy address is located 696 bytes inside of 6528-byte region [ffff888075350000, ffff888075351980) The buggy address belongs to the page: page:ffffea0001d4d400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888075350000 pfn:0x75350 head:ffffea0001d4d400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888069a9f041 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff8880159a5000 raw: ffff888075350000 0000000080040000 00000001ffffffff ffff888069a9f041 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 3621, ts 133072447163, free_ts 132950969022 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x27f/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0xbe1/0x12b0 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+0x3cb/0x4b0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:704 [inline] net_alloc net/core/net_namespace.c:406 [inline] copy_net_ns+0x125/0x760 net/core/net_namespace.c:461 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:3058 __do_sys_unshare kernel/fork.c:3129 [inline] __se_sys_unshare kernel/fork.c:3127 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3127 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+0x374/0x870 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 qlink_free mm/kasan/quarantine.c:157 [inline] qlist_free_all+0x6d/0x160 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+0x256/0x450 mm/slub.c:4420 kmalloc include/linux/slab.h:586 [inline] tomoyo_add_entry security/tomoyo/common.c:2031 [inline] tomoyo_supervisor+0xce6/0xf00 security/tomoyo/common.c:2103 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_check_open_permission+0x30f/0x380 security/tomoyo/file.c:780 tomoyo_file_open security/tomoyo/tomoyo.c:311 [inline] tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:306 security_file_open+0x45/0xb0 security/security.c:1638 do_dentry_open+0x358/0x1250 fs/open.c:811 do_open fs/namei.c:3476 [inline] path_openat+0x1c9e/0x2940 fs/namei.c:3609 do_filp_open+0x1aa/0x400 fs/namei.c:3636 do_sys_openat2+0x16d/0x4d0 fs/open.c:1214 do_sys_open fs/open.c:1230 [inline] __do_sys_openat fs/open.c:1246 [inline] __se_sys_openat fs/open.c:1241 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1241 Memory state around the buggy address: ffff888075350180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888075350200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888075350280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888075350300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888075350380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== vkms_vblank_simulate: vblank timer overrun