================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515 Read of size 8 at addr ffff888077815118 by task kworker/1:20/20295 CPU: 1 PID: 20295 Comm: kworker/1:20 Not tainted 5.15.110-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 Workqueue: events linkwatch_event Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x63/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x16b/0x1c0 mm/kasan/report.c:451 tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515 tcp_write_timer_handler+0x1f7/0x9c0 net/ipv4/tcp_timer.c:626 tcp_write_timer+0x12e/0x280 net/ipv4/tcp_timer.c:646 call_timer_fn+0x16d/0x560 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x67c/0x890 kernel/time/timer.c:1737 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1750 __do_softirq+0x3b3/0x93a kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x155/0x240 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:console_unlock+0xe53/0x12b0 kernel/printk/printk.c:2739 Code: 00 48 83 7c 24 18 00 75 19 e8 49 d7 19 00 eb 18 e8 42 d7 19 00 e8 4d 21 b4 08 48 83 7c 24 18 00 74 e7 e8 30 d7 19 00 fb 31 ff <44> 89 f6 e8 85 da 19 00 31 db 45 85 f6 0f 95 c0 89 c1 0a 4c 24 17 RSP: 0018:ffffc9000391f620 EFLAGS: 00000246 RAX: ffffffff81660750 RBX: 0000000000000000 RCX: ffff88801cf90000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000391f8b0 R08: ffffffff8166071b R09: fffffbfff1f78c21 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff1a49e3e R13: ffffffff8d24f228 R14: 0000000000000000 R15: dffffc0000000000 vprintk_emit+0xba/0x150 kernel/printk/printk.c:2268 _printk+0xd1/0x111 kernel/printk/printk.c:2289 addrconf_notify+0xa80/0xf30 net/ipv6/addrconf.c:3632 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:1998 [inline] netdev_state_change+0x1a3/0x250 net/core/dev.c:1389 linkwatch_do_dev+0x10c/0x160 net/core/link_watch.c:167 __linkwatch_run_queue+0x4ca/0x7f0 net/core/link_watch.c:213 linkwatch_event+0x48/0x50 net/core/link_watch.c:252 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2306 worker_thread+0xaca/0x1280 kernel/workqueue.c:2453 kthread+0x3f6/0x4f0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298 Allocated by task 17240: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] __kasan_slab_alloc+0x8e/0xc0 mm/kasan/common.c:467 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0xf3/0x280 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] net_alloc net/core/net_namespace.c:405 [inline] copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x580/0xb20 kernel/fork.c:3094 __do_sys_unshare kernel/fork.c:3168 [inline] __se_sys_unshare kernel/fork.c:3166 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb The buggy address belongs to the object at ffff888077814ec0 which belongs to the cache net_namespace of size 6464 The buggy address is located 600 bytes inside of 6464-byte region [ffff888077814ec0, ffff888077816800) The buggy address belongs to the page: page:ffffea0001de0400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888077811a40 pfn:0x77810 head:ffffea0001de0400 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff88805aacb9c1 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001d52800 0000000300000003 ffff888011dc63c0 raw: ffff888077811a40 0000000080040001 00000001ffffffff ffff88805aacb9c1 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 3516, ts 55008688966, free_ts 54723350574 prep_new_page mm/page_alloc.c:2426 [inline] get_page_from_freelist+0x322a/0x33c0 mm/page_alloc.c:4159 __alloc_pages+0x272/0x700 mm/page_alloc.c:5421 alloc_slab_page mm/slub.c:1775 [inline] allocate_slab mm/slub.c:1912 [inline] new_slab+0xbb/0x4b0 mm/slub.c:1975 ___slab_alloc+0x6f6/0xe10 mm/slub.c:3008 __slab_alloc mm/slub.c:3095 [inline] slab_alloc_node mm/slub.c:3186 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc+0x18e/0x280 mm/slub.c:3233 kmem_cache_zalloc include/linux/slab.h:711 [inline] net_alloc net/core/net_namespace.c:405 [inline] copy_net_ns+0x143/0x5d0 net/core/net_namespace.c:460 create_new_namespaces+0x425/0x7a0 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0x11e/0x170 kernel/nsproxy.c:226 ksys_unshare+0x580/0xb20 kernel/fork.c:3094 __do_sys_unshare kernel/fork.c:3168 [inline] __se_sys_unshare kernel/fork.c:3166 [inline] __x64_sys_unshare+0x34/0x40 kernel/fork.c:3166 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1340 [inline] free_pcp_prepare mm/page_alloc.c:1391 [inline] free_unref_page_prepare+0xc34/0xcf0 mm/page_alloc.c:3317 free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396 free_slab mm/slub.c:2015 [inline] discard_slab mm/slub.c:2021 [inline] __unfreeze_partials+0x1b7/0x210 mm/slub.c:2507 put_cpu_partial+0x132/0x1a0 mm/slub.c:2587 do_slab_free mm/slub.c:3487 [inline] ___cache_free+0xe3/0x100 mm/slub.c:3506 qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook+0x53/0x380 mm/slab.h:519 slab_alloc_node mm/slub.c:3220 [inline] slab_alloc mm/slub.c:3228 [inline] kmem_cache_alloc_trace+0xfb/0x290 mm/slub.c:3245 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] tomoyo_print_bprm security/tomoyo/audit.c:26 [inline] tomoyo_init_log+0x1140/0x1fe0 security/tomoyo/audit.c:264 tomoyo_supervisor+0x3b8/0x12c0 security/tomoyo/common.c:2097 tomoyo_audit_env_log security/tomoyo/environ.c:36 [inline] tomoyo_env_perm+0x174/0x210 security/tomoyo/environ.c:63 tomoyo_environ security/tomoyo/domain.c:672 [inline] tomoyo_find_next_domain+0x137e/0x1cf0 security/tomoyo/domain.c:879 tomoyo_bprm_check_security+0xdb/0x120 security/tomoyo/tomoyo.c:101 security_bprm_check+0x5f/0xa0 security/security.c:868 Memory state around the buggy address: ffff888077815000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077815080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888077815100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888077815180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888077815200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 00 48 83 add %cl,-0x7d(%rax) 3: 7c 24 jl 0x29 5: 18 00 sbb %al,(%rax) 7: 75 19 jne 0x22 9: e8 49 d7 19 00 callq 0x19d757 e: eb 18 jmp 0x28 10: e8 42 d7 19 00 callq 0x19d757 15: e8 4d 21 b4 08 callq 0x8b42167 1a: 48 83 7c 24 18 00 cmpq $0x0,0x18(%rsp) 20: 74 e7 je 0x9 22: e8 30 d7 19 00 callq 0x19d757 27: fb sti 28: 31 ff xor %edi,%edi * 2a: 44 89 f6 mov %r14d,%esi <-- trapping instruction 2d: e8 85 da 19 00 callq 0x19dab7 32: 31 db xor %ebx,%ebx 34: 45 85 f6 test %r14d,%r14d 37: 0f 95 c0 setne %al 3a: 89 c1 mov %eax,%ecx 3c: 0a 4c 24 17 or 0x17(%rsp),%cl