================================================================== BUG: KASAN: use-after-free in tcp_retransmit_timer+0x6ee/0x2890 net/ipv4/tcp_timer.c:515 Read of size 8 at addr ffff88807eb9b6d8 by task syz-executor.1/12695 CPU: 1 PID: 12695 Comm: syz-executor.1 Not tainted 5.15.106-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 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:mod_delayed_work_on+0x1cf/0x250 kernel/workqueue.c:1754 Code: 00 00 00 e8 43 64 2d 00 4c 8b 3c 24 4d 85 e4 48 bb 00 00 00 00 00 fc ff df 75 07 e8 2b 64 2d 00 eb 06 e8 24 64 2d 00 fb 31 ff <44> 89 f6 e8 79 67 2d 00 45 85 f6 0f 95 c0 48 c7 44 24 20 0e 36 e0 RSP: 0018:ffffc90003efe000 EFLAGS: 00000246 RAX: ffffffff8152568c RBX: dffffc0000000000 RCX: ffff88801dad9d00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90003efe0d0 R08: ffffffff8152565f R09: fffffbfff1f76e29 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000200 R13: 0000000000000046 R14: 0000000000000000 R15: 1ffff920007dfc04 kblockd_mod_delayed_work_on+0x25/0x30 block/blk-core.c:1635 blk_mq_do_dispatch_sched+0xcad/0xd50 block/blk-mq-sched.c:218 __blk_mq_sched_dispatch_requests+0x39b/0x490 blk_mq_sched_dispatch_requests+0xec/0x160 block/blk-mq-sched.c:366 __blk_mq_run_hw_queue+0x11a/0x1b0 block/blk-mq.c:1495 __blk_mq_delay_run_hw_queue+0x132/0x5e0 block/blk-mq.c:1572 blk_mq_run_hw_queue+0x1d5/0x3c0 block/blk-mq.c:1625 blk_mq_sched_insert_requests+0x2cd/0x570 block/blk-mq-sched.c:519 blk_mq_flush_plug_list+0x5de/0x6b0 block/blk-mq.c:1949 blk_flush_plug_list+0x44b/0x490 block/blk-core.c:1733 blk_finish_plug+0x59/0x80 block/blk-core.c:1750 read_pages+0x4cb/0x8e0 mm/readahead.c:150 page_cache_ra_unbounded+0x7b0/0x930 mm/readahead.c:239 page_cache_sync_readahead include/linux/pagemap.h:833 [inline] filemap_get_pages mm/filemap.c:2551 [inline] filemap_read+0x71c/0x2980 mm/filemap.c:2634 __kernel_read+0x5ac/0xa60 fs/read_write.c:443 integrity_kernel_read+0xac/0xf0 security/integrity/iint.c:199 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:485 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:516 [inline] ima_calc_file_hash+0xa5d/0x1c00 security/integrity/ima/ima_crypto.c:573 ima_collect_measurement+0x293/0x530 security/integrity/ima/ima_api.c:254 process_measurement+0x1038/0x1d60 security/integrity/ima/ima_main.c:337 ima_file_check+0xf3/0x180 security/integrity/ima/ima_main.c:519 do_open fs/namei.c:3540 [inline] path_openat+0x2745/0x2f20 fs/namei.c:3672 do_filp_open+0x21c/0x460 fs/namei.c:3699 do_sys_openat2+0x13b/0x500 fs/open.c:1211 do_sys_open fs/open.c:1227 [inline] __do_sys_openat fs/open.c:1243 [inline] __se_sys_openat fs/open.c:1238 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1238 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 RIP: 0033:0x7fb9f8977169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb9f6ee9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fb9f8a96f80 RCX: 00007fb9f8977169 RDX: 0000000000100002 RSI: 0000000020000100 RDI: ffffffffffffff9c RBP: 00007fb9f89d2ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe830d093f R14: 00007fb9f6ee9300 R15: 0000000000022000 Allocated by task 11883: 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 copy_namespaces+0x365/0x3b0 kernel/nsproxy.c:178 copy_process+0x1841/0x3ef0 kernel/fork.c:2201 kernel_clone+0x210/0x960 kernel/fork.c:2601 __do_sys_clone kernel/fork.c:2718 [inline] __se_sys_clone kernel/fork.c:2702 [inline] __x64_sys_clone+0x23f/0x290 kernel/fork.c:2702 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 ffff88807eb9b480 which belongs to the cache net_namespace of size 6464 The buggy address is located 600 bytes inside of 6464-byte region [ffff88807eb9b480, ffff88807eb9cdc0) The buggy address belongs to the page: page:ffffea0001fae600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807eb99a40 pfn:0x7eb98 head:ffffea0001fae600 order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff888023b9bac1 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 0000000100000001 ffff888011dc63c0 raw: ffff88807eb99a40 0000000080040001 00000001ffffffff ffff888023b9bac1 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 3618, ts 73628179045, free_ts 73598820162 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] __kmalloc_track_caller+0x11e/0x300 mm/slub.c:4925 kvasprintf+0xd6/0x180 lib/kasprintf.c:25 kobject_set_name_vargs+0x5d/0x110 lib/kobject.c:297 kobject_add_varg lib/kobject.c:392 [inline] kobject_init_and_add+0xda/0x190 lib/kobject.c:481 netdev_queue_add_kobject net/core/net-sysfs.c:1666 [inline] netdev_queue_update_kobjects+0x186/0x3f0 net/core/net-sysfs.c:1711 register_queue_kobjects net/core/net-sysfs.c:1772 [inline] netdev_register_kobject+0x263/0x310 net/core/net-sysfs.c:2018 register_netdevice+0x1067/0x1700 net/core/dev.c:10327 Memory state around the buggy address: ffff88807eb9b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807eb9b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88807eb9b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807eb9b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807eb9b780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 e8 add %ch,%al 4: 43 rex.XB 5: 64 2d 00 4c 8b 3c fs sub $0x3c8b4c00,%eax b: 24 4d and $0x4d,%al d: 85 e4 test %esp,%esp f: 48 bb 00 00 00 00 00 movabs $0xdffffc0000000000,%rbx 16: fc ff df 19: 75 07 jne 0x22 1b: e8 2b 64 2d 00 callq 0x2d644b 20: eb 06 jmp 0x28 22: e8 24 64 2d 00 callq 0x2d644b 27: fb sti 28: 31 ff xor %edi,%edi * 2a: 44 89 f6 mov %r14d,%esi <-- trapping instruction 2d: e8 79 67 2d 00 callq 0x2d67ab 32: 45 85 f6 test %r14d,%r14d 35: 0f 95 c0 setne %al 38: 48 rex.W 39: c7 .byte 0xc7 3a: 44 24 20 rex.R and $0x20,%al 3d: 0e (bad) 3e: 36 ss 3f: e0 .byte 0xe0