================================================================== BUG: KASAN: use-after-free in tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] BUG: KASAN: use-after-free in tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 Read of size 4 at addr ffff88808fd608d0 by task udevd/3828 CPU: 0 PID: 3828 Comm: udevd Not tainted 5.2.0+ #67 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0xd4/0x306 mm/kasan/report.c:351 __kasan_report.cold+0x1b/0x36 mm/kasan/report.c:482 kasan_report+0x12/0x17 mm/kasan/common.c:612 __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:131 tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 tcp_write_timer+0xa8/0x1e0 net/ipv4/tcp_timer.c:612 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698 __do_softirq+0x262/0x98c kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x19b/0x1e0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:767 [inline] RIP: 0010:kmem_cache_free+0xab/0x320 mm/slab.c:3694 Code: e8 1a 27 00 00 84 c0 74 77 41 f7 c6 00 02 00 00 74 4f e8 d8 b3 cb ff 48 83 3d 20 a3 26 07 00 0f 84 fa 01 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 8b 6d 08 0f 1f 44 00 00 65 8b 05 40 46 55 7e 83 RSP: 0018:ffff88808a2f7928 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff88808bd12cb0 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000286 RBP: ffff88808a2f7948 R08: 1ffffffff14a7750 R09: fffffbfff14a7751 R10: fffffbfff14a7750 R11: ffffffff8a53ba87 R12: ffff88821bc42700 R13: ffffffff81a222ca R14: 0000000000000286 R15: ffff88809aef82b8 anon_vma_chain_free mm/rmap.c:134 [inline] unlink_anon_vmas+0x2ba/0x860 mm/rmap.c:401 free_pgtables+0x1af/0x2f0 mm/memory.c:395 exit_mmap+0x2c9/0x530 mm/mmap.c:3146 __mmput kernel/fork.c:1064 [inline] mmput+0x179/0x4d0 kernel/fork.c:1085 exec_mmap fs/exec.c:1047 [inline] flush_old_exec+0x8c2/0x1e90 fs/exec.c:1280 load_elf_binary+0xa64/0x5730 fs/binfmt_elf.c:867 search_binary_handler fs/exec.c:1658 [inline] search_binary_handler+0x16d/0x570 fs/exec.c:1635 exec_binprm fs/exec.c:1701 [inline] __do_execve_file.isra.0+0x1333/0x2340 fs/exec.c:1821 do_execveat_common fs/exec.c:1868 [inline] do_execve fs/exec.c:1885 [inline] __do_sys_execve fs/exec.c:1961 [inline] __se_sys_execve fs/exec.c:1956 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1956 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7eff52faa207 Code: Bad RIP value. RSP: 002b:00007ffcc3c78da8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 00007eff52faa207 RDX: 00000000008be200 RSI: 00007ffcc3c78ea0 RDI: 00007ffcc3c79eb0 RBP: 0000000000625500 R08: 0000000000000558 R09: 0000000000000558 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000008be200 R13: 0000000000000007 R14: 00000000008ac250 R15: 0000000000000005 Allocated by task 3424: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc mm/kasan/common.c:487 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:460 kasan_slab_alloc+0xf/0x20 mm/kasan/common.c:495 slab_post_alloc_hook mm/slab.h:520 [inline] slab_alloc mm/slab.c:3319 [inline] kmem_cache_alloc+0x121/0x710 mm/slab.c:3483 getname_flags fs/namei.c:138 [inline] getname_flags+0xd6/0x5b0 fs/namei.c:128 getname fs/namei.c:209 [inline] do_symlinkat+0x8b/0x290 fs/namei.c:4143 __do_sys_symlink fs/namei.c:4173 [inline] __se_sys_symlink fs/namei.c:4171 [inline] __x64_sys_symlink+0x59/0x80 fs/namei.c:4171 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 3424: save_stack+0x23/0x90 mm/kasan/common.c:69 set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:449 kasan_slab_free+0xe/0x10 mm/kasan/common.c:457 __cache_free mm/slab.c:3425 [inline] kmem_cache_free+0x86/0x320 mm/slab.c:3693 putname+0xef/0x130 fs/namei.c:259 do_symlinkat+0x181/0x290 fs/namei.c:4161 __do_sys_symlink fs/namei.c:4173 [inline] __se_sys_symlink fs/namei.c:4171 [inline] __x64_sys_symlink+0x59/0x80 fs/namei.c:4171 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808fd60300 which belongs to the cache names_cache of size 4096 The buggy address is located 1488 bytes inside of 4096-byte region [ffff88808fd60300, ffff88808fd61300) The buggy address belongs to the page: page:ffffea00023f5800 refcount:1 mapcount:0 mapping:ffff88821bc46380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00023f5908 ffffea0002566f88 ffff88821bc46380 raw: 0000000000000000 ffff88808fd60300 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808fd60780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808fd60800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808fd60880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808fd60900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808fd60980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================