================================================================== BUG: KASAN: slab-out-of-bounds in tcp_probe_timer net/ipv4/tcp_timer.c:360 [inline] BUG: KASAN: slab-out-of-bounds in tcp_write_timer_handler+0x8c6/0x8d0 net/ipv4/tcp_timer.c:596 Read of size 4 at addr ffff88809c8c2654 by task syz-executor.4/23599 CPU: 0 PID: 23599 Comm: syz-executor.4 Not tainted 5.3.0-rc5+ #142 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:830 RIP: 0010:write_comp_data+0x1e/0x70 kernel/kcov.c:123 Code: 48 89 34 d1 48 89 11 5d c3 0f 1f 00 65 4c 8b 04 25 40 fe 01 00 65 8b 05 78 8c 8f 7e a9 00 01 1f 00 75 51 41 8b 80 f0 12 00 00 <83> f8 03 75 45 49 8b 80 f8 12 00 00 45 8b 80 f4 12 00 00 4c 8b 08 RSP: 0018:ffff8880996c7858 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff83060c52 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: ffff8880996c7860 R08: ffff88809fa4e2c0 R09: ffffed10132d8f23 R10: ffffed10132d8f22 R11: 0000000000000000 R12: ffff888097227600 R13: 0000000000000004 R14: 000000000000000b R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x312/0x540 security/tomoyo/util.c:1069 tomoyo_supervisor+0x2e8/0xef0 security/tomoyo/common.c:2087 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x263/0x360 security/tomoyo/file.c:573 tomoyo_path_perm+0x31d/0x430 security/tomoyo/file.c:838 tomoyo_path_unlink+0x9b/0xe0 security/tomoyo/tomoyo.c:156 security_path_unlink+0xfa/0x160 security/security.c:1004 do_unlinkat+0x3b7/0x6d0 fs/namei.c:4060 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459577 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff96aa4148 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000459577 RDX: 00007fff96aa4160 RSI: 00007fff96aa4160 RDI: 00007fff96aa41f0 RBP: 0000000000000111 R08: 0000000000000000 R09: 000000000000000b R10: 0000000000000006 R11: 0000000000000246 R12: 00007fff96aa5280 R13: 0000555556d79940 R14: 0000000000000000 R15: 00007fff96aa5280 Allocated by task 23702: 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_renameat2+0x199/0xc40 fs/namei.c:4545 __do_sys_rename fs/namei.c:4673 [inline] __se_sys_rename fs/namei.c:4671 [inline] __x64_sys_rename+0x61/0x80 fs/namei.c:4671 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 23702: 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_renameat2+0x2b4/0xc40 fs/namei.c:4649 __do_sys_rename fs/namei.c:4673 [inline] __se_sys_rename fs/namei.c:4671 [inline] __x64_sys_rename+0x61/0x80 fs/namei.c:4671 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 ffff88809c8c2900 which belongs to the cache names_cache of size 4096 The buggy address is located 684 bytes to the left of 4096-byte region [ffff88809c8c2900, ffff88809c8c3900) The buggy address belongs to the page: page:ffffea0002723080 refcount:1 mapcount:0 mapping:ffff88821bc46380 index:0x0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00019a9188 ffffea0002296008 ffff88821bc46380 raw: 0000000000000000 ffff88809c8c2900 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809c8c2500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809c8c2580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88809c8c2600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88809c8c2680: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88809c8c2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================