================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:500 Read of size 8 at addr ffff888047e92450 by task systemd-udevd/25949 CPU: 0 PID: 25949 Comm: systemd-udevd Not tainted 5.9.0-rc1-syzkaller #0 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+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:500 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:611 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:631 call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1413 expire_timers kernel/time/timer.c:1458 [inline] __run_timers.part.0+0x67c/0xaa0 kernel/time/timer.c:1755 __run_timers kernel/time/timer.c:1736 [inline] run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1768 __do_softirq+0x2de/0xa24 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x1f3/0x230 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:581 RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 kernel/kcov.c:197 Code: fe 01 00 65 8b 05 10 96 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 44 14 00 00 85 c0 74 2b 8b 82 20 14 00 00 <83> f8 02 75 20 48 8b 8a 28 14 00 00 8b 92 24 14 00 00 48 8b 01 48 RSP: 0018:ffffc900060775a8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000006 RCX: ffffffff8366f4f7 RDX: ffff88806aff6280 RSI: ffffffff8366f50a RDI: 0000000000000005 RBP: ffff8880972a5b80 R08: 0000000000000001 R09: ffffffff8cb27747 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000002 R13: 0000000000000301 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x31a/0x550 security/tomoyo/util.c:1070 tomoyo_supervisor+0x2d4/0xeb0 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x25c/0x360 security/tomoyo/file.c:573 tomoyo_check_open_permission+0x33e/0x380 security/tomoyo/file.c:777 tomoyo_file_open security/tomoyo/tomoyo.c:313 [inline] tomoyo_file_open+0xa3/0xd0 security/tomoyo/tomoyo.c:308 security_file_open+0x52/0x4f0 security/security.c:1574 do_dentry_open+0x358/0x11b0 fs/open.c:804 do_open fs/namei.c:3251 [inline] path_openat+0x1b9a/0x2730 fs/namei.c:3368 do_filp_open+0x17e/0x3c0 fs/namei.c:3395 do_sys_openat2+0x16d/0x420 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f41ebb42840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffe82a8f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000055d217b098f0 RCX: 00007f41ebb42840 RDX: 000055d217a9dfe3 RSI: 00000000000a0800 RDI: 000055d217b09770 RBP: 00007ffe82a8f240 R08: 000055d217a9d670 R09: 0000000000000010 R10: 000055d217a9dd0c R11: 0000000000000246 R12: 00007ffe82a8f190 R13: 000055d217b044a0 R14: 0000000000000003 R15: 000000000000000e Allocated by task 6853: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:518 [inline] slab_alloc mm/slab.c:3312 [inline] kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags fs/namei.c:2646 [inline] user_path_at_empty+0xa1/0x100 fs/namei.c:2646 user_path_at include/linux/namei.h:59 [inline] ksys_umount fs/namespace.c:1751 [inline] __do_sys_umount fs/namespace.c:1759 [inline] __se_sys_umount fs/namespace.c:1757 [inline] __x64_sys_umount+0xdc/0x150 fs/namespace.c:1757 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 6853: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3418 [inline] kmem_cache_free.part.0+0x67/0x1f0 mm/slab.c:3693 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3b1/0x560 fs/namei.c:2376 user_path_at include/linux/namei.h:59 [inline] ksys_umount fs/namespace.c:1751 [inline] __do_sys_umount fs/namespace.c:1759 [inline] __se_sys_umount fs/namespace.c:1757 [inline] __x64_sys_umount+0xdc/0x150 fs/namespace.c:1757 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff888047e92800 which belongs to the cache names_cache of size 4096 The buggy address is located 944 bytes to the left of 4096-byte region [ffff888047e92800, ffff888047e93800) The buggy address belongs to the page: page:00000000f2183fc7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47e92 head:00000000f2183fc7 order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea00016a7208 ffffea00016ea088 ffff8880aa241c00 raw: 0000000000000000 ffff888047e92800 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888047e92300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888047e92380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888047e92400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888047e92480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888047e92500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================