================================================================== BUG: KASAN: slab-out-of-bounds in tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:499 Read of size 8 at addr ffff888045372250 by task systemd-udevd/873 CPU: 1 PID: 873 Comm: systemd-udevd Not tainted 5.9.0-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+0x198/0x1fb lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 tcp_retransmit_timer+0x2d30/0x3220 net/ipv4/tcp_timer.c:499 tcp_write_timer_handler+0x79b/0xa60 net/ipv4/tcp_timer.c:610 tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:630 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1415 expire_timers kernel/time/timer.c:1460 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1757 __run_timers kernel/time/timer.c:1738 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1770 __do_softirq+0x203/0xac5 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/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+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:write_comp_data+0x2f/0x80 kernel/kcov.c:218 Code: 05 76 cd 8c 7e 65 48 8b 34 25 c0 fe 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 54 14 00 00 85 c0 74 4f 8b 86 30 14 00 00 <83> f8 03 75 44 48 8b 86 38 14 00 00 8b b6 34 14 00 00 4c 8b 00 48 RSP: 0018:ffffc90001b078f8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffffffff8384542a RDX: 0000000000000005 RSI: ffff88806bd20300 RDI: 0000000000000001 RBP: ffff8880a849ff00 R08: 0000000000000001 R09: ffffffff8dc5c3a7 R10: 0000000000000010 R11: 0000000000000000 R12: 0000000000000002 R13: 00000000000001ac R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x32a/0x550 security/tomoyo/util.c:1087 tomoyo_supervisor+0x2f2/0xef0 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+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2f0/0x400 security/tomoyo/file.c:838 security_inode_getattr+0xcf/0x140 security/security.c:1279 vfs_getattr fs/stat.c:121 [inline] vfs_statx_fd+0x70/0xf0 fs/stat.c:151 vfs_fstat include/linux/fs.h:3142 [inline] __do_sys_newfstat+0x88/0x100 fs/stat.c:398 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fc8665512e2 Code: 48 8b 05 b9 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 77 33 48 63 fe b8 05 00 00 00 48 89 d6 0f 05 <48> 3d 00 f0 ff ff 77 06 f3 c3 0f 1f 40 00 48 8b 15 81 db 2b 00 f7 RSP: 002b:00007ffe25722d58 EFLAGS: 00000246 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 00007fc86680c440 RCX: 00007fc8665512e2 RDX: 00007ffe25722d60 RSI: 00007ffe25722d60 RDI: 000000000000000f RBP: 000055d962ffd610 R08: 0000000000000b40 R09: 000055d962ffdad0 R10: 000055d962ffd610 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000001000 R14: 000055d962ffdad0 R15: 00007ffe25723020 Allocated by task 3929: 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:530 [inline] slab_alloc mm/slab.c:3314 [inline] kmem_cache_alloc+0x139/0x3d0 mm/slab.c:3484 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 do_readlinkat+0xcd/0x2f0 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:446 [inline] __se_sys_readlinkat fs/stat.c:443 [inline] __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:443 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3929: 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:3420 [inline] kmem_cache_free.part.0+0x74/0x1d0 mm/slab.c:3695 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3b1/0x560 fs/namei.c:2376 do_readlinkat+0xcd/0x2f0 fs/stat.c:419 __do_sys_readlinkat fs/stat.c:446 [inline] __se_sys_readlinkat fs/stat.c:443 [inline] __x64_sys_readlinkat+0x93/0xf0 fs/stat.c:443 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 ffff888045372b40 which belongs to the cache names_cache of size 4096 The buggy address is located 2288 bytes to the left of 4096-byte region [ffff888045372b40, ffff888045373b40) The buggy address belongs to the page: page:0000000054d01abb refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45372 head:0000000054d01abb order:1 compound_mapcount:0 flags: 0xfffe0000010200(slab|head) raw: 00fffe0000010200 ffffea0001acf208 ffffea0001869a08 ffff8880aa2a8d00 raw: 0000000000000000 ffff888045372b40 0000000100000001 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888045372100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888045372180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888045372200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888045372280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888045372300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================