==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88807d122c2a by task syz-executor/9320
CPU: 0 PID: 9320 Comm: syz-executor Not tainted 5.15.181-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:558
__do_softirq kernel/softirq.c:592 [inline]
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:641
irq_exit_rcu+0x5/0x20 kernel/softirq.c:653
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:extract_string fs/d_path.c:21 [inline]
RIP: 0010:d_absolute_path+0xc5/0x140 fs/d_path.c:237
Code: f3 ff ff 89 c3 bf 01 00 00 00 89 c6 e8 74 82 a2 ff 83 fb 02 73 44 8b 5c 24 08 bf ff ff ff ff 89 de e8 5f 82 a2 ff 85 db 78 3e f6 7e a2 ff 48 8b 04 24 65 48 8b 0c 25 28 00 00 00 48 3b 4c 24
RSP: 0018:ffffc900033af8e0 EFLAGS: 00000202
RAX: ffffffff81d53f11 RBX: 0000000000000fea RCX: ffff88802a29d940
RDX: 0000000000000000 RSI: 0000000000000fea RDI: 00000000ffffffff
RBP: 0000000000000ffd R08: dffffc0000000000 R09: fffffbfff1ad155e
R10: fffffbfff1ad155e R11: 1ffffffff1ad155d R12: 0000000000001000
R13: dffffc0000000000 R14: ffff88801af9cffd R15: 0000000000000ffe
tomoyo_get_absolute_path security/tomoyo/realpath.c:101 [inline]
tomoyo_realpath_from_path+0x331/0x610 security/tomoyo/realpath.c:276
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x1cd/0x510 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x120 security/security.c:1348
vfs_getattr+0x26/0x3a0 fs/stat.c:157
vfs_statx+0x149/0x4d0 fs/stat.c:225
vfs_fstatat fs/stat.c:243 [inline]
__do_sys_newfstatat fs/stat.c:411 [inline]
__se_sys_newfstatat fs/stat.c:405 [inline]
__x64_sys_newfstatat+0x12c/0x1b0 fs/stat.c:405
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3749bb417a
Code: 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 0b 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 90 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7
RSP: 002b:00007ffe07bff338 EFLAGS: 00000286 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007f3749c3789d RCX: 00007f3749bb417a
RDX: 00007ffe07bff360 RSI: 00007ffe07bff3f0 RDI: 00000000ffffff9c
RBP: 00007ffe07bff3f0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000100 R11: 0000000000000286 R12: 00007ffe07c00480
R13: 00007f3749c3789d R14: 0000000000069c43 R15: 00007ffe07c004c0
Allocated by task 7133:
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_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:604 [inline]
rose_add_node+0x227/0xdb0 net/rose/rose_route.c:85
rose_rt_ioctl+0x9db/0xe20 net/rose/rose_route.c:745
rose_ioctl+0x27a/0x790 net/rose/af_rose.c:1372
sock_do_ioctl+0xd3/0x2f0 net/socket.c:1140
sock_ioctl+0x4ed/0x6e0 net/socket.c:1257
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff88807d122c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88807d122c00, ffff88807d122e00)
The buggy address belongs to the page:
page:ffffea0001f44800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807d122800 pfn:0x7d120
head:ffffea0001f44800 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00008d3d08 ffffea000088ba08 ffff888016841c80
raw: ffff88807d122800 0000000000100003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4166, ts 52650653121, free_ts 17856596415
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
__alloc_pages+0x1e1/0x470 mm/page_alloc.c:5466
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1975
___slab_alloc+0x81e/0xdf0 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]
__kmalloc+0x1cd/0x330 mm/slub.c:4403
kmalloc include/linux/slab.h:609 [inline]
kzalloc include/linux/slab.h:735 [inline]
new_dir fs/proc/proc_sysctl.c:955 [inline]
get_subdir fs/proc/proc_sysctl.c:1000 [inline]
__register_sysctl_table+0xa1f/0x1230 fs/proc/proc_sysctl.c:1349
__addrconf_sysctl_register+0x268/0x3d0 net/ipv6/addrconf.c:7104
addrconf_sysctl_register+0x15c/0x1b0 net/ipv6/addrconf.c:7151
ipv6_add_dev+0xbf3/0x1190 net/ipv6/addrconf.c:454
addrconf_notify+0x66f/0xf00 net/ipv6/addrconf.c:3579
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2061 [inline]
call_netdevice_notifiers net/core/dev.c:2075 [inline]
register_netdevice+0x1275/0x16b0 net/core/dev.c:10428
veth_newlink+0x8ed/0xda0 drivers/net/veth.c:1714
__rtnl_newlink net/core/rtnetlink.c:3524 [inline]
rtnl_newlink+0x114c/0x17d0 net/core/rtnetlink.c:3572
rtnetlink_rcv_msg+0x9b9/0xe60 net/core/rtnetlink.c:5650
netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2489
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+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x94/0x280 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1a5/0x200 mm/slub.c:2507
put_cpu_partial+0x12d/0x190 mm/slub.c:2587
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
slab_alloc mm/slub.c:3228 [inline]
kmem_cache_alloc+0x100/0x290 mm/slub.c:3233
getname_flags+0xb5/0x500 fs/namei.c:138
user_path_at_empty+0x2a/0x190 fs/namei.c:2882
do_readlinkat+0xd4/0x480 fs/stat.c:442
__do_sys_readlink fs/stat.c:475 [inline]
__se_sys_readlink fs/stat.c:472 [inline]
__x64_sys_readlink+0x7b/0x90 fs/stat.c:472
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Memory state around the buggy address:
ffff88807d122b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807d122b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807d122c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807d122c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807d122d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f3 ff repz (bad)
2: ff 89 c3 bf 01 00 decl 0x1bfc3(%rcx)
8: 00 00 add %al,(%rax)
a: 89 c6 mov %eax,%esi
c: e8 74 82 a2 ff call 0xffa28285
11: 83 fb 02 cmp $0x2,%ebx
14: 73 44 jae 0x5a
16: 8b 5c 24 08 mov 0x8(%rsp),%ebx
1a: bf ff ff ff ff mov $0xffffffff,%edi
1f: 89 de mov %ebx,%esi
21: e8 5f 82 a2 ff call 0xffa28285
26: 85 db test %ebx,%ebx
28: 78 3e js 0x68
* 2a: e8 f6 7e a2 ff call 0xffa27f25 <-- trapping instruction
2f: 48 8b 04 24 mov (%rsp),%rax
33: 65 48 8b 0c 25 28 00 mov %gs:0x28,%rcx
3a: 00 00
3c: 48 rex.W
3d: 3b .byte 0x3b
3e: 4c rex.WR
3f: 24 .byte 0x24