==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88807a21082a by task syz.4.2541/12935
CPU: 0 PID: 12935 Comm: syz.4.2541 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
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:unwind_next_frame+0xa0b/0x1d90 arch/x86/kernel/unwind_orc.c:-1
Code: 08 4c 89 f7 e8 66 b1 87 00 4d 89 3e 48 8b 44 24 40 42 80 3c 28 00 4c 8b 74 24 38 4c 8b 7c 24 70 74 08 4c 89 f7 e8 45 b1 87 00 <48> 8b 44 24 08 49 89 06 48 8b 44 24 68 42 0f b6 04 28 84 c0 4c 8b
RSP: 0018:ffffc9000380ebc8 EFLAGS: 00000246
RAX: 1ffff92000701d98 RBX: ffffc9000380ec88 RCX: 1ffff92000701d01
RDX: 1ffffffff1ced180 RSI: ffffffff8e768bc6 RDI: ffffc9000380ff50
RBP: ffffc9000380ecd0 R08: 000000000000000b R09: 000000000000000d
R10: fffff52000701d9d R11: 1ffff92000701d9b R12: 1ffffffff1ced180
R13: dffffc0000000000 R14: ffffc9000380ecc0 R15: ffffc9000380ecbd
arch_stack_walk+0x10c/0x140 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
save_stack+0xf3/0x1e0 mm/page_owner.c:119
__set_page_owner+0x41/0x2d0 mm/page_owner.c:181
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:5487
alloc_pages_vma+0x393/0x7c0 mm/mempolicy.c:2146
shmem_alloc_page mm/shmem.c:1586 [inline]
shmem_alloc_and_acct_page+0x427/0xb70 mm/shmem.c:1611
shmem_getpage_gfp+0x14f4/0x2d40 mm/shmem.c:1906
shmem_fault+0x1a9/0x520 mm/shmem.c:2118
__do_fault+0x141/0x330 mm/memory.c:3928
do_read_fault mm/memory.c:4264 [inline]
do_fault mm/memory.c:4392 [inline]
handle_pte_fault mm/memory.c:4650 [inline]
__handle_mm_fault mm/memory.c:4785 [inline]
handle_mm_fault+0x2949/0x43c0 mm/memory.c:4883
faultin_page mm/gup.c:976 [inline]
__get_user_pages+0x93e/0x11c0 mm/gup.c:1197
populate_vma_page_range+0x213/0x290 mm/gup.c:1529
__mm_populate+0x26f/0x3a0 mm/gup.c:1638
mm_populate include/linux/mm.h:2646 [inline]
vm_mmap_pgoff+0x203/0x2b0 mm/util.c:556
ksys_mmap_pgoff+0x140/0x780 mm/mmap.c:1635
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: 0033:0x7fa8e26a2ec9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa8e090a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fa8e28f9fa0 RCX: 00007fa8e26a2ec9
RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000
RBP: 00007fa8e2725f91 R08: ffffffffffffffff R09: 0000000000000000
R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8e28fa038 R14: 00007fa8e28f9fa0 R15: 00007ffeb5038228
Allocated by task 12911:
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_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
pfkey_send_acquire+0x5fb/0x2d70 net/key/af_key.c:3186
km_query+0xe3/0x1d0 net/xfrm/xfrm_state.c:2250
xfrm_state_find+0x1f5c/0x2a80 net/xfrm/xfrm_state.c:1164
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2420 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2465 [inline]
xfrm_resolve_and_create_bundle+0x723/0x2b00 net/xfrm/xfrm_policy.c:2760
xfrm_lookup_with_ifid+0x268/0x1fd0 net/xfrm/xfrm_policy.c:3094
xfrm_lookup net/xfrm/xfrm_policy.c:3223 [inline]
xfrm_lookup_route+0x38/0x1a0 net/xfrm/xfrm_policy.c:3234
rawv6_sendmsg+0xc1c/0x1710 net/ipv6/raw.c:933
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
__sys_sendmmsg+0x27c/0x4a0 net/socket.c:2576
__do_sys_sendmmsg net/socket.c:2605 [inline]
__se_sys_sendmmsg net/socket.c:2602 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2602
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
Freed by task 12911:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x6fe/0x850 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
kfree_skb_reason+0xaf/0x110 net/core/skbuff.c:776
kfree_skb include/linux/skbuff.h:1118 [inline]
pfkey_broadcast+0x384/0x3a0 net/key/af_key.c:266
km_query+0xe3/0x1d0 net/xfrm/xfrm_state.c:2250
xfrm_state_find+0x1f5c/0x2a80 net/xfrm/xfrm_state.c:1164
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2420 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2465 [inline]
xfrm_resolve_and_create_bundle+0x723/0x2b00 net/xfrm/xfrm_policy.c:2760
xfrm_lookup_with_ifid+0x268/0x1fd0 net/xfrm/xfrm_policy.c:3094
xfrm_lookup net/xfrm/xfrm_policy.c:3223 [inline]
xfrm_lookup_route+0x38/0x1a0 net/xfrm/xfrm_policy.c:3234
rawv6_sendmsg+0xc1c/0x1710 net/ipv6/raw.c:933
sock_sendmsg_nosec net/socket.c:704 [inline]
__sock_sendmsg net/socket.c:716 [inline]
____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436
___sys_sendmsg+0x1f0/0x260 net/socket.c:2490
__sys_sendmmsg+0x27c/0x4a0 net/socket.c:2576
__do_sys_sendmmsg net/socket.c:2605 [inline]
__se_sys_sendmmsg net/socket.c:2602 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2602
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
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x182/0x930 kernel/rcu/tree.c:3091
__key_link+0x146/0x300 security/keys/keyring.c:1375
__key_instantiate_and_link+0x366/0x4c0 security/keys/key.c:460
key_create_or_update+0x845/0x9a0 security/keys/key.c:937
__do_sys_add_key security/keys/keyctl.c:134 [inline]
__se_sys_add_key+0x333/0x3f0 security/keys/keyctl.c:74
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 ffff88807a210800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff88807a210800, ffff88807a210a00)
The buggy address belongs to the page:
page:ffffea0001e88400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7a210
head:ffffea0001e88400 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888016841c80
raw: 0000000000000000 0000000000100010 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 3561, ts 24183546794, free_ts 21240976556
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:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
slab_alloc mm/slub.c:3233 [inline]
kmem_cache_alloc_trace+0x1a5/0x2a0 mm/slub.c:3250
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:735 [inline]
kernfs_fop_open+0x3da/0xbf0 fs/kernfs/file.c:628
do_dentry_open+0x7ff/0xf80 fs/open.c:826
do_open fs/namei.c:3608 [inline]
path_openat+0x2682/0x2f30 fs/namei.c:3742
do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
do_sys_openat2+0x142/0x4a0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1280
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
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_contig_range+0x96/0xf0 mm/page_alloc.c:9406
destroy_args+0x100/0xa20 mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x318/0x370 mm/debug_vm_pgtable.c:1336
do_one_initcall+0x1ee/0x680 init/main.c:1302
do_initcall_level+0x137/0x1f0 init/main.c:1375
do_initcalls+0x4b/0x90 init/main.c:1391
kernel_init_freeable+0x3ce/0x560 init/main.c:1615
kernel_init+0x19/0x1b0 init/main.c:1506
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Memory state around the buggy address:
ffff88807a210700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807a210780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807a210800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807a210880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807a210900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 08 4c 89 f7 or %cl,-0x9(%rcx,%rcx,4)
4: e8 66 b1 87 00 call 0x87b16f
9: 4d 89 3e mov %r15,(%r14)
c: 48 8b 44 24 40 mov 0x40(%rsp),%rax
11: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
16: 4c 8b 74 24 38 mov 0x38(%rsp),%r14
1b: 4c 8b 7c 24 70 mov 0x70(%rsp),%r15
20: 74 08 je 0x2a
22: 4c 89 f7 mov %r14,%rdi
25: e8 45 b1 87 00 call 0x87b16f
* 2a: 48 8b 44 24 08 mov 0x8(%rsp),%rax <-- trapping instruction
2f: 49 89 06 mov %rax,(%r14)
32: 48 8b 44 24 68 mov 0x68(%rsp),%rax
37: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
3c: 84 c0 test %al,%al
3e: 4c rex.WR
3f: 8b .byte 0x8b