==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805546382a by task udevd/4392
CPU: 0 PID: 4392 Comm: udevd Not tainted 6.1.144-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x220 mm/kasan/report.c:427
kasan_report+0x10b/0x140 mm/kasan/report.c:531
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:unwind_next_frame+0x12a/0x20b0 arch/x86/kernel/unwind_orc.c:448
Code: 00 41 f6 06 03 0f 85 bb 17 00 00 4c 8d 73 35 4c 89 f0 48 c1 e8 03 49 bd 00 00 00 00 00 fc ff df 48 89 44 24 78 42 0f b6 04 28 <84> c0 0f 85 25 19 00 00 4c 89 b4 24 80 00 00 00 45 0f b6 36 48 8b
RSP: 0018:ffffc90004796d70 EFLAGS: 00000a07
RAX: 0000000000000000 RBX: ffffc90004796e48 RCX: ffffffff96be9100
RDX: dffffc0000000000 RSI: ffffffff8a400b52 RDI: ffffffff8138551f
RBP: ffffc90004796e90 R08: ffffc90004796f10 R09: 0000000000000008
R10: fffff520008f2dd5 R11: 1ffff920008f2dd3 R12: ffffffff8a400b52
R13: dffffc0000000000 R14: ffffc90004796e7d R15: ffffc90004796e98
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:127
__set_page_owner+0x19/0x60 mm/page_owner.c:190
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
__folio_alloc+0xe/0x30 mm/page_alloc.c:5646
vma_alloc_folio+0x4a3/0x900 mm/mempolicy.c:2243
alloc_page_vma include/linux/gfp.h:284 [inline]
do_anonymous_page mm/memory.c:4191 [inline]
handle_pte_fault mm/memory.c:5029 [inline]
__handle_mm_fault mm/memory.c:5173 [inline]
handle_mm_fault+0x2242/0x3e70 mm/memory.c:5294
do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166
Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc900047977b8 EFLAGS: 00050206
RAX: ffffffff84059101 RBX: 0000000000001000 RCX: 0000000000001000
RDX: 0000000000001000 RSI: ffff888055ae5000 RDI: 00007f19b4593000
RBP: ffffc90004797918 R08: dffffc0000000000 R09: ffffed100ab5cc00
R10: 0000000000000000 R11: 0000000000000200 R12: 1ffff920008f2fb7
R13: 00007f19b4593000 R14: ffff888055ae5000 R15: 00007fffffffe000
copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline]
raw_copy_to_user arch/x86/include/asm/uaccess_64.h:58 [inline]
copyout lib/iov_iter.c:170 [inline]
_copy_to_iter+0x2b6/0x1030 lib/iov_iter.c:527
copy_page_to_iter+0xac/0x170 lib/iov_iter.c:725
copy_folio_to_iter include/linux/uio.h:172 [inline]
filemap_read+0x2355/0x2f80 mm/filemap.c:2819
blkdev_read_iter+0x3d5/0x500 block/fops.c:614
call_read_iter include/linux/fs.h:2259 [inline]
new_sync_read fs/read_write.c:389 [inline]
vfs_read+0x434/0x920 fs/read_write.c:470
ksys_read+0x143/0x240 fs/read_write.c:613
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f19b3ea7407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffdc49a13b0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f19b45eb880 RCX: 00007f19b3ea7407
RDX: 0000000000040000 RSI: 00007f19b4582000 RDI: 0000000000000009
RBP: 000055570df33060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 000055570df368c8 R15: 00007f19b471239c
Allocated by task 9219:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956
kmalloc_reserve net/core/skbuff.c:446 [inline]
__alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515
alloc_skb include/linux/skbuff.h:1271 [inline]
nlmsg_new include/net/netlink.h:991 [inline]
netlink_ack+0x372/0x1100 net/netlink/af_netlink.c:2430
netlink_rcv_skb+0x263/0x420 net/netlink/af_netlink.c:2499
genl_rcv+0x24/0x40 net/netlink/genetlink.c:861
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x74c/0x8c0 net/netlink/af_netlink.c:1337
netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x44f/0x5c0 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
call_rcu+0x154/0x980 kernel/rcu/tree.c:2849
fib6_info_release include/net/ip6_fib.h:340 [inline]
nsim_rt6_release drivers/net/netdevsim/fib.c:515 [inline]
nsim_fib6_event_fini+0xf5/0x1c0 drivers/net/netdevsim/fib.c:841
nsim_fib_event drivers/net/netdevsim/fib.c:891 [inline]
nsim_fib_event_work+0x2531/0x32b0 drivers/net/netdevsim/fib.c:1494
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
process_scheduled_works kernel/workqueue.c:2355 [inline]
worker_thread+0xd62/0x1250 kernel/workqueue.c:2441
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff888055463800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff888055463800, ffff888055463a00)
The buggy address belongs to the physical page:
page:ffffea0001551800 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888055462400 pfn:0x55460
head:ffffea0001551800 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0000c16008 ffffea0001624b08 ffff888017441c80
raw: ffff888055462400 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 4266, tgid 4266 (syz-executor), ts 80402566399, free_ts 22613122915
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
alloc_slab_page+0x5d/0x160 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1992
___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc_node_track_caller+0x9e/0x230 mm/slab_common.c:956
kmalloc_reserve net/core/skbuff.c:446 [inline]
__alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515
alloc_skb include/linux/skbuff.h:1271 [inline]
nlmsg_new include/net/netlink.h:991 [inline]
netlink_ack+0x372/0x1100 net/netlink/af_netlink.c:2430
netlink_rcv_skb+0x263/0x420 net/netlink/af_netlink.c:2499
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x74c/0x8c0 net/netlink/af_netlink.c:1337
netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x44f/0x5c0 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
free_contig_range+0x9d/0x150 mm/page_alloc.c:9574
destroy_args+0xef/0x8bf mm/debug_vm_pgtable.c:1031
debug_vm_pgtable+0x32a/0x37e mm/debug_vm_pgtable.c:1354
do_one_initcall+0x214/0x7a0 init/main.c:1298
do_initcall_level+0x137/0x1e4 init/main.c:1371
do_initcalls+0x4b/0x8a init/main.c:1387
kernel_init_freeable+0x3fa/0x5ac init/main.c:1626
kernel_init+0x19/0x1b0 init/main.c:1514
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Memory state around the buggy address:
ffff888055463700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888055463780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888055463800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888055463880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888055463900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 41 f6 06 03 testb $0x3,(%r14)
4: 0f 85 bb 17 00 00 jne 0x17c5
a: 4c 8d 73 35 lea 0x35(%rbx),%r14
e: 4c 89 f0 mov %r14,%rax
11: 48 c1 e8 03 shr $0x3,%rax
15: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13
1c: fc ff df
1f: 48 89 44 24 78 mov %rax,0x78(%rsp)
24: 42 0f b6 04 28 movzbl (%rax,%r13,1),%eax
* 29: 84 c0 test %al,%al <-- trapping instruction
2b: 0f 85 25 19 00 00 jne 0x1956
31: 4c 89 b4 24 80 00 00 mov %r14,0x80(%rsp)
38: 00
39: 45 0f b6 36 movzbl (%r14),%r14d
3d: 48 rex.W
3e: 8b .byte 0x8b