==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802453f42a by task kworker/u8:2/12965
CPU: 0 UID: 0 PID: 12965 Comm: kworker/u8:2 Not tainted 6.15.0-rc5-syzkaller-00126-gea9a83d7f371 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xb4/0x290 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:869 [inline]
RIP: 0010:aa_file_perm+0x317/0xed0 security/apparmor/file.c:599
Code: fc 49 fd e8 7b 3a e0 06 89 c3 31 ff 89 c6 e8 b0 00 4a fd 85 db 49 bf 00 00 00 00 00 fc ff df 74 13 e8 8d 23 31 fd 84 c0 74 14 54 fc 49 fd e9 b2 00 00 00 e8 4a fc 49 fd e9 a8 00 00 00 e8 40
RSP: 0000:ffffc9000b5ffac0 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 85abc05ef7d99300
RDX: ffff88802077da00 RSI: ffffffff8bc1d240 RDI: ffffffff8bc1d200
RBP: ffffc9000b5ffc28 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8475d1ff R12: 0000000000010005
R13: ffffffff8475d1ff R14: 0000000000000002 R15: dffffc0000000000
common_file_perm+0x18f/0x200 security/apparmor/lsm.c:533
security_file_permission+0x91/0x290 security/security.c:2844
rw_verify_area+0xba/0x650 fs/read_write.c:471
kernel_read+0x2d/0x70 fs/read_write.c:543
prepare_binprm fs/exec.c:1717 [inline]
search_binary_handler fs/exec.c:1764 [inline]
exec_binprm fs/exec.c:1810 [inline]
bprm_execve+0x8ce/0x1440 fs/exec.c:1862
kernel_execve+0x8f0/0x9f0 fs/exec.c:2028
call_usermodehelper_exec_async+0x210/0x360 kernel/umh.c:109
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 12152:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
device_private_init drivers/base/core.c:3537 [inline]
device_add+0xbe/0xb50 drivers/base/core.c:3588
netdev_register_kobject+0x156/0x2f0 net/core/net-sysfs.c:2336
register_netdevice+0x126c/0x1af0 net/core/dev.c:10997
register_netdev+0x40/0x60 net/core/dev.c:11114
loopback_net_init+0x75/0x150 drivers/net/loopback.c:218
ops_init+0x359/0x5c0 net/core/net_namespace.c:138
setup_net+0x238/0x830 net/core/net_namespace.c:364
copy_net_ns+0x32e/0x590 net/core/net_namespace.c:518
create_new_namespaces+0x3d3/0x700 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:228
ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3375
__do_sys_unshare kernel/fork.c:3446 [inline]
__se_sys_unshare kernel/fork.c:3444 [inline]
__x64_sys_unshare+0x38/0x50 kernel/fork.c:3444
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5894:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free mm/slub.c:4642 [inline]
kfree+0x193/0x440 mm/slub.c:4841
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x480 lib/kobject.c:737
netdev_run_todo+0xd2e/0xea0 net/core/dev.c:11305
default_device_exit_batch+0x81e/0x890 net/core/dev.c:12529
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x7a9/0xbd0 net/core/net_namespace.c:654
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88802453f400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88802453f400, ffff88802453f600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802453f800 pfn:0x2453c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a041c80 ffffea0001fa3110 ffffea0000a04010
raw: ffff88802453f800 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a041c80 ffffea0001fa3110 ffffea0000a04010
head: ffff88802453f800 000000000010000b 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000914f01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 5894, tgid 5894 (kworker/u8:8), ts 77933317406, free_ts 77687261845
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2618
new_slab mm/slub.c:2672 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
__slab_alloc mm/slub.c:3948 [inline]
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
mca_alloc net/ipv6/mcast.c:884 [inline]
__ipv6_dev_mc_inc+0x420/0xaf0 net/ipv6/mcast.c:975
addrconf_join_solict net/ipv6/addrconf.c:2242 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4103 [inline]
addrconf_dad_work+0x3d0/0x14b0 net/ipv6/addrconf.c:4231
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 5832 tgid 5832 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
__slab_free+0x326/0x400 mm/slub.c:4553
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x224/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
tomoyo_encode2 security/tomoyo/realpath.c:45 [inline]
tomoyo_encode+0x28b/0x550 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x58d/0x5d0 security/tomoyo/realpath.c:283
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1e8/0x5a0 security/tomoyo/file.c:723
security_file_ioctl+0xcb/0x2d0 security/security.c:2913
__do_sys_ioctl fs/ioctl.c:900 [inline]
__se_sys_ioctl+0x47/0x170 fs/ioctl.c:892
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802453f300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802453f380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802453f400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802453f480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802453f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: fc cld
1: 49 fd rex.WB std
3: e8 7b 3a e0 06 call 0x6e03a83
8: 89 c3 mov %eax,%ebx
a: 31 ff xor %edi,%edi
c: 89 c6 mov %eax,%esi
e: e8 b0 00 4a fd call 0xfd4a00c3
13: 85 db test %ebx,%ebx
15: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15
1c: fc ff df
1f: 74 13 je 0x34
21: e8 8d 23 31 fd call 0xfd3123b3
26: 84 c0 test %al,%al
28: 74 14 je 0x3e
* 2a: e8 54 fc 49 fd call 0xfd49fc83 <-- trapping instruction
2f: e9 b2 00 00 00 jmp 0xe6
34: e8 4a fc 49 fd call 0xfd49fc83
39: e9 a8 00 00 00 jmp 0xe6
3e: e8 .byte 0xe8
3f: 40 rex