==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x45a/0x4d0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805bfe082a by task syz.1.4188/19077
CPU: 0 UID: 0 PID: 19077 Comm: syz.1.4188 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
rose_timer_expiry+0x45a/0x4d0 net/rose/rose_timer.c:183
call_timer_fn+0x197/0x620 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1798 [inline]
__run_timers+0x6ef/0x960 kernel/time/timer.c:2372
__run_timer_base kernel/time/timer.c:2384 [inline]
__run_timer_base kernel/time/timer.c:2376 [inline]
run_timer_base+0x114/0x190 kernel/time/timer.c:2393
run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2403
handle_softirqs+0x216/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 46 5c 01 f6 48 89 df e8 2e b0 01 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 05 af f1 f5 65 8b 05 0e 0c 40 08 85 c0 74 16 5b
RSP: 0018:ffffc9000419f6d0 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffffffff9afc8d48 RCX: ffffffff81c3721f
RDX: 0000000000000000 RSI: ffffffff8de50330 RDI: ffffffff8c162900
RBP: 0000000000000202 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab4c97 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff9afc8d48 R14: 000000000000013a R15: ffff88807f8b6230
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
avc_reclaim_node security/selinux/avc.c:488 [inline]
avc_alloc_node+0x420/0x6a0 security/selinux/avc.c:507
avc_insert security/selinux/avc.c:618 [inline]
avc_compute_av+0x100/0x7f0 security/selinux/avc.c:993
avc_perm_nonode+0xab/0x180 security/selinux/avc.c:1117
avc_has_perm_noaudit+0x2de/0x3b0 security/selinux/avc.c:1160
cred_has_capability.isra.0+0x17b/0x310 security/selinux/hooks.c:1655
security_capable+0xd3/0x260 security/security.c:1142
ns_capable_common kernel/capability.c:342 [inline]
ns_capable kernel/capability.c:363 [inline]
capable_wrt_inode_uidgid+0xd7/0x190 kernel/capability.c:478
generic_permission fs/namei.c:479 [inline]
generic_permission+0x48a/0x7d0 fs/namei.c:464
do_inode_permission fs/namei.c:533 [inline]
inode_permission+0xc1/0x630 fs/namei.c:593
may_lookup fs/namei.c:1836 [inline]
link_path_walk+0x197/0xe20 fs/namei.c:2445
path_parentat+0x2b/0x110 fs/namei.c:2701
__filename_parentat+0x22f/0x680 fs/namei.c:2725
filename_parentat fs/namei.c:2743 [inline]
filename_create+0xbf/0x4a0 fs/namei.c:4120
do_mkdirat+0xaa/0x3e0 fs/namei.c:4391
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4414
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8eaed8ebe9
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:00007f8eafba3038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f8eaefb5fa0 RCX: 00007f8eaed8ebe9
RDX: 0000000000000000 RSI: 0000200000000240 RDI: ffffffffffffff9c
RBP: 00007f8eaee11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8eaefb6038 R14: 00007f8eaefb5fa0 R15: 00007ffd75fa9938
Allocated by task 18870:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:388 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4365 [inline]
__kmalloc_node_track_caller_noprof+0x221/0x510 mm/slub.c:4384
kmemdup_noprof+0x29/0x60 mm/util.c:138
kmemdup_noprof include/linux/fortify-string.h:765 [inline]
cache_create_net+0x2b/0x220 net/sunrpc/cache.c:1743
rsi_cache_create_net net/sunrpc/auth_gss/svcauth_gss.c:2024 [inline]
gss_svc_init_net+0x122/0x660 net/sunrpc/auth_gss/svcauth_gss.c:2084
ops_init+0x1e2/0x5f0 net/core/net_namespace.c:136
setup_net+0x10f/0x380 net/core/net_namespace.c:438
copy_net_ns+0x2a6/0x5f0 net/core/net_namespace.c:570
create_new_namespaces+0x3ea/0xa90 kernel/nsproxy.c:110
unshare_nsproxy_namespaces+0xc0/0x1f0 kernel/nsproxy.c:218
ksys_unshare+0x45b/0xa40 kernel/fork.c:3127
__do_sys_unshare kernel/fork.c:3198 [inline]
__se_sys_unshare kernel/fork.c:3196 [inline]
__x64_sys_unshare+0x31/0x40 kernel/fork.c:3196
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 14868:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2417 [inline]
slab_free mm/slub.c:4680 [inline]
kfree+0x2b4/0x4d0 mm/slub.c:4879
rsi_cache_destroy_net net/sunrpc/auth_gss/svcauth_gss.c:2044 [inline]
gss_svc_shutdown_net+0x1de/0x2f0 net/sunrpc/auth_gss/svcauth_gss.c:2111
ops_exit_list net/core/net_namespace.c:198 [inline]
ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:251
cleanup_net+0x408/0x890 net/core/net_namespace.c:682
process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c5/0x780 kernel/kthread.c:463
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88805bfe0800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88805bfe0800, ffff88805bfe0a00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805bfe1800 pfn:0x5bfe0
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 ffff88801b841c80 ffffea0001f2b110 ffffea0000935310
raw: ffff88805bfe1800 000000000010000c 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801b841c80 ffffea0001f2b110 ffffea0000935310
head: ffff88805bfe1800 000000000010000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00016ff801 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 5842, tgid 5842 (syz-executor), ts 72102555961, free_ts 16869568045
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2487 [inline]
allocate_slab mm/slub.c:2655 [inline]
new_slab+0x247/0x330 mm/slub.c:2709
___slab_alloc+0xcf2/0x1740 mm/slub.c:3891
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3981
__slab_alloc_node mm/slub.c:4056 [inline]
slab_alloc_node mm/slub.c:4217 [inline]
__do_kmalloc_node mm/slub.c:4364 [inline]
__kmalloc_noprof+0x2f2/0x510 mm/slub.c:4377
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x14c/0x870 net/ipv6/route.c:3811
addrconf_f6i_alloc+0x2da/0x660 net/ipv6/route.c:4680
ipv6_add_addr+0x531/0x1fe0 net/ipv6/addrconf.c:1126
inet6_addr_add+0x256/0x960 net/ipv6/addrconf.c:3050
inet6_rtm_newaddr+0x1619/0x1c70 net/ipv6/addrconf.c:5059
rtnetlink_rcv_msg+0x95b/0xe90 net/core/rtnetlink.c:6946
netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
__free_frozen_pages+0x7d5/0x10f0 mm/page_alloc.c:2895
__free_pages mm/page_alloc.c:5260 [inline]
free_contig_range+0x183/0x4b0 mm/page_alloc.c:7091
destroy_args+0x794/0xc10 mm/debug_vm_pgtable.c:958
debug_vm_pgtable+0x1a32/0x3640 mm/debug_vm_pgtable.c:1345
do_one_initcall+0x120/0x6e0 init/main.c:1269
do_initcall_level init/main.c:1331 [inline]
do_initcalls init/main.c:1347 [inline]
do_basic_setup init/main.c:1366 [inline]
kernel_init_freeable+0x5c2/0x910 init/main.c:1579
kernel_init+0x1c/0x2b0 init/main.c:1469
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88805bfe0700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805bfe0780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805bfe0800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805bfe0880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805bfe0900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f5 cmc
1: 53 push %rbx
2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
7: 48 89 fb mov %rdi,%rbx
a: 48 83 c7 18 add $0x18,%rdi
e: e8 46 5c 01 f6 call 0xf6015c59
13: 48 89 df mov %rbx,%rdi
16: e8 2e b0 01 f6 call 0xf601b049
1b: f7 c5 00 02 00 00 test $0x200,%ebp
21: 75 23 jne 0x46
23: 9c pushf
24: 58 pop %rax
25: f6 c4 02 test $0x2,%ah
28: 75 37 jne 0x61
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 05 af f1 f5 call 0xf5f1af39
34: 65 8b 05 0e 0c 40 08 mov %gs:0x8400c0e(%rip),%eax # 0x8400c49
3b: 85 c0 test %eax,%eax
3d: 74 16 je 0x55
3f: 5b pop %rbx