==================================================================
BUG: KASAN: use-after-free in smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:782
Read of size 8 at addr ffff88801eff9568 by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.18.0-rc4-syzkaller-00050-g46cf2c613f4b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
smc_fback_error_report+0x96/0xa0 net/smc/af_smc.c:782
sk_error_report+0x35/0x310 net/core/sock.c:340
tcp_write_err net/ipv4/tcp_timer.c:71 [inline]
tcp_probe_timer net/ipv4/tcp_timer.c:395 [inline]
tcp_write_timer_handler+0x437/0xbc0 net/ipv4/tcp_timer.c:626
tcp_write_timer+0xa2/0x2b0 net/ipv4/tcp_timer.c:642
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421
expire_timers kernel/time/timer.c:1466 [inline]
__run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1737
__run_timers kernel/time/timer.c:1715 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1750
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:637
irq_exit_rcu+0x5/0x20 kernel/softirq.c:649
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:29 [inline]
RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:70 [inline]
RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:130 [inline]
RIP: 0010:acpi_safe_halt drivers/acpi/processor_idle.c:116 [inline]
RIP: 0010:acpi_idle_do_entry+0x1c6/0x250 drivers/acpi/processor_idle.c:556
Code: 89 de e8 0d e2 0b f8 84 db 75 ac e8 24 de 0b f8 e8 df 26 12 f8 eb 0c e8 18 de 0b f8 0f 00 2d 81 ba c5 00 e8 0c de 0b f8 fb f4 <9c> 5b 81 e3 00 02 00 00 fa 31 ff 48 89 de e8 87 e0 0b f8 48 85 db
RSP: 0018:ffffc9000038fd18 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff888011534200 RSI: ffffffff896c86e4 RDI: 0000000000000000
RBP: ffff888016b3b064 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff817eade8 R11: 0000000000000000 R12: 0000000000000001
R13: ffff888016b3b000 R14: ffff888016b3b064 R15: ffff888147eef804
acpi_idle_enter+0x361/0x500 drivers/acpi/processor_idle.c:691
cpuidle_enter_state+0x1b1/0xc80 drivers/cpuidle/cpuidle.c:237
cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:351
call_cpuidle kernel/sched/idle.c:155 [inline]
cpuidle_idle_call kernel/sched/idle.c:236 [inline]
do_idle+0x3e8/0x590 kernel/sched/idle.c:303
cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
start_secondary+0x265/0x340 arch/x86/kernel/smpboot.c:266
secondary_startup_64_no_verify+0xc3/0xcb
Allocated by task 2963:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
__kasan_slab_alloc+0x85/0xb0 mm/kasan/common.c:469
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc mm/slab.c:3316 [inline]
__kmem_cache_alloc_lru mm/slab.c:3493 [inline]
kmem_cache_alloc+0x265/0x560 mm/slab.c:3513
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
user_path_at_empty+0x2b/0x60 fs/namei.c:2850
do_readlinkat+0xcd/0x2f0 fs/stat.c:456
__do_sys_readlink fs/stat.c:489 [inline]
__se_sys_readlink fs/stat.c:486 [inline]
__x64_sys_readlink+0x74/0xb0 fs/stat.c:486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 2963:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x13d/0x180 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
__cache_free mm/slab.c:3439 [inline]
kmem_cache_free.part.0+0xa9/0x240 mm/slab.c:3749
putname fs/namei.c:270 [inline]
putname+0xfe/0x140 fs/namei.c:256
user_path_at_empty+0x4d/0x60 fs/namei.c:2853
do_readlinkat+0xcd/0x2f0 fs/stat.c:456
__do_sys_readlink fs/stat.c:489 [inline]
__se_sys_readlink fs/stat.c:486 [inline]
__x64_sys_readlink+0x74/0xb0 fs/stat.c:486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
The buggy address belongs to the object at ffff88801eff8640
which belongs to the cache names_cache of size 4096
The buggy address is located 3880 bytes inside of
4096-byte region [ffff88801eff8640, ffff88801eff9640)
The buggy address belongs to the physical page:
page:ffffea00007bfe00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1eff8
head:ffffea00007bfe00 order:1 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001cede08 ffffea0001db0a08 ffff8881400a3000
raw: 0000000000000000 ffff88801eff8640 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 2963, tgid 2963 (udevd), ts 3221468139813, free_ts 3221355749411
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3e00 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
__alloc_pages_node include/linux/gfp.h:587 [inline]
kmem_getpages mm/slab.c:1378 [inline]
cache_grow_begin+0x75/0x350 mm/slab.c:2584
cache_alloc_refill+0x27f/0x380 mm/slab.c:2957
____cache_alloc mm/slab.c:3040 [inline]
____cache_alloc mm/slab.c:3023 [inline]
__do_cache_alloc mm/slab.c:3267 [inline]
slab_alloc mm/slab.c:3309 [inline]
__kmem_cache_alloc_lru mm/slab.c:3493 [inline]
kmem_cache_alloc+0x450/0x560 mm/slab.c:3513
getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
getname_flags+0x9a/0xe0 include/linux/audit.h:323
user_path_at_empty+0x2b/0x60 fs/namei.c:2850
do_readlinkat+0xcd/0x2f0 fs/stat.c:456
__do_sys_readlink fs/stat.c:489 [inline]
__se_sys_readlink fs/stat.c:486 [inline]
__x64_sys_readlink+0x74/0xb0 fs/stat.c:486
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x6a0 mm/page_alloc.c:3423
slab_destroy mm/slab.c:1630 [inline]
slabs_destroy+0x89/0xc0 mm/slab.c:1650
cache_flusharray mm/slab.c:3411 [inline]
___cache_free+0x34e/0x670 mm/slab.c:3474
qlink_free mm/kasan/quarantine.c:157 [inline]
qlist_free_all+0x4f/0x1b0 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x97/0xb0 mm/kasan/common.c:446
kasan_slab_alloc include/linux/kasan.h:224 [inline]
slab_post_alloc_hook mm/slab.h:749 [inline]
slab_alloc mm/slab.c:3316 [inline]
__do_kmalloc mm/slab.c:3708 [inline]
__kmalloc_track_caller+0x277/0x4d0 mm/slab.c:3725
kstrdup+0x36/0x70 mm/util.c:60
kstrdup_const+0x53/0x80 mm/util.c:83
__kernfs_new_node+0x9d/0x8b0 fs/kernfs/dir.c:581
kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:647
__kernfs_create_file+0x51/0x350 fs/kernfs/file.c:982
sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:188
Memory state around the buggy address:
ffff88801eff9400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801eff9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801eff9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801eff9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801eff9600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 0d e2 0b f8 callq 0xf80be214
7: 84 db test %bl,%bl
9: 75 ac jne 0xffffffb7
b: e8 24 de 0b f8 callq 0xf80bde34
10: e8 df 26 12 f8 callq 0xf81226f4
15: eb 0c jmp 0x23
17: e8 18 de 0b f8 callq 0xf80bde34
1c: 0f 00 2d 81 ba c5 00 verw 0xc5ba81(%rip) # 0xc5baa4
23: e8 0c de 0b f8 callq 0xf80bde34
28: fb sti
29: f4 hlt
* 2a: 9c pushfq <-- trapping instruction
2b: 5b pop %rbx
2c: 81 e3 00 02 00 00 and $0x200,%ebx
32: fa cli
33: 31 ff xor %edi,%edi
35: 48 89 de mov %rbx,%rsi
38: e8 87 e0 0b f8 callq 0xf80be0c4
3d: 48 85 db test %rbx,%rbx