[syzbot] [i2c?] KASAN: stack-out-of-bounds Write in i801_isr (2)

syzbot
2023-04-11T06:32:59Z

Hello,

syzbot found the following issue on:

HEAD commit: 99ddf2254feb Merge tag 'trace-v6.3-rc5' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=129f2409c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=adfc55aec6afccdd
dashboard link: https://syzkaller.appspot.com/bug?extid=33b0400029edbd2b4377
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+33b0400029edbd2b4377@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: stack-out-of-bounds in i801_isr_byte_done drivers/i2c/busses/i2c-i801.c:546 [inline]
BUG: KASAN: stack-out-of-bounds in i801_isr drivers/i2c/busses/i2c-i801.c:613 [inline]
BUG: KASAN: stack-out-of-bounds in i801_isr+0xcd8/0xe20 drivers/i2c/busses/i2c-i801.c:594
Write of size 1 at addr ffffc900028e7db0 by tasmbus: error: Unexpected send start condition in state 2

CPU: 0 PID: 53 Comm: kworker/u8:3 Not tainted 6.3.0-rc5-syzkaller-00032-g99ddf2254feb #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: bat_events batadv_nc_worker
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319
print_report mm/kasan/report.c:430 [inline]
kasan_report+0x11c/0x130 mm/kasan/report.c:536
i801_isr_byte_done drivers/i2c/busses/i2c-i801.c:546 [inline]
i801_isr drivers/i2c/busses/i2c-i801.c:613 [inline]
i801_isr+0xcd8/0xe20 drivers/i2c/busses/i2c-i801.c:594
__handle_irq_event_percpu+0x22b/0x730 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_fasteoi_irq+0x233/0x9f0 kernel/irq/chip.c:714
generic_handle_irq_desc include/linux/irqdesc.h:158 [inline]
handle_irq arch/x86/kernel/irq.c:231 [inline]
__common_interrupt+0xa1/0x220 arch/x86/kernel/irq.c:250
common_interrupt+0x51/0xd0 arch/x86/kernel/irq.c:240
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:__do_softirq+0x19a/0x905 kernel/softirq.c:557
Code: 00 48 01 f0 48 89 44 24 18 48 c7 c7 40 01 4b 8a e8 1b 80 fc ff 65 66 c7 05 41 a2 01 76 00 00 e8 ec 69 86 f7 fb bb ff ff ff ff <48> c7 c5 c0 a0 40 8c 41 0f bc de 83 c3 01 0f 85 aa 00 00 00 e9 85
RSP: 0000:ffffc90000007f70 EFLAGS: 00000206
RAX: 00000000018f5cd8 RBX: 00000000ffffffff RCX: 1ffffffff22a3f4e
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff888013eb40c0 R08: 0000000000000001 R09: ffffffff914c7c6f
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000200 R15: 0000000000000000
invoke_softirq kernel/softirq.c:445 [inline]
__irq_exit_rcu+0x114/0x190 kernel/softirq.c:650
irq_exit_rcu+0x9/0x20 kernel/softirq.c:662
sysvec_apic_timer_interrupt+0x97/0xc0 arch/x86/kernel/apic/apic.c:1107
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:lock_acquire+0x1f3/0x520 kernel/locking/lockdep.c:5637
Code: bb 9e 7e 83 f8 01 0f 85 b9 02 00 00 9c 58 f6 c4 02 0f 85 a4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0000:ffffc900007e7b28 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920000fcf67 RCX: bbc06d1d311ad187
RDX: 1ffff11002aa1d4e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff914c7b87
R10: fffffbfff2298f70 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff8c7925c0 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:327 [inline]
rcu_read_lock include/linux/rcupdate.h:773 [inline]
batadv_nc_process_nc_paths.part.0+0xec/0x3f0 net/batman-adv/network-coding.c:687
batadv_nc_process_nc_paths net/batman-adv/network-coding.c:679 [inline]
batadv_nc_worker+0xc82/0xfe0 net/batman-adv/network-coding.c:728
process_one_work+0x991/0x15c0 kernel/workqueue.c:2390
worker_thread+0x669/0x1090 kernel/workqueue.c:2537
kthread+0x2e8/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308
</TASK>

The buggy address belongs to the virtual mapping at
[ffffc900028e0000, ffffc900028e9000) created by:
kernel_clone+0xeb/0x890 kernel/fork.c:2679

The buggy address belongs to the physical page:
page:ffffea0001bfe780 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6ff9e
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
raw: 04fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x102dc2(GFP_HIGHUSER|__GFP_NOWARN|__GFP_ZERO), pid 5172, tgid 5172 (syz-executor.2), ts 889522562513, free_ts 889116806536
prep_new_page mm/page_alloc.c:2553 [inline]
get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326
__alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283
vm_area_alloc_pages mm/vmalloc.c:2953 [inline]
__vmalloc_area_node mm/vmalloc.c:3029 [inline]
__vmalloc_node_range+0xafe/0x1390 mm/vmalloc.c:3199
alloc_thread_stack_node kernel/fork.c:311 [inline]
dup_task_struct kernel/fork.c:979 [inline]
copy_process+0x1320/0x7590 kernel/fork.c:2095
kernel_clone+0xeb/0x890 kernel/fork.c:2679
__do_sys_clone+0xba/0x100 kernel/fork.c:2820
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1454 [inline]
free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1504
free_unref_page_prepare mm/page_alloc.c:3388 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3483
slab_destroy mm/slab.c:1613 [inline]
slabs_destroy+0x85/0xc0 mm/slab.c:1633
__cache_free_alien mm/slab.c:773 [inline]
cache_free_alien mm/slab.c:789 [inline]
___cache_free+0x204/0x3d0 mm/slab.c:3417
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x4f/0x1a0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
slab_alloc_node mm/slab.c:3257 [inline]
slab_alloc mm/slab.c:3266 [inline]
__kmem_cache_alloc_lru mm/slab.c:3443 [inline]
kmem_cache_alloc+0x1bd/0x3f0 mm/slab.c:3452
getname_flags.part.0+0x50/0x4f0 fs/namei.c:140
getname_flags include/linux/audit.h:321 [inline]
getname+0x92/0xd0 fs/namei.c:219
do_sys_openat2+0xf5/0x4c0 fs/open.c:1342
do_sys_open fs/open.c:1364 [inline]
__do_sys_openat fs/open.c:1380 [inline]
__se_sys_openat fs/open.c:1375 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1375
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffffc900028e7c80: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffc900028e7d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffffc900028e7d80: f1 f1 f1 f1 04 f3 f3 f3 00 00 00 00 00 00 00 00
^
ffffc900028e7e00: 00 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00
ffffc900028e7e80: 00 00 f3 f3 f3 f3 f3 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 00 48 01 add %cl,0x1(%rax)
3: f0 48 89 44 24 18 lock mov %rax,0x18(%rsp)
9: 48 c7 c7 40 01 4b 8a mov $0xffffffff8a4b0140,%rdi
10: e8 1b 80 fc ff callq 0xfffc8030
15: 65 66 c7 05 41 a2 01 movw $0x0,%gs:0x7601a241(%rip) # 0x7601a260
1c: 76 00 00
1f: e8 ec 69 86 f7 callq 0xf7866a10
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 48 c7 c5 c0 a0 40 8c mov $0xffffffff8c40a0c0,%rbp <-- trapping instruction
31: 41 0f bc de bsf %r14d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 aa 00 00 00 jne 0xe8
3e: e9 .byte 0xe9
3f: 85 .byte 0x85

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