[syzbot] [kernel?] KASAN: stack-out-of-bounds Read in __show_regs (2)

From: syzbot
Date: Sat Jun 15 2024 - 03:06:33 EST

Next message: Naresh Kamboju: "Re: [PATCH 5.10 000/317] 5.10.219-rc1 review"
Previous message: William Breathitt Gray: "Re: [PATCH] counter: ti-eqep: implement over/underflow events"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Hello,

syzbot found the following issue on:

HEAD commit: a957267fa7e9 Add linux-next specific files for 20240611
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=171e6e56980000
kernel config: https://syzkaller.appspot.com/x/.config?x=9a880e96898e79f8
dashboard link: https://syzkaller.appspot.com/bug?extid=e9be5674af5e3a0b9ecc
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/6451759a606b/disk-a957267f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/7f635dbe5b8a/vmlinux-a957267f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/33eafd1b8aec/bzImage-a957267f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+e9be5674af5e3a0b9ecc@xxxxxxxxxxxxxxxxxxxxxxxxx

asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:synchronize_rcu+0x0/0x360 kernel/rcu/tree.c:4005
Code: Unable to access opcode bytes at 0x1ffff920012daeae.
RSP: 76c0:0000000000000203 EFLAGS: 1ffff920012daed4
==================================================================
BUG: KASAN: stack-out-of-bounds in __show_regs+0xa6/0x610 arch/x86/kernel/process_64.c:83
Read of size 8 at addr ffffc900096d7618 by task syz-executor.0/9934

CPU: 1 PID: 9934 Comm: syz-executor.0 Not tainted 6.10.0-rc3-next-20240611-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:91 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:117
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
__show_regs+0xa6/0x610 arch/x86/kernel/process_64.c:83
show_trace_log_lvl+0x3d4/0x520 arch/x86/kernel/dumpstack.c:301
sched_show_task+0x578/0x740 kernel/sched/core.c:7432
report_rtnl_holders+0x1ba/0x2d0 net/core/rtnetlink.c:104
call_timer_fn+0x18e/0x650 kernel/time/timer.c:1792
expire_timers kernel/time/timer.c:1843 [inline]
__run_timers kernel/time/timer.c:2417 [inline]
__run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2428
run_timer_base kernel/time/timer.c:2437 [inline]
run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2447
handle_softirqs+0x2c4/0x970 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x30 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
</IRQ>
<TASK>
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+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 4e d0 63 f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c3 eb cc f5 65 8b 05 74 4f 6e 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc9000330f600 EFLAGS: 00000206
RAX: 4e6b703e49168e00 RBX: 1ffff92000661ec4 RCX: ffffffff816fafba
RDX: dffffc0000000000 RSI: ffffffff8bcac1a0 RDI: 0000000000000001
RBP: ffffc9000330f690 R08: ffffffff92fcb7ef R09: 1ffffffff25f96fd
R10: dffffc0000000000 R11: fffffbfff25f96fe R12: dffffc0000000000
R13: 1ffff92000661ec0 R14: ffffc9000330f620 R15: 0000000000000246
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock+0x18c/0x1e0 kernel/sched/wait.c:108
__unix_dgram_recvmsg+0x5f4/0x12f0 net/unix/af_unix.c:2415
sock_recvmsg_nosec+0x18e/0x1d0 net/socket.c:1046
____sys_recvmsg+0x3c0/0x470 net/socket.c:2802
___sys_recvmsg net/socket.c:2846 [inline]
do_recvmmsg+0x474/0xae0 net/socket.c:2940
__sys_recvmmsg net/socket.c:3019 [inline]
__do_sys_recvmmsg net/socket.c:3042 [inline]
__se_sys_recvmmsg net/socket.c:3035 [inline]
__x64_sys_recvmmsg+0x199/0x250 net/socket.c:3035
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53cfc7cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f53d0a0c0c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007f53cfdb4050 RCX: 00007f53cfc7cea9
RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007f53cfcebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f53cfdb4050 R15: 00007fffb8c061e8
</TASK>

The buggy address belongs to the virtual mapping at
[ffffc900096d0000, ffffc900096d9000) created by:
copy_process+0x5d1/0x3dc0 kernel/fork.c:2201

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88807c7f0000 pfn:0x7c7f0
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: ffff88807c7f0000 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 2, tgid 2 (kthreadd), ts 126928355749, free_ts 121449634751
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1470
prep_new_page mm/page_alloc.c:1478 [inline]
get_page_from_freelist+0x2cbd/0x2d70 mm/page_alloc.c:3457
__alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4715
alloc_pages_mpol_noprof+0x3e8/0x680 mm/mempolicy.c:2263
vm_area_alloc_pages mm/vmalloc.c:3567 [inline]
__vmalloc_area_node mm/vmalloc.c:3643 [inline]
__vmalloc_node_range_noprof+0x971/0x1460 mm/vmalloc.c:3824
alloc_thread_stack_node kernel/fork.c:310 [inline]
dup_task_struct+0x444/0x8c0 kernel/fork.c:1110
copy_process+0x5d1/0x3dc0 kernel/fork.c:2201
kernel_clone+0x226/0x8f0 kernel/fork.c:2778
kernel_thread+0x1bc/0x240 kernel/fork.c:2840
create_kthread kernel/kthread.c:412 [inline]
kthreadd+0x60d/0x810 kernel/kthread.c:765
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:144
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
page last free pid 5674 tgid 5674 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1089 [inline]
free_unref_folios+0x103a/0x1b00 mm/page_alloc.c:2669
folios_put_refs+0x76e/0x860 mm/swap.c:1020
free_pages_and_swap_cache+0x2ea/0x690 mm/swap_state.c:332
__tlb_batch_free_encoded_pages mm/mmu_gather.c:136 [inline]
tlb_batch_pages_flush mm/mmu_gather.c:149 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:366 [inline]
tlb_flush_mmu+0x3a3/0x680 mm/mmu_gather.c:373
tlb_finish_mmu+0xd4/0x200 mm/mmu_gather.c:465
exit_mmap+0x44f/0xc80 mm/mmap.c:3395
__mmput+0x115/0x390 kernel/fork.c:1341
exit_mm+0x220/0x310 kernel/exit.c:565
do_exit+0x9aa/0x28e0 kernel/exit.c:861
do_group_exit+0x207/0x2c0 kernel/exit.c:1023
__do_sys_exit_group kernel/exit.c:1034 [inline]
__se_sys_exit_group kernel/exit.c:1032 [inline]
__x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1032
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
ffffc900096d7500: 00 00 00 00 00 f3 f3 f3 f3 f3 f3 f3 00 00 00 00
ffffc900096d7580: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2
>ffffc900096d7600: 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 00 00
^
ffffc900096d7680: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 00 f3 f3 f3
ffffc900096d7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 9c pushf
1: 8f 44 24 20 pop 0x20(%rsp)
5: 42 80 3c 23 00 cmpb $0x0,(%rbx,%r12,1)
a: 74 08 je 0x14
c: 4c 89 f7 mov %r14,%rdi
f: e8 4e d0 63 f6 call 0xf663d062
14: f6 44 24 21 02 testb $0x2,0x21(%rsp)
19: 75 52 jne 0x6d
1b: 41 f7 c7 00 02 00 00 test $0x200,%r15d
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 c3 eb cc f5 call 0xf5ccebf2 <-- trapping instruction
2f: 65 8b 05 74 4f 6e 74 mov %gs:0x746e4f74(%rip),%eax # 0x746e4faa
36: 85 c0 test %eax,%eax
38: 74 43 je 0x7d
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss

---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

Next message: Naresh Kamboju: "Re: [PATCH 5.10 000/317] 5.10.219-rc1 review"
Previous message: William Breathitt Gray: "Re: [PATCH] counter: ti-eqep: implement over/underflow events"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]