==================================================================
BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:136 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x17fc/0x1ef0 arch/x86/kernel/unwind_orc.c:455
Read of size 8 at addr ffffc9000c0f7b88 by task syz-executor.0/9576
CPU: 0 PID: 9576 Comm: syz-executor.0 Not tainted 6.2.0-next-20230221-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
__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
user_mode arch/x86/include/asm/ptrace.h:136 [inline]
unwind_next_frame+0x17fc/0x1ef0 arch/x86/kernel/unwind_orc.c:455
arch_stack_walk+0x81/0xf0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x90/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:491
irq_work_queue_on+0xd6/0x1a0 kernel/irq_work.c:140
irq_work_single+0x1e4/0x260 kernel/irq_work.c:211
__flush_smp_call_function_queue+0x4a3/0xad0 kernel/smp.c:668
__sysvec_call_function_single+0xce/0x4f0 arch/x86/kernel/smp.c:248
sysvec_call_function_single+0x92/0xc0 arch/x86/kernel/smp.c:243
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:__unix_dgram_recvmsg+0x481/0xb90 net/unix/af_unix.c:2530
Code: 08 00 00 00 00 c7 40 14 00 00 00 00 48 8b 84 24 20 01 00 00 65 48 2b 04 25 28 00 00 00 0f 85 19 06 00 00 48 81 c4 28 01 00 00 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 e8 ec b3 b6 f8 49 8d bc
RSP: 0018:ffffc9000c0f79a0 EFLAGS: 00000296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900062c9000
RDX: 0000000000040000 RSI: ffffffff88cdefbe RDI: ffffc9000c0f77c0
RBP: ffff88801f44a500 R08: 0000000000000001 R09: ffffc9000c0f77c7
R10: fffff5200181eef8 R11: 0000000000000000 R12: ffff88807d10f000
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000c0f7940
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0046:___sys_recvmsg+0x0/0x180 net/socket.c:2755
RSP: 8164e57d:0000000000000001 EFLAGS: 00000000 ORIG_RAX: ffffffff8bfc5030
RAX: 00000000200f6c00 RBX: 5a6d8d69cb434c00 RCX: 0000000000003dad
RDX: ffffffff880c7ba2 RSI: ffff888039211e00 RDI: 0000000041b58ab3
RBP: 0000000000000000 R08: ffffc9000c0f7db0 R09: 0000000000000002
R10: 0000000000000000 R11: 1ffff9200181ef6e R12: ffffffff8a16912d
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
The buggy address belongs to stack of task syz-executor.0/9576
and is located at offset 24 in frame:
___sys_recvmsg+0x0/0x180 net/socket.c:2446
This frame has 3 objects:
[32, 40) 'iov'
[64, 72) 'uaddr'
[96, 224) 'iovstack'
The buggy address belongs to the virtual mapping at
[ffffc9000c0f0000, ffffc9000c0f9000) created by:
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
The buggy address belongs to the physical page:
page:ffffea0001f8d100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e344
memcg:ffff8880209af102
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff8880209af102
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 5121, tgid 5121 (syz-executor.4), ts 779304067298, free_ts 777787034708
prep_new_page mm/page_alloc.c:2552 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4339
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5605
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283
vm_area_alloc_pages mm/vmalloc.c:2942 [inline]
__vmalloc_area_node mm/vmalloc.c:3010 [inline]
__vmalloc_node_range+0xb8a/0x1300 mm/vmalloc.c:3180
alloc_thread_stack_node kernel/fork.c:311 [inline]
dup_task_struct kernel/fork.c:984 [inline]
copy_process+0x1320/0x76c0 kernel/fork.c:2100
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
__do_sys_clone+0xba/0x100 kernel/fork.c:2825
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:1453 [inline]
free_pcp_prepare+0x4de/0x930 mm/page_alloc.c:1503
free_unref_page_prepare mm/page_alloc.c:3401 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3496
vfree+0x180/0x7e0 mm/vmalloc.c:2741
kvfree+0x32/0x50 mm/util.c:647
kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:1318 [inline]
kvm_put_kvm+0x878/0xae0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1344
kvm_vcpu_release+0x51/0x70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3843
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:203
__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Memory state around the buggy address:
ffffc9000c0f7a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3
ffffc9000c0f7b00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
>ffffc9000c0f7b80: f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00
^
ffffc9000c0f7c00: 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00
ffffc9000c0f7c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 08 00 or %al,(%rax)
2: 00 00 add %al,(%rax)
4: 00 c7 add %al,%bh
6: 40 14 00 adc $0x0,%al
9: 00 00 add %al,(%rax)
b: 00 48 8b add %cl,-0x75(%rax)
e: 84 24 20 test %ah,(%rax,%riz,1)
11: 01 00 add %eax,(%rax)
13: 00 65 48 add %ah,0x48(%rbp)
16: 2b 04 25 28 00 00 00 sub 0x28,%eax
1d: 0f 85 19 06 00 00 jne 0x63c
23: 48 81 c4 28 01 00 00 add $0x128,%rsp
* 2a: 44 89 e8 mov %r13d,%eax <-- trapping instruction
2d: 5b pop %rbx
2e: 5d pop %rbp
2f: 41 5c pop %r12
31: 41 5d pop %r13
33: 41 5e pop %r14
35: 41 5f pop %r15
37: c3 retq
38: e8 ec b3 b6 f8 callq 0xf8b6b429
3d: 49 rex.WB
3e: 8d .byte 0x8d
3f: bc .byte 0xbc