==================================================================
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 ffffc9000549fb88 by task syz-executor.1/7068
CPU: 0 PID: 7068 Comm: syz-executor.1 Not tainted 6.2.0-rc8-next-20230220-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
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
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
</IRQ>
<TASK>
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 7c 77 b6 f8 49 8d bc
RSP: 0018:ffffc9000549f9a0 EFLAGS: 00000296
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90013829000
RDX: 0000000000040000 RSI: ffffffff88ce2bee RDI: ffffc9000549f7c0
RBP: ffff88801749e140 R08: 0000000000000001 R09: ffffc9000549f7c7
R10: fffff52000a93ef8 R11: 0000000000000000 R12: ffff8880790fb800
R13: 0000000000000000 R14: 0000000000000000 R15: ffffc9000549f940
asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0000:___sys_recvmsg+0x0/0x180 net/socket.c:2755
Code: 00 00 75 1d 48 81 c4 a0 00 00 00 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 41 bc f2 ff ff ff eb b0 e8 c4 55 09 02 0f 1f 40 00 <48> b8 00 00 00 00 00 fc ff df 41 57 45 89 c7 41 56 49 89 f6 41 55
RSP: 0000:1ffff11005095c3d EFLAGS: 00000000 ORIG_RAX: ffffffff8bfc3808
RAX: 00000000201c4e00 RBX: c169d5eed83a8500 RCX: 0000000000007135
RDX: ffffffff880cbb32 RSI: ffff88803ab8ce00 RDI: 0000000041b58ab3
RBP: 0000000000000000 R08: ffffc9000549fdb0 R09: 0000000000000002
R10: 0000000000000000 R11: 1ffff92000a93f6e R12: ffffffff8a1611ad
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</TASK>
The buggy address belongs to stack of task syz-executor.1/7068
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
[ffffc90005498000, ffffc900054a1000) created by:
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
The buggy address belongs to the physical page:
page:ffffea0000cf6b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x33dac
memcg:ffff88807aeeac02
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff ffff88807aeeac02
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 7057, tgid 7057 (syz-executor.5), ts 525184307127, free_ts 522672830738
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_list+0x176/0xcd0 mm/page_alloc.c:3542
release_pages+0xcd7/0x1380 mm/swap.c:1042
tlb_batch_pages_flush+0xa8/0x1a0 mm/mmu_gather.c:97
tlb_flush_mmu_free mm/mmu_gather.c:292 [inline]
tlb_flush_mmu mm/mmu_gather.c:299 [inline]
tlb_finish_mmu+0x14b/0x7e0 mm/mmu_gather.c:391
exit_mmap+0x205/0x7d0 mm/mmap.c:3047
__mmput+0x128/0x4c0 kernel/fork.c:1209
mmput+0x60/0x70 kernel/fork.c:1231
copy_process+0x321e/0x76c0 kernel/fork.c:2536
kernel_clone+0xeb/0xa10 kernel/fork.c:2684
__do_sys_clone3+0x1cd/0x2e0 kernel/fork.c:2983
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:
ffffc9000549fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f3 f3
ffffc9000549fb00: f3 f3 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1
>ffffc9000549fb80: f1 f1 00 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 00
^
ffffc9000549fc00: 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00
ffffc9000549fc80: 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 7c 77 b6 f8 callq 0xf8b677b9
3d: 49 rex.WB
3e: 8d .byte 0x8d
3f: bc .byte 0xbc