syzbot

kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffff8881e634b3f0
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0011) - permissions violation
PGD 7801067 P4D 7801067 PUD 1e20b8063 PMD 1d7816063 PTE 80000001e634b163
Oops: 0011 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3335 Comm: syz.8.861 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:0xffff8881e634b3f0
Code: 00 00 00 b0 34 e6 81 88 ff ff 91 b3 34 e6 81 88 ff ff b0 b3 34 e6 81 88 ff ff f0 b1 34 e6 81 88 ff ff 00 b0 34 e6 81 88 ff ff <d0> b1 34 e6 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881eacd4ec0
RDX: 0000000000000101 RSI: ffff8881e634b3f0 RDI: ffff8881e634b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb440
R13: dffffc0000000000 R14: ffff8881e634b3f0 R15: ffff8881e634b1c0
FS:  00007f114b6636c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881e634b3f0 CR3: 00000001e027c000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830
 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x195/0x1c0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:539 [inline]
 smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834
 </IRQ>
RIP: 0010:__alloc_pages include/linux/gfp.h:503 [inline]
RIP: 0010:__alloc_pages_node include/linux/gfp.h:516 [inline]
RIP: 0010:alloc_pages_node include/linux/gfp.h:530 [inline]
RIP: 0010:__get_free_pages+0x3/0x30 mm/page_alloc.c:4937
Code: 80 c1 03 38 c1 0f 8c 2d da ff ff 48 8d bc 24 20 02 00 00 e8 ef d0 03 00 e9 1b da ff ff e8 65 89 aa ff 0f 1f 44 00 00 83 e7 fd <31> c9 e8 06 a3 ff ff 48 89 c1 48 c1 e1 06 48 ba 00 00 00 00 80 08
RSP: 0018:ffff8881de767650 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13
RAX: ffff8881eacd4ec0 RBX: ffff8881de767a24 RCX: 0000000000000002
RDX: ffffc9000895a000 RSI: 0000000000000000 RDI: 0000000000002800
RBP: 0000000000000002 R08: ffffffff818d6521 R09: fffff94000f171f7
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8881de767a28
R13: 1ffff1103bcecf44 R14: 1ffff1103bcecf45 R15: 0000000000000000
 tlb_next_batch mm/mmu_gather.c:29 [inline]
 __tlb_remove_page_size+0x16b/0x2f0 mm/mmu_gather.c:83
 __tlb_remove_page include/asm-generic/tlb.h:426 [inline]
 zap_pte_range mm/memory.c:1108 [inline]
 zap_pmd_range mm/memory.c:1222 [inline]
 zap_pud_range mm/memory.c:1251 [inline]
 zap_p4d_range mm/memory.c:1272 [inline]
 unmap_page_range+0x11b3/0x2620 mm/memory.c:1293
 unmap_single_vma mm/memory.c:1338 [inline]
 unmap_vmas+0x355/0x4b0 mm/memory.c:1370
 exit_mmap+0x2bc/0x520 mm/mmap.c:3191
 __mmput+0x8e/0x2c0 kernel/fork.c:1101
 copy_process+0x1f42/0x3230 kernel/fork.c:2298
 _do_fork+0x197/0x900 kernel/fork.c:2399
 __do_sys_clone kernel/fork.c:2557 [inline]
 __se_sys_clone kernel/fork.c:2538 [inline]
 __x64_sys_clone+0x26b/0x2c0 kernel/fork.c:2538
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f114cffa169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f114b662fe8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f114d221fa0 RCX: 00007f114cffa169
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040b04000
RBP: 00007f114d07ca68 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f114d221fa0 R15: 00007ffff206f178
Modules linked in:
CR2: ffff8881e634b3f0
---[ end trace f3fb167207c6858d ]---
RIP: 0010:0xffff8881e634b3f0
Code: 00 00 00 b0 34 e6 81 88 ff ff 91 b3 34 e6 81 88 ff ff b0 b3 34 e6 81 88 ff ff f0 b1 34 e6 81 88 ff ff 00 b0 34 e6 81 88 ff ff <d0> b1 34 e6 81 88 ff ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffff8881f6f09d18 EFLAGS: 00010202
RAX: ffffffff8154e8ca RBX: 0000000000000101 RCX: ffff8881eacd4ec0
RDX: 0000000000000101 RSI: ffff8881e634b3f0 RDI: ffff8881e634b1c0
RBP: ffff8881f6f09ec8 R08: ffffffff8154e50e R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 00000000ffffb440
R13: dffffc0000000000 R14: ffff8881e634b3f0 R15: ffff8881e634b1c0
FS:  00007f114b6636c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff8881e634b3f0 CR3: 00000001e027c000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
----------------
Code disassembly (best guess):
   0:	80 c1 03             	add    $0x3,%cl
   3:	38 c1                	cmp    %al,%cl
   5:	0f 8c 2d da ff ff    	jl     0xffffda38
   b:	48 8d bc 24 20 02 00 	lea    0x220(%rsp),%rdi
  12:	00
  13:	e8 ef d0 03 00       	call   0x3d107
  18:	e9 1b da ff ff       	jmp    0xffffda38
  1d:	e8 65 89 aa ff       	call   0xffaa8987
  22:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  27:	83 e7 fd             	and    $0xfffffffd,%edi
* 2a:	31 c9                	xor    %ecx,%ecx <-- trapping instruction
  2c:	e8 06 a3 ff ff       	call   0xffffa337
  31:	48 89 c1             	mov    %rax,%rcx
  34:	48 c1 e1 06          	shl    $0x6,%rcx
  38:	48                   	rex.W
  39:	ba 00 00 00 00       	mov    $0x0,%edx
  3e:	80                   	.byte 0x80
  3f:	08                   	.byte 0x8