linux-kernel - BUG: unable to handle kernel NULL pointer dereference in rcu

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Message-ID: <IA1PR07MB983057EE02C56A3FF3E0ED1BABAF9@IA1PR07MB9830.namprd07.prod.outlook.com>
Date:   Mon, 27 Feb 2023 06:23:21 +0000
From:   Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
To:     "paulmck@...nel.org" <paulmck@...nel.org>,
        "frederic@...nel.org" <frederic@...nel.org>,
        "quic_neeraju@...cinc.com" <quic_neeraju@...cinc.com>,
        "josh@...htriplett.org" <josh@...htriplett.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
        "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "joel@...lfernandes.org" <joel@...lfernandes.org>,
        "rcu@...r.kernel.org" <rcu@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>,
        "contact@...zz.com" <contact@...zz.com>
Subject: BUG: unable to handle kernel NULL pointer dereference in rcu_core

Good day, dear maintainers,

We found a bug using a modified kernel configuration file used by syzbot.

We enhanced the coverage of the configuration file using our tool, klocalizer.

Kernel Branch: 6.2.0-next-20230221
Kernel config: https://drive.google.com/file/d/1QKAQV11zjOwISifUc-skRBoTo3EXhutY/view?usp=share_link
C Reproducer: Unfortunately, there is no reproducer yet.

Thank you!

Best regards,
Sanan Hasanov

BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD 53756067 P4D 53756067 PUD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 7 PID: 0 Comm: swapper/7 Not tainted 6.2.0-next-20230221 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900003f8e48 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888100833900 RCX: 00000000b9582f6c
RDX: 1ffff11020106853 RSI: ffffffff816b2769 RDI: ffff888043f64708
RBP: 000000000000000c R08: 0000000000000000 R09: ffffffff900b895f
R10: fffffbfff201712b R11: 000000000008e001 R12: dffffc0000000000
R13: ffffc900003f8ec8 R14: ffff888043f64708 R15: 000000000000000b
FS:  0000000000000000(0000) GS:ffff888119f80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000054e64000 CR4: 0000000000350ee0
Call Trace:
 <IRQ>
 rcu_core+0x85d/0x1960
 __do_softirq+0x2e5/0xae2
 __irq_exit_rcu+0x11d/0x190
 irq_exit_rcu+0x9/0x20
 sysvec_apic_timer_interrupt+0x97/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:default_idle+0xf/0x20
Code: 89 07 49 c7 c0 08 00 00 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 76 ff ff ff cc cc cc cc f3 0f 1e fa eb 07 0f 00 2d e3 8a 34 00 fb f4 <fa> c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3 0f 1e fa 65
RSP: 0018:ffffc9000017fe00 EFLAGS: 00000202
RAX: 0000000000dfbea1 RBX: dffffc0000000000 RCX: ffffffff89b1da9c
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000007 R08: 0000000000000001 R09: ffff888119fb6c23
R10: ffffed10233f6d84 R11: dffffc0000000000 R12: 0000000000000003
R13: ffff888100833900 R14: ffffffff8e112850 R15: 0000000000000000
 default_idle_call+0x67/0xa0
 do_idle+0x361/0x440
 cpu_startup_entry+0x18/0x20
 start_secondary+0x256/0x300
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
Modules linked in:
CR2: 0000000000000000
---[ end trace 0000000000000000 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 0018:ffffc900003f8e48 EFLAGS: 00010246

RAX: 0000000000000000 RBX: ffff888100833900 RCX: 00000000b9582f6c
RDX: 1ffff11020106853 RSI: ffffffff816b2769 RDI: ffff888043f64708
RBP: 000000000000000c R08: 0000000000000000 R09: ffffffff900b895f
R10: fffffbfff201712b R11: 000000000008e001 R12: dffffc0000000000
R13: ffffc900003f8ec8 R14: ffff888043f64708 R15: 000000000000000b
FS:  0000000000000000(0000) GS:ffff888119f80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000054e64000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess):
   0:	89 07                	mov    %eax,(%rdi)
   2:	49 c7 c0 08 00 00 00 	mov    $0x8,%r8
   9:	4d 29 c8             	sub    %r9,%r8
   c:	4c 01 c7             	add    %r8,%rdi
   f:	4c 29 c2             	sub    %r8,%rdx
  12:	e9 76 ff ff ff       	jmp    0xffffff8d
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	cc                   	int3
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d e3 8a 34 00 	verw   0x348ae3(%rip)        # 0x348b0b
  28:	fb                   	sti
  29:	f4                   	hlt
* 2a:	fa                   	cli <-- trapping instruction
  2b:	c3                   	ret
  2c:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  33:	00 00 00 00
  37:	0f 1f 40 00          	nopl   0x0(%rax)
  3b:	f3 0f 1e fa          	endbr64
  3f:	65                   	gs