linux-kernel - general protection fault in efivar

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Date:   Fri, 27 Jan 2023 23:49:55 +0000
From:   Sanan Hasanov <sanan.hasanov@...ghts.ucf.edu>
To:     "ardb@...nel.org" <ardb@...nel.org>,
        "linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "contact@...zz.com" <contact@...zz.com>,
        "syzkaller@...glegroups.com" <syzkaller@...glegroups.com>
Subject: general protection fault in efivar_lock

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-rc5-next-20230125
Kernel config: https://drive.google.com/file/d/1qDN6q_k12wcgp6dt4jfF4hpk3Ix5FaKX/view?usp=sharing
Reproducer: https://drive.google.com/file/d/11bfgp5hzObE2om0k0bNfeSIEf_SciGY1/view?usp=sharing

Thank you!

Best regards,
Sanan Hasanov

general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 4 PID: 27585 Comm: syz-executor.5 Not tainted 6.2.0-rc5-next-20230125 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:efivar_lock+0x4e/0xa0
Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b
RSP: 0018:ffff88802549fca8 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000
RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008
RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000
FS:  00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0
Call Trace:
 <TASK>
 efivar_entry_iter+0x29/0x150
 efivarfs_kill_sb+0x2f/0x40
 deactivate_locked_super+0xa6/0x190
 vfs_get_super+0x235/0x2b0
 get_tree_single+0x2b/0x40
 efivarfs_get_tree+0x21/0x30
 vfs_get_tree+0x97/0x370
 __do_sys_fsconfig+0x981/0xd20
 __x64_sys_fsconfig+0xc1/0x150
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fafd8e8edcd
Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fafd9f82bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007fafd8fbbf80 RCX: 00007fafd8e8edcd
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004
RBP: 00007fafd8efc59c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff23221a7f R14: 00007fff23221c20 R15: 00007fafd9f82d80
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:efivar_lock+0x4e/0xa0
Code: a8 28 0f fc 45 85 e4 75 3f e8 ee 2c 0f fc 48 8b 1d b7 aa c5 05 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 83 7b 08 00 74 19 e8 c0 2c 0f fc 44 89 e0 5b
RSP: 0018:ffff88802549fca8 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90003cb0000
RDX: 0000000000000001 RSI: ffffffff85792a42 RDI: 0000000000000008
RBP: ffff88802549fcb8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff82595920 R15: 0000000000000000
FS:  00007fafd9f83700(0000) GS:ffff88811a800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9e23270d78 CR3: 00000000233bb000 CR4: 0000000000350ee0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	28 0f                	sub    %cl,(%rdi)
   2:	fc                   	cld
   3:	45 85 e4             	test   %r12d,%r12d
   6:	75 3f                	jne    0x47
   8:	e8 ee 2c 0f fc       	call   0xfc0f2cfb
   d:	48 8b 1d b7 aa c5 05 	mov    0x5c5aab7(%rip),%rbx        # 0x5c5aacb
  14:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1b:	fc ff df
  1e:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  22:	48 89 fa             	mov    %rdi,%rdx
  25:	48 c1 ea 03          	shr    $0x3,%rdx
* 29:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2d:	75 39                	jne    0x68
  2f:	48 83 7b 08 00       	cmpq   $0x0,0x8(%rbx)
  34:	74 19                	je     0x4f
  36:	e8 c0 2c 0f fc       	call   0xfc0f2cfb
  3b:	44 89 e0             	mov    %r12d,%eax
  3e:	5b                   	pop    %rbx