linux-kernel - general protection fault in bio_associate_blkg_from

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Message-ID: <CAJg=8jwFexnoTfPLg=Yd44WFVn05wAn0UgH6=baipc53mDxgyQ@mail.gmail.com>
Date: Fri, 19 Apr 2024 21:39:53 -0700
From: Marius Fleischer <fleischermarius@...il.com>
To: Tejun Heo <tj@...nel.org>, Jens Axboe <axboe@...nel.dk>, cgroups@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Cc: syzkaller@...glegroups.com, harrisonmichaelgreen@...il.com
Subject: general protection fault in bio_associate_blkg_from_css

Hi,


We would like to report the following bug which has been found by our
modified version of syzkaller.

======================================================

description: general protection fault in bio_associate_blkg_from_css

affected file: block/blk-cgroup.c

kernel version: 5.15.156

kernel commit: c52b9710c83d3b8ab63bb217cc7c8b61e13f12cd

git tree: upstream

kernel config: attached

crash reproducer: attached

======================================================

Crash log:

general protection fault, probably for non-canonical address
0xdffffc00000000ba: 0000 [#1] PREEMPT SMP KASAN

KASAN: null-ptr-deref in range [0x00000000000005d0-0x00000000000005d7]

CPU: 1 PID: 6609 Comm: syz-executor.3 Not tainted 5.15.156 #1

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1
04/01/2014

RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1831 [inline]

RIP: 0010:bio_associate_blkg_from_css+0x134/0x1050 block/blk-cgroup.c:1865

Code: 80 3c 02 00 0f 85 f0 0d 00 00 48 8b 04 24 48 8b 58 08 48 b8 00 00 00
00 00 fc ff df 48 8d bb d0 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f
85 d0 0d 00 00 48 8b 9b d0 05 00 00 48 b8 00 00 00

RSP: 0018:ffffc90001b9fa40 EFLAGS: 00010202

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83c79b2c

RDX: 00000000000000ba RSI: ffffffff83c78fd1 RDI: 00000000000005d0

RBP: ffff88802077bb40 R08: 0000000000000000 R09: ffffffff8fd95a27

R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804cb71000

R13: ffff888090f74000 R14: 0000000000000000 R15: ffff88804cb71000

FS:  000055555585b480(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000

CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f8452584000 CR3: 00000000363bf000 CR4: 0000000000750ee0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400

PKRU: 55555554

Call Trace:

 <TASK>

 bio_associate_blkg+0xcd/0x410 block/blk-cgroup.c:1893

 lbmStartIO+0x1eb/0x430 fs/jfs/jfs_logmgr.c:2130

 lbmWrite+0x2ea/0x420 fs/jfs/jfs_logmgr.c:2079

 lmNextPage.isra.0+0x285/0x720 fs/jfs/jfs_logmgr.c:624

 lmWriteRecord+0xa90/0x1140 fs/jfs/jfs_logmgr.c:537

 lmLogSync+0x155/0x780 fs/jfs/jfs_logmgr.c:977

 jfs_syncpt+0x89/0xa0 fs/jfs/jfs_logmgr.c:1049

 jfs_sync_fs+0x80/0xa0 fs/jfs/super.c:690

 sync_filesystem fs/sync.c:56 [inline]

 sync_filesystem+0x105/0x280 fs/sync.c:30

 generic_shutdown_super+0x70/0x380 fs/super.c:448

 kill_block_super+0x97/0xf0 fs/super.c:1414

 deactivate_locked_super+0x94/0x160 fs/super.c:335

 deactivate_super+0xad/0xd0 fs/super.c:366

 cleanup_mnt+0x3a2/0x540 fs/namespace.c:1143

 task_work_run+0xdd/0x1a0 kernel/task_work.c:164

 tracehook_notify_resume include/linux/tracehook.h:189 [inline]

 exit_to_user_mode_loop kernel/entry/common.c:181 [inline]

 exit_to_user_mode_prepare+0x253/0x280 kernel/entry/common.c:214

 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]

 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:307

 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86

 entry_SYSCALL_64_after_hwframe+0x66/0xd0

RIP: 0033:0x7ff1dd48674b

Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 90 f3 0f 1e fa 31 f6 e9 05
00 00 00 0f 1f 44 00 00 f3 0f 1e fa b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff
ff 77 05 c3 0f 1f 40 00 48 c7 c2 b0 ff ff ff f7 d8

RSP: 002b:00007fffe4a91848 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007ff1dd48674b

RDX: 00007ff1dd41e280 RSI: 000000000000000a RDI: 00007fffe4a91900

RBP: 00007fffe4a91900 R08: 0000000000000000 R09: 00007fffe4a916d0

R10: 000055555585ca63 R11: 0000000000000246 R12: 00007ff1dd4e5312

R13: 00007fffe4a929e0 R14: 000055555585c970 R15: 00007fffe4a929d0

 </TASK>

Modules linked in:

---[ end trace 4d6e710b0359a28f ]---

RIP: 0010:blkg_tryget_closest block/blk-cgroup.c:1831 [inline]

RIP: 0010:bio_associate_blkg_from_css+0x134/0x1050 block/blk-cgroup.c:1865

Code: 80 3c 02 00 0f 85 f0 0d 00 00 48 8b 04 24 48 8b 58 08 48 b8 00 00 00
00 00 fc ff df 48 8d bb d0 05 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f
85 d0 0d 00 00 48 8b 9b d0 05 00 00 48 b8 00 00 00

RSP: 0018:ffffc90001b9fa40 EFLAGS: 00010202

RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff83c79b2c

RDX: 00000000000000ba RSI: ffffffff83c78fd1 RDI: 00000000000005d0

RBP: ffff88802077bb40 R08: 0000000000000000 R09: ffffffff8fd95a27

R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804cb71000

R13: ffff888090f74000 R14: 0000000000000000 R15: ffff88804cb71000

FS:  000055555585b480(0000) GS:ffff888063e00000(0000) knlGS:0000000000000000

CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00005555558a99a8 CR3: 00000000363bf000 CR4: 0000000000750ef0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400

PKRU: 55555554

----------------

Code disassembly (best guess):

   0:    80 3c 02 00     cmpb   $0x0,(%rdx,%rax,1)

   4:    0f 85 f0 0d 00 00   jne 0xdfa

   a:    48 8b 04 24     mov (%rsp),%rax

   e:    48 8b 58 08     mov 0x8(%rax),%rbx

  12:    48 b8 00 00 00 00 00     movabs $0xdffffc0000000000,%rax

  19:    fc ff df

  1c:    48 8d bb d0 05 00 00     lea 0x5d0(%rbx),%rdi

  23:    48 89 fa        mov %rdi,%rdx

  26:    48 c1 ea 03     shr $0x3,%rdx

* 2a:    80 3c 02 00     cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction

  2e:    0f 85 d0 0d 00 00   jne 0xe04

  34:    48 8b 9b d0 05 00 00     mov 0x5d0(%rbx),%rbx

  3b:    48              rex.W

  3c:    b8              .byte 0xb8

  3d:    00 00           add %al,(%rax)

======================================================


Wishing you a lovely day!


Best,

Marius

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