linux-kernel - BUG: unable to handle kernel paging request in drm_fb_helper_damage

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Date:   Mon, 20 Sep 2021 20:55:28 +0800
From:   Hao Sun <sunhao.th@...il.com>
To:     bp@...en8.de, hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
        x86@...nel.org
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: BUG: unable to handle kernel paging request in drm_fb_helper_damage_work

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2
git tree: upstream
console output:
https://drive.google.com/file/d/13NUxvBLIswpoS8NOOAaq9PjOKgTYN19K/view?usp=sharing
kernel config: https://drive.google.com/file/d/1HKZtF_s3l6PL3OoQbNq_ei9CdBus-Tz0/view?usp=sharing

Sorry, I don't have a reproducer for this crash, hope the symbolized
report can help.
If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@...il.com>

BUG: unable to handle page fault for address: ffffc90003d79000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 8c00067 P4D 8c00067 PUD 8d63067 PMD 104409067 PTE 0
Oops: 0000 [#1] PREEMPT SMP
CPU: 2 PID: 3032 Comm: kworker/2:2 Not tainted 5.15.0-rc1+ #19
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
Workqueue: events drm_fb_helper_damage_work
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x48/0xa0 arch/x86/lib/iomem.c:57
Code: 01 75 41 e8 4a 0d 04 ff 49 83 fc 01 76 0a e8 3f 0d 04 ff f6 c3
02 75 44 e8 35 0d 04 ff 4c 89 e1 48 89 df 48 89 ee 48 c1 e9 02 <f3> a5
41 f6 c4 02 74 02 66 a5 41 f6 c4 01 74 01 a4 5b 5d 41 5c e9
RSP: 0018:ffffc9000088fda8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffffc90005aff000 RCX: 0000000000000100
RDX: ffff88800f132240 RSI: ffffc90003d79000 RDI: ffffc90005b00000
RBP: ffffc90003d78000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000088fdc8 R11: 0000000000000004 R12: 0000000000001400
R13: ffff888101fc7000 R14: 00000000000002ff R15: ffffc90003d78000
FS:  0000000000000000(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003d79000 CR3: 000000010ea77000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 dma_buf_map_memcpy_to include/linux/dma-buf-map.h:245 [inline]
 drm_fb_helper_damage_blit_real drivers/gpu/drm/drm_fb_helper.c:388 [inline]
 drm_fb_helper_damage_blit drivers/gpu/drm/drm_fb_helper.c:419 [inline]
 drm_fb_helper_damage_work+0x30e/0x380 drivers/gpu/drm/drm_fb_helper.c:450
 process_one_work+0x359/0x850 kernel/workqueue.c:2297
 worker_thread+0x41/0x4d0 kernel/workqueue.c:2444
 kthread+0x178/0x1b0 kernel/kthread.c:319
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: ffffc90003d79000
---[ end trace e1f0ecb0884517c4 ]---
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x48/0xa0 arch/x86/lib/iomem.c:57
Code: 01 75 41 e8 4a 0d 04 ff 49 83 fc 01 76 0a e8 3f 0d 04 ff f6 c3
02 75 44 e8 35 0d 04 ff 4c 89 e1 48 89 df 48 89 ee 48 c1 e9 02 <f3> a5
41 f6 c4 02 74 02 66 a5 41 f6 c4 01 74 01 a4 5b 5d 41 5c e9
RSP: 0018:ffffc9000088fda8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: ffffc90005aff000 RCX: 0000000000000100
RDX: ffff88800f132240 RSI: ffffc90003d79000 RDI: ffffc90005b00000
RBP: ffffc90003d78000 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000088fdc8 R11: 0000000000000004 R12: 0000000000001400
R13: ffff888101fc7000 R14: 00000000000002ff R15: ffffc90003d78000
FS:  0000000000000000(0000) GS:ffff88807dd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90003d79000 CR3: 000000010ea77000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
----------------
Code disassembly (best guess):
   0:   01 75 41                add    %esi,0x41(%rbp)
   3:   e8 4a 0d 04 ff          callq  0xff040d52
   8:   49 83 fc 01             cmp    $0x1,%r12
   c:   76 0a                   jbe    0x18
   e:   e8 3f 0d 04 ff          callq  0xff040d52
  13:   f6 c3 02                test   $0x2,%bl
  16:   75 44                   jne    0x5c
  18:   e8 35 0d 04 ff          callq  0xff040d52
  1d:   4c 89 e1                mov    %r12,%rcx
  20:   48 89 df                mov    %rbx,%rdi
  23:   48 89 ee                mov    %rbp,%rsi
  26:   48 c1 e9 02             shr    $0x2,%rcx
* 2a:   f3 a5                   rep movsl %ds:(%rsi),%es:(%rdi) <--
trapping instruction
  2c:   41 f6 c4 02             test   $0x2,%r12b
  30:   74 02                   je     0x34
  32:   66 a5                   movsw  %ds:(%rsi),%es:(%rdi)
  34:   41 f6 c4 01             test   $0x1,%r12b
  38:   74 01                   je     0x3b
  3a:   a4                      movsb  %ds:(%rsi),%es:(%rdi)
  3b:   5b                      pop    %rbx
  3c:   5d                      pop    %rbp
  3d:   41 5c                   pop    %r12
  3f:   e9                      .byte 0xe9