lkml.org 
[lkml]   [2022]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
Subject[syzbot] general protection fault in virtio_gpu_object_create (2)
From
Hello,

syzbot found the following issue on:

HEAD commit: 089866061428 Merge tag 'libnvdimm-fixes-5.19-rc5' of git:/..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15ce44ec080000
kernel config: https://syzkaller.appspot.com/x/.config?x=3a010dbf6a7af480
dashboard link: https://syzkaller.appspot.com/bug?extid=2f09dba03ce3f3b0a2cf
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13650150080000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16687b6c080000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2f09dba03ce3f3b0a2cf@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 3668 Comm: syz-executor918 Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:virtio_gpu_object_shmem_init drivers/gpu/drm/virtio/virtgpu_object.c:183 [inline]
RIP: 0010:virtio_gpu_object_create+0x29b/0xd90 drivers/gpu/drm/virtio/virtgpu_object.c:249
Code: 89 de e8 98 3c ed fc 48 85 db 0f 85 9f 03 00 00 e8 2a 40 ed fc 49 8d 7f 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82
RSP: 0018:ffffc90002e5fad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff848c5756 RDI: 0000000000000000
RBP: ffff88802286b800 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90002e5fbd0
R13: ffff88801c4c0010 R14: ffff88801c4c0000 R15: fffffffffffffff4
FS: 0000555556654300(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa12e2a42a4 CR3: 0000000015c4e000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
virtio_gpu_gem_create drivers/gpu/drm/virtio/virtgpu_gem.c:42 [inline]
virtio_gpu_mode_dumb_create+0x319/0x5c0 drivers/gpu/drm/virtio/virtgpu_gem.c:90
drm_mode_create_dumb+0x26c/0x2f0 drivers/gpu/drm/drm_dumb_buffers.c:96
drm_ioctl_kernel+0x27d/0x4e0 drivers/gpu/drm/drm_ioctl.c:782
drm_ioctl+0x51e/0x9d0 drivers/gpu/drm/drm_ioctl.c:885
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7fa12e24c699
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff25d83428 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fa12e24c699
RDX: 0000000020000000 RSI: 00000000c02064b2 RDI: 0000000000000003
RBP: 00007fff25d83440 R08: 0000000000000002 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:virtio_gpu_object_shmem_init drivers/gpu/drm/virtio/virtgpu_object.c:183 [inline]
RIP: 0010:virtio_gpu_object_create+0x29b/0xd90 drivers/gpu/drm/virtio/virtgpu_object.c:249
Code: 89 de e8 98 3c ed fc 48 85 db 0f 85 9f 03 00 00 e8 2a 40 ed fc 49 8d 7f 0c 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 82
RSP: 0018:ffffc90002e5fad0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff848c5756 RDI: 0000000000000000
RBP: ffff88802286b800 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffffc90002e5fbd0
R13: ffff88801c4c0010 R14: ffff88801c4c0000 R15: fffffffffffffff4
FS: 0000555556654300(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa12e2a42a4 CR3: 0000000015c4e000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 89 de mov %ebx,%esi
2: e8 98 3c ed fc callq 0xfced3c9f
7: 48 85 db test %rbx,%rbx
a: 0f 85 9f 03 00 00 jne 0x3af
10: e8 2a 40 ed fc callq 0xfced403f
15: 49 8d 7f 0c lea 0xc(%r15),%rdi
19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
20: fc ff df
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 0f b6 14 02 movzbl (%rdx,%rax,1),%edx <-- trapping instruction
2e: 48 89 f8 mov %rdi,%rax
31: 83 e0 07 and $0x7,%eax
34: 83 c0 03 add $0x3,%eax
37: 38 d0 cmp %dl,%al
39: 7c 08 jl 0x43
3b: 84 d2 test %dl,%dl
3d: 0f .byte 0xf
3e: 85 .byte 0x85
3f: 82 .byte 0x82


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

\
 
 \ /
  Last update: 2022-07-06 20:17    [W:0.036 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site