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Message-ID: <000000000000318ac80600f80ada@google.com>
Date: Thu, 20 Jul 2023 21:53:03 -0700
From: syzbot <syzbot+a8bd07230391c0c577c2@...kaller.appspotmail.com>
To: gregkh@...uxfoundation.org, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, rafael@...nel.org,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] [fs?] general protection fault in iommu_deinit_device
Hello,
syzbot found the following issue on:
HEAD commit: 2205be537aeb Add linux-next specific files for 20230717
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=110613faa80000
kernel config: https://syzkaller.appspot.com/x/.config?x=173c0f005722ecc3
dashboard link: https://syzkaller.appspot.com/bug?extid=a8bd07230391c0c577c2
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10e4f18ea80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1480be3ea80000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/30f27c4289e7/disk-2205be53.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/67e0e47344f7/vmlinux-2205be53.xz
kernel image: https://storage.googleapis.com/syzbot-assets/e542d8c69716/bzImage-2205be53.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a8bd07230391c0c577c2@...kaller.appspotmail.com
iommufd_mock iommufd_mock0: Adding to iommu group 0
iommufd_mock iommufd_mock0: Removing from iommu group 0
general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 5031 Comm: syz-executor409 Not tainted 6.5.0-rc1-next-20230717-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/03/2023
RIP: 0010:sysfs_remove_link_from_group+0x2b/0x80 fs/sysfs/group.c:413
Code: 0f 1e fa 41 54 49 89 d4 55 48 89 f5 53 48 89 fb e8 ba 13 73 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 8b 7b 30 31 d2 48 89 ee e8 81 f2 fe ff 48 85
RSP: 0018:ffffc90003adfc18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8213b9d6 RDI: 0000000000000030
RBP: ffffffff8adb0760 R08: 0000000000000001 R09: ffffed10280ca11b
R10: ffff8881406508df R11: ffffffff8a345578 R12: ffff888022507500
R13: ffffffff8d519e20 R14: ffff888015ab8450 R15: ffff888015ab8448
FS: 00005555570f1380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000226b9000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
iommu_deinit_device+0x111/0x580 drivers/iommu/iommu.c:401
__iommu_group_remove_device+0x296/0x390 drivers/iommu/iommu.c:573
iommu_group_remove_device+0x7e/0xa0 drivers/iommu/iommu.c:1170
mock_dev_destroy drivers/iommu/iommufd/selftest.c:396 [inline]
iommufd_test_mock_domain drivers/iommu/iommufd/selftest.c:452 [inline]
iommufd_test+0x1b92/0x2c70 drivers/iommu/iommufd/selftest.c:950
iommufd_fops_ioctl+0x347/0x4d0 drivers/iommu/iommufd/main.c:337
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+0x18f/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f732a69e2e9
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 00 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:00007ffe820edd58 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ffe820edf28 RCX: 00007f732a69e2e9
RDX: 0000000020000100 RSI: 0000000000003ba0 RDI: 0000000000000003
RBP: 00007f732a711610 R08: 0000000000000000 R09: 00007ffe820edf28
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffe820edf18 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sysfs_remove_link_from_group+0x2b/0x80 fs/sysfs/group.c:413
Code: 0f 1e fa 41 54 49 89 d4 55 48 89 f5 53 48 89 fb e8 ba 13 73 ff 48 8d 7b 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 39 48 8b 7b 30 31 d2 48 89 ee e8 81 f2 fe ff 48 85
RSP: 0018:ffffc90003adfc18 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffffffff8213b9d6 RDI: 0000000000000030
RBP: ffffffff8adb0760 R08: 0000000000000001 R09: ffffed10280ca11b
R10: ffff8881406508df R11: ffffffff8a345578 R12: ffff888022507500
R13: ffffffff8d519e20 R14: ffff888015ab8450 R15: ffff888015ab8448
FS: 00005555570f1380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055d13f5f7530 CR3: 00000000226b9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 0f 1e fa nop %edx
3: 41 54 push %r12
5: 49 89 d4 mov %rdx,%r12
8: 55 push %rbp
9: 48 89 f5 mov %rsi,%rbp
c: 53 push %rbx
d: 48 89 fb mov %rdi,%rbx
10: e8 ba 13 73 ff call 0xff7313cf
15: 48 8d 7b 30 lea 0x30(%rbx),%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: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 75 39 jne 0x69
30: 48 8b 7b 30 mov 0x30(%rbx),%rdi
34: 31 d2 xor %edx,%edx
36: 48 89 ee mov %rbp,%rsi
39: e8 81 f2 fe ff call 0xfffef2bf
3e: 48 rex.W
3f: 85 .byte 0x85
---
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@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
If the bug is already fixed, let syzbot know by replying with:
#syz fix: exact-commit-title
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.
If you want to change bug's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)
If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report
If you want to undo deduplication, reply with:
#syz undup
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