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Message-ID: <6773ef06.050a0220.2f3838.04e1.GAE@google.com>
Date: Tue, 31 Dec 2024 05:17:58 -0800
From: syzbot <syzbot+43f6243d6c4946b26405@...kaller.appspotmail.com>
To: eric.dumazet@...il.com
Cc: eric.dumazet@...il.com, linux-fsdevel@...r.kernel.org,
linux-kernel@...r.kernel.org, miklos@...redi.hu,
syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: [syzbot] [fuse?] BUG: unable to handle kernel NULL pointer
dereference in fuse_copy_one
>
> On 12/31/24 2:10 PM, syzbot wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit: ccb98ccef0e5 Merge tag 'platform-drivers-x86-v6.13-4' of g..
>> git tree: upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=14d4f50f980000
>> kernel config: https://syzkaller.appspot.com/x/.config?x=86dd15278dbfe19f
>> dashboard link: https://syzkaller.appspot.com/bug?extid=43f6243d6c4946b26405
>> compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
>> userspace arch: i386
>>
>> Unfortunately, I don't have any reproducer for this issue yet.
>>
>> Downloadable assets:
>> disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-ccb98cce.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/75a6223b351c/vmlinux-ccb98cce.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/beea89d50f58/bzImage-ccb98cce.xz
>>
>> IMPORTANT: if you fix the issue, please add the following tag to the commit:
>> Reported-by: syzbot+43f6243d6c4946b26405@...kaller.appspotmail.com
>>
>> BUG: kernel NULL pointer dereference, address: 0000000000000000
>> #PF: supervisor write access in kernel mode
>> #PF: error_code(0x0002) - not-present page
>> PGD 6a754067 P4D 6a754067 PUD 68142067 PMD 0
>> Oops: Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI
>> CPU: 0 UID: 0 PID: 7523 Comm: syz.2.395 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
>> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
>> RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38
>> Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 <f3> a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90
>> RSP: 0018:ffffc9000370f8b0 EFLAGS: 00010293
>> RAX: 0000000000000000 RBX: ffffc9000370fc50 RCX: 0000000000000004
>> RDX: 0000000000000004 RSI: ffff88804ef5d710 RDI: 0000000000000000
>> RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
>> R13: 0000000000000000 R14: 0000000000000004 R15: dffffc0000000000
>> FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5080b40
>> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 0000000000000000 CR3: 000000006ba72000 CR4: 0000000000352ef0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <TASK>
>> fuse_copy_do fs/fuse/dev.c:809 [inline]
>> fuse_copy_one+0x1cc/0x230 fs/fuse/dev.c:1065
>> fuse_copy_args+0x109/0x690 fs/fuse/dev.c:1083
>> copy_out_args fs/fuse/dev.c:1966 [inline]
>> fuse_dev_do_write+0x1b0a/0x3100 fs/fuse/dev.c:2052
>> fuse_dev_write+0x160/0x1f0 fs/fuse/dev.c:2087
>> new_sync_write fs/read_write.c:586 [inline]
>> vfs_write+0x5ae/0x1150 fs/read_write.c:679
>> ksys_write+0x12b/0x250 fs/read_write.c:731
>> do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
>> __do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
>> do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
>> entry_SYSENTER_compat_after_hwframe+0x84/0x8e
>> RIP: 0023:0xf708e579
>> Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
>> RSP: 002b:00000000f5080500 EFLAGS: 00000293 ORIG_RAX: 0000000000000004
>> RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020000700
>> RDX: 0000000000000014 RSI: 00000000f73c3ff4 RDI: 0000000000000000
>> RBP: 0000000020008380 R08: 0000000000000000 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
>> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
>> </TASK>
>> Modules linked in:
>> CR2: 0000000000000000
>> ---[ end trace 0000000000000000 ]---
>> RIP: 0010:memcpy+0xc/0x20 arch/x86/lib/memcpy_64.S:38
>> Code: e9 44 fd ff ff 66 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 48 89 f8 48 89 d1 <f3> a4 c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90
>> RSP: 0018:ffffc9000370f8b0 EFLAGS: 00010293
>> RAX: 0000000000000000 RBX: ffffc9000370fc50 RCX: 0000000000000004
>> RDX: 0000000000000004 RSI: ffff88804ef5d710 RDI: 0000000000000000
>> RBP: 0000000000000004 R08: 0000000000000005 R09: 0000000000000000
>> R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000004
>> R13: 0000000000000000 R14: 0000000000000004 R15: dffffc0000000000
>> FS: 0000000000000000(0000) GS:ffff88802b400000(0063) knlGS:00000000f5080b40
>> CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
>> CR2: 0000000000000000 CR3: 000000006ba72000 CR4: 0000000000352ef0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> ----------------
>> Code disassembly (best guess):
>> 0: e9 44 fd ff ff jmp 0xfffffd49
>> 5: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
>> c: 00 00
>> e: 90 nop
>> f: 90 nop
>> 10: 90 nop
>> 11: 90 nop
>> 12: 90 nop
>> 13: 90 nop
>> 14: 90 nop
>> 15: 90 nop
>> 16: 90 nop
>> 17: 90 nop
>> 18: 90 nop
>> 19: 90 nop
>> 1a: 90 nop
>> 1b: 90 nop
>> 1c: 90 nop
>> 1d: 90 nop
>> 1e: f3 0f 1e fa endbr64
>> 22: 66 90 xchg %ax,%ax
>> 24: 48 89 f8 mov %rdi,%rax
>> 27: 48 89 d1 mov %rdx,%rcx
>> * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction
>> 2c: c3 ret
>> 2d: cc int3
>> 2e: cc int3
>> 2f: cc int3
>> 30: cc int3
>> 31: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
>> 38: 00 00 00 00
>> 3c: 66 90 xchg %ax,%ax
>> 3e: 90 nop
>> 3f: 90 nop
>>
>>
>> ---
>> 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 report is already addressed, let syzbot know by replying with:
>> #syz fix: exact-commit-title
>>
>> If you want to overwrite report's subsystems, reply with:
>> #syz set subsystems: new-subsystem
>> (See the list of subsystem names on the web dashboard)
>>
>> If the report is a duplicate of another one, reply with:
>> #syz dup: exact-subject-of-another-report
>>
>> If you want to undo deduplication, reply with:
>> #syz undup
>>
> Bug origin in
>
> commit ebe559609d7829b52c6642b581860760984faf9d
> Author: Al Viro <viro@...iv.linux.org.uk>
> Date: Fri Nov 15 10:30:14 2024 -0500
>
> fs: get rid of __FMODE_NONOTIFY kludge
>
> #syz test
This crash does not have a reproducer. I cannot test it.
>
> diff --git a/fs/notify/fanotify/fanotify_user.c
> b/fs/notify/fanotify/fanotify_user.c
> index 19435cd2c41f..6ff94e312232 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -1624,8 +1624,8 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int,
> flags, unsigned int, event_f_flags)
> file = anon_inode_getfile_fmode("[fanotify]", &fanotify_fops,
> group,
> f_flags, FMODE_NONOTIFY);
> if (IS_ERR(file)) {
> - fd = PTR_ERR(file);
> put_unused_fd(fd);
> + fd = PTR_ERR(file);
> goto out_destroy_group;
> }
> fd_install(fd, file);
>
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