From: Oliver Neukum <oneukum@suse.com>
To: syzbot <syzbot+28748250ab47a8f04100@syzkaller.appspotmail.com>,
bvanassche@acm.org, emilne@redhat.com,
gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org,
linux-usb@vger.kernel.org, martin.petersen@oracle.com,
stern@rowland.harvard.edu, syzkaller-bugs@googlegroups.com,
tasos@tasossah.com, usb-storage@lists.one-eyed-alien.net
Subject: Re: [syzbot] [usb-storage?] divide error in isd200_ata_command
Date: Mon, 26 Feb 2024 11:59:06 +0100 [thread overview]
Message-ID: <99b0fb1b-37b3-4da4-8129-e502ed8e479a@suse.com> (raw)
In-Reply-To: <0000000000003eb868061245ba7f@google.com>
Hi,
On 26.02.24 10:42, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=114e10e4180000
> kernel config: https://syzkaller.appspot.com/x/.config?x=eff9f3183d0a20dd
> dashboard link: https://syzkaller.appspot.com/bug?extid=28748250ab47a8f04100
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1064b372180000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10aca6ac180000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/c55ca1fdc5ad/disk-f2e367d6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/4556a82fb4ed/vmlinux-f2e367d6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/95338ed9dad1/bzImage-f2e367d6.xz
>
> The issue was bisected to:
>
> commit 321da3dc1f3c92a12e3c5da934090d2992a8814c
> Author: Martin K. Petersen <martin.petersen@oracle.com>
> Date: Tue Feb 13 14:33:06 2024 +0000
>
> scsi: sd: usb_storage: uas: Access media prior to querying device properties
preliminary analysis:
It oopses here:
} else {
if (!id[ATA_ID_SECTORS] || !id[ATA_ID_HEADS])
goto too_early;
sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1);
cylinder = (u16)(lba / (id[ATA_ID_SECTORS] *
id[ATA_ID_HEADS]));
in isd200_scsi_to_ata() because it must not be called before isd200_get_inquiry_data()
has completed.
That raises two questions.
1) should we limit the read_before_ms flag to the cases transparent SCSI is used?
2) does isd200_get_inquiry_data() need to validate what it reads?
Regards
Oliver
next prev parent reply other threads:[~2024-02-26 10:59 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-26 9:42 [syzbot] [usb-storage?] divide error in isd200_ata_command syzbot
2024-02-26 10:59 ` Oliver Neukum [this message]
2024-02-26 18:13 ` Alan Stern
2024-02-27 2:46 ` Martin K. Petersen
2024-02-27 3:05 ` Alan Stern
2024-02-28 16:20 ` Oliver Neukum
2024-02-28 19:23 ` Alan Stern
2024-02-27 19:36 ` Alan Stern
2024-02-28 5:20 ` syzbot
2024-02-28 16:12 ` Alan Stern
2024-02-28 16:13 ` syzbot
2024-02-28 16:52 ` Aleksandr Nogikh
2024-02-28 19:18 ` Alan Stern
2024-02-29 0:33 ` syzbot
2024-02-29 19:30 ` [PATCH] USB: usb-storage: Prevent divide-by-0 " Alan Stern
2024-03-01 1:11 ` Martin K. Petersen
2024-03-01 11:36 ` PrasannaKumar Muralidharan
2024-02-29 15:40 ` [syzbot] [usb-storage?] divide " Aleksandr Nogikh
2024-02-29 16:12 ` Alan Stern
2024-02-29 17:57 ` Aleksandr Nogikh
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