[Bug 244342] Kernel panic observed while plugging the UFS USB drive on FreeBSD13-CURRENT, FreeBSD 12.1-RELEASE r354233 and FreeBSD 12.1-STABLE r358121

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244342

            Bug ID: 244342
           Summary: Kernel panic observed while plugging the UFS USB drive
                    on FreeBSD13-CURRENT, FreeBSD 12.1-RELEASE r354233 and
                    FreeBSD 12.1-STABLE r358121
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: neerajpal09 at gmail.com

Hi there,

Kernel Panic is observed while attaching the usb drive which contains malicious
UFS filesystem image. No user authentication and interaction is needed.

Just flash the attached UFS image to usb drive and plug the usb drive to
FreeBSD 13-CURRENT, 12.1-RELEASE, or 12.1-STABLE.


[Kernel Log - FreeBSD 13-CURRENT]

freebsd dumped core - see /var/crash/vmcore.8

Wed Feb 19 16:29:20 UTC 2020

FreeBSD freebsd 13.0-CURRENT FreeBSD 13.0-CURRENT #0: Wed Feb 19
01:58:08 UTC 2020
root at freebsd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC  amd64

panic: g_read_data(): invalid length 11866112

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This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
Superblock check-hash failed: recorded check-hash 0x11bd7e03 !=
computed check-hash 0x10378f61 (Ignored)
panic: g_read_data(): invalid length 11866112
cpuid = 3
time = 1582129685
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe002c779870
vpanic() at vpanic+0x185/frame 0xfffffe002c7798d0
panic() at panic+0x43/frame 0xfffffe002c779930
g_read_data() at g_read_data+0xf9/frame 0xfffffe002c779970
g_use_g_read_data() at g_use_g_read_data+0x35/frame 0xfffffe002c779990
ffs_sbget() at ffs_sbget+0x24f/frame 0xfffffe002c779a00
g_label_ufs_taste_common() at g_label_ufs_taste_common+0x79/frame
0xfffffe002c779a40
g_label_taste() at g_label_taste+0x2ac/frame 0xfffffe002c779b50
g_new_provider_event() at g_new_provider_event+0xaa/frame 0xfffffe002c779b70
g_run_events() at g_run_events+0x176/frame 0xfffffe002c779bb0
fork_exit() at fork_exit+0x80/frame 0xfffffe002c779bf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe002c779bf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
Uptime: 15m6s
Dumping 268 out of 4062 MB:..6%..12%..24%..36%..42%..54%..66%..72%..84%..96%

[Attachments]
+ UFS filesystem image
+ detailed logs from FreeBSD 13-CURRENT, 12.1-RELEASE, and 12.1-STABLE.

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