Bug 244351 - [7] Kernel panic observed while plugging the UFS USB drive on FreeBSD13-CURRENT, FreeBSD 12.1-RELEASE r354233 and FreeBSD 12.1-STABLE r358121
Summary: [7] Kernel panic observed while plugging the UFS USB drive on FreeBSD13-CURRE...
Status: Closed FIXED
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: CURRENT
Hardware: Any Any
: --- Affects Only Me
Assignee: freebsd-fs (Nobody)
URL:
Keywords:
Depends on:
Blocks: 244384 263979
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Reported: 2020-02-23 20:26 UTC by Neeraj
Modified: 2022-11-18 23:25 UTC (History)
3 users (show)

See Also:

Attachments
Contains PoC UFS image and detailed logs includes 13-current, 12.1-release and 12.1-stable (155 bytes, text/plain)
2020-02-23 20:26 UTC, Neeraj 		no flags Details
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Description Neeraj 2020-02-23 20:26:49 UTC 
Created attachment 211873 [details]
Contains PoC UFS image and detailed logs includes 13-current, 12.1-release and 12.1-stable

Hi there,

Kernel Panic is observed while mounting the usb drive which contains malicious UFS filesystem image.

But if the automount is configured or user has ability to mount the usb drive then during mount kernel panic occurs.

No user authentication and interaction is needed in case of automount is configured, tested with "/etc/fstab".

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, then mount it.

[Kernel Log - FreeBSD 13-CURRENT]

freebsd dumped core - see /var/crash/vmcore.4

Wed Feb 19 18:50:05 UTC 2020

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

panic: usermode va fffffdffb39cb000

GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "amd64-marcel-freebsd"...

Unread portion of the kernel message buffer:
panic: usermode va fffffdffb39cb000
cpuid = 0
time = 1582138127
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0039f1d3d0
vpanic() at vpanic+0x185/frame 0xfffffe0039f1d430
panic() at panic+0x43/frame 0xfffffe0039f1d490
pmap_pinit0() at pmap_pinit0/frame 0xfffffe0039f1d4a0
allocbuf() at allocbuf+0x1fc/frame 0xfffffe0039f1d500
getblkx() at getblkx+0x6d9/frame 0xfffffe0039f1d5d0
getblk() at getblk+0x22/frame 0xfffffe0039f1d600
ffs_mount() at ffs_mount+0x1be0/frame 0xfffffe0039f1d7b0
vfs_domount() at vfs_domount+0x83c/frame 0xfffffe0039f1d9e0
vfs_donmount() at vfs_donmount+0x911/frame 0xfffffe0039f1da80
sys_nmount() at sys_nmount+0x69/frame 0xfffffe0039f1dac0
amd64_syscall() at amd64_syscall+0x168/frame 0xfffffe0039f1dbf0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe0039f1dbf0
--- syscall (378, FreeBSD ELF64, sys_nmount), rip = 0x8002f7a1a, rsp = 0x7fffffffd3b8, rbp = 0x7fffffffd920 ---
KDB: enter: panic
Uptime: 6m53s
Dumping 262 out of 4062 MB:..7%..13%..25%..31%..43%..55%..61%..74%..86%..92%


[Attachments]
+ UFS filesystem image
+ detailed logs from FreeBSD 13-CURRENT, 12.1-RELEASE, and 12.1-STABLE.
Comment 1 Kirk McKusick freebsd_committer freebsd_triage 2022-05-16 00:25:01 UTC 
Please check to see if my proposed change in https://reviews.freebsd.org/D35219 resolves this bug.
Comment 2 Kirk McKusick freebsd_committer freebsd_triage 2022-11-18 23:25:32 UTC 
Fixed in 14 as detailed in https://reviews.freebsd.org/D35219

MFC'ed to 13 with commit b999366aab4e2d59cb8869b0e5ef0f70ab9b9bbe on Fri May 27 12:21:11 2022 -0700

Too old in 12 life to be candidate for MFC.