Date: Thu, 2 Dec 1999 17:46:24 -0500 (EST) From: Trevor Johnson <trevor@jpj.net> To: FreeBSD-gnats-submit@freebsd.org Subject: kern/15230: use of write-protected FAT12 floppy causes panic Message-ID: <Pine.BSI.3.96.991202170052.27977A-100000@blues.jpj.net>
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>Number: 15230 >Category: kern >Synopsis: use of write-protected FAT12 floppy causes panic >Confidential: no >Severity: serious >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Dec 2 14:50:00 PST 1999 >Closed-Date: >Last-Modified: >Originator: Trevor Johnson (trevor@jpj.net) >Release: 3.3-STABLE >Organization: none >Environment: FreeBSD ws99.fusi.dom 3.3-19990924-STABLE FreeBSD 3.3-19990924-STABLE #0: Sun Sep 26 21:08:48 PDT 1999 root@myname.my.domain:/usr/src/sys/compile/topside i386 (kernel configuration appended to the "Fix" field) >Description: System crashes and reboots when a DOS-formatted floppy with the write-protect tab in the read-only position is used, then unmounted. I've also seen variations of this (one variation: I tried to remove files from the mounted floppy) with 3.3-RELEASE and 3.2-19990713-STABLE, under X and with syscons. It happens with double-density and high-density 3.5" disks in a high-density drive; I've not tried 5.25" ones. Under other operating systems, I saw no obvious defects in the disks or their contents. >How-To-Repeat: Put write-protected FAT12 floppy in drive. # mount_msdos /dev/fd0 /mnt # cd /mnt # scp * user@host:/path/ # cd / # sync # umount /mnt Wait for reboot. Run fsck manually if prompted to do so. >Fix: Unknown--perhaps the "-r" option to mount_msdos would make a difference, but IMO there should be a more graceful response when it it omitted, especially because some computers are operated remotely, without anyone present to examine write-protect tabs. It's also conceivable that someone might have a cron job which mounts and reads (or even tries to write!) a floppy while the comptuer is unattended. Perhaps the mount could fail, or a read-only mount could be made, and an error message generated in either case. # # GENERIC -- Generic machine with WD/AHx/NCR/BTx family disks # # For more information on this file, please read the handbook section on # Kernel Configuration Files: # # http://www.freebsd.org/handbook/kernelconfig-config.html # # The handbook is also available locally in /usr/share/doc/handbook # if you've installed the doc distribution, otherwise always see the # FreeBSD World Wide Web server (http://www.FreeBSD.ORG/) for the # latest information. # # An exhaustive list of options and more detailed explanations of the # device lines is also present in the ./LINT configuration file. If you are # in doubt as to the purpose or necessity of a line, check first in LINT. # # $Id: GENERIC,v 1.143.2.16 1999/07/02 04:04:53 jkh Exp $ machine "i386" #cpu "I386_CPU" #cpu "I486_CPU" #cpu "I586_CPU" cpu "I686_CPU" ident topside maxusers 32 #options MATH_EMULATE #Support for x87 emulation options INET #InterNETworking options FFS #Berkeley Fast Filesystem options FFS_ROOT #FFS usable as root device [keep this!] options MFS #Memory Filesystem options MFS_ROOT #MFS usable as root device, "MFS" req'ed options NFS #Network Filesystem options NFS_ROOT #NFS usable as root device, "NFS" req'ed options MSDOSFS #MSDOS Filesystem options "CD9660" #ISO 9660 Filesystem options "CD9660_ROOT" #CD-ROM usable as root. "CD9660" req'ed options PROCFS #Process filesystem options "COMPAT_43" #Compatible with BSD 4.3 [KEEP THIS!] options SCSI_DELAY=10000 #Be pessimistic about Joe SCSI device options UCONSOLE #Allow users to grab the console options FAILSAFE #Be conservative options USERCONFIG #boot -c editor options VISUAL_USERCONFIG #visual boot -c editor config kernel root on wd0 # To make an SMP kernel, the next two are needed #options SMP # Symmetric MultiProcessor Kernel #options APIC_IO # Symmetric (APIC) I/O # Optionally these may need tweaked, (defaults shown): #options NCPU=2 # number of CPUs #options NBUS=4 # number of busses #options NAPIC=1 # number of IO APICs #options NINTR=24 # number of INTs controller isa0 # Enable PnP support in the kernel. This allows you to automaticly # attach to PnP cards for drivers that support it and allows you to # configure cards from USERCONFIG. See pnp(4) for more info. controller pnp0 #controller eisa0 controller pci0 controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 disk fd0 at fdc0 drive 0 disk fd1 at fdc0 drive 1 #options "CMD640" # work around CMD640 chip deficiency controller wdc0 at isa? port "IO_WD1" bio irq 14 disk wd0 at wdc0 drive 0 disk wd1 at wdc0 drive 1 controller wdc1 at isa? port "IO_WD2" bio irq 15 disk wd2 at wdc1 drive 0 disk wd3 at wdc1 drive 1 options ATAPI #Enable ATAPI support for IDE bus options ATAPI_STATIC #Don't do it as an LKM device acd0 #IDE CD-ROM #device wfd0 #IDE Floppy (e.g. LS-120) # A single entry for any of these controllers (ncr, ahb, ahc) is # sufficient for any number of installed devices. #controller ncr0 #controller ahb0 #controller ahc0 #controller isp0 # This controller offers a number of configuration options, too many to # document here - see the LINT file in this directory and look up the # dpt0 entry there for much fuller documentation on this. controller dpt0 #controller adv0 at isa? port ? cam irq ? #controller adw0 #controller bt0 at isa? port ? cam irq ? controller aha0 at isa? port ? cam irq ? controller scbus0 device da0 device sa0 device pass0 device cd0 #Only need one of these, the code dynamically grows #device wt0 at isa? port 0x300 bio irq 5 drq 1 #device mcd0 at isa? port 0x300 bio irq 10 #controller matcd0 at isa? port 0x230 bio #device scd0 at isa? port 0x230 bio # atkbdc0 controlls both the keyboard and the PS/2 mouse controller atkbdc0 at isa? port IO_KBD tty device atkbd0 at isa? tty irq 1 device psm0 at isa? tty irq 12 device vga0 at isa? port ? conflicts # splash screen/screen saver #pseudo-device splash # syscons is the default console driver, resembling an SCO console device sc0 at isa? tty # Enable this and PCVT_FREEBSD for pcvt vt220 compatible console driver #device vt0 at isa? tty #options XSERVER # support for X server #options FAT_CURSOR # start with block cursor # If you have a ThinkPAD, uncomment this along with the rest of the PCVT lines #options PCVT_SCANSET=2 # IBM keyboards are non-std device npx0 at isa? port IO_NPX irq 13 # # Laptop support (see LINT for more options) # device apm0 at isa? disable flags 0x31 # Advanced Power Management # PCCARD (PCMCIA) support #controller card0 #device pcic0 at card? #device pcic1 at card? device sio0 at isa? port "IO_COM1" flags 0x10 tty irq 4 device sio1 at isa? port "IO_COM2" tty irq 3 device sio2 at isa? disable port "IO_COM3" tty irq 5 device sio3 at isa? disable port "IO_COM4" tty irq 9 # Parallel port device ppc0 at isa? port? flags 0x40 net irq 7 controller ppbus0 device lpt0 at ppbus? device plip0 at ppbus? device ppi0 at ppbus? #controller vpo0 at ppbus? # # The following Ethernet NICs are all PCI devices. # #device al0 # ADMtek AL981 (``Comet'') #device ax0 # ASIX AX88140A #device de0 # DEC/Intel DC21x4x (``Tulip'') #device fxp0 # Intel EtherExpress PRO/100B (82557, 82558) #device mx0 # Macronix 98713/98715/98725 (``PMAC'') #device pn0 # Lite-On 82c168/82c169 (``PNIC'') #device rl0 # RealTek 8129/8139 #device tl0 # Texas Instruments ThunderLAN #device tx0 # SMC 9432TX (83c170 ``EPIC'') #device vr0 # VIA Rhine, Rhine II #device vx0 # 3Com 3c590, 3c595 (``Vortex'') #device wb0 # Winbond W89C840F #device xl0 # 3Com 3c90x (``Boomerang'', ``Cyclone'') # Order is important here due to intrusive probes, do *not* alphabetize # this list of network interfaces until the probes have been fixed. # Right now it appears that the ie0 must be probed before ep0. See # revision 1.20 of this file. device ed0 at isa? port 0x280 net irq 10 iomem 0xd8000 #device ie0 at isa? port 0x300 net irq 10 iomem 0xd0000 #device ep0 at isa? port 0x300 net irq 10 #device ex0 at isa? port? net irq? #device fe0 at isa? port 0x300 net irq ? #device le0 at isa? port 0x300 net irq 5 iomem 0xd0000 #device lnc0 at isa? port 0x280 net irq 10 drq 0 #device xe0 at isa? port? net irq ? #device ze0 at isa? port 0x300 net irq 10 iomem 0xd8000 #device zp0 at isa? port 0x300 net irq 10 iomem 0xd8000 #device cs0 at isa? port 0x300 net irq ? pseudo-device loop pseudo-device ether #pseudo-device sl 1 pseudo-device ppp 1 pseudo-device tun 1 pseudo-device pty 16 pseudo-device gzip # Exec gzipped a.out's # KTRACE enables the system-call tracing facility ktrace(2). # This adds 4 KB bloat to your kernel, and slightly increases # the costs of each syscall. options KTRACE #kernel tracing # This provides support for System V shared memory and message queues. # options SYSVSHM options SYSVMSG options SYSVSEM # The `bpfilter' pseudo-device enables the Berkeley Packet Filter. Be # aware of the legal and administrative consequences of enabling this # option. The number of devices determines the maximum number of # simultaneous BPF clients programs runnable. #pseudo-device bpfilter 4 #Berkeley packet filter controller snd0 device sb0 at isa? port 0x220 irq 5 drq 1 device sbxvi0 at isa? drq 5 device sbmidi0 at isa? port 0x330 device awe0 at isa? port 0x620 device opl0 at isa? port 0x388 device mpu0 at isa? port 0x330 irq 6 drq 0 device uart0 at isa? port 0x330 irq 5 device awe0 at isa? port 0x620 conflicts # for Wine options USER_LDT # # Allow processes to switch to vm86 mode, as well as enabling direct # user-mode access to the I/O port space. This option is necessary for # the doscmd emulator to run and the VESA modes in syscons to be available. # options "VM86" >Release-Note: >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the messagehome | help
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