Messages in this thread | | | Date | Mon, 22 Jan 2001 23:23:36 -0600 (CST) | From | Thomas Molina <> | Subject | problem with dd for floppy under 2.4.0 |
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[1.] One line summary of the problem: seek= parameter for dd under 2.4.0 gives permission denied error [2.] Full description of the problem/report:I was creating a new root+boot disk for 2.4.0 this evening. I issued the command: dd if=/tmp/rootfs.gz of=/dev/fd0 bs=1k seek=335
and got the error message: dd: /dev/fd0: Permission denied
Under 2.2.18 the copy succeeds. Under 2.4.0, specifying a non-zero seek paramter results in an error.
[3.] Keywords (i.e., modules, networking, kernel): floppy, dd, copy
[4.] Kernel version (from /proc/version): Linux version 2.4.0 (tmolina@wr5z) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 Sat Jan 20 15:20:46 CST 2001
[5.] Output of Oops.. message (if applicable) N/A
[6.] A small shell script or example program which triggers the problem (if possible) See 2. above
[7.] Environment
[7.1.] Software (add the output of the ver_linux script here) -- Versions installed: (if some fields are empty or look -- unusual then possibly you have very old versions) Linux wr5z 2.4.0 #1 Sat Jan 20 15:20:46 CST 2001 i586 unknown Kernel modules 2.4.1 Gnu C egcs-2.91.66 Gnu Make 3.78.1 Binutils 2.9.5.0.22 Linux C Library 2.1.3 Dynamic linker ldd (GNU libc) 2.1.3 Procps 2.0.6 Mount 2.10f Net-tools 1.54 Console-tools 0.3.3 Sh-utils 2.0 Modules Loaded opl3
[root@wr5z linux]# dd --version dd (GNU fileutils) 4.0p
[7.2.] Processor information (from /proc/cpuinfo): [root@wr5z linux]# cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 5 model : 8 model name : AMD-K6(tm) 3D processor stepping : 12 cpu MHz : 451.031 cache size : 64 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 1 wp : yes flags : fpu vme de pse tsc msr mce cx8 pge mmx syscall 3dnow k6_mtrr bogomips : 897.84
[7.3.] Module information (from /proc/modules): opl3 11904 0 (unused)
[7.4.] Loaded driver and hardware information (/proc/ioports, /proc/iomem) [root@wr5z linux]# cat /proc/ioports 0000-001f : dma1 0020-003f : pic1 0040-005f : timer 0060-006f : keyboard 0080-008f : dma page reg 00a0-00bf : pic2 00c0-00df : dma2 00f0-00ff : fpu 0170-0177 : ide1 01f0-01f7 : ide0 02f8-02ff : serial(auto) 0376-0376 : ide1 0388-038b : Yamaha OPL3 03bc-03be : parport0 03c0-03df : vesafb 03f6-03f6 : ide0 03f8-03ff : serial(auto) 0cf8-0cff : PCI conf1 5000-50ff : VIA Technologies, Inc. VT82C586B ACPI d000-dfff : PCI Bus #01 d000-d0ff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X e000-e00f : VIA Technologies, Inc. Bus Master IDE e000-e007 : ide0 e008-e00f : ide1 e800-e87f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3] e800-e87f : eth0 ec00-ec3f : 3Com Corporation 3c900 10BaseT [Boomerang] ec00-ec3f : eth1
[root@wr5z linux]# cat /proc/iomem 00000000-0009fbff : System RAM 0009fc00-0009ffff : reserved 000a0000-000bffff : Video RAM area 000c0000-000c7fff : Video ROM 000f0000-000fffff : System ROM 00100000-03ffffff : System RAM 00100000-0021f62b : Kernel code 0021f62c-002939c7 : Kernel data e0000000-e3ffffff : VIA Technologies, Inc. VT82C597 [Apollo VP3] e4000000-e7ffffff : PCI Bus #01 e4000000-e4ffffff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X e4000000-e47fffff : vesafb e6000000-e6000fff : ATI Technologies Inc 3D Rage Pro AGP 1X/2X ea000000-ea00007f : Digital Equipment Corporation DECchip 21041 [Tulip Pass 3] ea000000-ea00007f : eth0 ffff0000-ffffffff : reserved
[7.5.] PCI information ('lspci -vvv' as root) N/A
[7.6.] SCSI information (from /proc/scsi/scsi) N/A
[7.7.] Other information that might be relevant to the problem (please look in /proc and include all information that you think to be relevant):
Under 2.2.18 I get the following extract from strace:
open("/tmp/rootfs.gz", O_RDONLY|O_LARGEFILE) = 0 close(1) = 0 open("/dev/fd0", O_RDWR|O_CREAT|O_LARGEFILE, 0666) = 1 ftruncate64(0x1, 0x53c00, 0, 0, 0x1) = -1 ENOSYS (Function not implemented) ftruncate(1, 343040) = 0 rt_sigaction(SIGINT, NULL, {SIG_DFL}, 8) = 0
Under 2.4.0 I get the following extract from strace:
open("/tmp/rootfs.gz", O_RDONLY|O_LARGEFILE) = 0 close(1) = 0 open("/dev/fd0", O_RDWR|O_CREAT|O_LARGEFILE, 0666) = 1 ftruncate64(0x1, 0x53c00, 0, 0, 0x1) = -1 EACCES (Permission denied) write(2, "dd: ", 4) = 4 write(2, "/dev/fd0", 8) = 8 write(2, ": Permission denied", 19) = 19 write(2, "\n", 1) = 1 _exit(1) = ?
Under 2.4.0 I get the following from strace if I don't include the seek= paramter for the copy:
open("/tmp/rootfs.gz", O_RDONLY|O_LARGEFILE) = 0 close(1) = 0 open("/dev/fd0", O_WRONLY|O_CREAT|O_TRUNC|O_LARGEFILE, 0666) = 1 rt_sigaction(SIGINT, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGINT, {0x80493a0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGQUIT, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGQUIT, {0x80493a0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGPIPE, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGPIPE, {0x80493a0, [], 0x4000000}, NULL, 8) = 0 rt_sigaction(SIGUSR1, NULL, {SIG_DFL}, 8) = 0 rt_sigaction(SIGUSR1, {0x8049400, [], 0x4000000}, NULL, 8) = 0
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