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Thread: root has no access to file

  1. #1
    Join Date
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    Windhoek, NAMIBIA
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    Question root has no access to file

    Some files on a customer's Suse box are now not accesible - not even by root. Other files in the same directory are accesssible. It is an long existing box and has been running fine till this morning. There are no prying fingers and nobody but me has root access:

    # ls ADSO33*
    ls: ADSO33.DAT: Permission denied
    ls: ADSO33.KEY: Permission denied

    # sudo ls ADSO33*
    ls: ADSO33.DAT: Permission denied
    ls: ADSO33.KEY: Permission denied

    # chmod 777 ADSO33.DAT
    chmod: failed to get attributes of `ADSO33.DAT': Permission denied

    I am baffled - I have NEVER seen that root cannot access a file.

  2. #2
    Join Date
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    Default Re: root has no access to file

    Not sure, it will help. Just give a shot.
    chmod -R 777 ADSO33.DAT
    Linux[openSUSE, KDE], PHP, MySQL, Wordpress, Tech News, etc :
    http://anl4u.com

  3. #3
    Join Date
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    Default Re: root has no access to file

    Two remarks.

    1) you show a # as prompt in your examples. That means that you are already root. No need to do a sudo.

    2) when doing an ls on a file and getting "permission denied" that means that you have no permission to read the directory that contains the file, it is not about the file itself. Better information for us would have been to show (as root):
    Code:
    ls -d <the-absolute-path-to-the-dir-involved>
    ls -l <the-absolute-path-to-the-dir-involved>
    ls -l <the-absolute-path-to-the-dir-involved>/<one-of-the-files-involved>
    and then cut/paste that completely in your post (preferable within CODE tags).
    Henk van Velden

  4. #4
    natural_pilot NNTP User

    Default Re: root has no access to file

    > I am baffled - I have NEVER seen that root cannot access a file.

    hmmmm...that ADSO33.DAT looks suspiciously like the convention used by
    another popular operating system...

    so: the file system in use by the partition in which ADSO33.DAT lives
    is what?

    that partition is mounted read/write? right? a local (to the user)
    partition, or on the net and shared?

    or, is this *.DAT in the customer's /home on a Linux formatted partition?

    has it been fsck'ed in living memory? are there errors found now, if
    checked? after checking, is there anything i /home/lost+found ?

    the permissions of the directory the file is in is what?

    has s/he accessed that directory while logged into KDE/Gnome/other
    Linux GUI as root?

    if *DAT is inside /home on a linux formatted partition--from inside
    user's /home, do this and copy/paste to here:

    ls -hal .ICE*

    --
    .~.
    /V\
    /( )\
    natural^^-^^pilot

  5. #5
    Join Date
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    Default Re: root has no access to file

    Henk,
    I take ir you actually meant "ls -ld...". etc.

    # ls -ld /usr/assist
    drwxrwxrwx 17 root users 84216 Jun 27 14:18 /usr/assist

    ls -l /usr/assist is a bit much as there are 2000+ files in the directory.

    # ls -l /usr/assist/ADSO33.DAT
    ls: /usr/assist/ADSO33.DAT: Permission denied

    natural_pilot,

    hmmmm...that ADSO33.DAT looks suspiciously like the convention used by
    another popular operating system...
    so: the file system in use by the partition in which ADSO33.DAT lives
    is what?


    The file is a cobol data file and is accompanied by a ADSO33.KEY index. There are close to a thousand of them in this directory, most accessible, but all of a sudden a certain number not. It is a textbased POS system and is running for ten plus years.

    that partition is mounted read/write? right? a local (to the user)
    partition, or on the net and shared?


    The file is in the root filesystem.

    or, is this *.DAT in the customer's /home on a Linux formatted partition?

    The filesystem is reiserfs

    has it been fsck'ed in living memory? are there errors found now, if
    checked? after checking, is there anything i /home/lost+found ?


    Since it is in the root I will gave to bring the system down and check - will come back to you on that one.

    the permissions of the directory the file is in is what?

    777 for now - I have tried a few things and will tighten up again after we fixed this problem.

    has s/he accessed that directory while logged into KDE/Gnome/other
    Linux GUI as root?


    It is a textbased POS system that is accessed via ssh / telnet sessions.

    if *DAT is inside /home on a linux formatted partition--from inside
    user's /home, do this and copy/paste to here:

    ls -hal .ICE*


    The files reside in /usr/assist and there are no ICE* files in the directory.

    Guys THANK YOU for taking the time out to help me - it is appreciated ver much.

  6. #6
    natural_pilot NNTP User

    Default Re: root has no access to file

    > It is a textbased POS system and is running for ten plus years.

    hmmmmmm...

    first, since i don't know what a "textbased POS" is i'm probably not
    qualified to give you any answers..

    second, if it has been running 10+ years i now wonder just what
    version of SuSE or SUSE or openSUSE or SLES it is running....and, if
    it is being updated and having security patches applied..


    > The filesystem is reiserfs


    there was (within the last six months or so) a kernel update to fix a
    problem with reiserfs...i think i'd start by researched that..

    and, i guess you are aware that reiserfs has fallen out of favor with
    openSUSE (and, i guess Novell, but i'm not certain)...well, i mean
    reiserfs was the default install about three (or five?) years
    ago...now the default is ext3, again..

    and, if the box happens to be running SLES (SUSE Linux Enterprise
    Server) i think i'd seek a more competent authority on that over in
    the Novell forum:
    http://forums.novell.com/novell-prod...e-server-sles/


    >> has it been fsck'ed ...

    > Since it is in the root I will gave to bring the system down and check
    > - will come back to you on that one.


    might be good to do that along with the kernel upgrade's reboot needs..

    hmmmmmmmmmm...i just had another thought: individual file permissions
    are just another bit of data saved on the disk somewhere...if the
    drive is gettin' flakey it could as easily 'forget' the permission of
    a file as it could corrupt data--therefore, i think i'd do good backup
    and check the health of that/those drives...(and, if forced to replace
    them i'd seriously consider changing the file system--i understand
    that reiserfs progress has been lagging since Mr. Reiser went to prison)

    CAVEAT: i'm not a real guru...i'm not qualified to give advice...if
    you do as i muse here, and your machine catches on fire and your house
    burns down, do NOT come crying to me for what you did to your
    system...always seek competent authority.

    --
    .~.
    /V\
    /( )\
    natural^^-^^pilot

  7. #7
    Join Date
    Jun 2008
    Location
    Netherlands
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    24,871

    Default Re: root has no access to file

    I have thought this over during dinner (and a bit after), but fail to see the light.

    IMHO an ls needs only access to the directory, so I fail to see how the meesage about access to the file can be true (apart from it being done by root, etc.)

    I suppose that cp the file to another directory is as fruitless (no doubt you tried this already).

    Suggestions of natural_pilot about the reiserfs seem at least something to try (getting the latest updates).

    Do you have a backup (you should have, of course)? What when you retrieve from there (maybe to a ext3 fs)?
    Henk van Velden

  8. #8
    natural_pilot NNTP User

    Default Re: root has no access to file

    > IMHO an ls needs only access to the directory, so I fail to see how the
    > meesage about access to the file can be true (apart from it being done
    > by root, etc.)


    GOOD point!

    --
    .~.
    /V\
    /( )\
    natural^^-^^pilot

  9. #9
    JosephKK NNTP User

    Default Re: root has no access to file

    On Sun, 28 Jun 2009 15:26:01 GMT, stefaug
    <stefaug@no-mx.forums.opensuse.org> wrote:

    >
    >Henk,
    >I take ir you actually meant "ls -ld...". etc.
    >
    ># ls -ld /usr/assist
    >drwxrwxrwx 17 root users 84216 Jun 27 14:18 /usr/assist
    >
    >ls -l /usr/assist is a bit much as there are 2000+ files in the
    >directory.
    >
    ># ls -l /usr/assist/ADSO33.DAT
    >ls: /usr/assist/ADSO33.DAT: Permission denied
    >
    >natural_pilot,
    >
    >hmmmm...that ADSO33.DAT looks suspiciously like the convention used by
    >another popular operating system...
    >so: the file system in use by the partition in which ADSO33.DAT lives
    >is what?
    >
    >The file is a cobol data file and is accompanied by a ADSO33.KEY index.
    >There are close to a thousand of them in this directory, most
    >accessible, but all of a sudden a certain number not. It is a textbased
    >POS system and is running for ten plus years.
    >
    >that partition is mounted read/write? right? a local (to the user)
    >partition, or on the net and shared?
    >
    >The file is in the root filesystem.
    >
    >or, is this *.DAT in the customer's /home on a Linux formatted
    >partition?
    >
    >The filesystem is reiserfs
    >
    >has it been fsck'ed in living memory? are there errors found now, if
    >checked? after checking, is there anything i /home/lost+found ?
    >
    >Since it is in the root I will gave to bring the system down and check
    >- will come back to you on that one.
    >
    >the permissions of the directory the file is in is what?
    >
    >777 for now - I have tried a few things and will tighten up again after
    >we fixed this problem.
    >
    >has s/he accessed that directory while logged into KDE/Gnome/other
    >Linux GUI as root?
    >
    >It is a textbased POS system that is accessed via ssh / telnet
    >sessions.
    >
    >if *DAT is inside /home on a linux formatted partition--from inside
    >user's /home, do this and copy/paste to here:
    >
    >ls -hal .ICE*
    >
    >The files reside in /usr/assist and there are no ICE* files in the
    >directory.
    >
    >Guys THANK YOU for taking the time out to help me - it is appreciated
    >ver much.


    You may find this an off the wall question but there is method to my
    madness:
    Just how many files do you have in the directory where this file
    resides?

  10. #10
    brassy NNTP User

    Default Re: root has no access to file

    > Just how many files do you have in the directory where this file
    > resides?


    answered in earlier post: "There are close to a thousand of them in
    this directory"

    proceed with your madness, please (is there a max number of files in
    any one directory which can be accessed?)

    --
    brassy

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