[Mageia-discuss] Need help recovering execute permission on local files

Len Lawrence tarazed25 at gmail.com
Mon Jun 11 16:28:32 CEST 2012

On 11/06/12 13:58, Alejandro López wrote:
> On Mon, Jun 11, 2012 at 2:30 PM, Len Lawrence <tarazed25 at gmail.com 
> <mailto:tarazed25 at gmail.com>> wrote:
>     On 11/06/12 12:28, Doug Laidlaw wrote:
>         On Mon, 11 Jun 2012 11:33:46 +0100
>         Len Lawrence<tarazed25 at gmail.com <mailto:tarazed25 at gmail.com>>
>          wrote:
>             After a warm reboot this morning I found that I no longer
>             had the
>             ability to run my own commands even though the permissions
>             are correct
>             and ownership is lcl (uid=500).  User system commands are
>             OK so
>             running a script via ruby for instance works but trying to
>             execute the
>             script by itself fails even though it is fully executable.
>              This
>             applies to all my local bin commands.  Command aliases
>             however do work
>             as long as they do not involve running any of my bin files.
>             Even root cannot execute these bin commands; same message
>             "Permission
>             denied".
>             In addition the system has switched me to autologin.
>              Trying to run
>             mcc I was told it cannot be run in console mode (??).  If
>             I login as
>             su mcc comes up in console mode, which I am not inclined
>             to use.
>             The hostname on this machine is belexeuli; this does not
>             appear in
>             the command prompt: [lcl at localhost ~]$
>             After su: [root at belexeuli lcl]#
>             This may all have something to do with my adding groups
>             and changing
>             group ids yesterday in my attempts to implement a viable
>             sudoers
>             command.  It worked and I could log out and in again
>             without any
>             problems.  I even managed a reboot without trouble but
>             today is
>             another story.
>             I suspect that solving these multiple problems is beyond
>             my technical
>             skill even with help so a full reinstall is probably the
>             best bet.
>             However I will await any comments.
>             Len
>         You say that the permissions are correct, but do they include
>         execute
>         permissions?  The prompt difference may be simply that root's
>         prompt is
>         no longer the same as a user's prompt.  It is set by a config
>         file for
>         each user.  You can see the code for it by typing "echo $PS1"
>         In my
>         case, that gives "[\u@\h \W]\$"  The \h puts in the hostname.
>          You can
>         change it for the current session by typing at the user prompt:
>             PS1="[\u@\h \W]\$"
>         You can make that permanent by putting it in your
>         .bash_profile, where
>         it should override the other at your next login, but really,
>         it is only
>         a workaround.
>         With so many issues, I would do a full reinstall, but more
>         knowledgeable
>         people tell me it is the easy way out.
>         HTH,
>         Doug.
>     Yes, all the commands have execute permission.  I have been using
>     my local bin directory for years and I have never had execute
>     refused so this must reflect some deep system level screwup
>     relating to lcl and maybe something in pam.d.  That is unknown
>     country for me.
>     Until yesterday there was no lcl group, only user lcl.  The group
>     for lcl was live, which I have
>     removed from my group list.  live was my primary group, now it is
>     lcl which I added yesterday.  Ownership of my files is now lcl:lcl
>     and in /home/lcl/bin the permissions are nearly all 755.
>     Note that I can chmod -x <file> and chmod +x <file> but that does
>     not change anything.
>     I notice that home now contains a "live" directory: /home/live,
>     ownership lcl:lcl, containing tmp and nothing else.  Now that is
>     weird.
>     The difference in the root and user prompts is probably related to
>     the fact that root cannot access the user's X display.  I have
>     seen that sort of thing before when the two have been using
>     different hostnames.  I think that root is now looking at
>     belexeuli:0 whereas the user has for some reason reverted to
>     localhost:0.  Attempts at using the gui by root throw up protocol
>     errors.
>     As you say, a reinstall looks like the best way out.  More
>     knowledgeable people would probably know just where to look for
>     the root of the problem(s) but even after 21 years experience of
>     Unix and Linux I know next to nothing about access and security
>     policies.
> Maybe it was somehow mounted with the -noexec flag?
> Alejandro.
mtab contains this entry:

/dev/sda6 /home ext4 
rw,nosuid,nodev,noexec,relatime,user_xattr,barrier=1,data=ordered 0 0

fstab had:
# Entry for /dev/sda6 :
UUID=341956e4-fddb-45a6-a191-4c912328ec7a /home ext4 user,defaults 1 2
none /proc proc defaults 0 0

I have removed the "user," because it does not tally with my other mga2 
That does not have noexec against /home.

About to reboot.

Thanks for the pointer.

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