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RE: How can i call a function which is usually used by root?





--- On Tue, 12/2/08, Fred Silsbee <fredsilsbee yahoo com> wrote:

> From: Fred Silsbee <fredsilsbee yahoo com>
> Subject: RE: How can i call  a function which is usually used by root?
> To: "Community assistance, encouragement, and advice for using Fedora." <fedora-list redhat com>
> Date: Tuesday, December 2, 2008, 5:42 PM
> --- On Tue, 12/2/08, bruce <bedouglas earthlink net>
> wrote:
> 
> > From: bruce <bedouglas earthlink net>
> > Subject: RE: How can i call  a function which is
> usually used by root?
> > To: "'Community assistance, encouragement,
> and advice for using Fedora.'"
> <fedora-list redhat com>
> > Date: Tuesday, December 2, 2008, 4:04 PM
> > hi...
> > 
> > check out how to handle/setup a superuser group (sudo)
> > which allows a normal
> > user to assume the role/privs of the root/superuser
> for a
> > specifically
> > defined task.
> > 
> > should handle your issue, if i understand what
> you're
> > attempting. there
> > should be examples on the 'net as well..
> > 
> > 
> > -----Original Message-----
> > From: fedora-list-bounces redhat com
> > [mailto:fedora-list-bounces redhat com]On Behalf Of wk
> > Sent: Tuesday, December 02, 2008 1:21 AM
> > To: fedora-list
> > Subject: How can i call a function which is usually
> used by
> > root?
> > 
> > 
> > I want write a c program.And a common user(not in root
> > group) will run this
> > program.
> > In this program,I call fread(/dev/sdc...) and
> > fwrite(/dev/sdc),but this call
> > will return "permission no allow".If I use
> the
> > root user,will be ok.
> > How to change to the authority to root's?
> > 
> > I know the  root's password.
> > 
> > -- 
> > fedora-list mailing list
> > fedora-list redhat com
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> > Guidelines:
> >
> http://fedoraproject.org/wiki/Communicate/MailingListGuidelines
> 
 
 study the following... s bit is what you want:
 
 consider the function passwd...allows the user to alter a
 file owned by root
bash>ls -alF /usr/bin/passwd
-rwsr-xr-x 1 root root 25740 2008-04-08 08:48 /usr/bin/passwd*

notice the "s"

 
  How does one set the sticky bit and set UID bits with
 chmod?
 
            octal digit>      1            2           3 
          4 
      octal value 
 
             4             set UID         r           r    
       r 
 
             2             set GID         w           w    
       w 
 
             1             sticky bit      x           x    
       x 
 
 
 
 r   read 
 w   write 
 x   execute 
 s   set UID or set GID 
 t   set sticky bit 
 
 chmod u+st  filename 
 chmod -R does down the tree



      


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