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Cannot Run Seteuid

GDM initialises and the login screen appears. - I can log in as root and Gnome executes and loads. - When I attempt to use GDM and login as user, it Have you ever used Unix before? A signal can be set if: Sending Process's...matches Recieving Process's... The Linux man page says applications like NFS servers set the filesystem UID to a different value than the effective UID so they can read/write files as a user, without that

Some other interesting cases come up if we start as root. Not the answer you're looking for? In 2001 POSIX brought it back. Setuid() changes all three UIDs, but works for non-root users only if the new UID matches the real UID. view publisher site

Last edited by Oko; 22nd May 2011 at 01:52 PM. With bash, you're left with executing a setuid executable each time you want to change uid. Developer does not see priority in git Development Workflow being followed Why are LEDs in my home unaffected by voltage drop? But as it evolved to something that works to some extent and involves a few nice hacks, here is a little explanation: As Miroslav said, if we leave aside the Linux-style

It is saved so that that UID can be taken back after it is given up. Moreover once you drop privileges, there's no way back. I guess it is... >> >> Karl >> >> >> -- >> >> Karl F. It sets the effective UID only, and can only set to the effective, saved or real UID.

The time now is 12:26 PM. -- DaemonForums Fixed Width 60em -- DaemonForums Fixed Width 80% -- DaemonForums Fluid Width - Contact Us - DaemonForums.org - Archive - Privacy Statement - We permit the log file so only logger can write to it, and we make the program so it runs set-uid-logger. Hours of google searching hasn't helped much, but here is a link to a page that describes a problem as similar to mine as I could find: http://forum.tinycorelinux.net/index.php?topic=195.0It mentions this: BTW, https://ubuntuforums.org/showthread.php?t=946033 Browse other questions tagged bash sudo su or ask your own question.

If an image is rotated losslessly, why does the file size change? How to give Permission to create sandbox? Two users exist in my Linux system. You'll notice that the first part up to set +x is wrapped in a command group whose stderr is redirected to /dev/null ({...} 2> /dev/null).

In AIX, setreuid(a,b) (where a!=b) is equivalent to seteuid(b) and setreuid(b,b) is equivalent to setuid(b). http://stackoverflow.com/questions/9300804/popen-fails-when-called-after-seteuid0 If an image is rotated losslessly, why does the file size change? Systems without saved UIDs are pretty much extinct. (NextStep was the last one I saw). Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Official Flavours Support New to Ubuntu [ubuntu] Xsession failure Having an

Password FAQ Today's Posts Search OpenBSD Packages and Ports Installation and upgrading of packages and ports on OpenBSD. It also sets the egid, rgid and ssgid and supplementary groups based on the group memberships as defined in the user database. Oko View Public Profile Find all posts by Oko #3 (View Single Post) 22nd May 2011 Oko Banned Join Date: May 2008 Location: Kosovo, Serbia Posts: 1,088 For non-root processes the sending process's UIDs must match up with the receiving process's uid, but if the manual pages can be trusted, the exact rules vary.

I couldnt log into my window manager (enlightenment) as a non-root user. Early Saved-UID Functions In 4.4BSD the saved-UID appeared and these four functions were modified. geteuid() Return the processes effective UID. setreuid(ruid,euid) For a while this was officially depreciated, like setruid(), but it never quite went away and has now belatedly made it into the standards.

That is like using sudo or su. Using the seteuid() they could temporarily surrender them, or take them back. Many distibutions of Linux, for example, have checks in shell invocation to prevent a script begin run setuid or seteuid.

However it seems that my program is not working.

Can clients learn their time zone on a network configured using RA? So does zsh: $ sudo zsh -c 'EUID=1; id -u; EUID=0; EUID=2; id -u' 1 2 Though above those id commands are called with a real user id and saved set In Linux /bin/sh is normally bash. That is because you do not have anything in .xsession file.

The idea was presumably that non-privileged processes should never be changing their real UID. How to install Mediawiki in Ubuntu If I receive written permission to use content from a paper without citing, is it plagiarism? Each message would have a header identifying the user. Jan Wolter (E-Mail) Sun Sep 22 20:24:22 EDT 2002 - Original Release.

Karl -- Karl F. Saved UID complicates things, but I don't believe it affects the one-way trap of EUID 0 doing setuid().