10 More Discussions You Might Find Interesting
1. Solaris
Hi All
After downloading ZFS documentation from oracle site, I am able to successfully migrate UFS root FS without zones to ZFS root FS. But in case of UFS root file system with zones , I am successfully able to migrate global zone to zfs root file system but zone are still in UFS root file... (2 Replies)
Discussion started by: sb200
2 Replies
2. AIX
I can use sudo su to root from my user id through ssh. Also can change root password. However, I cannnot login by root from ssh.
Does any body know why? (10 Replies)
Discussion started by: rainbow_bean
10 Replies
3. HP-UX
With my SSH, my HP-UX cannot login to root. It will come out a message su: unknown id: root. But I can login by user oracle. I also cannot login to console either by using root or oracle anymore. What shall I do. (5 Replies)
Discussion started by: surizan
5 Replies
4. AIX
Hi, yesterday, I changed root's shell in /etc/passwd, cause a mistake then I can not log in root account (can't find correct shell). I attempted to log in single-mode, however, it prompted for single-mode's password then I type root's password but still can not log in.
I'm using AIX 5L version 5.2... (2 Replies)
Discussion started by: neikel
2 Replies
5. Solaris
I want to enable root login just from one terminal machine, can i do that via /etc/default/login in console=/dev/console line ?
and if so what i have to type exactly, another question is it normal to edit the files inside defaults directly ? or i can copy it to /etc/ and edit it there and its... (3 Replies)
Discussion started by: XP_2600
3 Replies
6. Solaris
Hello all,
I've a problem with root login password in Solaris.
After I installed a patch the root password became empty, so to login as root I don't have to type any password, just username: root.
I've tried the passwd command but it still doesn't work...
Does anyone knows how can I solve this?... (1 Reply)
Discussion started by: pmpx
1 Replies
7. UNIX for Dummies Questions & Answers
All,
I want to run a non-root script as the root user with non-root environment variables with crontab. The non-root user would have environment variables for database access such as Oracle or Sybase. The root user does not have the Oracle or Sybase enviroment variables. I thought you could do... (2 Replies)
Discussion started by: bubba112557
2 Replies
8. AIX
How do I make it so user "root" can not log directly into an AIX server? I want a user to be able to SU to it but not log into it to keep a log (2 Replies)
Discussion started by: breigner
2 Replies
9. Answers to Frequently Asked Questions
We have quite a few threads about this subject. I have collected some of them and arranged them by the OS which is primarily discussed in the thread. That is because the exact procedure depends on the OS involved. What's more, since you often need to interact with the boot process, the... (0 Replies)
Discussion started by: Perderabo
0 Replies
10. IP Networking
Hello Guys,
We are using Sco Unix 5.0
While we was changing root password from scoadmin, It did not change the password and hang in between.
Now, I am unable to login as root user
pls. do suggest me how can i skip root password and how can i goto root to change the password again.
Or if... (4 Replies)
Discussion started by: subho77
4 Replies
SETUID(2) Linux Programmer's Manual SETUID(2)
NAME
setuid - set user identity
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
int setuid(uid_t uid);
DESCRIPTION
setuid() sets the effective user ID of the calling process. If the effective UID of the caller is root, the real UID and saved set-user-ID
are also set.
Under Linux, setuid() is implemented like the POSIX version with the _POSIX_SAVED_IDS feature. This allows a set-user-ID (other than root)
program to drop all of its user privileges, do some un-privileged work, and then reengage the original effective user ID in a secure man-
ner.
If the user is root or the program is set-user-ID-root, special care must be taken. The setuid() function checks the effective user ID of
the caller and if it is the superuser, all process-related user ID's are set to uid. After this has occurred, it is impossible for the
program to regain root privileges.
Thus, a set-user-ID-root program wishing to temporarily drop root privileges, assume the identity of an unprivileged user, and then regain
root privileges afterwards cannot use setuid(). You can accomplish this with seteuid(2).
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EAGAIN The uid does not match the current uid and uid brings process over its RLIMIT_NPROC resource limit.
EPERM The user is not privileged (Linux: does not have the CAP_SETUID capability) and uid does not match the real UID or saved set-user-ID
of the calling process.
CONFORMING TO
SVr4, POSIX.1-2001. Not quite compatible with the 4.4BSD call, which sets all of the real, saved, and effective user IDs.
NOTES
Linux Notes
Linux has the concept of file system user ID, normally equal to the effective user ID. The setuid() call also sets the file system user ID
of the calling process. See setfsuid(2).
If uid is different from the old effective uid, the process will be forbidden from leaving core dumps.
SEE ALSO
getuid(2), seteuid(2), setfsuid(2), setreuid(2), capabilities(7), credentials(7)
COLOPHON
This page is part of release 3.25 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-02-21 SETUID(2)
