07-06-2011
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
well, I'm completely stumped so I'm hopeful that someone here may have an answer...one of my development machines is running Solaris 8 and I've been trying to create a folder in /apps. it gives me this message:
mkdir: Failed to make directory "*******"; Operation not applicable
I've tried... (2 Replies)
Discussion started by: jkrotz
2 Replies
2. UNIX for Advanced & Expert Users
Hi all,
I am using Sun Solaris 9 .In this system normal users unable to create files from the command line.I added these users in bin,adm and even root group i found them unable to create a file. (1 Reply)
Discussion started by: mallesh
1 Replies
3. UNIX for Advanced & Expert Users
Version-Release number of selected component (if applicable):
==================================================================
root@server # cat /etc/redhat-release
Red Hat Enterprise Linux ES release 4 (Nahant Update 5)
root@server # uname -a
Linux server.integrityserver.net... (16 Replies)
Discussion started by: fed.linuxgossip
16 Replies
4. Shell Programming and Scripting
Hi All,
I have directory under /opt/test.
The ownership of the test directory is root:root.
I have login to the server as test user.
I need to have some script to create a directory inside /opt/test.
This script will be called as test user.
When I try to execute... (4 Replies)
Discussion started by: kalpeer
4 Replies
5. Homework & Coursework Questions
first off let me introduce myself. My name is Eric and I am new to linux, I am taking an advanced linux administration class and we are tasked with creating a script to add new users that anyone can run, has to check for the existence of a directory. if the directory does not exist then it has... (12 Replies)
Discussion started by: pbhound
12 Replies
6. UNIX for Dummies Questions & Answers
I've tried to figure this out.
I'm only about 6 mos into my AIX admin duties, but I've got a "security" problem I can't figure out.
I've created a sub directory as follows:
drwx------ 2 root system 256 Apr 13 16:02 mike
I've logged in another session with the following user:
$ id... (2 Replies)
Discussion started by: mpheine
2 Replies
7. Solaris
Hi,
I am new to Solaris and when i am trying to Switch to root login from user, system throws message saying permissions denied...
Steps I Followed:
Created a user and logged into that user by SU username
tried to come back to root but system throws message "permissions denied"
... (7 Replies)
Discussion started by: VijaySolaris
7 Replies
8. UNIX for Advanced & Expert Users
Hi!! one strange problem occurred with my RHEL 5 box.
i'm having logs folder with ownership of non-root user. Created some files with root user under logs folder.
here is the scene:
-rw-r----- 1 root root 1048227 Feb 28 12:34 SystemOut_13.02.28_12.34.10.log
-rw-r----- 1 root root ... (6 Replies)
Discussion started by: sukhdip
6 Replies
9. UNIX for Dummies Questions & Answers
Is there any way to create a file in linux that root user also can't delete? (8 Replies)
Discussion started by: palani13dec
8 Replies
10. UNIX for Dummies Questions & Answers
Hi,
I tired changing password for mqm user in linux server with root user.
But still I couldn't able to login mqm user with changed password.
Can anyone please help on this.
# passwd mqm
Thanks,
Anusha (4 Replies)
Discussion started by: Anusha M
4 Replies
LEARN ABOUT LINUX
setuid32
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 3.27 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)