Please explain setuid bit clearly! Post: 302601896

8 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

setuid sticky bit

I have a binary. It is having the following permissions rws rws rwx mqm:mqm runmqtrm The same program on another machine is rws rws rwx root: mqm runmqtrm This program is a setuid program. This is what my understanding is. Whatever user the program is started under, it will finally be...

2. Programming

copying or concatinating string from 1st bit, leaving 0th bit

Hello, If i have 2 strings str1 and str2, i would like to copy/concatenate str2 to str1, from 1st bit leaving the 0th bit. How do i do it?

3. Programming

setuid bit on user + dynamically linked libraries

hi all, i have a critical and specific problem with respect to set uid bit on user and the dll's for a binary, (under the userid A) it needs libraries from /usr/lib and informix libraries from $INFORMIXDIR/lib/esql but this binary should be kicked off from id B, hence s-bit on user is...

4. HP-UX

setuid bit - error

hi i have written small script which will login 2 two different users with su but if we run from normal user it prompts for password so i chnaged the owner of script to root and added setuid bit with chmod u+s <script_name> but when i run the script i get following message Warning:...

5. Red Hat

process fails if setuid bit is set

Hi, OS : Linux I have an executable (P1) owned by user say "abcd" and the setuid bit is set. And there is another executable (P2) which brings up the process (P1). When the setuid bit is set, the process P1 is failing, if the setuid bit is not set there is no issue. I was wondering if...

6. UNIX for Dummies Questions & Answers

setuid & sticky bit

Can anyone explain me difference between setuid and sticky bit? and also between setuid and chown?

7. Shell Programming and Scripting

How to handle 64 bit arithmetic operation at 32 bit compiled perl interpreter?H

Hi, Here is the issue. From the program snippet I have Base: 0x1800000000, Size: 0x3FFE7FFFFFFFF which are of 40 and 56 bits. SO I used use bignum to do the math but summing them up I always failed having correct result. perl interpreter info, perl, v5.8.8 built for...

8. UNIX for Beginners Questions & Answers

What keeps me from abusing setuid(0) and programs with setuid bit set?

Just learning about the privilege escalation method provided by setuid. Correct me if I am wrong but what it does is change the uid of the current process to whatever uid I set. Right ? So what stops me from writing my own C program and calling setuid(0) within it and gaining root privileges ? ...

LEARN ABOUT DEBIAN

ctrlaltdel

CTRLALTDEL(8)						       System Administration						     CTRLALTDEL(8)

NAME

       ctrlaltdel - set the function of the Ctrl-Alt-Del combination

SYNOPSIS

       ctrlaltdel hard|soft

DESCRIPTION

       Based  on examination of the linux/kernel/sys.c code, it is clear that there are two supported functions that the Ctrl-Alt-Del sequence can
       perform: a hard reset, which immediately reboots the computer without calling sync(2) and without any other preparation; and a soft  reset,
       which sends the SIGINT (interrupt) signal to the init process (this is always the process with PID 1).  If this option is used, the init(8)
       program must support this feature.  Since there are now several init(8) programs in the Linux community, please consult	the  documentation
       for the version that you are currently using.

       ctrlaltdel is usually used in the /etc/rc.local file.

FILES

       /etc/rc.local

SEE ALSO

       simpleinit(8), init(8)

AUTHOR

       Peter Orbaek (poe@daimi.aau.dk)

AVAILABILITY

       The ctrlaltdel command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

util-linux							   October 1993 						     CTRLALTDEL(8)