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Full Discussion: Difference between inbuilt suid programs and user defined root suid programs under bash shell?
Top Forums UNIX for Dummies Questions & Answers Difference between inbuilt suid programs and user defined root suid programs under bash shell? Post 302955665 by syncmaster on Sunday 20th of September 2015 10:44:21 AM
Old 09-20-2015
Difference between inbuilt suid programs and user defined root suid programs under bash shell?
Hey guys,

Suppose i run passwd via bash shell. It is a suid program, which temporarily runs as root(owner) and modifies the user entries.

However, when i write a C file and give 4755 permission and root ownership to the 'a.out' file , it doesn't run as root in bash shell. I verified this by comparing uid and euid within the program which turned out to be the same. However, in zsh shell, it runs with root privileges

My question is : Why does an inbuilt program like suid is able to run with root privileges in bash shell while a user defined suid root program is not ?
 

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LEARN ABOUT REDHAT

elks

elksemu(1)						      General Commands Manual							elksemu(1)

NAME

       elksemu - Embedded Linux Kernel Subset emulator

SYNOPSIS

       /lib/elksemu program [arguments]

DESCRIPTION

       Elksemu is a program that allows 8086 ELKS programs to be run under Linux-i386. These programs can be compiled using the bcc(1) C compiler.

       It  is not usual to invoke /lib/elksemu directly, either the simple patch or kernel module distributed with it will cause the kernel to run
       /lib/elksemu with the correct arguments whenever the user tries to execute an ELKS executable directly.

OPTIONS

       There are no flag options to elksemu, the first argument is the name of the program to run the rest are arguments that are  passed  to  the
       Elks program.

       The  elksemu  program is normally installed suid-root and in this event it is able to run execute only (chmod 111) elks executables and act
       correctly on the suid permission bits on those executable. This may be considered a  security  hazard  so  elksemu  does  not  have  to	be
       installed suid-root.

SEE ALSO

       bcc(1), as86(1), ld86(1)

BUGS

       Elksemu is incomplete.

       The program may still have security bugs!

								     Jan, 1997								elksemu(1)
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