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Full Discussion: what is suid ?
Top Forums UNIX for Dummies Questions & Answers what is suid ? Post 24439 by PxT on Thursday 11th of July 2002 01:11:03 PM
Old 07-11-2002
SUID stands for "Set User-ID". If the suid bit is enable on an executable, then whenever that program is run the process will take on the privilege of whoever the file owner is. For example if I have a suid binary which is owned by "root" and I execute it as my normal (non-root) user name, it will execute with all the permissions of root. There is also SGID which is Set Group-ID -- similar concept. Obviously this can be very dangerous, so it is recommended that you set an executable to suid only if you are absolutely certain that it is safe to do so.
 

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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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