11-28-2018
Yes, Linux ignores the suid bit on scripts. You need a binary that has setuid(0); because the suid bit sets the euid only.
(In contrast, setuid scripts do work on most if not all Unix versions.)
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LEARN ABOUT CENTOS
getresgid
GETRESUID(2) Linux Programmer's Manual GETRESUID(2)
NAME
getresuid, getresgid - get real, effective and saved user/group IDs
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <unistd.h>
int getresuid(uid_t *ruid, uid_t *euid, uid_t *suid);
int getresgid(gid_t *rgid, gid_t *egid, gid_t *sgid);
DESCRIPTION
getresuid() returns the real UID, the effective UID, and the saved set-user-ID of the calling process, in the arguments ruid, euid, and
suid, respectively. getresgid() performs the analogous task for the process's group IDs.
RETURN VALUE
On success, zero is returned. On error, -1 is returned, and errno is set appropriately.
ERRORS
EFAULT One of the arguments specified an address outside the calling program's address space.
VERSIONS
These system calls appeared on Linux starting with kernel 2.1.44.
The prototypes are given by glibc since version 2.3.2, provided _GNU_SOURCE is defined.
CONFORMING TO
These calls are nonstandard; they also appear on HP-UX and some of the BSDs.
NOTES
The original Linux getresuid() and getresgid() system calls supported only 16-bit user and group IDs. Subsequently, Linux 2.4 added getre-
suid32() and getresgid32(), supporting 32-bit IDs. The glibc getresuid() and getresgid() wrapper functions transparently deal with the
variations across kernel versions.
SEE ALSO
getuid(2), setresuid(2), setreuid(2), setuid(2), credentials(7)
COLOPHON
This page is part of release 3.53 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 2010-11-22 GETRESUID(2)