Gid=0 and 7 + admin=FALSE

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LEARN ABOUT REDHAT

setfsgid

SETFSGID(2)						     Linux Programmer's Manual						       SETFSGID(2)

NAME

       setfsgid - set group identity used for file system checks

SYNOPSIS

       #include <unistd.h> /* glibc uses <sys/fsuid.h> */

       int setfsgid(uid_t fsgid);

DESCRIPTION

       The  system call setfsgid sets the group ID that the Linux kernel uses to check for all accesses to the file system. Normally, the value of
       fsgid will shadow the value of the effective group ID. In fact, whenever the effective group ID is changed, fsgid will also be  changed	to
       the new value of the effective group ID.

       Explicit  calls	to  setfsuid and setfsgid are usually only used by programs such as the Linux NFS server that need to change what user and
       group ID is used for file access without a corresponding change in the real and effective user and group IDs.  A change in the normal  user
       IDs for a program such as the NFS server is a security hole that can expose it to unwanted signals. (But see below.)

       setfsgid  will  only  succeed  if  the caller is the superuser or if fsgid matches either the real group ID, effective group ID, saved set-
       group-ID, or the current value of fsgid.

RETURN VALUE

       On success, the previous value of fsgid is returned.  On error, the current value of fsgid is returned.

CONFORMING TO

       setfsgid is Linux specific and should not be used in programs intended to be portable.  It is present since Linux 1.1.44 and in libc  since
       libc 4.7.6.

BUGS

       No error messages of any kind are returned to the caller. At the very least, EPERM should be returned when the call fails.

NOTES

       When glibc determines that the argument is not a valid gid, it will return -1 and set errno to EINVAL without attempting the system call.

       Note  that  at the time this system call was introduced, a process could send a signal to a process with the same effective user ID.  Today
       signal permission handling is slightly different.

SEE ALSO

       kill(2), setfsuid(2)

Linux 1.3.15							    2002-07-23							       SETFSGID(2)

AIX