Bug 91567

Summary: setegid sets saved gid
Product: [Retired] Red Hat Linux Reporter: Steve Grubb <linux_4ever>
Component: glibcAssignee: Jakub Jelinek <jakub>
Status: CLOSED RAWHIDE QA Contact: Brian Brock <bbrock>
Severity: medium Docs Contact:
Priority: medium    
Version: 9CC: fweimer, mitr
Target Milestone: ---   
Target Release: ---   
Hardware: i586   
OS: Linux   
Fixed In Version: 2.3.2-49 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2003-06-17 21:35:14 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Description Steve Grubb 2003-05-24 15:22:37 UTC
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.2.1) Gecko/20030225

Description of problem:
The setegid call sets the saved gid even though it should not. SUS says only
effective gid should be set. I looked at glibc source and it is calling
__setresgid(-1, euid,-1);

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Compile and run the following program:

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
int main(void)
    struct passwd nobody;
    gid_t cur_rgid, cur_egid, cur_sgid;
    gid_t orig_rgid, orig_egid, orig_sgid;
    if (geteuid() != 0) {
        puts("Must be super/root for this test!");
        return 1;
    nobody = *getpwnam("nobody");
    getresgid(&orig_rgid, &orig_egid, &orig_sgid);
    printf("getresgid reports rgid %d, egid %d, sgid %d\n", orig_rgid,
           orig_egid, orig_sgid);
    getresgid(&cur_rgid, &cur_egid, &cur_sgid);
    printf("getresgid reports rgid %d, egid %d, sgid %d\n", cur_rgid,
           cur_egid, cur_sgid);
    if (orig_sgid != cur_sgid) {
        puts("setegid() changed the saved set-gid");
        return 1;
    return 0;

Actual Results:  getresgid reports rgid 0, egid 0, sgid 0
getresgid reports rgid 0, egid 99, sgid 99
setegid() changed the saved set-gid

Expected Results:  getresgid reports rgid 0, egid 0, sgid 0
getresgid reports rgid 0, egid 99, sgid 0

Additional info:

Comment 1 Ulrich Drepper 2003-11-04 21:47:06 UTC
Try the RHL9 errata.  Test code at