Bug 91567 - setegid sets saved gid
Summary: setegid sets saved gid
Alias: None
Product: Red Hat Linux
Classification: Retired
Component: glibc
Version: 9
Hardware: i586
OS: Linux
Target Milestone: ---
Assignee: Jakub Jelinek
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2003-05-24 15:22 UTC by Steve Grubb
Modified: 2016-11-24 15:06 UTC (History)
2 users (show)

Clone Of:
Last Closed: 2003-06-17 21:35:14 UTC

Attachments (Terms of Use)

External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2003:325 normal SHIPPED_LIVE : Updated glibc packages provide security and bug fixes 2003-11-12 05:00:00 UTC

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


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