xorg-x11-server/u_xorg-wrapper-Drop-supplemental-group-IDs.patch

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From: Egbert Eich <eich@suse.de>
Date: Tue Apr 12 15:52:37 2016 +0200
Subject: [PATCH]xorg-wrapper: Drop supplemental group IDs
Patch-mainline: to be upstreamed
References:
Signed-off-by: Egbert Eich <eich@suse.com>
Signed-off-by: Egbert Eich <eich@suse.de>
---
hw/xfree86/xorg-wrapper.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/hw/xfree86/xorg-wrapper.c b/hw/xfree86/xorg-wrapper.c
index d930962..64a43c4 100644
--- a/hw/xfree86/xorg-wrapper.c
+++ b/hw/xfree86/xorg-wrapper.c
@@ -36,6 +36,8 @@
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
#include <sys/consio.h>
#endif
@@ -252,6 +254,52 @@ int main(int argc, char *argv[])
if (needs_root_rights == 0 || (total_cards && kms_cards == total_cards)) {
gid_t realgid = getgid();
uid_t realuid = getuid();
+ int ngroups = 0;
+ gid_t *groups = NULL;
+ long int initlen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ size_t len;
+ struct passwd result, *resultp;
+ char *buffer;
+ int e;
+
+ if (initlen == -1)
+ len = 1024;
+ else
+ len = (size_t) initlen;
+ if ((buffer = malloc(len)) < 0) {
+ fprintf(stderr, "%s: Could not allocate memory: %s\n",
+ progname, strerror(errno));
+ exit (1);
+ }
+ if ((e = getpwuid_r(realuid, &result, buffer, len, &resultp)) > 0) {
+ fprintf(stderr, "%s: Could not get user name: %s\n",
+ progname, strerror(errno));
+ exit (1);
+ } else if (resultp == NULL) {
+ fprintf(stderr, "%s: Could not find user name for UID %d\n",
+ progname, realuid);
+ exit (1);
+ }
+ if (getgrouplist(result.pw_name, realgid, groups, &ngroups) < 0) {
+ if ((groups = malloc(sizeof(gid_t) * ngroups)) == NULL) {
+ fprintf(stderr, "%s: Could not allocate memory: %s\n",
+ progname, strerror(errno));
+ exit (1);
+ }
+ if (getgrouplist(result.pw_name, realgid, groups, &ngroups) < 0) {
+ fprintf(stderr, "%s: Could not get supplementary group list\n",
+ progname);
+ ngroups = 0;
+ }
+ }
+ if (setgroups(ngroups, groups) == -1) {
+ fprintf(stderr, "%s: Could not set groups: %s\n",
+ progname, strerror(errno));
+ exit (1);
+ }
+ memset(buffer, 0, len);
+ free(buffer);
+ free(groups);
if (setresgid(-1, realgid, realgid) != 0) {
fprintf(stderr, "%s: Could not drop setgid privileges: %s\n",