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[Qemu-devel] [PATCH] os-posix: set groups properly for -runas


From: Stefan Hajnoczi
Subject: [Qemu-devel] [PATCH] os-posix: set groups properly for -runas
Date: Sat, 9 Jul 2011 10:22:07 +0100

Andrew Griffiths reports that -runas does not set supplementary group
IDs.  This means that gid 0 (root) is not dropped when switching to an
unprivileged user.

Add an initgroups(3) call to use the -runas user's /etc/groups
membership to update the supplementary group IDs.

Signed-off-by: Stefan Hajnoczi <address@hidden>
---
Note this needs compile testing on various POSIX host platforms.  Tested on
Linux.  Should work on BSD and Solaris.  initgroups(3) is SVr4/BSD but not in
POSIX.

 os-posix.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/os-posix.c b/os-posix.c
index 7dfb278..6f8d488 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -31,6 +31,7 @@
 /*needed for MAP_POPULATE before including qemu-options.h */
 #include <sys/mman.h>
 #include <pwd.h>
+#include <grp.h>
 #include <libgen.h>
 
 /* Needed early for CONFIG_BSD etc. */
@@ -199,6 +200,11 @@ static void change_process_uid(void)
             fprintf(stderr, "Failed to setgid(%d)\n", user_pwd->pw_gid);
             exit(1);
         }
+        if (initgroups(user_pwd->pw_name, user_pwd->pw_gid) < 0) {
+            fprintf(stderr, "Failed to initgroups(\"%s\", %d)\n",
+                    user_pwd->pw_name, user_pwd->pw_gid);
+            exit(1);
+        }
         if (setuid(user_pwd->pw_uid) < 0) {
             fprintf(stderr, "Failed to setuid(%d)\n", user_pwd->pw_uid);
             exit(1);
-- 
1.7.5.4




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