- (tim) [contrib/cygwin/README] add minires-devel requirement. Patch from

[openssh.git] / uidswap.c

diff --git a/uidswap.c b/uidswap.c
index 4cabaa444d3a5bf2e67d11f85f1a30ecc2920b24..44c4cb626c8a7d10cee86d0da45cb013316f8878 100644 (file)
--- a/uidswap.c
+++ b/uidswap.c
@@ -16,6 +16,7 @@ RCSID("$OpenBSD: uidswap.c,v 1.24 2003/05/29 16:58:45 deraadt Exp $");
 
 #include "log.h"
 #include "uidswap.h"
+#include "xmalloc.h"
 
 /*
  * Note: all these functions must work in all of the following cases:
@@ -38,7 +39,7 @@ static gid_t  saved_egid = 0;
 /* Saved effective uid. */
 static int     privileged = 0;
 static int     temporarily_use_uid_effective = 0;
-static gid_t   saved_egroups[NGROUPS_MAX], user_groups[NGROUPS_MAX];
+static gid_t   *saved_egroups = NULL, *user_groups = NULL;
 static int     saved_egroupslen = -1, user_groupslen = -1;
 
 /*
@@ -68,18 +69,38 @@ temporarily_use_uid(struct passwd *pw)
 
        privileged = 1;
        temporarily_use_uid_effective = 1;
-       saved_egroupslen = getgroups(NGROUPS_MAX, saved_egroups);
+
+       saved_egroupslen = getgroups(0, NULL);
        if (saved_egroupslen < 0)
                fatal("getgroups: %.100s", strerror(errno));
+       if (saved_egroupslen > 0) {
+               saved_egroups = xrealloc(saved_egroups,
+                   saved_egroupslen * sizeof(gid_t));
+               if (getgroups(saved_egroupslen, saved_egroups) < 0)
+                       fatal("getgroups: %.100s", strerror(errno));
+       } else { /* saved_egroupslen == 0 */
+               if (saved_egroups != NULL)
+                       xfree(saved_egroups);
+       }
 
        /* set and save the user's groups */
        if (user_groupslen == -1) {
                if (initgroups(pw->pw_name, pw->pw_gid) < 0)
                        fatal("initgroups: %s: %.100s", pw->pw_name,
                            strerror(errno));
-               user_groupslen = getgroups(NGROUPS_MAX, user_groups);
+
+               user_groupslen = getgroups(0, NULL);
                if (user_groupslen < 0)
                        fatal("getgroups: %.100s", strerror(errno));
+               if (user_groupslen > 0) {
+                       user_groups = xrealloc(user_groups,
+                           user_groupslen * sizeof(gid_t));
+                       if (getgroups(user_groupslen, user_groups) < 0)
+                               fatal("getgroups: %.100s", strerror(errno));
+               } else { /* user_groupslen == 0 */
+                       if (user_groups)
+                               xfree(user_groups);
+               }
        }
        /* Set the effective uid to the given (unprivileged) uid. */
        if (setgroups(user_groupslen, user_groups) < 0)