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Fix crash when netgroups include recursive dependency

This commit is contained in:
Honza Horák 2013-05-27 12:55:10 +02:00
parent 098e209f10
commit c387ac8088
2 changed files with 74 additions and 1 deletions
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68
ypserv-2.31-netgrprecur.patch Normal file
View File

@ -0,0 +1,68 @@
Upstream didn't accepted this patch and only replied that user should fix
the configuration. Since we believe that even if configuration is wrong,
program (especially daemon) shouldn't crash with segfault, we rather fix
this on our own to print a nice error when level of recursion exceeds 128.
diff -up ypserv-2.31/revnetgroup/getnetgrent.c.recursive ypserv-2.31/revnetgroup/getnetgrent.c
--- ypserv-2.31/revnetgroup/getnetgrent.c.recursive 2013-05-17 12:37:08.143675080 +0200
+++ ypserv-2.31/revnetgroup/getnetgrent.c 2013-05-17 14:20:49.376566354 +0200
@@ -31,6 +31,8 @@
#include "hash.h"
+#define NETGROUPENTRY_RECURSION_LIMIT 128
+
extern hash_t *input;
void rev_setnetgrent (const char *);
@@ -53,7 +55,7 @@ struct netgrlist
};
-static void rev_expand_netgroupentry (const char *, struct netgrlist *);
+static void rev_expand_netgroupentry (const char *, struct netgrlist *, int level);
static void rev_parse_entry (char *, char *, struct netgrlist *);
static void rev_netgr_free (struct netgrlist *);
static struct netgrlist list = {0, 0, NULL};
@@ -83,7 +85,7 @@ rev_setnetgrent (const char *netgr)
{
rev_endnetgrent ();
netgroup = strdup (netgr);
- rev_expand_netgroupentry (netgr, &list);
+ rev_expand_netgroupentry (netgr, &list, 0);
}
first = 1;
}
@@ -141,7 +143,7 @@ rev_netgr_free (struct netgrlist *list)
}
static void
-rev_expand_netgroupentry (const char *netgr, struct netgrlist *list)
+rev_expand_netgroupentry (const char *netgr, struct netgrlist *list, int level)
{
char *outval = NULL;
char *outptr = NULL;
@@ -156,6 +158,14 @@ rev_expand_netgroupentry (const char *ne
if (outptr == NULL)
return;
+ /* check the recursion - return if we exceed the recursion limit */
+ if (level >= NETGROUPENTRY_RECURSION_LIMIT)
+ {
+ fprintf (stderr, "WARNING: level of recursion in netgroup %s reached"
+ "%d, entry ignored\n", netgr, NETGROUPENTRY_RECURSION_LIMIT);
+ return;
+ }
+
/* make a copy to work with */
outval = strdup (outptr);
if (outval == NULL)
@@ -198,7 +208,7 @@ rev_expand_netgroupentry (const char *ne
*end = '\0';
/* recursion */
- rev_expand_netgroupentry (start, list);
+ rev_expand_netgroupentry (start, list, level+1);
}
/* skip to the next entry */

7
ypserv.spec
View File

@ -4,7 +4,7 @@ Summary: The NIS (Network Information Service) server
Url: http://www.linux-nis.org/nis/ypserv/index.html
Name: ypserv
Version: 2.31
Release: 2%{?dist}
Release: 3%{?dist}
License: GPLv2
Group: System Environment/Daemons
Source0: http://www.linux-nis.org/download/ypserv/ypserv-%{version}.tar.bz2
@ -31,6 +31,7 @@ Patch6: ypserv-2.24-manfix.patch
Patch7: ypserv-2.24-aliases.patch
Patch8: ypserv-2.27-confpost.patch
Patch9: ypserv-2.29-relro.patch
Patch10: ypserv-2.31-netgrprecur.patch
BuildRequires: tokyocabinet-devel
BuildRequires: systemd-units
@ -65,6 +66,7 @@ machines.
%patch7 -p1 -b .aliases
%patch8 -p1 -b .confpost
%patch9 -p1 -b .relro
%patch10 -p1 -b .netgrprecur
autoreconf
@ -256,6 +258,9 @@ fi
%{_includedir}/*/*
%changelog
* Mon May 27 2013 Honza Horak <hhorak@redhat.com> - 2.31-3
- Fix crash when netgroups include recursive dependency
* Thu May 09 2013 Honza Horak <hhorak@redhat.com> - 2.31-2
- Enable PrivateTmp feature, just for the case