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authorAndreas Schwab <schwab@suse.de>2014-05-08 16:53:01 +0200
committerAndreas Schwab <schwab@suse.de>2014-05-12 15:17:51 +0200
commit315eb1d86aea489cd6325fd1c2521dcfb4fc0e1c (patch)
tree95e476e2d0ce5885684e619ddbcb5996241f4c94 /nis/nss_nis
parent91df99f7f25d7b63ba36d54e41bc33ac6901f22d (diff)
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Fix unbound stack use in NIS NSS module
Diffstat (limited to 'nis/nss_nis')
-rw-r--r--nis/nss_nis/nis-hosts.c14
-rw-r--r--nis/nss_nis/nis-initgroups.c7
-rw-r--r--nis/nss_nis/nis-network.c7
-rw-r--r--nis/nss_nis/nis-service.c14
4 files changed, 42 insertions, 0 deletions
diff --git a/nis/nss_nis/nis-hosts.c b/nis/nss_nis/nis-hosts.c
index 462176ea03..d6192b1c77 100644
--- a/nis/nss_nis/nis-hosts.c
+++ b/nis/nss_nis/nis-hosts.c
@@ -270,6 +270,13 @@ internal_gethostbyname2_r (const char *name, int af, struct hostent *host,
/* Convert name to lowercase. */
size_t namlen = strlen (name);
+ /* Limit name length to the maximum size of an RPC packet. */
+ if (namlen > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
char name2[namlen + 1];
size_t i;
@@ -461,6 +468,13 @@ _nss_nis_gethostbyname4_r (const char *name, struct gaih_addrtuple **pat,
/* Convert name to lowercase. */
size_t namlen = strlen (name);
+ /* Limit name length to the maximum size of an RPC packet. */
+ if (namlen > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
char name2[namlen + 1];
size_t i;
diff --git a/nis/nss_nis/nis-initgroups.c b/nis/nss_nis/nis-initgroups.c
index e8fcca1bb1..9542faea48 100644
--- a/nis/nss_nis/nis-initgroups.c
+++ b/nis/nss_nis/nis-initgroups.c
@@ -150,6 +150,13 @@ initgroups_netid (uid_t uid, gid_t group, long int *start, long int *size,
gid_t **groupsp, long int limit, int *errnop,
const char *domainname)
{
+ /* Limit domainname length to the maximum size of an RPC packet. */
+ if (strlen (domainname) > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
/* Prepare the key. The form is "unix.UID@DOMAIN" with the UID and
DOMAIN field filled in appropriately. */
char key[sizeof ("unix.@") + sizeof (uid_t) * 3 + strlen (domainname)];
diff --git a/nis/nss_nis/nis-network.c b/nis/nss_nis/nis-network.c
index f28fbdaa4f..f1b72bcd75 100644
--- a/nis/nss_nis/nis-network.c
+++ b/nis/nss_nis/nis-network.c
@@ -179,6 +179,13 @@ _nss_nis_getnetbyname_r (const char *name, struct netent *net, char *buffer,
/* Convert name to lowercase. */
size_t namlen = strlen (name);
+ /* Limit name length to the maximum size of an RPC packet. */
+ if (namlen > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
char name2[namlen + 1];
size_t i;
diff --git a/nis/nss_nis/nis-service.c b/nis/nss_nis/nis-service.c
index f9b4a86d76..44e4e13f86 100644
--- a/nis/nss_nis/nis-service.c
+++ b/nis/nss_nis/nis-service.c
@@ -271,6 +271,13 @@ _nss_nis_getservbyname_r (const char *name, const char *protocol,
/* If the protocol is given, we could try if our NIS server knows
about services.byservicename map. If yes, we only need one query. */
size_t keylen = strlen (name) + (protocol ? 1 + strlen (protocol) : 0);
+ /* Limit key length to the maximum size of an RPC packet. */
+ if (keylen > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
char key[keylen + 1];
/* key is: "name/proto" */
@@ -355,6 +362,13 @@ _nss_nis_getservbyport_r (int port, const char *protocol,
Otherwise try first port/tcp, then port/udp and then fallback
to sequential scanning of services.byname. */
const char *proto = protocol != NULL ? protocol : "tcp";
+ /* Limit protocol name length to the maximum size of an RPC packet. */
+ if (strlen (proto) > UDPMSGSIZE)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_UNAVAIL;
+ }
+
do
{
/* key is: "port/proto" */