staging: lustre: fix buffer overflow of string buffer

commit 9563fe8a2de9db5eb087fe0e48ec335ee66f8f41 upstream.

Buffer overflow of string buffer due to non null terminated string.
Use strlcpy() when it's justifiable.
Use sizeof(var) instead of constants.

Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4629
Reviewed-on: http://review.whamcloud.com/9389
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

13 files changed, 37 insertions, 29 deletions

diff --git a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
index ecfe73302350..46a24b4ead09 100644
--- a/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
+++ b/drivers/staging/lustre/lnet/klnds/socklnd/socklnd.c
@@ -2621,8 +2621,8 @@ ksocknal_enumerate_interfaces(ksock_net_t *net)
 
 		net->ksnn_interfaces[j].ksni_ipaddr = ip;
 		net->ksnn_interfaces[j].ksni_netmask = mask;
-		strncpy(&net->ksnn_interfaces[j].ksni_name[0],
-			names[i], IFNAMSIZ);
+		strlcpy(net->ksnn_interfaces[j].ksni_name,
+			names[i], sizeof(net->ksnn_interfaces[j].ksni_name));
 		j++;
 	}
 
@@ -2805,8 +2805,9 @@ ksocknal_startup(lnet_ni_t *ni)
 				goto fail_1;
 			}
 
-			strncpy(&net->ksnn_interfaces[i].ksni_name[0],
-				ni->ni_interfaces[i], IFNAMSIZ);
+			strlcpy(net->ksnn_interfaces[i].ksni_name,
+				ni->ni_interfaces[i],
+				sizeof(net->ksnn_interfaces[i].ksni_name));
 		}
 		net->ksnn_ninterfaces = i;
 	}
diff --git a/drivers/staging/lustre/lnet/lnet/config.c b/drivers/staging/lustre/lnet/lnet/config.c
index 1b3bc8386524..75f120da0a84 100644
--- a/drivers/staging/lustre/lnet/lnet/config.c
+++ b/drivers/staging/lustre/lnet/lnet/config.c
@@ -650,8 +650,8 @@ lnet_parse_route(char *str, int *im_a_router)
 	INIT_LIST_HEAD(&nets);
 
 	/* save a copy of the string for error messages */
-	strncpy(cmd, str, sizeof(cmd) - 1);
-	cmd[sizeof(cmd) - 1] = 0;
+	strncpy(cmd, str, sizeof(cmd));
+	cmd[sizeof(cmd) - 1] = '\0';
 
 	sep = str;
 	for (;;) {
@@ -972,11 +972,13 @@ lnet_splitnets(char *source, struct list_head *nets)
 			return 0;
 
 		offset += (int)(sep - tb->ltb_text);
-		tb2 = lnet_new_text_buf(strlen(sep));
+		len = strlen(sep);
+		tb2 = lnet_new_text_buf(len);
 		if (tb2 == NULL)
 			return -ENOMEM;
 
-		strcpy(tb2->ltb_text, sep);
+		strncpy(tb2->ltb_text, sep, len);
+		tb2->ltb_text[len] = '\0';
 		list_add_tail(&tb2->ltb_list, nets);
 
 		tb = tb2;
@@ -1021,8 +1023,8 @@ lnet_match_networks(char **networksp, char *ip2nets, __u32 *ipaddrs, int nip)
 		tb = list_entry(raw_entries.next, struct lnet_text_buf_t,
 				    ltb_list);
 
-		strncpy(source, tb->ltb_text, sizeof(source)-1);
-		source[sizeof(source)-1] = 0;
+		strncpy(source, tb->ltb_text, sizeof(source));
+		source[sizeof(source)-1] = '\0';
 
 		/* replace ltb_text with the network(s) add on match */
 		rc = lnet_match_network_tokens(tb->ltb_text, ipaddrs, nip);
diff --git a/drivers/staging/lustre/lnet/selftest/conrpc.c b/drivers/staging/lustre/lnet/selftest/conrpc.c
index 64a0335934f3..1066c70434b1 100644
--- a/drivers/staging/lustre/lnet/selftest/conrpc.c
+++ b/drivers/staging/lustre/lnet/selftest/conrpc.c
@@ -612,8 +612,8 @@ lstcon_sesrpc_prep(lstcon_node_t *nd, int transop,
 		msrq = &(*crpc)->crp_rpc->crpc_reqstmsg.msg_body.mksn_reqst;
 		msrq->mksn_sid     = console_session.ses_id;
 		msrq->mksn_force   = console_session.ses_force;
-		strncpy(msrq->mksn_name, console_session.ses_name,
-			strlen(console_session.ses_name));
+		strlcpy(msrq->mksn_name, console_session.ses_name,
+			sizeof(msrq->mksn_name));
 		break;
 
 	case LST_TRANS_SESEND:
diff --git a/drivers/staging/lustre/lnet/selftest/console.c b/drivers/staging/lustre/lnet/selftest/console.c
index d315dd44ae3b..ed1bc6ac79dd 100644
--- a/drivers/staging/lustre/lnet/selftest/console.c
+++ b/drivers/staging/lustre/lnet/selftest/console.c
@@ -1739,7 +1739,8 @@ lstcon_session_new(char *name, int key, unsigned feats,
 	console_session.ses_feats_updated = 0;
 	console_session.ses_timeout = (timeout <= 0) ?
 				      LST_CONSOLE_TIMEOUT : timeout;
-	strcpy(console_session.ses_name, name);
+	strlcpy(console_session.ses_name, name,
+		sizeof(console_session.ses_name));
 
 	rc = lstcon_batch_add(LST_DEFAULT_BATCH);
 	if (rc != 0)
@@ -1959,7 +1960,8 @@ lstcon_acceptor_handle(srpc_server_rpc_t *rpc)
 	if (grp->grp_userland == 0)
 		grp->grp_userland = 1;
 
-	strcpy(jrep->join_session, console_session.ses_name);
+	strlcpy(jrep->join_session, console_session.ses_name,
+		sizeof(jrep->join_session));
 	jrep->join_timeout = console_session.ses_timeout;
 	jrep->join_status  = 0;
 
diff --git a/drivers/staging/lustre/lustre/include/lustre_disk.h b/drivers/staging/lustre/lustre/include/lustre_disk.h
index 5e1ac129a681..7c6933ffc9c1 100644
--- a/drivers/staging/lustre/lustre/include/lustre_disk.h
+++ b/drivers/staging/lustre/lustre/include/lustre_disk.h
@@ -68,6 +68,7 @@
    everything as string options */
 
 #define LMD_MAGIC    0xbdacbd03
+#define LMD_PARAMS_MAXLEN	4096
 
 /* gleaned from the mount command - no persistent info here */
 struct lustre_mount_data {
diff --git a/drivers/staging/lustre/lustre/libcfs/debug.c b/drivers/staging/lustre/lustre/libcfs/debug.c
index 1d1c67164418..170775bc7bc0 100644
--- a/drivers/staging/lustre/lustre/libcfs/debug.c
+++ b/drivers/staging/lustre/lustre/libcfs/debug.c
@@ -512,9 +512,9 @@ int libcfs_debug_init(unsigned long bufsize)
 	}
 
 	if (libcfs_debug_file_path != NULL) {
-		strncpy(libcfs_debug_file_path_arr,
-			libcfs_debug_file_path, PATH_MAX-1);
-		libcfs_debug_file_path_arr[PATH_MAX - 1] = '\0';
+		strlcpy(libcfs_debug_file_path_arr,
+			libcfs_debug_file_path,
+			sizeof(libcfs_debug_file_path_arr));
 	}
 
 	/* If libcfs_debug_mb is set to an invalid value or uninitialized
diff --git a/drivers/staging/lustre/lustre/libcfs/hash.c b/drivers/staging/lustre/lustre/libcfs/hash.c
index 030874428952..55fc2190a5bb 100644
--- a/drivers/staging/lustre/lustre/libcfs/hash.c
+++ b/drivers/staging/lustre/lustre/libcfs/hash.c
@@ -1062,8 +1062,7 @@ cfs_hash_create(char *name, unsigned cur_bits, unsigned max_bits,
 	if (hs == NULL)
 		return NULL;
 
-	strncpy(hs->hs_name, name, len);
-	hs->hs_name[len - 1] = '\0';
+	strlcpy(hs->hs_name, name, len);
 	hs->hs_flags = flags;
 
 	atomic_set(&hs->hs_refcount, 1);
diff --git a/drivers/staging/lustre/lustre/libcfs/workitem.c b/drivers/staging/lustre/lustre/libcfs/workitem.c
index e1143a566ac4..f6cc434af756 100644
--- a/drivers/staging/lustre/lustre/libcfs/workitem.c
+++ b/drivers/staging/lustre/lustre/libcfs/workitem.c
@@ -360,8 +360,8 @@ cfs_wi_sched_create(char *name, struct cfs_cpt_table *cptab,
 	if (sched == NULL)
 		return -ENOMEM;
 
-	strncpy(sched->ws_name, name, CFS_WS_NAME_LEN);
-	sched->ws_name[CFS_WS_NAME_LEN - 1] = '\0';
+	strlcpy(sched->ws_name, name, CFS_WS_NAME_LEN);
+
 	sched->ws_cptab = cptab;
 	sched->ws_cpt = cpt;
 
diff --git a/drivers/staging/lustre/lustre/llite/dir.c b/drivers/staging/lustre/lustre/llite/dir.c
index 5c9502b5b358..951259a98323 100644
--- a/drivers/staging/lustre/lustre/llite/dir.c
+++ b/drivers/staging/lustre/lustre/llite/dir.c
@@ -641,7 +641,7 @@ static int ll_send_mgc_param(struct obd_export *mgc, char *string)
 	if (!msp)
 		return -ENOMEM;
 
-	strncpy(msp->mgs_param, string, MGS_PARAM_MAXLEN);
+	strlcpy(msp->mgs_param, string, sizeof(msp->mgs_param));
 	rc = obd_set_info_async(NULL, mgc, sizeof(KEY_SET_INFO), KEY_SET_INFO,
 				sizeof(struct mgs_send_param), msp, NULL);
 	if (rc)
diff --git a/drivers/staging/lustre/lustre/lov/lov_pool.c b/drivers/staging/lustre/lustre/lov/lov_pool.c
index b03827ef6514..b43ce6cd64c2 100644
--- a/drivers/staging/lustre/lustre/lov/lov_pool.c
+++ b/drivers/staging/lustre/lustre/lov/lov_pool.c
@@ -412,8 +412,7 @@ int lov_pool_new(struct obd_device *obd, char *poolname)
 	if (!new_pool)
 		return -ENOMEM;
 
-	strncpy(new_pool->pool_name, poolname, LOV_MAXPOOLNAME);
-	new_pool->pool_name[LOV_MAXPOOLNAME] = '\0';
+	strlcpy(new_pool->pool_name, poolname, sizeof(new_pool->pool_name));
 	new_pool->pool_lobd = obd;
 	/* ref count init to 1 because when created a pool is always used
 	 * up to deletion
diff --git a/drivers/staging/lustre/lustre/obdclass/obd_mount.c b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
index 48003d5325e3..7617c57d16e0 100644
--- a/drivers/staging/lustre/lustre/obdclass/obd_mount.c
+++ b/drivers/staging/lustre/lustre/obdclass/obd_mount.c
@@ -892,7 +892,7 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 	}
 	lmd->lmd_magic = LMD_MAGIC;
 
-	lmd->lmd_params = kzalloc(4096, GFP_NOFS);
+	lmd->lmd_params = kzalloc(LMD_PARAMS_MAXLEN, GFP_NOFS);
 	if (!lmd->lmd_params)
 		return -ENOMEM;
 	lmd->lmd_params[0] = '\0';
@@ -978,7 +978,7 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 				goto invalid;
 			clear++;
 		} else if (strncmp(s1, "param=", 6) == 0) {
-			int length;
+			size_t length, params_length;
 			char *tail = strchr(s1 + 6, ',');
 
 			if (tail == NULL)
@@ -986,8 +986,12 @@ static int lmd_parse(char *options, struct lustre_mount_data *lmd)
 			else
 				length = tail - s1;
 			length -= 6;
+			params_length = strlen(lmd->lmd_params);
+			if (params_length + length + 1 >= LMD_PARAMS_MAXLEN)
+				return -E2BIG;
 			strncat(lmd->lmd_params, s1 + 6, length);
-			strcat(lmd->lmd_params, " ");
+			lmd->lmd_params[params_length + length] = '\0';
+			strlcat(lmd->lmd_params, " ", LMD_PARAMS_MAXLEN);
 			clear++;
 		} else if (strncmp(s1, "osd=", 4) == 0) {
 			rc = lmd_parse_string(&lmd->lmd_osd_type, s1 + 4);
diff --git a/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c b/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
index ce036a1ac466..ac87aa12bd7e 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/ptlrpcd.c
@@ -422,6 +422,7 @@ static int ptlrpcd(void *arg)
 	complete(&pc->pc_starting);
 
 	/*
+
 	 * This mainloop strongly resembles ptlrpc_set_wait() except that our
 	 * set never completes.  ptlrpcd_check() calls ptlrpc_check_set() when
 	 * there are requests in the set. New requests come in on the set's
diff --git a/drivers/staging/lustre/lustre/ptlrpc/sec_config.c b/drivers/staging/lustre/lustre/ptlrpc/sec_config.c
index 7ff948fe1424..7a206705865b 100644
--- a/drivers/staging/lustre/lustre/ptlrpc/sec_config.c
+++ b/drivers/staging/lustre/lustre/ptlrpc/sec_config.c
@@ -83,8 +83,7 @@ int sptlrpc_parse_flavor(const char *str, struct sptlrpc_flavor *flvr)
 		return 0;
 	}
 
-	strncpy(buf, str, sizeof(buf));
-	buf[sizeof(buf) - 1] = '\0';
+	strlcpy(buf, str, sizeof(buf));
 
 	bulk = strchr(buf, '-');
 	if (bulk)