Merge branch 'dejavusec' into v5_0

Fixes for a few security vulnerabilities reported by Mick Ayzenberg
of DejaVu Security.

AUTHORS.md

@@ -3,7 +3,7 @@
 ## Core
 
 * Multiple algorithms and switching: Jan Berdajs <mrbrdo at mrbrdo dot net> 15bULC8snaKAMeFb3xBmmhbWj1xyTmBUfm
-* Scrypt-only refactor: Noel Maersk <veox at wemakethings dot net> LfxRFgXzA13TSTxgFGUFEtumv5ShGzAmLw
+* Historical scrypt-only refactor: Noel Maersk <veox at wemakethings dot net> 12jF1VExtmmMu8D36vo4Y4CYqLK5yCtLC4
 * Core: Martin Danielsen <kalroth {at} gmail _dot_ com> 1DNBcSEENBwDKrcTyTW61ezWhzsPy5imkn
 * Core: Con Kolivas <kernel [at] kolivas {dot} org> 15qSxP1SQcUX3o4nhkfdbgyoWEFMomJ4rZ
 * Core: Luke Dashjr <luke-jr+cgminer @at@ utopios .dot. org> 1QATWksNFGeUJCWBrN4g6hGM178Lovm7Wh
@@ -33,7 +33,6 @@ updated by many others.
 
 ## Testing, bug fixes, improvements
 
-* Hot-switching OpenCL kernel (N-Factor): Jan Berdajs <mrbrdo>
 * Michael Fiano <mfiano>
 * Gabriel Devenyi <gdevenyi>
 * Benjamin Herrenschmidt <ozbenh>

sgminer.c

@@ -1,4 +1,5 @@
 /*
+ * Copyright 2013-2014 sgminer developers (see AUTHORS.md)
  * Copyright 2011-2013 Con Kolivas
  * Copyright 2011-2012 Luke Dashjr
  * Copyright 2010 Jeff Garzik
@@ -756,8 +757,7 @@ static void setup_url(struct pool *pool, char *arg)
     return;
 
   opt_set_charp(arg, &pool->rpc_url);
-  if (strncmp(arg, "http://", 7) &&
-      strncmp(arg, "https://", 8)) {
+  if (strncmp(arg, "http://", 7) && strncmp(arg, "https://", 8)) {
     char *httpinput;
 
     httpinput = (char *)malloc(255);

util.c

@@ -1220,6 +1220,13 @@ bool extract_sockaddr(char *url, char **sockaddr_url, char **sockaddr_port)
 	if (url_len < 1)
 		return false;
 	
+	if (url_len >= sizeof(url_address))
+	{
+		applog(LOG_WARNING, "%s: Truncating overflowed address '%.*s'",
+		       __func__, url_len, url_begin);
+		url_len = sizeof(url_address) - 1;
+	}
+
 	sprintf(url_address, "%.*s", url_len, url_begin);
 
 	if (port_len) {
@@ -1593,17 +1600,23 @@ static bool parse_notify(struct pool *pool, json_t *val)
 		pool->swork.nbit,
 		"00000000", /* nonce */
 		workpadding);
-	if (unlikely(!hex2bin(pool->header_bin, header, 128)))
-		quit(1, "Failed to convert header to header_bin in parse_notify");
+	if (unlikely(!hex2bin(pool->header_bin, header, 128))) {
+		applog(LOG_WARNING, "%s: Failed to convert header to header_bin, got %s", __func__, header);
+		pool_failed(pool);
+		// TODO: memory leaks? goto out, clean up there?
+		return false;
+	}
 
 	cb1 = (unsigned char *)calloc(cb1_len, 1);
 	if (unlikely(!cb1))
 		quithere(1, "Failed to calloc cb1 in parse_notify");
 	hex2bin(cb1, coinbase1, cb1_len);
+
 	cb2 = (unsigned char *)calloc(cb2_len, 1);
 	if (unlikely(!cb2))
 		quithere(1, "Failed to calloc cb2 in parse_notify");
 	hex2bin(cb2, coinbase2, cb2_len);
+
 	free(pool->coinbase);
 	align_len(&alloc_len);
 	pool->coinbase = (unsigned char *)calloc(alloc_len, 1);
@@ -1611,6 +1624,7 @@ static bool parse_notify(struct pool *pool, json_t *val)
 		quit(1, "Failed to calloc pool coinbase in parse_notify");
 	memcpy(pool->coinbase, cb1, cb1_len);
 	memcpy(pool->coinbase + cb1_len, pool->nonce1bin, pool->n1_len);
+	// NOTE: gap for nonce2, filled at work generation time
 	memcpy(pool->coinbase + cb1_len + pool->n1_len + pool->n2size, cb2, cb2_len);
 	cg_wunlock(&pool->data_lock);
 
@@ -1711,15 +1725,14 @@ static void __suspend_stratum(struct pool *pool)
 
 static bool parse_reconnect(struct pool *pool, json_t *val)
 {
-	char *sockaddr_url, *stratum_port, *tmp;
-	char *url, *port, address[256];
-
 	if (opt_disable_client_reconnect) {
-		applog(LOG_WARNING, "Stratum client.reconnect forbidden, aborting.");
+		applog(LOG_WARNING, "Stratum client.reconnect received but is disabled, not reconnecting.");
 		return false;
 	}
 
-	memset(address, 0, 255);
+	char *url, *port, address[256];
+	char *sockaddr_url, *stratum_port, *tmp; /* Tempvars. */
+
 	url = (char *)json_string_value(json_array_get(val, 0));
 	if (!url)
 		url = pool->sockaddr_url;
@@ -1728,8 +1741,7 @@ static bool parse_reconnect(struct pool *pool, json_t *val)
 	if (!port)
 		port = pool->stratum_port;
 
-	sprintf(address, "%s:%s", url, port);
-
+	snprintf(address, sizeof(address), "%s:%s", url, port);
 	if (!extract_sockaddr(address, &sockaddr_url, &stratum_port))
 		return false;
 
@@ -2505,7 +2517,8 @@ resend:
 		goto out;
 	}
 	n2size = json_integer_value(json_array_get(res_val, 2));
-	if (!n2size) {
+	if (n2size < 1)
+	{
 		applog(LOG_INFO, "Failed to get n2size in initiate_stratum");
 		free(sessionid);
 		free(nonce1);