libubox: backport security patches

This backports some security relevant patches from libubox master. These
patches should not change the existing API and ABI so that old
applications still work like before without any recompilation.
Application can now also use more secure APIs.

The new more secure interfaces are also available, but not used.

OpenWrt master and 19.07 already have these patches by using a more
recent libubox version.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

1 files changed, 66 insertions, 0 deletions

diff --git a/package/libs/libubox/patches/0015-blobmsg_json-prefer-snprintf-usage.patch b/package/libs/libubox/patches/0015-blobmsg_json-prefer-snprintf-usage.patch
new file mode 100644
index 0000000000..d5709a6e4f
--- /dev/null
+++ b/package/libs/libubox/patches/0015-blobmsg_json-prefer-snprintf-usage.patch
@@ -0,0 +1,66 @@
+From 0e330ec3662795aea42ac36ecf7a9f32a249c36d Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20=C5=A0tetiar?= <ynezz@true.cz>
+Date: Tue, 14 Jan 2020 09:05:02 +0100
+Subject: blobmsg_json: prefer snprintf usage
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Better safe than sorry and while at it prefer use of PRId16 and PRId32
+formatting constants as well.
+
+Reviewed-by: Jo-Philipp Wich <jo@mein.io>
+Signed-off-by: Petr Štetiar <ynezz@true.cz>
+---
+ blobmsg_json.c | 16 ++++++++--------
+ 1 file changed, 8 insertions(+), 8 deletions(-)
+
+--- a/blobmsg_json.c
++++ b/blobmsg_json.c
+@@ -203,7 +203,7 @@ static void blobmsg_format_string(struct
+ 		buf[1] = escape;
+ 
+ 		if (escape == 'u') {
+-			sprintf(buf + 4, "%02x", (unsigned char) *p);
++			snprintf(buf + 4, sizeof(buf) - 4, "%02x", (unsigned char) *p);
+ 			len = 6;
+ 		} else {
+ 			len = 2;
+@@ -220,7 +220,7 @@ static void blobmsg_format_json_list(str
+ static void blobmsg_format_element(struct strbuf *s, struct blob_attr *attr, bool without_name, bool head)
+ {
+ 	const char *data_str;
+-	char buf[32];
++	char buf[317];
+ 	void *data;
+ 	int len;
+ 
+@@ -244,22 +244,22 @@ static void blobmsg_format_element(struc
+ 	data_str = buf;
+ 	switch(blob_id(attr)) {
+ 	case BLOBMSG_TYPE_UNSPEC:
+-		sprintf(buf, "null");
++		snprintf(buf, sizeof(buf), "null");
+ 		break;
+ 	case BLOBMSG_TYPE_BOOL:
+-		sprintf(buf, "%s", *(uint8_t *)data ? "true" : "false");
++		snprintf(buf, sizeof(buf), "%s", *(uint8_t *)data ? "true" : "false");
+ 		break;
+ 	case BLOBMSG_TYPE_INT16:
+-		sprintf(buf, "%d", (int16_t) be16_to_cpu(*(uint16_t *)data));
++		snprintf(buf, sizeof(buf), "%" PRId16, (int16_t) be16_to_cpu(*(uint16_t *)data));
+ 		break;
+ 	case BLOBMSG_TYPE_INT32:
+-		sprintf(buf, "%d", (int32_t) be32_to_cpu(*(uint32_t *)data));
++		snprintf(buf, sizeof(buf), "%" PRId32, (int32_t) be32_to_cpu(*(uint32_t *)data));
+ 		break;
+ 	case BLOBMSG_TYPE_INT64:
+-		sprintf(buf, "%" PRId64, (int64_t) be64_to_cpu(*(uint64_t *)data));
++		snprintf(buf, sizeof(buf), "%" PRId64, (int64_t) be64_to_cpu(*(uint64_t *)data));
+ 		break;
+ 	case BLOBMSG_TYPE_DOUBLE:
+-		sprintf(buf, "%lf", blobmsg_get_double(attr));
++		snprintf(buf, sizeof(buf), "%lf", blobmsg_get_double(attr));
+ 		break;
+ 	case BLOBMSG_TYPE_STRING:
+ 		blobmsg_format_string(s, data);