From 60290ed40c467c7742b1a7f18c042b442b47a983 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Tue, 7 Apr 2015 14:13:56 +0000
Subject: [PATCH] bcm53xx: compare provided firmware magic with device magic
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45290 3c298f89-4303-0410-b956-a3cf2f4a3e73
---
 .../bcm53xx/base-files/lib/upgrade/platform.sh     | 31 ++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
index 3d911d1246..17456b6cda 100644
--- a/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
@@ -6,6 +6,10 @@ get_magic_long_at() {
 	dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%02x"'
 }
 
+platform_machine() {
+	cat /proc/device-tree/compatible | tr '\0' '\t' | cut -f 1
+}
+
 platform_flash_type() {
 	# On NAND devices "rootfs" is UBI volume, so won't be find in /proc/mtd
 	grep -q "\"rootfs\"" /proc/mtd && {
@@ -16,6 +20,16 @@ platform_flash_type() {
 	echo "nand"
 }
 
+platform_expected_image() {
+	local machine=$(platform_machine)
+
+	case "$machine" in
+		"netgear,r6250v1")	echo "chk U12H245T00_NETGEAR"; return;;
+		"netgear,r6300v2")	echo "chk U12H240T00_NETGEAR"; return;;
+		"netgear,r8000")	echo "chk U12H315T00_NETGEAR"; return;;
+	esac
+}
+
 platform_identify() {
 	local magic
 
@@ -49,14 +63,21 @@ platform_check_image() {
 	}
 
 	local file_type=$(platform_identify "$1")
+	local magic
 
 	case "$file_type" in
 		"chk")
 			local header_len=$((0x$(get_magic_long_at "$1" 4)))
 			local board_id_len=$(($header_len - 40))
 			local board_id=$(dd if="$1" skip=40 bs=1 count=$board_id_len 2>/dev/null | hexdump -v -e '1/1 "%c"')
+			local dev_board_id=$(platform_expected_image)
 			echo "Found CHK image with device board_id $board_id"
 
+			[ -n "$dev_board_id" -a "chk $board_id" != "$dev_board_id" ] && {
+				echo "Firmware board_id doesn't match device board_id ($dev_board_id)"
+				return 1
+			}
+
 			magic=$(get_magic_long_at "$1" "$header_len")
 			[ "$magic" != "48445230" ] && {
 				echo "No valid TRX firmware in the CHK image"
@@ -66,8 +87,14 @@ platform_check_image() {
 			return 0
 		;;
 		"cybertan")
-			local magic=$(dd if="$1" bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%c"')
-			echo "Found CyberTAN image with device magic: $magic"
+			local pattern=$(dd if="$1" bs=1 count=4 2>/dev/null | hexdump -v -e '1/1 "%c"')
+			local dev_pattern=$(platform_expected_image)
+			echo "Found CyberTAN image with device pattern: $pattern"
+
+			[ -n "$dev_pattern" -a "cybertan $pattern" != "$dev_pattern" ] && {
+				echo "Firmware pattern doesn't match device pattern ($dev_pattern)"
+				return 1
+			}
 
 			magic=$(get_magic_long_at "$1" 32)
 			[ "$magic" != "48445230" ] && {
-- 
2.11.0