brcm47xx: compare provided firmware magic with device magic

This makes sysupgrade reject firmware images for different devices.
Right now only support for 2 sample devices is implemented.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@45170 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/brcm47xx/base-files/lib/upgrade/platform.sh b/target/linux/brcm47xx/base-files/lib/upgrade/platform.sh
index f96935b..815c26c 100644 (file)
--- a/target/linux/brcm47xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/brcm47xx/base-files/lib/upgrade/platform.sh
@@ -6,6 +6,26 @@ get_magic_long_at() {
        dd if="$1" skip=$2 bs=1 count=4 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 }
 
+platform_machine() {
+       grep "machine" /proc/cpuinfo | sed "s/.*:[ \t]*//"
+}
+
+platform_expected_chk_board_id() {
+       local machine=$(platform_machine)
+
+       case "$machine" in
+               "Netgear WNDR4000")     echo "U12H181T00_NETGEAR"; return;;
+       esac
+}
+
+platform_expected_cybertan_pattern() {
+       local machine=$(platform_machine)
+
+       case "$machine" in
+               "Linksys E1000 V2.1")   echo "E100"; return;;
+       esac
+}
+
 brcm47xx_identify() {
        local magic
 
@@ -41,8 +61,14 @@ platform_check_image() {
                        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_chk_board_id)
                        echo "Found CHK image with device board_id $board_id"
 
+                       [ -n "$dev_board_id" -a "$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")
                        [ "$magic" != "48445230" ] && {
                                echo "No valid TRX firmware in the CHK image"
@@ -52,8 +78,14 @@ platform_check_image() {
                        return 0
                ;;
                "cybertan")
-                       magic=$(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_cybertan_pattern)
+                       echo "Found CyberTAN image with device pattern: $pattern"
+
+                       [ -n "$dev_pattern" -a "$pattern" != "$dev_pattern" ] && {
+                               echo "Firmware pattern doesn't match device pattern ($dev_pattern)"
+                               return 1
+                       }
 
                        magic=$(get_magic_long_at "$1" 32)
                        [ "$magic" != "48445230" ] && {