From 3339f41d2692e2e03ece172bedbaea767270500c Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Thu, 7 Apr 2016 18:26:51 +0200 Subject: [PATCH] brcm2708: implement sysupgrade image check Implement a crude but functioning sysupgrade image check for the Raspberry Pi. The code only checks if the master boot record boot signature (0x55aa) is present in the first 512-bytes at the correct location. This can prevent the odd bricking of a system when flashing the wrong file. Signed-off-by: Christian Lamparter --- .../brcm2708/base-files/lib/upgrade/platform.sh | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh index 1d4b694574..2f2aeb098e 100644 --- a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh +++ b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh @@ -1,5 +1,19 @@ +get_magic_at() { + local file="$1" + local pos="$2" + get_image "$file" | dd bs=1 count=2 skip="$pos" 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"' +} + platform_check_image() { - # i know no way to verify the image + local file="$1" + local magic + + magic=$(get_magic_at "$file" 510) + [ "$magic" != "55aa" ] && { + echo "Failed to verify MBR boot signature." + return 1 + } + return 0; } -- 2.30.2