| Message ID | 1460046411-17102-1-git-send-email-chunkeey@googlemail.com |
|---|---|
| State | Changes Requested |
| Headers | show |
diff --git a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh index 1d4b694..631aa69 100644 --- a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh +++ b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh @@ -1,5 +1,20 @@ +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; }
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 <chunkeey@googlemail.com> --- .../linux/brcm2708/base-files/lib/upgrade/platform.sh | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-)