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authorChristian Lamparter <chunkeey@googlemail.com>2016-04-07 18:26:51 +0200
committerÁlvaro Fernández Rojas <noltari@gmail.com>2016-04-07 18:26:51 +0200
commit3339f41d2692e2e03ece172bedbaea767270500c (patch)
tree51bde6dd87e158e4d06e7204697924b148e0797f /target/linux/brcm2708
parent9dee77795d52e38500d5e7de92b339c8f702f008 (diff)
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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 <chunkeey@googlemail.com>
Diffstat (limited to 'target/linux/brcm2708')
-rw-r--r--target/linux/brcm2708/base-files/lib/upgrade/platform.sh16
1 files changed, 15 insertions, 1 deletions
diff --git a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh
index 1d4b694..2f2aeb0 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;
}