Simon Wunderlich <simon.wunderl...@open-mesh.com> [2016-11-17 11:19:48]:
Hi Simon, > On the other hand, swapping the u-boot is not so trivial, at least without > opening/soldering/modifying the flash from outside, which is considered a > reasonable hurdle. the more I'm exploring the secrets of U-Boot code with pepe2k's help, the more I'm puzzled and really wondering why is someone doing all this locking. You or someone else for OpenMesh has put so much energy to make the U-Boot use RSA keys for image verification, but on the other hand you keep the ART partition, where you store the RSA key, writable from the system. So it's quite trivial to unlock the device using the following commands: ssh root@router RSA_KEY_HEADER_SIZE=0x20 RSA_KEY_OFFSET=0x8000 ART_PARTITION=mtd7 BYTES=$((RSA_KEY_HEADER_SIZE)) SEEK=$(($RSA_KEY_OFFSET/$RSA_KEY_HEADER_SIZE)) dd if=/dev/zero bs=$BYTES count=1 | dd of=/dev/$ART_PARTITION bs=$BYTES seek=$SEEK count=1 conv=notrunc reboot It works on OM5P and MR1750. It doesn't seem like a big deal, no soldering needed. Am I missing something? -- ynezz _______________________________________________ Lede-dev mailing list Lede-dev@lists.infradead.org http://lists.infradead.org/mailman/listinfo/lede-dev
