When the bootloader is UNLOCKED, it should be possible to boot Android even if AVB reports verification errors [1].
This allows developers to flash modified partitions on userdebug/engineering builds.
Developers can do so on unlocked devices with: $ fastboot flash --disable-verity --disable-verification vbmeta vbmeta.img
In such case, bootmeth_android refuses to boot.
Allow the boot to continue when the device is UNLOCKED and AVB reports verification errors.
[1] https://source.android.com/docs/security/features/verifiedboot/boot-flow#unl... Fixes: 125d9f3306ea ("bootstd: Add a bootmeth for Android") Signed-off-by: Mattijs Korpershoek mkorpershoek@baylibre.com --- boot/bootmeth_android.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/boot/bootmeth_android.c b/boot/bootmeth_android.c index 2cd167f80280801618a317a65e93a10e70a0d9ee..564d21784feb0667bf9bed2a59be0a232601a7dd 100644 --- a/boot/bootmeth_android.c +++ b/boot/bootmeth_android.c @@ -407,11 +407,16 @@ static int run_avb_verification(struct bootflow *bflow) AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE, &out_data);
- if (result != AVB_SLOT_VERIFY_RESULT_OK) { + if (result != AVB_SLOT_VERIFY_RESULT_OK && !unlocked) { printf("Verification failed, reason: %s\n", str_avb_slot_error(result)); avb_slot_verify_data_free(out_data); return log_msg_ret("avb verify", -EIO); + } else if (result != AVB_SLOT_VERIFY_RESULT_ERROR_VERIFICATION && unlocked) { + printf("Unlocked verification failed, reason: %s\n", + str_avb_slot_error(result)); + avb_slot_verify_data_free(out_data); + return log_msg_ret("avb verify unlocked", -EIO); }
if (unlocked) @@ -427,9 +432,11 @@ static int run_avb_verification(struct bootflow *bflow) goto free_out_data; }
- ret = avb_append_commandline(bflow, out_data->cmdline); - if (ret < 0) - goto free_out_data; + if (result == AVB_SLOT_VERIFY_RESULT_OK) { + ret = avb_append_commandline(bflow, out_data->cmdline); + if (ret < 0) + goto free_out_data; + }
return 0;