A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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Merge "hwkm: fail on last byte corruption"

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qctecmdr 2020-08-04 18:37:06 -07:00 • committed by Gerrit - the friendly Code Review server
commit 10a538a0bd
1 changed files with 13 additions and 0 deletions
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13
drivers/soc/qcom/hwkm.c
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@ -505,6 +505,19 @@ static int qti_handle_key_unwrap_import(const struct hwkm_cmd *cmd_in,
return -EINVAL;
}
/*
* Unwrap in HWKM does not do an integrity check for the last byte
* (68th byte) as it is a noop. However, we need to make sure no
* part of the keyblob provided was tampered with, even though it
* is a noop. Adding an explicit check for the last byte before
* providing to unwrap command.
*/
if ((cmd_in->unwrap.wkb[EXPECTED_UNWRAP_KEY_SIZE - 1]) != 0x00) {
pr_err("%s: Last byte corrupted, expecting zero value\n",
__func__);
return -EINVAL;
}
memcpy(cmd, &operation, OPERATION_INFO_LENGTH);
memcpy(cmd + COMMAND_WRAPPED_KEY_IDX, cmd_in->unwrap.wkb,
cmd_in->unwrap.sz);