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Fix off-by-one mkey revision errors

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This commit is contained in:
TuxSH 2018-03-14 16:03:16 +01:00
parent 6a0946378a
commit 965971edbd
1 changed files with 16 additions and 9 deletions
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17
exosphere/src/smc_user.c
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@ -283,11 +283,12 @@ uint32_t user_generate_specific_aes_key(smc_args_t *args) {
wrapped_key[0] = args->X[1];
wrapped_key[1] = args->X[2];
master_key_rev = args->X[3];
if (mkey_get_revision() < MASTERKEY_REVISION_400_CURRENT) {
master_key_rev &= 0xFFFFFFFF;
master_key_rev = (unsigned int)args->X[3];
if (master_key_rev > 0) {
master_key_rev -= 1;
}
if (master_key_rev > MASTERKEY_REVISION_MAX) {
if (master_key_rev >= MASTERKEY_REVISION_MAX) {
return 2;
}
@ -557,6 +558,10 @@ uint32_t user_unwrap_rsa_oaep_wrapped_titlekey(smc_args_t *args) {
void *user_modulus = (void *)args->X[2];
unsigned int master_key_rev = (unsigned int)args->X[7];
if(master_key_rev > 0) {
master_key_rev -= 1;
}
if (mkey_get_revision() > 0 && master_key_rev >= MASTERKEY_REVISION_MAX) {
return 2;
} else {
@ -616,7 +621,9 @@ uint32_t user_unwrap_aes_wrapped_titlekey(smc_args_t *args) {
aes_wrapped_titlekey[1] = args->X[2];
unsigned int master_key_rev = (unsigned int)args->X[3];
if (master_key_rev > 0) {
master_key_rev -= 1;
}
if (mkey_get_revision() > 0 && master_key_rev >= MASTERKEY_REVISION_MAX) {
return 2;
} else {