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secure_boot/esp32(s2,c3): Disable read protecting of efuses

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When secure boot is enabled, disable the ability to read protect
efuses that contain the digest.
This commit is contained in:
Sachin Parekh
2021-08-12 15:04:55 +05:30
parent 49acb81a87
commit f430e86c0f
5 changed files with 53 additions and 3 deletions
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6
components/bootloader_support/src/esp32c3/flash_encryption_secure_features.c
View File

@@ -40,5 +40,11 @@ esp_err_t esp_flash_encryption_enable_secure_features(void)
esp_efuse_write_field_bit(ESP_EFUSE_DIS_LEGACY_SPI_BOOT);
#if defined(CONFIG_SECURE_BOOT_V2_ENABLED) && !defined(CONFIG_SECURE_BOOT_V2_ALLOW_EFUSE_RD_DIS)
// This bit is set when enabling Secure Boot V2, but we can't enable it until this later point in the first boot
// otherwise the Flash Encryption key cannot be read protected
esp_efuse_write_field_bit(ESP_EFUSE_WR_DIS_RD_DIS);
#endif
return ESP_OK;
}

15
components/bootloader_support/src/esp32c3/secure_boot_secure_features.c
View File

@@ -40,5 +40,20 @@ esp_err_t esp_secure_boot_enable_secure_features(void)
esp_efuse_write_field_bit(ESP_EFUSE_SECURE_BOOT_EN);
#ifndef CONFIG_SECURE_BOOT_V2_ALLOW_EFUSE_RD_DIS
bool rd_dis_now = true;
#ifdef CONFIG_SECURE_FLASH_ENC_ENABLED
/* If flash encryption is not enabled yet then don't read-disable efuses yet, do it later in the boot
when Flash Encryption is being enabled */
rd_dis_now = esp_flash_encryption_enabled();
#endif
if (rd_dis_now) {
ESP_LOGI(TAG, "Prevent read disabling of additional efuses...");
esp_efuse_write_field_bit(ESP_EFUSE_WR_DIS_RD_DIS);
}
#else
ESP_LOGW(TAG, "Allowing read disabling of additional efuses - SECURITY COMPROMISED");
#endif
return ESP_OK;
}