fix(mbedtls): move interrupt allocation during initialization phase

components/esp-tls/test_apps/main/app_main.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2021-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -7,6 +7,7 @@
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "unity.h"
+#include "mbedtls/aes.h"
 #include "memory_checks.h"
 #include "soc/soc_caps.h"
 #if SOC_SHA_SUPPORT_PARALLEL_ENG
@@ -26,13 +27,21 @@
 /* setUp runs before every test */
 void setUp(void)
 {
-    // Execute esp_sha operation to allocate internal SHA semaphore memory
-    // which is considered as leaked otherwise
+    // Execute esp_sha operation to allocate internal SHA semaphore (in case of ESP32)
+    // and initial DMA setup memory which is considered as leaked otherwise
 #if SOC_SHA_SUPPORTED
     const uint8_t input_buffer[64] = {0};
     uint8_t output_buffer[64];
     esp_sha(SHA_TYPE, input_buffer, sizeof(input_buffer), output_buffer);
 #endif // SOC_SHA_SUPPORTED
+
+    // Execute mbedtls_aes_init operation to allocate AES interrupt
+    // allocation memory which is considered as leak otherwise
+#if SOC_AES_SUPPORTED
+    mbedtls_aes_context ctx;
+    mbedtls_aes_init(&ctx);
+#endif // SOC_AES_SUPPORTED
+
     test_utils_record_free_mem();
     TEST_ESP_OK(test_utils_set_leak_level(0, ESP_LEAK_TYPE_CRITICAL, ESP_COMP_LEAK_GENERAL));
     TEST_ESP_OK(test_utils_set_leak_level(0, ESP_LEAK_TYPE_WARNING, ESP_COMP_LEAK_GENERAL));

components/mbedtls/port/aes/dma/esp_aes.c

@@ -177,24 +177,31 @@ static IRAM_ATTR void esp_aes_complete_isr(void *arg)
     }
 }
 
-static esp_err_t esp_aes_isr_initialise( void )
+void esp_aes_intr_alloc(void)
 {
-    aes_hal_interrupt_clear();
-    aes_hal_interrupt_enable(true);
     if (op_complete_sem == NULL) {
-        op_complete_sem = xSemaphoreCreateBinary();
-
-        if (op_complete_sem == NULL) {
-            ESP_LOGE(TAG, "Failed to create intr semaphore");
-            return ESP_FAIL;
-        }
         const int isr_flags = esp_intr_level_to_flags(CONFIG_MBEDTLS_AES_INTERRUPT_LEVEL);
 
         esp_err_t ret = esp_intr_alloc(ETS_AES_INTR_SOURCE, isr_flags, esp_aes_complete_isr, NULL, NULL);
         if (ret != ESP_OK) {
-            return ret;
+            ESP_LOGE(TAG, "Failed to allocate AES interrupt %d", ret);
+            // This should be treated as fatal error as this API would mostly
+            // be invoked within mbedTLS interface. There is no way for the system
+            // to proceed if the AES interrupt allocation fails here.
+            abort();
         }
+
+        static StaticSemaphore_t op_sem_buf;
+        op_complete_sem = xSemaphoreCreateBinaryStatic(&op_sem_buf);
+        // Static semaphore creation is unlikley to fail but still basic sanity
+        assert(op_complete_sem != NULL);
     }
+}
+
+static esp_err_t esp_aes_isr_initialise( void )
+{
+    aes_hal_interrupt_clear();
+    aes_hal_interrupt_enable(true);
 
     /* AES is clocked proportionally to CPU clock, take power management lock */
 #ifdef CONFIG_PM_ENABLE
@@ -433,7 +440,7 @@ static int esp_aes_process_dma(esp_aes_context *ctx, const unsigned char *input,
     /* Only use interrupt for long AES operations */
     if (len > AES_DMA_INTR_TRIG_LEN) {
         use_intr = true;
-        if (esp_aes_isr_initialise() == ESP_FAIL) {
+        if (esp_aes_isr_initialise() != ESP_OK) {
             ESP_LOGE(TAG, "ESP-AES ISR initialisation failed");
             ret = -1;
             goto cleanup;
@@ -576,7 +583,7 @@ int esp_aes_process_dma_gcm(esp_aes_context *ctx, const unsigned char *input, un
     /* Only use interrupt for long AES operations */
     if (len > AES_DMA_INTR_TRIG_LEN) {
         use_intr = true;
-        if (esp_aes_isr_initialise() == ESP_FAIL) {
+        if (esp_aes_isr_initialise() != ESP_OK) {
             ESP_LOGE(TAG, "ESP-AES ISR initialisation failed");
             ret = -1;
             goto cleanup;

components/mbedtls/port/aes/dma/include/esp_aes_dma_priv.h

@@ -1,16 +1,8 @@
-// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
+/*
+ * SPDX-FileCopyrightText: 2020-2023 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 
 #pragma once
 
@@ -43,6 +35,11 @@ esp_err_t esp_aes_dma_start(const lldesc_t *input, const lldesc_t *output);
  */
 bool esp_aes_dma_done(const lldesc_t *output);
 
+/**
+ * @brief Allocate AES peripheral interrupt handler
+ */
+void esp_aes_intr_alloc(void);
+
 #ifdef __cplusplus
 }
 #endif

components/mbedtls/port/aes/esp_aes_common.c

@@ -6,7 +6,7 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  *
- * SPDX-FileContributor: 2016-2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileContributor: 2016-2023 Espressif Systems (Shanghai) CO LTD
  */
 /*
  *  The AES block cipher was designed by Vincent Rijmen and Joan Daemen.
@@ -14,6 +14,7 @@
  *  http://csrc.nist.gov/encryption/aes/rijndael/Rijndael.pdf
  *  http://csrc.nist.gov/publications/fips/fips197/fips-197.pdf
  */
+#include "sdkconfig.h"
 #include "aes/esp_aes_internal.h"
 #include "mbedtls/aes.h"
 #include "hal/aes_hal.h"
@@ -24,7 +25,7 @@
 #include <string.h>
 #include "mbedtls/platform.h"
 
-#if SOC_AES_GDMA
+#if SOC_AES_SUPPORT_DMA
 #include "esp_aes_dma_priv.h"
 #endif
 
@@ -39,10 +40,12 @@ bool valid_key_length(const esp_aes_context *ctx)
     return valid_len;
 }
 
-
-void esp_aes_init( esp_aes_context *ctx )
+void esp_aes_init(esp_aes_context *ctx)
 {
-    bzero( ctx, sizeof( esp_aes_context ) );
+    bzero(ctx, sizeof(esp_aes_context));
+#if SOC_AES_SUPPORT_DMA && CONFIG_MBEDTLS_AES_USE_INTERRUPT
+    esp_aes_intr_alloc();
+#endif
 }
 
 void esp_aes_free( esp_aes_context *ctx )

components/mbedtls/port/bignum/esp_bignum.c

@@ -78,8 +78,8 @@ static esp_err_t esp_mpi_isr_initialise(void)
     mpi_hal_clear_interrupt();
     mpi_hal_interrupt_enable(true);
     if (op_complete_sem == NULL) {
-        op_complete_sem = xSemaphoreCreateBinary();
-
+        static StaticSemaphore_t op_sem_buf;
+        op_complete_sem = xSemaphoreCreateBinaryStatic(&op_sem_buf);
         if (op_complete_sem == NULL) {
             ESP_LOGE(TAG, "Failed to create intr semaphore");
             return ESP_FAIL;
@@ -87,7 +87,16 @@ static esp_err_t esp_mpi_isr_initialise(void)
 
         const int isr_flags = esp_intr_level_to_flags(CONFIG_MBEDTLS_MPI_INTERRUPT_LEVEL);
 
-        esp_intr_alloc(ETS_RSA_INTR_SOURCE, isr_flags, esp_mpi_complete_isr, NULL, NULL);
+        esp_err_t ret;
+        ret = esp_intr_alloc(ETS_RSA_INTR_SOURCE, isr_flags, esp_mpi_complete_isr, NULL, NULL);
+        if (ret != ESP_OK) {
+            ESP_LOGE(TAG, "Failed to allocate RSA interrupt %d", ret);
+
+            // This should be treated as fatal error as this API would mostly
+            // be invoked within mbedTLS interface. There is no way for the system
+            // to proceed if the MPI interrupt allocation fails here.
+            abort();
+        }
     }
 
     /* MPI is clocked proportionally to CPU clock, take power management lock */
@@ -400,7 +409,7 @@ static int esp_mpi_exp_mod( mbedtls_mpi *Z, const mbedtls_mpi *X, const mbedtls_
     esp_mpi_enable_hardware_hw_op();
 
 #if defined (CONFIG_MBEDTLS_MPI_USE_INTERRUPT)
-    if (esp_mpi_isr_initialise() == ESP_FAIL) {
+    if (esp_mpi_isr_initialise() != ESP_OK) {
         ret = -1;
         esp_mpi_disable_hardware_hw_op();
         goto cleanup;

components/mbedtls/test_apps/main/app_main.c

@@ -1,16 +1,25 @@
 /*
- * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "unity.h"
+#include "mbedtls/aes.h"
 #include "memory_checks.h"
+#include "soc/soc_caps.h"
 
 /* setUp runs before every test */
 void setUp(void)
 {
+    // Execute mbedtls_aes_init operation to allocate AES interrupt
+    // allocation memory which is considered as leak otherwise
+#if SOC_AES_SUPPORTED
+    mbedtls_aes_context ctx;
+    mbedtls_aes_init(&ctx);
+#endif // SOC_AES_SUPPORTED
+
     test_utils_record_free_mem();
     test_utils_set_leak_level(CONFIG_UNITY_CRITICAL_LEAK_LEVEL_GENERAL, ESP_LEAK_TYPE_CRITICAL, ESP_COMP_LEAK_GENERAL);
     test_utils_set_leak_level(CONFIG_UNITY_WARN_LEAK_LEVEL_GENERAL, ESP_LEAK_TYPE_WARNING, ESP_COMP_LEAK_GENERAL);

tools/ci/check_copyright_ignore.txt

@@ -561,7 +561,6 @@ components/mbedtls/esp_crt_bundle/test_gen_crt_bundle/test_gen_crt_bundle.py
 components/mbedtls/port/aes/block/esp_aes.c
 components/mbedtls/port/aes/dma/esp_aes.c
 components/mbedtls/port/aes/dma/esp_aes_crypto_dma_impl.c
-components/mbedtls/port/aes/dma/include/esp_aes_dma_priv.h
 components/mbedtls/port/aes/esp_aes_xts.c
 components/mbedtls/port/include/aes/esp_aes.h
 components/mbedtls/port/include/aes/esp_aes_internal.h