1 /**
2  * \file memory_buffer_alloc.h
3  *
4  * \brief Buffer-based memory allocator
5  */
6 /*
7  *  Copyright The Mbed TLS Contributors
8  *  SPDX-License-Identifier: Apache-2.0
9  *
10  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
11  *  not use this file except in compliance with the License.
12  *  You may obtain a copy of the License at
13  *
14  *  http://www.apache.org/licenses/LICENSE-2.0
15  *
16  *  Unless required by applicable law or agreed to in writing, software
17  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19  *  See the License for the specific language governing permissions and
20  *  limitations under the License.
21  */
22 #ifndef MBEDTLS_MEMORY_BUFFER_ALLOC_H
23 #define MBEDTLS_MEMORY_BUFFER_ALLOC_H
24 
25 #include "mbedtls/build_info.h"
26 
27 #include <stddef.h>
28 
29 /**
30  * \name SECTION: Module settings
31  *
32  * The configuration options you can set for this module are in this section.
33  * Either change them in mbedtls_config.h or define them on the compiler command line.
34  * \{
35  */
36 
37 #if !defined(MBEDTLS_MEMORY_ALIGN_MULTIPLE)
38 #define MBEDTLS_MEMORY_ALIGN_MULTIPLE       4 /**< Align on multiples of this value */
39 #endif
40 
41 /* \} name SECTION: Module settings */
42 
43 #define MBEDTLS_MEMORY_VERIFY_NONE         0
44 #define MBEDTLS_MEMORY_VERIFY_ALLOC        (1 << 0)
45 #define MBEDTLS_MEMORY_VERIFY_FREE         (1 << 1)
46 #define MBEDTLS_MEMORY_VERIFY_ALWAYS       (MBEDTLS_MEMORY_VERIFY_ALLOC | MBEDTLS_MEMORY_VERIFY_FREE)
47 
48 #ifdef __cplusplus
49 extern "C" {
50 #endif
51 
52 /**
53  * \brief   Initialize use of stack-based memory allocator.
54  *          The stack-based allocator does memory management inside the
55  *          presented buffer and does not call calloc() and free().
56  *          It sets the global mbedtls_calloc() and mbedtls_free() pointers
57  *          to its own functions.
58  *          (Provided mbedtls_calloc() and mbedtls_free() are thread-safe if
59  *           MBEDTLS_THREADING_C is defined)
60  *
61  * \note    This code is not optimized and provides a straight-forward
62  *          implementation of a stack-based memory allocator.
63  *
64  * \param buf   buffer to use as heap
65  * \param len   size of the buffer
66  */
67 void mbedtls_memory_buffer_alloc_init( unsigned char *buf, size_t len );
68 
69 /**
70  * \brief   Free the mutex for thread-safety and clear remaining memory
71  */
72 void mbedtls_memory_buffer_alloc_free( void );
73 
74 /**
75  * \brief   Determine when the allocator should automatically verify the state
76  *          of the entire chain of headers / meta-data.
77  *          (Default: MBEDTLS_MEMORY_VERIFY_NONE)
78  *
79  * \param verify    One of MBEDTLS_MEMORY_VERIFY_NONE, MBEDTLS_MEMORY_VERIFY_ALLOC,
80  *                  MBEDTLS_MEMORY_VERIFY_FREE or MBEDTLS_MEMORY_VERIFY_ALWAYS
81  */
82 void mbedtls_memory_buffer_set_verify( int verify );
83 
84 #if defined(MBEDTLS_MEMORY_DEBUG)
85 /**
86  * \brief   Print out the status of the allocated memory (primarily for use
87  *          after a program should have de-allocated all memory)
88  *          Prints out a list of 'still allocated' blocks and their stack
89  *          trace if MBEDTLS_MEMORY_BACKTRACE is defined.
90  */
91 void mbedtls_memory_buffer_alloc_status( void );
92 
93 /**
94  * \brief   Get the peak heap usage so far
95  *
96  * \param max_used      Peak number of bytes in use or committed. This
97  *                      includes bytes in allocated blocks too small to split
98  *                      into smaller blocks but larger than the requested size.
99  * \param max_blocks    Peak number of blocks in use, including free and used
100  */
101 void mbedtls_memory_buffer_alloc_max_get( size_t *max_used, size_t *max_blocks );
102 
103 /**
104  * \brief   Reset peak statistics
105  */
106 void mbedtls_memory_buffer_alloc_max_reset( void );
107 
108 /**
109  * \brief   Get the current heap usage
110  *
111  * \param cur_used      Current number of bytes in use or committed. This
112  *                      includes bytes in allocated blocks too small to split
113  *                      into smaller blocks but larger than the requested size.
114  * \param cur_blocks    Current number of blocks in use, including free and used
115  */
116 void mbedtls_memory_buffer_alloc_cur_get( size_t *cur_used, size_t *cur_blocks );
117 #endif /* MBEDTLS_MEMORY_DEBUG */
118 
119 /**
120  * \brief   Verifies that all headers in the memory buffer are correct
121  *          and contain sane values. Helps debug buffer-overflow errors.
122  *
123  *          Prints out first failure if MBEDTLS_MEMORY_DEBUG is defined.
124  *          Prints out full header information if MBEDTLS_MEMORY_DEBUG
125  *          is defined. (Includes stack trace information for each block if
126  *          MBEDTLS_MEMORY_BACKTRACE is defined as well).
127  *
128  * \return             0 if verified, 1 otherwise
129  */
130 int mbedtls_memory_buffer_alloc_verify( void );
131 
132 #if defined(MBEDTLS_SELF_TEST)
133 /**
134  * \brief          Checkup routine
135  *
136  * \return         0 if successful, or 1 if a test failed
137  */
138 int mbedtls_memory_buffer_alloc_self_test( int verbose );
139 #endif
140 
141 #ifdef __cplusplus
142 }
143 #endif
144 
145 #endif /* memory_buffer_alloc.h */
146