memory_buffer_alloc.c

00001 /*
00002  *  Buffer-based memory allocator
00003  *
00004  *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
00005  *
00006  *  This file is part of mbed TLS (https://tls.mbed.org)
00007  *
00008  *  This program is free software; you can redistribute it and/or modify
00009  *  it under the terms of the GNU General Public License as published by
00010  *  the Free Software Foundation; either version 2 of the License, or
00011  *  (at your option) any later version.
00012  *
00013  *  This program is distributed in the hope that it will be useful,
00014  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00016  *  GNU General Public License for more details.
00017  *
00018  *  You should have received a copy of the GNU General Public License along
00019  *  with this program; if not, write to the Free Software Foundation, Inc.,
00020  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
00021  */
00022 
00023 #if !defined(POLARSSL_CONFIG_FILE)
00024 #include "polarssl/config.h"
00025 #else
00026 #include POLARSSL_CONFIG_FILE
00027 #endif
00028 
00029 #if defined(POLARSSL_MEMORY_BUFFER_ALLOC_C)
00030 #include "polarssl/memory_buffer_alloc.h"
00031 
00032 /* No need for the header guard as POLARSSL_MEMORY_BUFFER_ALLOC_C
00033    is dependent upon POLARSSL_PLATFORM_C */
00034 #include "polarssl/platform.h"
00035 
00036 #include <string.h>
00037 
00038 #if defined(POLARSSL_MEMORY_BACKTRACE)
00039 #include <execinfo.h>
00040 #endif
00041 
00042 #if defined(POLARSSL_THREADING_C)
00043 #include "polarssl/threading.h"
00044 #endif
00045 
00046 /* Implementation that should never be optimized out by the compiler */
00047 static void polarssl_zeroize( void *v, size_t n ) {
00048     volatile unsigned char *p = v; while( n-- ) *p++ = 0;
00049 }
00050 
00051 #define MAGIC1       0xFF00AA55
00052 #define MAGIC2       0xEE119966
00053 #define MAX_BT 20
00054 
00055 typedef struct _memory_header memory_header;
00056 struct _memory_header
00057 {
00058     size_t          magic1;
00059     size_t          size;
00060     size_t          alloc;
00061     memory_header   *prev;
00062     memory_header   *next;
00063     memory_header   *prev_free;
00064     memory_header   *next_free;
00065 #if defined(POLARSSL_MEMORY_BACKTRACE)
00066     char            **trace;
00067     size_t          trace_count;
00068 #endif
00069     size_t          magic2;
00070 };
00071 
00072 typedef struct
00073 {
00074     unsigned char   *buf;
00075     size_t          len;
00076     memory_header   *first;
00077     memory_header   *first_free;
00078     int             verify;
00079 #if defined(POLARSSL_MEMORY_DEBUG)
00080     size_t          malloc_count;
00081     size_t          free_count;
00082     size_t          total_used;
00083     size_t          maximum_used;
00084     size_t          header_count;
00085     size_t          maximum_header_count;
00086 #endif
00087 #if defined(POLARSSL_THREADING_C)
00088     threading_mutex_t   mutex;
00089 #endif
00090 }
00091 buffer_alloc_ctx;
00092 
00093 static buffer_alloc_ctx heap;
00094 
00095 #if defined(POLARSSL_MEMORY_DEBUG)
00096 static void debug_header( memory_header *hdr )
00097 {
00098 #if defined(POLARSSL_MEMORY_BACKTRACE)
00099     size_t i;
00100 #endif
00101 
00102     polarssl_fprintf( stderr, "HDR:  PTR(%10zu), PREV(%10zu), NEXT(%10zu), "
00103                               "ALLOC(%zu), SIZE(%10zu)\n",
00104                       (size_t) hdr, (size_t) hdr->prev, (size_t) hdr->next,
00105                       hdr->alloc, hdr->size );
00106     polarssl_fprintf( stderr, "      FPREV(%10zu), FNEXT(%10zu)\n",
00107                       (size_t) hdr->prev_free, (size_t) hdr->next_free );
00108 
00109 #if defined(POLARSSL_MEMORY_BACKTRACE)
00110     polarssl_fprintf( stderr, "TRACE: \n" );
00111     for( i = 0; i < hdr->trace_count; i++ )
00112         polarssl_fprintf( stderr, "%s\n", hdr->trace[i] );
00113     polarssl_fprintf( stderr, "\n" );
00114 #endif
00115 }
00116 
00117 static void debug_chain()
00118 {
00119     memory_header *cur = heap.first;
00120 
00121     polarssl_fprintf( stderr, "\nBlock list\n" );
00122     while( cur != NULL )
00123     {
00124         debug_header( cur );
00125         cur = cur->next;
00126     }
00127 
00128     polarssl_fprintf( stderr, "Free list\n" );
00129     cur = heap.first_free;
00130 
00131     while( cur != NULL )
00132     {
00133         debug_header( cur );
00134         cur = cur->next_free;
00135     }
00136 }
00137 #endif /* POLARSSL_MEMORY_DEBUG */
00138 
00139 static int verify_header( memory_header *hdr )
00140 {
00141     if( hdr->magic1 != MAGIC1 )
00142     {
00143 #if defined(POLARSSL_MEMORY_DEBUG)
00144         polarssl_fprintf( stderr, "FATAL: MAGIC1 mismatch\n" );
00145 #endif
00146         return( 1 );
00147     }
00148 
00149     if( hdr->magic2 != MAGIC2 )
00150     {
00151 #if defined(POLARSSL_MEMORY_DEBUG)
00152         polarssl_fprintf( stderr, "FATAL: MAGIC2 mismatch\n" );
00153 #endif
00154         return( 1 );
00155     }
00156 
00157     if( hdr->alloc > 1 )
00158     {
00159 #if defined(POLARSSL_MEMORY_DEBUG)
00160         polarssl_fprintf( stderr, "FATAL: alloc has illegal value\n" );
00161 #endif
00162         return( 1 );
00163     }
00164 
00165     if( hdr->prev != NULL && hdr->prev == hdr->next )
00166     {
00167 #if defined(POLARSSL_MEMORY_DEBUG)
00168         polarssl_fprintf( stderr, "FATAL: prev == next\n" );
00169 #endif
00170         return( 1 );
00171     }
00172 
00173     if( hdr->prev_free != NULL && hdr->prev_free == hdr->next_free )
00174     {
00175 #if defined(POLARSSL_MEMORY_DEBUG)
00176         polarssl_fprintf( stderr, "FATAL: prev_free == next_free\n" );
00177 #endif
00178         return( 1 );
00179     }
00180 
00181     return( 0 );
00182 }
00183 
00184 static int verify_chain()
00185 {
00186     memory_header *prv = heap.first, *cur = heap.first->next;
00187 
00188     if( verify_header( heap.first ) != 0 )
00189     {
00190 #if defined(POLARSSL_MEMORY_DEBUG)
00191         polarssl_fprintf( stderr, "FATAL: verification of first header "
00192                                   "failed\n" );
00193 #endif
00194         return( 1 );
00195     }
00196 
00197     if( heap.first->prev != NULL )
00198     {
00199 #if defined(POLARSSL_MEMORY_DEBUG)
00200         polarssl_fprintf( stderr, "FATAL: verification failed: "
00201                                   "first->prev != NULL\n" );
00202 #endif
00203         return( 1 );
00204     }
00205 
00206     while( cur != NULL )
00207     {
00208         if( verify_header( cur ) != 0 )
00209         {
00210 #if defined(POLARSSL_MEMORY_DEBUG)
00211             polarssl_fprintf( stderr, "FATAL: verification of header "
00212                                       "failed\n" );
00213 #endif
00214             return( 1 );
00215         }
00216 
00217         if( cur->prev != prv )
00218         {
00219 #if defined(POLARSSL_MEMORY_DEBUG)
00220             polarssl_fprintf( stderr, "FATAL: verification failed: "
00221                                       "cur->prev != prv\n" );
00222 #endif
00223             return( 1 );
00224         }
00225 
00226         prv = cur;
00227         cur = cur->next;
00228     }
00229 
00230     return( 0 );
00231 }
00232 
00233 static void *buffer_alloc_malloc( size_t len )
00234 {
00235     memory_header *new, *cur = heap.first_free;
00236     unsigned char *p;
00237 #if defined(POLARSSL_MEMORY_BACKTRACE)
00238     void *trace_buffer[MAX_BT];
00239     size_t trace_cnt;
00240 #endif
00241 
00242     if( heap.buf == NULL || heap.first == NULL )
00243         return( NULL );
00244 
00245     if( len % POLARSSL_MEMORY_ALIGN_MULTIPLE )
00246     {
00247         len -= len % POLARSSL_MEMORY_ALIGN_MULTIPLE;
00248         len += POLARSSL_MEMORY_ALIGN_MULTIPLE;
00249     }
00250 
00251     // Find block that fits
00252     //
00253     while( cur != NULL )
00254     {
00255         if( cur->size >= len )
00256             break;
00257 
00258         cur = cur->next_free;
00259     }
00260 
00261     if( cur == NULL )
00262         return( NULL );
00263 
00264     if( cur->alloc != 0 )
00265     {
00266 #if defined(POLARSSL_MEMORY_DEBUG)
00267         polarssl_fprintf( stderr, "FATAL: block in free_list but allocated "
00268                                   "data\n" );
00269 #endif
00270         polarssl_exit( 1 );
00271     }
00272 
00273 #if defined(POLARSSL_MEMORY_DEBUG)
00274     heap.malloc_count++;
00275 #endif
00276 
00277     // Found location, split block if > memory_header + 4 room left
00278     //
00279     if( cur->size - len < sizeof(memory_header) +
00280                           POLARSSL_MEMORY_ALIGN_MULTIPLE )
00281     {
00282         cur->alloc = 1;
00283 
00284         // Remove from free_list
00285         //
00286         if( cur->prev_free != NULL )
00287             cur->prev_free->next_free = cur->next_free;
00288         else
00289             heap.first_free = cur->next_free;
00290 
00291         if( cur->next_free != NULL )
00292             cur->next_free->prev_free = cur->prev_free;
00293 
00294         cur->prev_free = NULL;
00295         cur->next_free = NULL;
00296 
00297 #if defined(POLARSSL_MEMORY_DEBUG)
00298         heap.total_used += cur->size;
00299         if( heap.total_used > heap.maximum_used )
00300             heap.maximum_used = heap.total_used;
00301 #endif
00302 #if defined(POLARSSL_MEMORY_BACKTRACE)
00303         trace_cnt = backtrace( trace_buffer, MAX_BT );
00304         cur->trace = backtrace_symbols( trace_buffer, trace_cnt );
00305         cur->trace_count = trace_cnt;
00306 #endif
00307 
00308         if( ( heap.verify & MEMORY_VERIFY_ALLOC ) && verify_chain() != 0 )
00309             polarssl_exit( 1 );
00310 
00311         return( ( (unsigned char *) cur ) + sizeof(memory_header) );
00312     }
00313 
00314     p = ( (unsigned char *) cur ) + sizeof(memory_header) + len;
00315     new = (memory_header *) p;
00316 
00317     new->size = cur->size - len - sizeof(memory_header);
00318     new->alloc = 0;
00319     new->prev = cur;
00320     new->next = cur->next;
00321 #if defined(POLARSSL_MEMORY_BACKTRACE)
00322     new->trace = NULL;
00323     new->trace_count = 0;
00324 #endif
00325     new->magic1 = MAGIC1;
00326     new->magic2 = MAGIC2;
00327 
00328     if( new->next != NULL )
00329         new->next->prev = new;
00330 
00331     // Replace cur with new in free_list
00332     //
00333     new->prev_free = cur->prev_free;
00334     new->next_free = cur->next_free;
00335     if( new->prev_free != NULL )
00336         new->prev_free->next_free = new;
00337     else
00338         heap.first_free = new;
00339 
00340     if( new->next_free != NULL )
00341         new->next_free->prev_free = new;
00342 
00343     cur->alloc = 1;
00344     cur->size = len;
00345     cur->next = new;
00346     cur->prev_free = NULL;
00347     cur->next_free = NULL;
00348 
00349 #if defined(POLARSSL_MEMORY_DEBUG)
00350     heap.header_count++;
00351     if( heap.header_count > heap.maximum_header_count )
00352         heap.maximum_header_count = heap.header_count;
00353     heap.total_used += cur->size;
00354     if( heap.total_used > heap.maximum_used )
00355         heap.maximum_used = heap.total_used;
00356 #endif
00357 #if defined(POLARSSL_MEMORY_BACKTRACE)
00358     trace_cnt = backtrace( trace_buffer, MAX_BT );
00359     cur->trace = backtrace_symbols( trace_buffer, trace_cnt );
00360     cur->trace_count = trace_cnt;
00361 #endif
00362 
00363     if( ( heap.verify & MEMORY_VERIFY_ALLOC ) && verify_chain() != 0 )
00364         polarssl_exit( 1 );
00365 
00366     return( ( (unsigned char *) cur ) + sizeof(memory_header) );
00367 }
00368 
00369 static void buffer_alloc_free( void *ptr )
00370 {
00371     memory_header *hdr, *old = NULL;
00372     unsigned char *p = (unsigned char *) ptr;
00373 
00374     if( ptr == NULL || heap.buf == NULL || heap.first == NULL )
00375         return;
00376 
00377     if( p < heap.buf || p > heap.buf + heap.len )
00378     {
00379 #if defined(POLARSSL_MEMORY_DEBUG)
00380         polarssl_fprintf( stderr, "FATAL: polarssl_free() outside of managed "
00381                                   "space\n" );
00382 #endif
00383         polarssl_exit( 1 );
00384     }
00385 
00386     p -= sizeof(memory_header);
00387     hdr = (memory_header *) p;
00388 
00389     if( verify_header( hdr ) != 0 )
00390         polarssl_exit( 1 );
00391 
00392     if( hdr->alloc != 1 )
00393     {
00394 #if defined(POLARSSL_MEMORY_DEBUG)
00395         polarssl_fprintf( stderr, "FATAL: polarssl_free() on unallocated "
00396                                   "data\n" );
00397 #endif
00398         polarssl_exit( 1 );
00399     }
00400 
00401     hdr->alloc = 0;
00402 
00403 #if defined(POLARSSL_MEMORY_DEBUG)
00404     heap.free_count++;
00405     heap.total_used -= hdr->size;
00406 #endif
00407 
00408     // Regroup with block before
00409     //
00410     if( hdr->prev != NULL && hdr->prev->alloc == 0 )
00411     {
00412 #if defined(POLARSSL_MEMORY_DEBUG)
00413         heap.header_count--;
00414 #endif
00415         hdr->prev->size += sizeof(memory_header) + hdr->size;
00416         hdr->prev->next = hdr->next;
00417         old = hdr;
00418         hdr = hdr->prev;
00419 
00420         if( hdr->next != NULL )
00421             hdr->next->prev = hdr;
00422 
00423 #if defined(POLARSSL_MEMORY_BACKTRACE)
00424         free( old->trace );
00425 #endif
00426         memset( old, 0, sizeof(memory_header) );
00427     }
00428 
00429     // Regroup with block after
00430     //
00431     if( hdr->next != NULL && hdr->next->alloc == 0 )
00432     {
00433 #if defined(POLARSSL_MEMORY_DEBUG)
00434         heap.header_count--;
00435 #endif
00436         hdr->size += sizeof(memory_header) + hdr->next->size;
00437         old = hdr->next;
00438         hdr->next = hdr->next->next;
00439 
00440         if( hdr->prev_free != NULL || hdr->next_free != NULL )
00441         {
00442             if( hdr->prev_free != NULL )
00443                 hdr->prev_free->next_free = hdr->next_free;
00444             else
00445                 heap.first_free = hdr->next_free;
00446 
00447             if( hdr->next_free != NULL )
00448                 hdr->next_free->prev_free = hdr->prev_free;
00449         }
00450 
00451         hdr->prev_free = old->prev_free;
00452         hdr->next_free = old->next_free;
00453 
00454         if( hdr->prev_free != NULL )
00455             hdr->prev_free->next_free = hdr;
00456         else
00457             heap.first_free = hdr;
00458 
00459         if( hdr->next_free != NULL )
00460             hdr->next_free->prev_free = hdr;
00461 
00462         if( hdr->next != NULL )
00463             hdr->next->prev = hdr;
00464 
00465 #if defined(POLARSSL_MEMORY_BACKTRACE)
00466         free( old->trace );
00467 #endif
00468         memset( old, 0, sizeof(memory_header) );
00469     }
00470 
00471     // Prepend to free_list if we have not merged
00472     // (Does not have to stay in same order as prev / next list)
00473     //
00474     if( old == NULL )
00475     {
00476         hdr->next_free = heap.first_free;
00477         if( heap.first_free != NULL )
00478             heap.first_free->prev_free = hdr;
00479         heap.first_free = hdr;
00480     }
00481 
00482 #if defined(POLARSSL_MEMORY_BACKTRACE)
00483     hdr->trace = NULL;
00484     hdr->trace_count = 0;
00485 #endif
00486 
00487     if( ( heap.verify & MEMORY_VERIFY_FREE ) && verify_chain() != 0 )
00488         polarssl_exit( 1 );
00489 }
00490 
00491 void memory_buffer_set_verify( int verify )
00492 {
00493     heap.verify = verify;
00494 }
00495 
00496 int memory_buffer_alloc_verify()
00497 {
00498     return verify_chain();
00499 }
00500 
00501 #if defined(POLARSSL_MEMORY_DEBUG)
00502 void memory_buffer_alloc_status()
00503 {
00504     polarssl_fprintf( stderr,
00505                       "Current use: %zu blocks / %zu bytes, max: %zu blocks / "
00506                       "%zu bytes (total %zu bytes), malloc / free: %zu / %zu\n",
00507                       heap.header_count, heap.total_used,
00508                       heap.maximum_header_count, heap.maximum_used,
00509                       heap.maximum_header_count * sizeof( memory_header )
00510                       + heap.maximum_used,
00511                       heap.malloc_count, heap.free_count );
00512 
00513     if( heap.first->next == NULL )
00514         polarssl_fprintf( stderr, "All memory de-allocated in stack buffer\n" );
00515     else
00516     {
00517         polarssl_fprintf( stderr, "Memory currently allocated:\n" );
00518         debug_chain();
00519     }
00520 }
00521 
00522 void memory_buffer_alloc_max_get( size_t *max_used, size_t *max_blocks )
00523 {
00524     *max_used   = heap.maximum_used;
00525     *max_blocks = heap.maximum_header_count;
00526 }
00527 
00528 void memory_buffer_alloc_max_reset( void )
00529 {
00530     heap.maximum_used = 0;
00531     heap.maximum_header_count = 0;
00532 }
00533 
00534 void memory_buffer_alloc_cur_get( size_t *cur_used, size_t *cur_blocks )
00535 {
00536     *cur_used   = heap.total_used;
00537     *cur_blocks = heap.header_count;
00538 }
00539 #endif /* POLARSSL_MEMORY_DEBUG */
00540 
00541 #if defined(POLARSSL_THREADING_C)
00542 static void *buffer_alloc_malloc_mutexed( size_t len )
00543 {
00544     void *buf;
00545     polarssl_mutex_lock( &heap.mutex );
00546     buf = buffer_alloc_malloc( len );
00547     polarssl_mutex_unlock( &heap.mutex );
00548     return( buf );
00549 }
00550 
00551 static void buffer_alloc_free_mutexed( void *ptr )
00552 {
00553     polarssl_mutex_lock( &heap.mutex );
00554     buffer_alloc_free( ptr );
00555     polarssl_mutex_unlock( &heap.mutex );
00556 }
00557 #endif /* POLARSSL_THREADING_C */
00558 
00559 int memory_buffer_alloc_init( unsigned char *buf, size_t len )
00560 {
00561     memset( &heap, 0, sizeof(buffer_alloc_ctx) );
00562     memset( buf, 0, len );
00563 
00564 #if defined(POLARSSL_THREADING_C)
00565     polarssl_mutex_init( &heap.mutex );
00566     platform_set_malloc_free( buffer_alloc_malloc_mutexed,
00567                               buffer_alloc_free_mutexed );
00568 #else
00569     platform_set_malloc_free( buffer_alloc_malloc, buffer_alloc_free );
00570 #endif
00571 
00572     if( (size_t) buf % POLARSSL_MEMORY_ALIGN_MULTIPLE )
00573     {
00574         /* Adjust len first since buf is used in the computation */
00575         len -= POLARSSL_MEMORY_ALIGN_MULTIPLE
00576              - (size_t) buf % POLARSSL_MEMORY_ALIGN_MULTIPLE;
00577         buf += POLARSSL_MEMORY_ALIGN_MULTIPLE
00578              - (size_t) buf % POLARSSL_MEMORY_ALIGN_MULTIPLE;
00579     }
00580 
00581     heap.buf = buf;
00582     heap.len = len;
00583 
00584     heap.first = (memory_header *) buf;
00585     heap.first->size = len - sizeof(memory_header);
00586     heap.first->magic1 = MAGIC1;
00587     heap.first->magic2 = MAGIC2;
00588     heap.first_free = heap.first;
00589     return( 0 );
00590 }
00591 
00592 void memory_buffer_alloc_free()
00593 {
00594 #if defined(POLARSSL_THREADING_C)
00595     polarssl_mutex_free( &heap.mutex );
00596 #endif
00597     polarssl_zeroize( &heap, sizeof(buffer_alloc_ctx) );
00598 }
00599 
00600 #if defined(POLARSSL_SELF_TEST)
00601 static int check_pointer( void *p )
00602 {
00603     if( p == NULL )
00604         return( -1 );
00605 
00606     if( (size_t) p % POLARSSL_MEMORY_ALIGN_MULTIPLE != 0 )
00607         return( -1 );
00608 
00609     return( 0 );
00610 }
00611 
00612 static int check_all_free( )
00613 {
00614     if(
00615 #if defined(POLARSSL_MEMORY_DEBUG)
00616         heap.total_used != 0 ||
00617 #endif
00618         heap.first != heap.first_free ||
00619         (void *) heap.first != (void *) heap.buf )
00620     {
00621         return( -1 );
00622     }
00623 
00624     return( 0 );
00625 }
00626 
00627 #define TEST_ASSERT( condition )            \
00628     if( ! (condition) )                     \
00629     {                                       \
00630         if( verbose != 0 )                  \
00631             polarssl_printf( "failed\n" );  \
00632                                             \
00633         ret = 1;                            \
00634         goto cleanup;                       \
00635     }
00636 
00637 int memory_buffer_alloc_self_test( int verbose )
00638 {
00639     unsigned char buf[1024];
00640     unsigned char *p, *q, *r, *end;
00641     int ret = 0;
00642 
00643     if( verbose != 0 )
00644         polarssl_printf( "  MBA test #1 (basic alloc-free cycle): " );
00645 
00646     memory_buffer_alloc_init( buf, sizeof( buf ) );
00647 
00648     p = polarssl_malloc( 1 );
00649     q = polarssl_malloc( 128 );
00650     r = polarssl_malloc( 16 );
00651 
00652     TEST_ASSERT( check_pointer( p ) == 0 &&
00653                  check_pointer( q ) == 0 &&
00654                  check_pointer( r ) == 0 );
00655 
00656     polarssl_free( r );
00657     polarssl_free( q );
00658     polarssl_free( p );
00659 
00660     TEST_ASSERT( check_all_free( ) == 0 );
00661 
00662     /* Memorize end to compare with the next test */
00663     end = heap.buf + heap.len;
00664 
00665     memory_buffer_alloc_free( );
00666 
00667     if( verbose != 0 )
00668         polarssl_printf( "passed\n" );
00669 
00670     if( verbose != 0 )
00671         polarssl_printf( "  MBA test #2 (buf not aligned): " );
00672 
00673     memory_buffer_alloc_init( buf + 1, sizeof( buf ) - 1 );
00674 
00675     TEST_ASSERT( heap.buf + heap.len == end );
00676 
00677     p = polarssl_malloc( 1 );
00678     q = polarssl_malloc( 128 );
00679     r = polarssl_malloc( 16 );
00680 
00681     TEST_ASSERT( check_pointer( p ) == 0 &&
00682                  check_pointer( q ) == 0 &&
00683                  check_pointer( r ) == 0 );
00684 
00685     polarssl_free( r );
00686     polarssl_free( q );
00687     polarssl_free( p );
00688 
00689     TEST_ASSERT( check_all_free( ) == 0 );
00690 
00691     memory_buffer_alloc_free( );
00692 
00693     if( verbose != 0 )
00694         polarssl_printf( "passed\n" );
00695 
00696     if( verbose != 0 )
00697         polarssl_printf( "  MBA test #3 (full): " );
00698 
00699     memory_buffer_alloc_init( buf, sizeof( buf ) );
00700 
00701     p = polarssl_malloc( sizeof( buf ) - sizeof( memory_header ) );
00702 
00703     TEST_ASSERT( check_pointer( p ) == 0 );
00704     TEST_ASSERT( polarssl_malloc( 1 ) == NULL );
00705 
00706     polarssl_free( p );
00707 
00708     p = polarssl_malloc( sizeof( buf ) - 2 * sizeof( memory_header ) - 16 );
00709     q = polarssl_malloc( 16 );
00710 
00711     TEST_ASSERT( check_pointer( p ) == 0 && check_pointer( q ) == 0 );
00712     TEST_ASSERT( polarssl_malloc( 1 ) == NULL );
00713 
00714     polarssl_free( q );
00715 
00716     TEST_ASSERT( polarssl_malloc( 17 ) == NULL );
00717 
00718     polarssl_free( p );
00719 
00720     TEST_ASSERT( check_all_free( ) == 0 );
00721 
00722     memory_buffer_alloc_free( );
00723 
00724     if( verbose != 0 )
00725         polarssl_printf( "passed\n" );
00726 
00727 cleanup:
00728     memory_buffer_alloc_free( );
00729 
00730     return( ret );
00731 }
00732 #endif /* POLARSSL_SELF_TEST */
00733 
00734 #endif /* POLARSSL_MEMORY_BUFFER_ALLOC_C */
00735