Mercurial > dropbear
annotate dbmalloc.c @ 1562:768ebf737aa0 fuzz
merge from main
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 28 Feb 2018 22:11:39 +0800 |
| parents | 7209a6e30932 |
| children | c42e8ff42bd1 |
| rev | line source |
|---|---|
| 1361 | 1 #include "dbmalloc.h" |
| 2 #include "dbutil.h" | |
| 3 | |
| 4 struct dbmalloc_header { | |
| 5 unsigned int epoch; | |
| 1378 | 6 struct dbmalloc_header *prev; |
| 7 struct dbmalloc_header *next; | |
| 1361 | 8 }; |
| 9 | |
| 1378 | 10 static void put_alloc(struct dbmalloc_header *header); |
| 11 static void remove_alloc(struct dbmalloc_header *header); | |
| 12 | |
| 13 /* end of the linked list */ | |
| 14 static struct dbmalloc_header* staple; | |
| 1361 | 15 |
| 16 unsigned int current_epoch = 0; | |
| 17 | |
| 18 void m_malloc_set_epoch(unsigned int epoch) { | |
| 19 current_epoch = epoch; | |
| 20 } | |
| 21 | |
| 1378 | 22 void m_malloc_free_epoch(unsigned int epoch, int dofree) { |
| 23 struct dbmalloc_header* header; | |
| 24 struct dbmalloc_header* nextheader = NULL; | |
| 25 struct dbmalloc_header* oldstaple = staple; | |
| 26 staple = NULL; | |
| 27 /* free allocations from this epoch, create a new staple-anchored list from | |
| 28 the remainder */ | |
| 29 for (header = oldstaple; header; header = nextheader) | |
| 30 { | |
| 31 nextheader = header->next; | |
| 32 if (header->epoch == epoch) { | |
| 33 if (dofree) { | |
| 34 free(header); | |
| 1361 | 35 } |
| 1378 | 36 } else { |
| 37 header->prev = NULL; | |
| 38 header->next = NULL; | |
| 39 put_alloc(header); | |
| 1361 | 40 } |
| 41 } | |
| 42 } | |
| 43 | |
| 44 static void put_alloc(struct dbmalloc_header *header) { | |
| 1378 | 45 assert(header->next == NULL); |
| 46 assert(header->prev == NULL); | |
| 47 if (staple) { | |
| 48 staple->prev = header; | |
| 1361 | 49 } |
| 1378 | 50 header->next = staple; |
| 51 staple = header; | |
| 1361 | 52 } |
| 53 | |
| 54 static void remove_alloc(struct dbmalloc_header *header) { | |
| 1378 | 55 if (header->prev) { |
| 56 header->prev->next = header->next; | |
| 57 } | |
| 58 if (header->next) { | |
| 59 header->next->prev = header->prev; | |
| 60 } | |
| 61 if (staple == header) { | |
| 62 staple = header->next; | |
| 63 } | |
| 64 header->prev = NULL; | |
| 65 header->next = NULL; | |
| 1361 | 66 } |
| 67 | |
| 68 static struct dbmalloc_header* get_header(void* ptr) { | |
| 69 char* bptr = ptr; | |
| 70 return (struct dbmalloc_header*)&bptr[-sizeof(struct dbmalloc_header)]; | |
| 71 } | |
| 72 | |
| 73 void * m_malloc(size_t size) { | |
| 74 char* mem = NULL; | |
| 75 struct dbmalloc_header* header = NULL; | |
| 76 | |
| 77 if (size == 0 || size > 1e9) { | |
| 78 dropbear_exit("m_malloc failed"); | |
| 79 } | |
| 80 | |
| 81 size = size + sizeof(struct dbmalloc_header); | |
| 82 | |
| 83 mem = calloc(1, size); | |
| 84 if (mem == NULL) { | |
| 85 dropbear_exit("m_malloc failed"); | |
| 86 } | |
| 87 header = (struct dbmalloc_header*)mem; | |
| 88 put_alloc(header); | |
| 89 header->epoch = current_epoch; | |
| 90 return &mem[sizeof(struct dbmalloc_header)]; | |
| 91 } | |
| 92 | |
| 93 void * m_calloc(size_t nmemb, size_t size) { | |
|
1365
9aa6cd66b51d
zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents:
1361
diff
changeset
|
94 if (SIZE_T_MAX / nmemb < size) { |
|
9aa6cd66b51d
zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents:
1361
diff
changeset
|
95 dropbear_exit("m_calloc failed"); |
|
9aa6cd66b51d
zlib can use m_malloc/m_free too
Matt Johnston <matt@ucc.asn.au>
parents:
1361
diff
changeset
|
96 } |
| 1361 | 97 return m_malloc(nmemb*size); |
| 98 } | |
| 99 | |
| 100 void * m_realloc(void* ptr, size_t size) { | |
| 101 char* mem = NULL; | |
| 102 struct dbmalloc_header* header = NULL; | |
| 103 if (size == 0 || size > 1e9) { | |
| 104 dropbear_exit("m_realloc failed"); | |
| 105 } | |
| 106 | |
| 107 header = get_header(ptr); | |
| 108 remove_alloc(header); | |
| 109 | |
| 110 size = size + sizeof(struct dbmalloc_header); | |
| 111 mem = realloc(header, size); | |
| 112 if (mem == NULL) { | |
| 113 dropbear_exit("m_realloc failed"); | |
| 114 } | |
| 115 | |
| 116 header = (struct dbmalloc_header*)mem; | |
| 117 put_alloc(header); | |
| 118 return &mem[sizeof(struct dbmalloc_header)]; | |
| 119 } | |
| 120 | |
| 121 void m_free_direct(void* ptr) { | |
| 122 struct dbmalloc_header* header = NULL; | |
| 123 if (!ptr) { | |
| 124 return; | |
| 125 } | |
| 126 header = get_header(ptr); | |
| 127 remove_alloc(header); | |
| 128 free(header); | |
| 129 } | |
| 130 | |
| 131 void * m_strdup(const char * str) { | |
| 132 char* ret; | |
| 133 unsigned int len; | |
| 134 len = strlen(str); | |
| 135 | |
| 136 ret = m_malloc(len+1); | |
| 137 if (ret == NULL) { | |
| 138 dropbear_exit("m_strdup failed"); | |
| 139 } | |
| 140 memcpy(ret, str, len+1); | |
| 141 return ret; | |
| 142 } | |
| 143 | |
| 144 |