Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 1 | /* Free resources associated with Elf descriptor. |
Mark Wielaard | 1ccdfb6 | 2015-09-22 22:27:01 +0200 | [diff] [blame] | 2 | Copyright (C) 1998,1999,2000,2001,2002,2004,2005,2007,2015 Red Hat, Inc. |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 3 | This file is part of elfutils. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 4 | Written by Ulrich Drepper <drepper@redhat.com>, 1998. |
| 5 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 6 | This file is free software; you can redistribute it and/or modify |
| 7 | it under the terms of either |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 8 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 9 | * the GNU Lesser General Public License as published by the Free |
| 10 | Software Foundation; either version 3 of the License, or (at |
| 11 | your option) any later version |
| 12 | |
| 13 | or |
| 14 | |
| 15 | * the GNU General Public License as published by the Free |
| 16 | Software Foundation; either version 2 of the License, or (at |
| 17 | your option) any later version |
| 18 | |
| 19 | or both in parallel, as here. |
| 20 | |
| 21 | elfutils is distributed in the hope that it will be useful, but |
Ulrich Drepper | 361df7d | 2006-04-04 21:38:57 +0000 | [diff] [blame] | 22 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 24 | General Public License for more details. |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 25 | |
Mark Wielaard | de2ed97 | 2012-06-05 17:15:16 +0200 | [diff] [blame] | 26 | You should have received copies of the GNU General Public License and |
| 27 | the GNU Lesser General Public License along with this program. If |
| 28 | not, see <http://www.gnu.org/licenses/>. */ |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 29 | |
| 30 | #ifdef HAVE_CONFIG_H |
| 31 | # include <config.h> |
| 32 | #endif |
| 33 | |
| 34 | #include <assert.h> |
| 35 | #include <stddef.h> |
| 36 | #include <stdlib.h> |
| 37 | #include <sys/mman.h> |
| 38 | |
| 39 | #include "libelfP.h" |
| 40 | |
| 41 | |
| 42 | int |
Mark Wielaard | 1ccdfb6 | 2015-09-22 22:27:01 +0200 | [diff] [blame] | 43 | elf_end (Elf *elf) |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 44 | { |
| 45 | Elf *parent; |
| 46 | |
| 47 | if (elf == NULL) |
| 48 | /* This is allowed and is a no-op. */ |
| 49 | return 0; |
| 50 | |
| 51 | /* Make sure we are alone. */ |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 52 | rwlock_wrlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 53 | |
| 54 | if (elf->ref_count != 0 && --elf->ref_count != 0) |
| 55 | { |
| 56 | /* Not yet the last activation. */ |
| 57 | int result = elf->ref_count; |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 58 | rwlock_unlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 59 | return result; |
| 60 | } |
| 61 | |
| 62 | if (elf->kind == ELF_K_AR) |
| 63 | { |
| 64 | /* We cannot remove the descriptor now since we still have some |
| 65 | descriptors which depend on it. But we can free the archive |
| 66 | symbol table since this is only available via the archive ELF |
| 67 | descriptor. The long name table cannot be freed yet since |
| 68 | the archive headers for the ELF files in the archive point |
| 69 | into this array. */ |
Roland McGrath | 59ea7f3 | 2007-10-04 08:50:09 +0000 | [diff] [blame] | 70 | if (elf->state.ar.ar_sym != (Elf_Arsym *) -1l) |
| 71 | free (elf->state.ar.ar_sym); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 72 | elf->state.ar.ar_sym = NULL; |
| 73 | |
| 74 | if (elf->state.ar.children != NULL) |
| 75 | return 0; |
| 76 | } |
| 77 | |
| 78 | /* Remove this structure from the children list. */ |
| 79 | parent = elf->parent; |
| 80 | if (parent != NULL) |
| 81 | { |
| 82 | /* This is tricky. Lock must be acquire from the father to |
| 83 | the child but here we already have the child lock. We |
| 84 | solve this problem by giving free the child lock. The |
| 85 | state of REF_COUNT==0 is handled all over the library, so |
| 86 | this should be ok. */ |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 87 | rwlock_unlock (elf->lock); |
| 88 | rwlock_rdlock (parent->lock); |
| 89 | rwlock_wrlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 90 | |
| 91 | if (parent->state.ar.children == elf) |
| 92 | parent->state.ar.children = elf->next; |
| 93 | else |
| 94 | { |
| 95 | struct Elf *child = parent->state.ar.children; |
| 96 | |
| 97 | while (child->next != elf) |
| 98 | child = child->next; |
| 99 | |
| 100 | child->next = elf->next; |
| 101 | } |
| 102 | |
Roland McGrath | b4d6f0f | 2008-08-25 22:55:17 +0000 | [diff] [blame] | 103 | rwlock_unlock (parent->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 104 | } |
| 105 | |
| 106 | /* This was the last activation. Free all resources. */ |
| 107 | switch (elf->kind) |
| 108 | { |
| 109 | case ELF_K_AR: |
| 110 | if (elf->state.ar.long_names != NULL) |
| 111 | free (elf->state.ar.long_names); |
| 112 | break; |
| 113 | |
| 114 | case ELF_K_ELF: |
| 115 | { |
Roland McGrath | 59ea7f3 | 2007-10-04 08:50:09 +0000 | [diff] [blame] | 116 | Elf_Data_Chunk *rawchunks |
| 117 | = (elf->class == ELFCLASS32 |
| 118 | || (offsetof (struct Elf, state.elf32.rawchunks) |
| 119 | == offsetof (struct Elf, state.elf64.rawchunks)) |
| 120 | ? elf->state.elf32.rawchunks |
| 121 | : elf->state.elf64.rawchunks); |
| 122 | while (rawchunks != NULL) |
| 123 | { |
| 124 | Elf_Data_Chunk *next = rawchunks->next; |
| 125 | if (rawchunks->dummy_scn.flags & ELF_F_MALLOCED) |
| 126 | free (rawchunks->data.d.d_buf); |
| 127 | free (rawchunks); |
| 128 | rawchunks = next; |
| 129 | } |
| 130 | |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 131 | Elf_ScnList *list = (elf->class == ELFCLASS32 |
| 132 | || (offsetof (struct Elf, state.elf32.scns) |
| 133 | == offsetof (struct Elf, state.elf64.scns)) |
| 134 | ? &elf->state.elf32.scns |
| 135 | : &elf->state.elf64.scns); |
| 136 | |
| 137 | do |
| 138 | { |
| 139 | /* Free all separately allocated section headers. */ |
| 140 | size_t cnt = list->max; |
| 141 | |
| 142 | while (cnt-- > 0) |
| 143 | { |
| 144 | /* These pointers can be NULL; it's safe to use |
| 145 | 'free' since it will check for this. */ |
| 146 | Elf_Scn *scn = &list->data[cnt]; |
| 147 | Elf_Data_List *runp; |
| 148 | |
| 149 | if ((scn->shdr_flags & ELF_F_MALLOCED) != 0) |
| 150 | /* It doesn't matter which pointer. */ |
| 151 | free (scn->shdr.e32); |
| 152 | |
Mark Wielaard | 272018b | 2015-12-19 01:29:54 +0100 | [diff] [blame] | 153 | /* Free zdata if uncompressed, but not yet used as |
| 154 | rawdata_base. If it is already used it will be |
| 155 | freed below. */ |
| 156 | if (scn->zdata_base != scn->rawdata_base) |
| 157 | free (scn->zdata_base); |
| 158 | |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 159 | /* If the file has the same byte order and the |
| 160 | architecture doesn't require overly stringent |
| 161 | alignment the raw data buffer is the same as the |
| 162 | one used for presenting to the caller. */ |
| 163 | if (scn->data_base != scn->rawdata_base) |
| 164 | free (scn->data_base); |
| 165 | |
| 166 | /* The section data is allocated if we couldn't mmap |
Mark Wielaard | 272018b | 2015-12-19 01:29:54 +0100 | [diff] [blame] | 167 | the file. Or if we had to decompress. */ |
| 168 | if (elf->map_address == NULL |
| 169 | || scn->rawdata_base == scn->zdata_base) |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 170 | free (scn->rawdata_base); |
| 171 | |
| 172 | /* Free the list of data buffers for the section. |
| 173 | We don't free the buffers themselves since this |
| 174 | is the users job. */ |
| 175 | runp = scn->data_list.next; |
| 176 | while (runp != NULL) |
| 177 | { |
| 178 | Elf_Data_List *oldp = runp; |
| 179 | runp = runp->next; |
| 180 | if ((oldp->flags & ELF_F_MALLOCED) != 0) |
| 181 | free (oldp); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | /* Free the memory for the array. */ |
| 186 | Elf_ScnList *oldp = list; |
| 187 | list = list->next; |
| 188 | assert (list == NULL || oldp->cnt == oldp->max); |
| 189 | if (oldp != (elf->class == ELFCLASS32 |
| 190 | || (offsetof (struct Elf, state.elf32.scns) |
| 191 | == offsetof (struct Elf, state.elf64.scns)) |
| 192 | ? &elf->state.elf32.scns |
| 193 | : &elf->state.elf64.scns)) |
| 194 | free (oldp); |
| 195 | } |
| 196 | while (list != NULL); |
| 197 | } |
| 198 | |
| 199 | /* Free the section header. */ |
| 200 | if (elf->state.elf.shdr_malloced != 0) |
| 201 | free (elf->class == ELFCLASS32 |
| 202 | || (offsetof (struct Elf, state.elf32.shdr) |
| 203 | == offsetof (struct Elf, state.elf64.shdr)) |
| 204 | ? (void *) elf->state.elf32.shdr |
| 205 | : (void *) elf->state.elf64.shdr); |
| 206 | |
| 207 | /* Free the program header. */ |
| 208 | if ((elf->state.elf.phdr_flags & ELF_F_MALLOCED) != 0) |
| 209 | free (elf->class == ELFCLASS32 |
| 210 | || (offsetof (struct Elf, state.elf32.phdr) |
| 211 | == offsetof (struct Elf, state.elf64.phdr)) |
| 212 | ? (void *) elf->state.elf32.phdr |
| 213 | : (void *) elf->state.elf64.phdr); |
| 214 | break; |
| 215 | |
| 216 | default: |
| 217 | break; |
| 218 | } |
| 219 | |
| 220 | if (elf->map_address != NULL && parent == NULL) |
| 221 | { |
| 222 | /* The file was read or mapped for this descriptor. */ |
| 223 | if ((elf->flags & ELF_F_MALLOCED) != 0) |
| 224 | free (elf->map_address); |
| 225 | else if ((elf->flags & ELF_F_MMAPPED) != 0) |
| 226 | munmap (elf->map_address, elf->maximum_size); |
| 227 | } |
| 228 | |
Mark Wielaard | 4955016 | 2012-02-26 13:14:32 +0100 | [diff] [blame] | 229 | rwlock_unlock (elf->lock); |
Ulrich Drepper | b08d5a8 | 2005-07-26 05:00:05 +0000 | [diff] [blame] | 230 | rwlock_fini (elf->lock); |
| 231 | |
| 232 | /* Finally the descriptor itself. */ |
| 233 | free (elf); |
| 234 | |
| 235 | return (parent != NULL && parent->ref_count == 0 |
| 236 | ? INTUSE(elf_end) (parent) : 0); |
| 237 | } |
| 238 | INTDEF(elf_end) |