diff options
Diffstat (limited to 'src/libelf/elf32_getphdr.c')
| -rw-r--r-- | src/libelf/elf32_getphdr.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/src/libelf/elf32_getphdr.c b/src/libelf/elf32_getphdr.c new file mode 100644 index 00000000..80f54fd7 --- /dev/null +++ b/src/libelf/elf32_getphdr.c @@ -0,0 +1,266 @@ +/* Get ELF program header table. + Copyright (C) 1998-2010 Red Hat, Inc. + This file is part of Red Hat elfutils. + Written by Ulrich Drepper <drepper@redhat.com>, 1998. + + Red Hat elfutils is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by the + Free Software Foundation; version 2 of the License. + + Red Hat elfutils is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License along + with Red Hat elfutils; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. + + In addition, as a special exception, Red Hat, Inc. gives You the + additional right to link the code of Red Hat elfutils with code licensed + under any Open Source Initiative certified open source license + (http://www.opensource.org/licenses/index.php) which requires the + distribution of source code with any binary distribution and to + distribute linked combinations of the two. Non-GPL Code permitted under + this exception must only link to the code of Red Hat elfutils through + those well defined interfaces identified in the file named EXCEPTION + found in the source code files (the "Approved Interfaces"). The files + of Non-GPL Code may instantiate templates or use macros or inline + functions from the Approved Interfaces without causing the resulting + work to be covered by the GNU General Public License. Only Red Hat, + Inc. may make changes or additions to the list of Approved Interfaces. + Red Hat's grant of this exception is conditioned upon your not adding + any new exceptions. If you wish to add a new Approved Interface or + exception, please contact Red Hat. You must obey the GNU General Public + License in all respects for all of the Red Hat elfutils code and other + code used in conjunction with Red Hat elfutils except the Non-GPL Code + covered by this exception. If you modify this file, you may extend this + exception to your version of the file, but you are not obligated to do + so. If you do not wish to provide this exception without modification, + you must delete this exception statement from your version and license + this file solely under the GPL without exception. + + Red Hat elfutils is an included package of the Open Invention Network. + An included package of the Open Invention Network is a package for which + Open Invention Network licensees cross-license their patents. No patent + license is granted, either expressly or impliedly, by designation as an + included package. Should you wish to participate in the Open Invention + Network licensing program, please visit www.openinventionnetwork.com + <http://www.openinventionnetwork.com>. */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include <errno.h> +#include <stdbool.h> +#include <stdlib.h> +#include <unistd.h> +#include <assert.h> + +#include <system.h> +#include "libelfP.h" +#include "common.h" + +#ifndef LIBELFBITS +# define LIBELFBITS 32 +#endif + +ElfW2(LIBELFBITS,Phdr) * +__elfw2(LIBELFBITS,getphdr_wrlock) (elf) + Elf *elf; +{ + ElfW2(LIBELFBITS,Phdr) *result; + + /* If the program header entry has already been filled in the code + below must already have been run. So the class is set, too. No + need to waste any more time here. */ + result = elf->state.ELFW(elf,LIBELFBITS).phdr; + if (likely (result != NULL)) + return result; + + if (elf->class == 0) + elf->class = ELFW(ELFCLASS,LIBELFBITS); + else if (elf->class != ELFW(ELFCLASS,LIBELFBITS)) + { + __libelf_seterrno (ELF_E_INVALID_CLASS); + result = NULL; + goto out; + } + + if (likely (result == NULL)) + { + /* Read the section header table. */ + ElfW2(LIBELFBITS,Ehdr) *ehdr = elf->state.ELFW(elf,LIBELFBITS).ehdr; + + /* If no program header exists return NULL. */ + size_t phnum; + if (__elf_getphdrnum_rdlock (elf, &phnum) != 0) + goto out; + if (phnum == 0) + { + __libelf_seterrno (ELF_E_NO_PHDR); + goto out; + } + + size_t size = phnum * sizeof (ElfW2(LIBELFBITS,Phdr)); + + if (ehdr->e_phoff > elf->maximum_size + || elf->maximum_size - ehdr->e_phoff < size) + { + __libelf_seterrno (ELF_E_INVALID_DATA); + goto out; + } + + if (elf->map_address != NULL) + { + /* All the data is already mapped. Use it. */ + void *file_phdr = ((char *) elf->map_address + + elf->start_offset + ehdr->e_phoff); + if (ehdr->e_ident[EI_DATA] == MY_ELFDATA + && (ALLOW_UNALIGNED + || ((uintptr_t) file_phdr + & (__alignof__ (ElfW2(LIBELFBITS,Phdr)) - 1)) == 0)) + /* Simply use the mapped data. */ + elf->state.ELFW(elf,LIBELFBITS).phdr = file_phdr; + else + { + ElfW2(LIBELFBITS,Phdr) *notcvt; + ElfW2(LIBELFBITS,Phdr) *phdr; + + /* Allocate memory for the program headers. We know the number + of entries from the ELF header. */ + phdr = elf->state.ELFW(elf,LIBELFBITS).phdr = + (ElfW2(LIBELFBITS,Phdr) *) malloc (size); + if (elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) + { + __libelf_seterrno (ELF_E_NOMEM); + goto out; + } + elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= + ELF_F_MALLOCED | ELF_F_DIRTY; + + /* Now copy the data and at the same time convert the + byte order. */ + + if (ehdr->e_ident[EI_DATA] == MY_ELFDATA) + { + assert (! ALLOW_UNALIGNED); + memcpy (phdr, file_phdr, size); + } + else + { + if (ALLOW_UNALIGNED + || ((uintptr_t) file_phdr + & (__alignof__ (ElfW2(LIBELFBITS,Phdr)) - 1)) == 0) + notcvt = file_phdr; + else + { + notcvt = (ElfW2(LIBELFBITS,Phdr) *) alloca (size); + memcpy (notcvt, file_phdr, size); + } + + for (size_t cnt = 0; cnt < phnum; ++cnt) + { + CONVERT_TO (phdr[cnt].p_type, notcvt[cnt].p_type); + CONVERT_TO (phdr[cnt].p_offset, notcvt[cnt].p_offset); + CONVERT_TO (phdr[cnt].p_vaddr, notcvt[cnt].p_vaddr); + CONVERT_TO (phdr[cnt].p_paddr, notcvt[cnt].p_paddr); + CONVERT_TO (phdr[cnt].p_filesz, notcvt[cnt].p_filesz); + CONVERT_TO (phdr[cnt].p_memsz, notcvt[cnt].p_memsz); + CONVERT_TO (phdr[cnt].p_flags, notcvt[cnt].p_flags); + CONVERT_TO (phdr[cnt].p_align, notcvt[cnt].p_align); + } + } + } + } + else if (likely (elf->fildes != -1)) + { + /* Allocate memory for the program headers. We know the number + of entries from the ELF header. */ + elf->state.ELFW(elf,LIBELFBITS).phdr = + (ElfW2(LIBELFBITS,Phdr) *) malloc (size); + if (elf->state.ELFW(elf,LIBELFBITS).phdr == NULL) + { + __libelf_seterrno (ELF_E_NOMEM); + goto out; + } + elf->state.ELFW(elf,LIBELFBITS).phdr_flags |= ELF_F_MALLOCED; + + /* Read the header. */ + ssize_t n = pread_retry (elf->fildes, + elf->state.ELFW(elf,LIBELFBITS).phdr, size, + elf->start_offset + ehdr->e_phoff); + if (unlikely ((size_t) n != size)) + { + /* Severe problems. We cannot read the data. */ + __libelf_seterrno (ELF_E_READ_ERROR); + free (elf->state.ELFW(elf,LIBELFBITS).phdr); + elf->state.ELFW(elf,LIBELFBITS).phdr = NULL; + goto out; + } + + /* If the byte order of the file is not the same as the one + of the host convert the data now. */ + if (ehdr->e_ident[EI_DATA] != MY_ELFDATA) + { + ElfW2(LIBELFBITS,Phdr) *phdr + = elf->state.ELFW(elf,LIBELFBITS).phdr; + + for (size_t cnt = 0; cnt < phnum; ++cnt) + { + CONVERT (phdr[cnt].p_type); + CONVERT (phdr[cnt].p_offset); + CONVERT (phdr[cnt].p_vaddr); + CONVERT (phdr[cnt].p_paddr); + CONVERT (phdr[cnt].p_filesz); + CONVERT (phdr[cnt].p_memsz); + CONVERT (phdr[cnt].p_flags); + CONVERT (phdr[cnt].p_align); + } + } + } + else + { + /* The file descriptor was already enabled and not all data was + read. */ + __libelf_seterrno (ELF_E_FD_DISABLED); + goto out; + } + + result = elf->state.ELFW(elf,LIBELFBITS).phdr; + } + + out: + return result; +} + +ElfW2(LIBELFBITS,Phdr) * +elfw2(LIBELFBITS,getphdr) (elf) + Elf *elf; +{ + ElfW2(LIBELFBITS,Phdr) *result; + + if (elf == NULL) + return NULL; + + if (unlikely (elf->kind != ELF_K_ELF)) + { + __libelf_seterrno (ELF_E_INVALID_HANDLE); + return NULL; + } + + /* If the program header entry has already been filled in the code + * in getphdr_wrlock must already have been run. So the class is + * set, too. No need to waste any more time here. */ + result = elf->state.ELFW(elf,LIBELFBITS).phdr; + if (likely (result != NULL)) + return result; + + rwlock_wrlock (elf->lock); + result = __elfw2(LIBELFBITS,getphdr_wrlock) (elf); + rwlock_unlock (elf->lock); + + return result; +} +INTDEF(elfw2(LIBELFBITS,getphdr)) |