f6c0f35e07
members of the ELF Executable Header inside the library-private
`struct _Elf' descriptor and only update the underlying Elf{32,64}_Ehdr
structure on an elf_update(3) call. These fields of the Ehdr
structure are technically `out of bounds' for an application program
per the ELF(3) API, but we've seen applications that initialize
a new Ehdr structure using memcpy(), messing up the library's
invariants. [1]
Implement elf_getphnum() and handle ELF objects with more than
64K program header table entries.
Reported by: jb [1]
194 lines
6.2 KiB
C
194 lines
6.2 KiB
C
/*-
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* Copyright (c) 2006 Joseph Koshy
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef __LIBELF_H_
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#define __LIBELF_H_
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#include <sys/queue.h>
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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/*
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* Library-private data structures.
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*/
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#define LIBELF_MSG_SIZE 256
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struct _libelf_globals {
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int libelf_arch;
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unsigned int libelf_byteorder;
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int libelf_class;
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int libelf_error;
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int libelf_fillchar;
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unsigned int libelf_version;
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char libelf_msg[LIBELF_MSG_SIZE];
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};
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extern struct _libelf_globals _libelf;
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#define LIBELF_PRIVATE(N) (_libelf.libelf_##N)
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#define LIBELF_ELF_ERROR_MASK 0xFF
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#define LIBELF_OS_ERROR_SHIFT 8
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#define LIBELF_SET_ERROR(E, O) do { \
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LIBELF_PRIVATE(error) = ((ELF_E_##E & LIBELF_ELF_ERROR_MASK)| \
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((O) << LIBELF_OS_ERROR_SHIFT)); \
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} while (0)
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#define LIBELF_ADJUST_AR_SIZE(S) (((S) + 1U) & ~1U)
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/*
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* Flags for library internal use. These use the upper 16 bits of a
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* flags field.
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*/
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#define LIBELF_F_MALLOCED 0x010000 /* whether data was malloc'ed */
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#define LIBELF_F_MMAP 0x020000 /* whether e_rawfile was mmap'ed */
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#define LIBELF_F_SHDRS_LOADED 0x040000 /* whether all shdrs were read in */
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struct _Elf {
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int e_activations; /* activation count */
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Elf_Arhdr *e_arhdr; /* header for archive members */
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unsigned int e_byteorder; /* ELFDATA* */
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int e_class; /* ELFCLASS* */
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Elf_Cmd e_cmd; /* ELF_C_* used at creation time */
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int e_fd; /* associated file descriptor */
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unsigned int e_flags; /* ELF_F_*, LIBELF_F_* flags */
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Elf_Kind e_kind; /* ELF_K_* */
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Elf *e_parent; /* non-NULL for archive members */
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char *e_rawfile; /* uninterpreted bytes */
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size_t e_rawsize; /* size of uninterpreted bytes */
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unsigned int e_version; /* file version */
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union {
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struct { /* ar(1) archives */
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off_t e_next; /* set by elf_rand()/elf_next() */
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int e_nchildren;
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char *e_rawstrtab; /* file name strings */
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size_t e_rawstrtabsz;
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char *e_rawsymtab; /* symbol table */
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size_t e_rawsymtabsz;
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Elf_Arsym *e_symtab;
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size_t e_symtabsz;
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} e_ar;
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struct { /* regular ELF files */
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union {
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Elf32_Ehdr *e_ehdr32;
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Elf64_Ehdr *e_ehdr64;
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} e_ehdr;
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union {
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Elf32_Phdr *e_phdr32;
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Elf64_Phdr *e_phdr64;
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} e_phdr;
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STAILQ_HEAD(, _Elf_Scn) e_scn; /* section list */
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size_t e_nphdr; /* number of Phdr entries */
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size_t e_nscn; /* number of sections */
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size_t e_strndx; /* string table section index */
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} e_elf;
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} e_u;
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};
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struct _Elf_Scn {
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union {
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Elf32_Shdr s_shdr32;
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Elf64_Shdr s_shdr64;
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} s_shdr;
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STAILQ_HEAD(, _Elf_Data) s_data; /* list of Elf_Data descriptors */
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STAILQ_HEAD(, _Elf_Data) s_rawdata; /* raw data for this section */
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STAILQ_ENTRY(_Elf_Scn) s_next;
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struct _Elf *s_elf; /* parent ELF descriptor */
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unsigned int s_flags; /* flags for the section as a whole */
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size_t s_ndx; /* index# for this section */
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uint64_t s_offset; /* managed by elf_update() */
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uint64_t s_rawoff; /* original offset in the file */
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uint64_t s_size; /* managed by elf_update() */
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};
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enum {
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ELF_TOFILE,
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ELF_TOMEMORY
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};
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#define LIBELF_COPY_U32(DST,SRC,NAME) do { \
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if ((SRC)->NAME > UINT_MAX) { \
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LIBELF_SET_ERROR(RANGE, 0); \
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return (0); \
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} \
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(DST)->NAME = (SRC)->NAME; \
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} while (0)
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#define LIBELF_COPY_S32(DST,SRC,NAME) do { \
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if ((SRC)->NAME > INT_MAX || \
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(SRC)->NAME < INT_MIN) { \
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LIBELF_SET_ERROR(RANGE, 0); \
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return (0); \
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} \
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(DST)->NAME = (SRC)->NAME; \
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} while (0)
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/*
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* Prototypes
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*/
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Elf_Data *_libelf_allocate_data(Elf_Scn *_s);
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Elf *_libelf_allocate_elf(void);
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Elf_Scn *_libelf_allocate_scn(Elf *_e, size_t _ndx);
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Elf_Arhdr *_libelf_ar_gethdr(Elf *_e);
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Elf *_libelf_ar_open(Elf *_e);
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Elf *_libelf_ar_open_member(int _fd, Elf_Cmd _c, Elf *_ar);
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Elf_Arsym *_libelf_ar_process_symtab(Elf *_ar, size_t *_dst);
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unsigned long _libelf_checksum(Elf *_e, int _elfclass);
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void *_libelf_ehdr(Elf *_e, int _elfclass, int _allocate);
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int _libelf_falign(Elf_Type _t, int _elfclass);
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size_t _libelf_fsize(Elf_Type _t, int _elfclass, unsigned int _version,
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size_t count);
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void (*_libelf_get_translator(Elf_Type _t, int _direction, int _elfclass))
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(char *_dst, char *_src, size_t _cnt, int _byteswap);
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void *_libelf_getphdr(Elf *_e, int _elfclass);
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void *_libelf_getshdr(Elf_Scn *_scn, int _elfclass);
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void _libelf_init_elf(Elf *_e, Elf_Kind _kind);
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int _libelf_malign(Elf_Type _t, int _elfclass);
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size_t _libelf_msize(Elf_Type _t, int _elfclass, unsigned int _version);
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void *_libelf_newphdr(Elf *_e, int _elfclass, size_t _count);
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Elf_Data *_libelf_release_data(Elf_Data *_d);
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Elf *_libelf_release_elf(Elf *_e);
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Elf_Scn *_libelf_release_scn(Elf_Scn *_s);
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int _libelf_setphnum(Elf *_e, void *_eh, int _elfclass, size_t _phnum);
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int _libelf_setshnum(Elf *_e, void *_eh, int _elfclass, size_t _shnum);
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int _libelf_setshstrndx(Elf *_e, void *_eh, int _elfclass,
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size_t _shstrndx);
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Elf_Data *_libelf_xlate(Elf_Data *_d, const Elf_Data *_s,
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unsigned int _encoding, int _elfclass, int _direction);
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int _libelf_xlate_shtype(uint32_t _sht);
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#endif /* __LIBELF_H_ */
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