mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
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
/*-
|
|
* Copyright (c) 2006 Joseph Koshy
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef __LIBELF_H_
|
|
#define __LIBELF_H_
|
|
|
|
#include <sys/queue.h>
|
|
|
|
#ifndef NULL
|
|
#define NULL ((void *) 0)
|
|
#endif
|
|
|
|
/*
|
|
* Library-private data structures.
|
|
*/
|
|
|
|
#define LIBELF_MSG_SIZE 256
|
|
|
|
struct _libelf_globals {
|
|
int libelf_arch;
|
|
unsigned int libelf_byteorder;
|
|
int libelf_class;
|
|
int libelf_error;
|
|
int libelf_fillchar;
|
|
unsigned int libelf_version;
|
|
char libelf_msg[LIBELF_MSG_SIZE];
|
|
};
|
|
|
|
extern struct _libelf_globals _libelf;
|
|
|
|
#define LIBELF_PRIVATE(N) (_libelf.libelf_##N)
|
|
|
|
#define LIBELF_ELF_ERROR_MASK 0xFF
|
|
#define LIBELF_OS_ERROR_SHIFT 8
|
|
|
|
#define LIBELF_SET_ERROR(E, O) do { \
|
|
LIBELF_PRIVATE(error) = ((ELF_E_##E & LIBELF_ELF_ERROR_MASK)| \
|
|
((O) << LIBELF_OS_ERROR_SHIFT)); \
|
|
} while (0)
|
|
|
|
#define LIBELF_ADJUST_AR_SIZE(S) (((S) + 1U) & ~1U)
|
|
|
|
/*
|
|
* Flags for library internal use. These use the upper 16 bits of a
|
|
* flags field.
|
|
*/
|
|
#define LIBELF_F_MALLOCED 0x010000 /* whether data was malloc'ed */
|
|
#define LIBELF_F_MMAP 0x020000 /* whether e_rawfile was mmap'ed */
|
|
#define LIBELF_F_SHDRS_LOADED 0x040000 /* whether all shdrs were read in */
|
|
|
|
struct _Elf {
|
|
int e_activations; /* activation count */
|
|
Elf_Arhdr *e_arhdr; /* header for archive members */
|
|
unsigned int e_byteorder; /* ELFDATA* */
|
|
int e_class; /* ELFCLASS* */
|
|
Elf_Cmd e_cmd; /* ELF_C_* used at creation time */
|
|
int e_fd; /* associated file descriptor */
|
|
unsigned int e_flags; /* ELF_F_*, LIBELF_F_* flags */
|
|
Elf_Kind e_kind; /* ELF_K_* */
|
|
Elf *e_parent; /* non-NULL for archive members */
|
|
char *e_rawfile; /* uninterpreted bytes */
|
|
size_t e_rawsize; /* size of uninterpreted bytes */
|
|
unsigned int e_version; /* file version */
|
|
|
|
union {
|
|
struct { /* ar(1) archives */
|
|
off_t e_next; /* set by elf_rand()/elf_next() */
|
|
int e_nchildren;
|
|
char *e_rawstrtab; /* file name strings */
|
|
size_t e_rawstrtabsz;
|
|
char *e_rawsymtab; /* symbol table */
|
|
size_t e_rawsymtabsz;
|
|
Elf_Arsym *e_symtab;
|
|
size_t e_symtabsz;
|
|
} e_ar;
|
|
struct { /* regular ELF files */
|
|
union {
|
|
Elf32_Ehdr *e_ehdr32;
|
|
Elf64_Ehdr *e_ehdr64;
|
|
} e_ehdr;
|
|
union {
|
|
Elf32_Phdr *e_phdr32;
|
|
Elf64_Phdr *e_phdr64;
|
|
} e_phdr;
|
|
STAILQ_HEAD(, _Elf_Scn) e_scn; /* section list */
|
|
size_t e_nphdr; /* number of Phdr entries */
|
|
size_t e_nscn; /* number of sections */
|
|
size_t e_strndx; /* string table section index */
|
|
} e_elf;
|
|
} e_u;
|
|
};
|
|
|
|
struct _Elf_Scn {
|
|
union {
|
|
Elf32_Shdr s_shdr32;
|
|
Elf64_Shdr s_shdr64;
|
|
} s_shdr;
|
|
STAILQ_HEAD(, _Elf_Data) s_data; /* list of Elf_Data descriptors */
|
|
STAILQ_HEAD(, _Elf_Data) s_rawdata; /* raw data for this section */
|
|
STAILQ_ENTRY(_Elf_Scn) s_next;
|
|
struct _Elf *s_elf; /* parent ELF descriptor */
|
|
unsigned int s_flags; /* flags for the section as a whole */
|
|
size_t s_ndx; /* index# for this section */
|
|
uint64_t s_offset; /* managed by elf_update() */
|
|
uint64_t s_rawoff; /* original offset in the file */
|
|
uint64_t s_size; /* managed by elf_update() */
|
|
};
|
|
|
|
|
|
enum {
|
|
ELF_TOFILE,
|
|
ELF_TOMEMORY
|
|
};
|
|
|
|
#define LIBELF_COPY_U32(DST,SRC,NAME) do { \
|
|
if ((SRC)->NAME > UINT_MAX) { \
|
|
LIBELF_SET_ERROR(RANGE, 0); \
|
|
return (0); \
|
|
} \
|
|
(DST)->NAME = (SRC)->NAME; \
|
|
} while (0)
|
|
|
|
#define LIBELF_COPY_S32(DST,SRC,NAME) do { \
|
|
if ((SRC)->NAME > INT_MAX || \
|
|
(SRC)->NAME < INT_MIN) { \
|
|
LIBELF_SET_ERROR(RANGE, 0); \
|
|
return (0); \
|
|
} \
|
|
(DST)->NAME = (SRC)->NAME; \
|
|
} while (0)
|
|
|
|
|
|
/*
|
|
* Prototypes
|
|
*/
|
|
|
|
Elf_Data *_libelf_allocate_data(Elf_Scn *_s);
|
|
Elf *_libelf_allocate_elf(void);
|
|
Elf_Scn *_libelf_allocate_scn(Elf *_e, size_t _ndx);
|
|
Elf_Arhdr *_libelf_ar_gethdr(Elf *_e);
|
|
Elf *_libelf_ar_open(Elf *_e);
|
|
Elf *_libelf_ar_open_member(int _fd, Elf_Cmd _c, Elf *_ar);
|
|
Elf_Arsym *_libelf_ar_process_symtab(Elf *_ar, size_t *_dst);
|
|
unsigned long _libelf_checksum(Elf *_e, int _elfclass);
|
|
void *_libelf_ehdr(Elf *_e, int _elfclass, int _allocate);
|
|
int _libelf_falign(Elf_Type _t, int _elfclass);
|
|
size_t _libelf_fsize(Elf_Type _t, int _elfclass, unsigned int _version,
|
|
size_t count);
|
|
void (*_libelf_get_translator(Elf_Type _t, int _direction, int _elfclass))
|
|
(char *_dst, char *_src, size_t _cnt, int _byteswap);
|
|
void *_libelf_getphdr(Elf *_e, int _elfclass);
|
|
void *_libelf_getshdr(Elf_Scn *_scn, int _elfclass);
|
|
void _libelf_init_elf(Elf *_e, Elf_Kind _kind);
|
|
int _libelf_malign(Elf_Type _t, int _elfclass);
|
|
size_t _libelf_msize(Elf_Type _t, int _elfclass, unsigned int _version);
|
|
void *_libelf_newphdr(Elf *_e, int _elfclass, size_t _count);
|
|
Elf_Data *_libelf_release_data(Elf_Data *_d);
|
|
Elf *_libelf_release_elf(Elf *_e);
|
|
Elf_Scn *_libelf_release_scn(Elf_Scn *_s);
|
|
int _libelf_setphnum(Elf *_e, void *_eh, int _elfclass, size_t _phnum);
|
|
int _libelf_setshnum(Elf *_e, void *_eh, int _elfclass, size_t _shnum);
|
|
int _libelf_setshstrndx(Elf *_e, void *_eh, int _elfclass,
|
|
size_t _shstrndx);
|
|
Elf_Data *_libelf_xlate(Elf_Data *_d, const Elf_Data *_s,
|
|
unsigned int _encoding, int _elfclass, int _direction);
|
|
int _libelf_xlate_shtype(uint32_t _sht);
|
|
|
|
#endif /* __LIBELF_H_ */
|