static void
find_section_base(const char *exe, Elf *e, const char *section)
{
Dwarf_Addr off;
Elf_Scn *scn;
GElf_Ehdr eh;
GElf_Shdr sh;
size_t shstrndx;
int elferr;
const char *name;
if (gelf_getehdr(e, &eh) != &eh) {
warnx("gelf_getehdr failed: %s", elf_errmsg(-1));
return;
}
if (!elf_getshstrndx(e, &shstrndx)) {
warnx("elf_getshstrndx failed: %s", elf_errmsg(-1));
return;
}
(void) elf_errno();
off = 0;
scn = NULL;
while ((scn = elf_nextscn(e, scn)) != NULL) {
if (gelf_getshdr(scn, &sh) == NULL) {
warnx("gelf_getshdr failed: %s", elf_errmsg(-1));
continue;
}
if ((name = elf_strptr(e, shstrndx, sh.sh_name)) == NULL)
goto next;
if (!strcmp(section, name)) {
if (eh.e_type == ET_EXEC || eh.e_type == ET_DYN) {
/*
* For executables, section base is the virtual
* address of the specified section.
*/
section_base = sh.sh_addr;
} else if (eh.e_type == ET_REL) {
/*
* For relocatables, section base is the
* relative offset of the specified section
* to the start of the first section.
*/
section_base = off;
} else
warnx("unknown e_type %u", eh.e_type);
return;
}
next:
off += sh.sh_size;
}
elferr = elf_errno();
if (elferr != 0)
warnx("elf_nextscn failed: %s", elf_errmsg(elferr));
errx(EXIT_FAILURE, "%s: cannot find section %s", exe, section);
}
void
ld_dynamic_load_dso_dynamic(struct ld *ld, struct ld_input *li, Elf *e,
Elf_Scn *scn, size_t strndx)
{
GElf_Shdr shdr;
GElf_Dyn dyn;
Elf_Data *d;
int elferr, i, len;
const char *name;
if (strndx == SHN_UNDEF)
return;
if (gelf_getshdr(scn, &shdr) != &shdr) {
ld_warn(ld, "%s: gelf_getshdr failed: %s", li->li_name,
elf_errmsg(-1));
return;
}
(void) elf_errno();
if ((d = elf_getdata(scn, NULL)) == NULL) {
elferr = elf_errno();
if (elferr != 0)
ld_warn(ld, "%s: elf_getdata failed: %s", li->li_name,
elf_errmsg(elferr));
return;
}
len = d->d_size / shdr.sh_entsize;
for (i = 0; i < len; i++) {
if (gelf_getdyn(d, i, &dyn) != &dyn) {
ld_warn(ld, "%s: gelf_getdyn failed: %s", li->li_name,
elf_errmsg(-1));
continue;
}
switch (dyn.d_tag) {
case DT_SONAME:
name = elf_strptr(e, strndx, dyn.d_un.d_ptr);
if (name != NULL &&
(li->li_soname = strdup(name)) == NULL)
ld_fatal_std(ld, "strdup");
break;
case DT_NEEDED:
name = elf_strptr(e, strndx, dyn.d_un.d_ptr);
if (name != NULL)
ld_path_search_dso_needed(ld, li->li_file,
name);
break;
default:
break;
}
}
}
void
elferr()
{
fprintf(stderr, "%s: %s\n", prog, elf_errmsg(elf_errno()));
exit(1);
}
void
tcBadElf_tpElf(void)
{
int err;
Elf *e;
TS_PHDR *ph;
char badelf[sizeof(badelftemplate)];
TP_CHECK_INITIALIZATION();
tet_infoline("assertion: " TS_ICNAME "() on a malformed ELF file "
"fails with ELF_E_HEADER.");
(void) memcpy(badelf, badelftemplate, sizeof(badelf));
badelf[EI_VERSION] = EV_CURRENT;
badelf[EI_CLASS] = TS_ELFCLASS;
TS_OPEN_MEMORY(e, badelf);
if ((ph = TS_ICFUNC(e)) != NULL ||
(err = elf_errno()) != ELF_E_HEADER) {
tet_printf("fail: error=%d ph=%p.", err, (void *) ph);
tet_result(TET_FAIL);
} else
tet_result(TET_PASS);
(void) elf_end(e);
}
static inline int
canonicalize (Dwfl_Error error)
{
unsigned int value;
switch (error)
{
default:
value = error;
if ((value &~ 0xffff) != 0)
break;
assert (value < nmsgidx);
break;
case DWFL_E_ERRNO:
value = DWFL_E (ERRNO, errno);
break;
case DWFL_E_LIBELF:
value = DWFL_E (LIBELF, elf_errno ());
break;
case DWFL_E_LIBDW:
value = DWFL_E (LIBDW, INTUSE(dwarf_errno) ());
break;
#if 0
DWFL_E_LIBEBL:
value = DWFL_E (LIBEBL, ebl_errno ());
break;
#endif
}
return value;
}
/* Open libelf FILE->fd and compute the load base of ELF as loaded in MOD.
When we return success, FILE->elf and FILE->bias are set up. */
static inline Dwfl_Error
open_elf (Dwfl_Module *mod, struct dwfl_file *file)
{
if (file->elf == NULL)
{
/* If there was a pre-primed file name left that the callback left
behind, try to open that file name. */
if (file->fd < 0 && file->name != NULL)
file->fd = TEMP_FAILURE_RETRY (open64 (file->name, O_RDONLY));
if (file->fd < 0)
return CBFAIL;
file->elf = elf_begin (file->fd, ELF_C_READ_MMAP_PRIVATE, NULL);
}
if (unlikely (elf_kind (file->elf) != ELF_K_ELF))
{
close (file->fd);
file->fd = -1;
return DWFL_E_BADELF;
}
GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (file->elf, &ehdr_mem);
if (ehdr == NULL)
{
elf_error:
close (file->fd);
file->fd = -1;
return DWFL_E (LIBELF, elf_errno ());
}
/* The addresses in an ET_EXEC file are absolute. The lowest p_vaddr of
the main file can differ from that of the debug file due to prelink.
But that doesn't not change addresses that symbols, debuginfo, or
sh_addr of any program sections refer to. */
file->bias = 0;
if (mod->e_type != ET_EXEC)
for (uint_fast16_t i = 0; i < ehdr->e_phnum; ++i)
{
GElf_Phdr ph_mem;
GElf_Phdr *ph = gelf_getphdr (file->elf, i, &ph_mem);
if (ph == NULL)
goto elf_error;
if (ph->p_type == PT_LOAD)
{
file->bias = ((mod->low_addr & -ph->p_align)
- (ph->p_vaddr & -ph->p_align));
break;
}
}
mod->e_type = ehdr->e_type;
/* Relocatable Linux kernels are ET_EXEC but act like ET_DYN. */
if (mod->e_type == ET_EXEC && file->bias != 0)
mod->e_type = ET_DYN;
return DWFL_E_NOERROR;
}
static void check_libelf_version()
{
if (elf_version(EV_CURRENT) == EV_NONE) {
fprintf(stderr, "elf initialization failed: %s\n",
elf_errmsg(elf_errno()));
exit(1);
}
}
void
tcElf_tpCorruptEhdr(void)
{
int err, fd, result;
char *fn;
Elf *e;
TS_PHDR *ph;
TP_CHECK_INITIALIZATION();
tet_infoline("assertion: " TS_ICNAME "(E) with corrupt phdr values "
"the header returns E_HEADER.");
fn = "ehdr.msb" __XSTRING(TS_PHDRSZ);
TS_OPEN_FILE(e, fn, ELF_C_READ, fd);
result = TET_PASS;
if ((ph = TS_ICFUNC(e)) != NULL ||
(err = (elf_errno() != ELF_E_HEADER))) {
tet_printf("fail: \"%s\" (ph %p, error %d)", fn, (void *) ph,
err);
result = TET_FAIL;
}
(void) elf_end(e);
(void) close(fd);
if (result != TET_PASS) {
tet_result(result);
return;
}
fn = "ehdr.lsb" __XSTRING(TS_PHDRSZ);
TS_OPEN_FILE(e, fn, ELF_C_READ, fd);
if ((ph = TS_ICFUNC(e)) != NULL ||
(err = (elf_errno() != ELF_E_HEADER))) {
tet_printf("fail: \"%s\" (ph %p, error %d)", fn, (void *) ph,
err);
result = TET_FAIL;
}
(void) elf_end(e);
(void) close(fd);
tet_result(result);
}
/*
* Wrapper on msg_fatal() that issues an error that results from
* a call to libelf.
*
* entry:
* file - Name of ELF object
* libelf_rtn_name - Name of routine that was called
*
* exit:
* An error has been issued that shows the routine called
* and the libelf error string for it from elf_errmsg().
* This routine does not return to the caller.
*/
static void
msg_elf(const char *libelf_rtn_name)
{
const char *errstr = elf_errmsg(elf_errno());
msg_fatal("%s: %s failed: %s\n", file,
libelf_rtn_name, errstr ? errstr : "<unknown>");
}
void
tcElf_tpElfWrongSize(void)
{
int error, fd, result;
Elf *e;
char *fn;
TS_PHDR *ph;
TP_CHECK_INITIALIZATION();
tet_infoline("assertion: a call to " TS_ICNAME "() and a mismatched "
"ELF class fails with ELF_E_CLASS.");
result = TET_PASS;
fn = "phdr.msb" __XSTRING(TS_OTHERSIZE);
TS_OPEN_FILE(e,fn,ELF_C_READ,fd);
if ((ph = TS_ICFUNC(e)) != NULL ||
(error = elf_errno()) != ELF_E_CLASS) {
tet_printf("fail: \"%s\" opened (error %d).", fn, error);
result = TET_FAIL;
}
(void) elf_end(e);
(void) close(fd);
if (result != TET_PASS) {
tet_result(result);
return;
}
fn = "phdr.lsb" __XSTRING(TS_OTHERSIZE);
TS_OPEN_FILE(e,fn,ELF_C_READ,fd);
if ((ph = TS_ICFUNC(e)) != NULL ||
(error = elf_errno()) != ELF_E_CLASS) {
tet_printf("fail: \"%s\" opened (error %d).", fn, error);
result = TET_FAIL;
}
(void) elf_end(e);
(void) close(fd);
tet_result(result);
}
void print_elf_errno(int line_number)
{
int err;
if ((err = elf_errno()) != 0) {
fprintf(stderr, "%s (line %i): %s\n", PROGRAM_NAME, line_number, elf_errmsg(err));
exit(3);
}
}
/*
* Create an archive descriptor. By maintaining a list of archives any
* duplicate occurrences of the same archive specified by the user enable us to
* pick off where the last processing finished.
*/
Ar_desc *
ld_ar_setup(const char *name, Elf *elf, Ofl_desc *ofl)
{
Ar_desc * adp;
size_t number;
Elf_Arsym * start;
/*
* Unless, -z allextract is specified, get the archive symbol table
* if one exists, and ignore the file with a warning message otherwise.
*/
if (ofl->ofl_flags1 & FLG_OF1_ALLEXRT) {
start = NULL;
} else if ((start = elf_getarsym(elf, &number)) == NULL) {
if (elf_errno())
ld_eprintf(ofl, ERR_ELF, MSG_INTL(MSG_ELF_GETARSYM),
name);
else
ld_eprintf(ofl, ERR_WARNING, MSG_INTL(MSG_ELF_ARSYM),
name);
return (0);
}
/*
* As this is a new archive reference establish a new descriptor.
*/
if ((adp = libld_malloc(sizeof (Ar_desc))) == NULL)
return ((Ar_desc *)S_ERROR);
adp->ad_name = name;
adp->ad_elf = elf;
adp->ad_start = start;
if (start) {
adp->ad_aux = libld_calloc(sizeof (Ar_aux), number);
if (adp->ad_aux == NULL)
return ((Ar_desc *)S_ERROR);
} else {
adp->ad_aux = NULL;
}
/*
* Retain any command line options that are applicable to archive
* extraction in case we have to rescan this archive later.
*/
adp->ad_flags = ofl->ofl_flags1 & MSK_OF1_ARCHIVE;
ofl->ofl_arscnt++;
/*
* Add this new descriptor to the list of archives.
*/
if (aplist_append(&ofl->ofl_ars, adp, AL_CNT_OFL_LIBS) == NULL)
return ((Ar_desc *)S_ERROR);
else
return (adp);
}
void
tcNull_tpGet(void)
{
TP_CHECK_INITIALIZATION();
tet_infoline("assertion: " TS_ICNAME "(NULL) fails with "
"ELF_E_ARGUMENT.");
if (TS_ICFUNC(NULL) != NULL ||
elf_errno() != ELF_E_ARGUMENT)
tet_result(TET_FAIL);
else
tet_result(TET_PASS);
}
void
tcData_tpElf(void)
{
Elf *e;
TP_CHECK_INITIALIZATION();
tet_infoline("assertion: " TS_ICNAME "(E) for non-ELF (E) fails with "
"ELF_E_ARGUMENT.");
TS_OPEN_MEMORY(e, data);
if (TS_ICFUNC(e) != NULL ||
elf_errno() != ELF_E_ARGUMENT)
tet_result(TET_FAIL);
else
tet_result(TET_PASS);
(void) elf_end(e);
}
static int read_phdr(struct elf32_info *info, FILE *in)
{
int i;
if (info->file_ehdr.e_phnum > MAX_PHDRS) {
printc_err("elf32: too many program headers: %d\n",
info->file_ehdr.e_phnum);
return -1;
}
for (i = 0; i < info->file_ehdr.e_phnum; i++) {
GElf_Phdr *phdr = &info->file_phdrs[i];
if (gelf_getphdr(info->elf, i, phdr) != phdr) {
printc_err("elf32: can't read phdr %d: %s\n",
i, elf_errmsg(elf_errno()));
}
}
return 0;
}
/* Given Elf header, Elf_Scn, and Elf32_Shdr
* print out the symbol table
*/
static _Bool print_symbols(Elf *elf, Elf_Scn *scn, GElf_Shdr *shdr)
{
Elf_Data *data;
char *name;
char *stringName;
data = 0;
int number = 0;
if ((data = elf_getdata(scn, data)) == 0 || data->d_size == 0)
{
/* error or no data */
fprintf(stderr, "Section had no data!\n");
exit(-1);
}
/*now print the symbols*/
unsigned count = symtab_shdr.sh_size / symtab_shdr.sh_entsize;
//fprintf(stderr, "Total symbols count: %u\n", count);
/* now loop through the symbol table and print it*/
for (unsigned i = 0; i < count; ++i)
{
//fprintf(stderr, "Index is %u\n", i);
GElf_Sym esym;
GElf_Sym *ret = gelf_getsym(data, i, &esym);
if (ret == 0) { fprintf(stderr, "Error!\n"); return FALSE; }
if ((esym.st_value == 0) ||
(GELF_ST_BIND(esym.st_info)== STB_WEAK) ||
(GELF_ST_BIND(esym.st_info)== STB_NUM))
continue;
//fprintf(stderr, "Symbol has strtab offset %zu\n", (size_t)esym.st_name);
name = elf_strptr(elf, shdr->sh_link, (size_t)esym.st_name);
if(!name)
{
fprintf(stderr,"%s\n",elf_errmsg(elf_errno()));
exit(-1);
}
printf("%d: %s\n", number++, name);
}
return TRUE;
}
void
elfdie(char *format, ...)
{
va_list ap;
#ifndef illumos
const char *progname = getprogname();
#endif
(void) fprintf(stderr, "%s: ", progname);
va_start(ap, format);
/* LINTED - variable format specifier */
(void) vfprintf(stderr, format, ap);
va_end(ap);
if (format[strlen(format) - 1] != '\n')
(void) fprintf(stderr, ": %s\n", elf_errmsg(elf_errno()));
#ifndef illumos
exit(0);
#else
exit(1);
#endif
}
int
main (void)
{
size_t cnt;
int result = EXIT_SUCCESS;
/* Clear the error state. */
(void) elf_errno ();
/* Check all the messages of libelf. */
for (cnt = 1; cnt < ELF_E_NUM; ++cnt)
{
const char *str = elf_errmsg (libelf_msgs[cnt].id);
if (strcmp (str, libelf_msgs[cnt].expected) != 0)
{
printf ("libelf msg %zu: expected \"%s\", got \"%s\"\n",
cnt, libelf_msgs[cnt].expected, str);
result = EXIT_FAILURE;
}
}
return result;
}
