Do not relocate absolute symbols by the base address. Such symbols have
SHN_ABS as the section index and their value is not supposed to be
affected by relocation as per the ELF gABI[1]:
"SHN_ABS
The symbol has an absolute value that will not change because of
relocation."
The reason for our non-conformance here seems to be an old SysV linker
bug causing symbols like _DYNAMIC to be incorrectly emitted as absolute
symbols[2]. However in a previous discussion it was pointed that this
is seriously flawed by preventing the lone purpose of the existence of
absolute symbols from being used[3]:
"On the contrary, the only interpretation that makes sense to me is that
it will not change because of relocation at link time or at load time.
Absolute symbols, from the days of the earliest linking loaders, have
been used to represent addresses that are outside the address space of
the module (e.g., memory-mapped addresses or kernel gateway pages).
They've even been used to represent true symbolic constants (e.g.,
system entry point numbers, sizes, version numbers). There's no other
way to represent a true absolute symbol, while the meaning you seek is
easily represented by giving the symbol a non-negative st_shndx value."
and we ought to stop supporting our current broken interpretation.
Update processing for dladdr(3) and dladdr1(3) so that SHN_ABS symbols
are ignored, because under the corrected interpretation they do not
represent addresses within a mapped file and therefore are not supposed
to be considered.
References:
[1] "System V Application Binary Interface - DRAFT - 19 October 2010",
The SCO Group, Section "Symbol Table",
<http://www.sco.com/developers/gabi/2012-12-31/ch4.symtab.html>
[2] Alan Modra, "Absolute symbols"
<https://sourceware.org/ml/binutils/2012-05/msg00019.html>
[3] Cary Coutant, "Re: Absolute symbols"
<https://sourceware.org/ml/binutils/2012-05/msg00020.html>
[BZ #19818]
* sysdeps/generic/ldsodefs.h (SYMBOL_ADDRESS): Handle SHN_ABS
symbols.
* elf/dl-addr.c (determine_info): Ignore SHN_ABS symbols.
* elf/tst-absolute-sym.c: New file.
* elf/tst-absolute-sym-lib.c: New file.
* elf/tst-absolute-sym-lib.lds: New file.
* elf/Makefile (tests): Add `tst-absolute-sym'.
(modules-names): Add `tst-absolute-sym-lib'.
(LDLIBS-tst-absolute-sym-lib.so): New variable.
($(objpfx)tst-absolute-sym-lib.so): New dependency.
($(objpfx)tst-absolute-sym): New dependency.
The only differences in ld.so are line numbers for asserts.
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
* elf/dl-addr.c (determine_info): Use ADDRIDX with DT_GNU_HASH.
* elf/dl-lookup.c (_dl_setup_hash): Likewise.
* elf/get-dynamic-info.h (elf_get_dynamic_info): Likewise.
The function _dl_addr_inside_object is simplified by removing
the conditional 'reladdr - l->l_phdr[n].p_vaddr >= 0' which is
always true. The function is refactored into it's own object file
and a unit test added to verify the correct behaviour of the
function.
In a reference to PR ld/19908 make ld.so respect symbol export classes
aka visibility and treat STV_HIDDEN and STV_INTERNAL symbols as local,
preventing such symbols from preempting exported symbols.
According to the ELF gABI[1] neither STV_HIDDEN nor STV_INTERNAL symbols
are supposed to be present in linked binaries:
"A hidden symbol contained in a relocatable object must be either
removed or converted to STB_LOCAL binding by the link-editor when the
relocatable object is included in an executable file or shared object."
"An internal symbol contained in a relocatable object must be either
removed or converted to STB_LOCAL binding by the link-editor when the
relocatable object is included in an executable file or shared object."
however some GNU binutils versions produce such symbols in some cases.
PR ld/19908 is one and we also have this note in scripts/abilist.awk:
so clearly there is linked code out there which contains such symbols
which is prone to symbol table misinterpretation, and it'll be more
productive if we handle this gracefully, under the Robustness Principle:
"be liberal in what you accept, and conservative in what you produce",
especially as this is a simple (STV_HIDDEN|STV_INTERNAL) => STB_LOCAL
mapping.
References:
[1] "System V Application Binary Interface - DRAFT - 24 April 2001",
The Santa Cruz Operation, Inc., "Symbol Table",
<http://www.sco.com/developers/gabi/2001-04-24/ch4.symtab.html>
* sysdeps/generic/ldsodefs.h
(dl_symbol_visibility_binds_local_p): New inline function.
* elf/dl-addr.c (determine_info): Treat hidden and internal
symbols as local.
* elf/dl-lookup.c (do_lookup_x): Likewise.
* elf/dl-reloc.c (RESOLVE_MAP): Likewise.
to fill in holes
(rtld_global_ro): Likewise.
2007-06-18 Jakub Jelinek <jakub@redhat.com>
* elf/dl-addr.c (_dl_addr): Skip PT_LOAD checking if l_contiguous.
Move PT_LOAD checking to...
(_dl_addr_inside_object): ... here, new function.
* elf/dl-sym.c (do_sym): If not l_contiguous,
call _dl_addr_inside_object.
* elf/dl-iteratephdr.c (__dl_iterate_phdr): Likewise.
* dlfcn/dlinfo.c (dlinfo_doit): Likewise.
* elf/dl-open.c (dl_open_worker): Likewise.
(_dl_addr_inside_object): New function if IS_IN_rtld.
* elf/dl-load.c (_dl_map_object_from_fd): Set l_contiguous if no
holes are present or are PROT_NONE protected.
* include/link.h (struct link_map): Add l_contiguous field.
* sysdeps/generic/ldsodefs.h (_dl_addr_inside_object): New prototype.
2007-05-06 Ulrich Drepper <drepper@redhat.com>
[BZ #4131]
* elf/dl-addr.c (_dl_addr): Compare address with actual segment
boundaries to work around systems with overlapping binary loading.
Based on a patch by Suzuki <suzuki@in.ibm.com>.
2006-08-24 Ulrich Drepper <drepper@redhat.com>
[BZ #2683]
* elf/dl-addr.c (_dl_addr): Don't ignore all undefined symbols.
If symbol has a value use it.
* elf/tst-dladdr1.c: New file.
* elf/Makefile: Add rules to build and run tst-addr1.
2006-06-23 Joseph Myers <joseph@codesourcery.com>
[BZ #2980]
* posix/Makefile (CFLAGS-waitid.c): Add
-fasynchronous-unwind-tables.
2006-08-02 Ulrich Drepper <drepper@redhat.com>
* elf/dl-addr.c (_dl_addr): If GNU-style hash tables are present,
walk them instead of the symbol table.
2005-08-01 Bob Wilson <bob.wilson@acm.org>
Richard Sandiford <richard@codesourcery.com>
* sysdeps/ieee754/flt-32/e_hypotf.c (__ieee754_hypotf): Add missing
exponent bias to the value for 2^126.
2005-08-30 Jakub Jelinek <jakub@redhat.com>
Alan Modra <amodra@bigpond.net.au>
* elf/dl-addr.c (_dl_addr): Use DL_ADDR_SYM_MATCH macro.
* sysdeps/generic/ldsodefs.h (DL_ADDR_SYM_MATCH): Define.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/ldsodefs.h: New file.
(_dl_out_of_memory): Use rtld_hidden_proto.
* elf/dl-error.c (_dl_out_of_memory): Use rtld_hidden_data_def.
(_dl_signal_error): Don't use INTUSE on _dl_out_of_memory.
* elf/dl-open.c (_dl_open): Likewise.
* elf/dl-deps.c (_dl_map_object_deps): Likewise.
* sunrpc/des_impl.c (des_set_key): Make first argument unsigned char *.
* elf/dl-addr.c (_dl_addr): Add a cast.
* elf/unload3mod4.c: Declare foo.
* elf/testobj2.c: Include <stdio.h>.
* sysdeps/gnu/errlist.awk: Emit NERR macro for _sys_nerr_internal
value constant, and use it in the defn.
* sysdeps/gnu/errlist-compat.awk: Use NERR in array decl.
Use actual size for compat array decls.
* config.make.in (cc-mtune): New substituted variable.
* configure.in (libc_cv_cc_mtune): New test for -mtune= switch,
done only if libc_mtune_example is defined.
* configure: Regenerated.
* sysdeps/i386/configure.in (libc_mtune_example): Set it.
* sysdeps/i386/configure: Regenerated.
* sysdeps/i386/Makefile (CFLAGS-initfini.s): Use $(cc-mtune).
Update.
Add support for namespaces in the dynamic linker.
* dlfcn/Makefile (libdl-routines): Add dlmopen.
* dlfcn/Versions [libdl, GLIBC_2.3.4]: Add dlmopen.
* dlfcn/dlfcn.h: Define Lmid_t, LM_ID_BASE, and LM_ID_NEWLM.
Declare dlmopen. Document RTLD_DI_LMID.
* dlfcn/dlinfo.c: Handle RTLD_DI_LMID.
* dlfcn/dlmopen.c: New file.
* dlfcn/dlopen.c: Pass new parameter to _dl_open.
* dlfcn/dlopenold.c: Likewise.
* elf/dl-addr.c: Adjust for removal of GL(dl_loaded).
* elf/dl-caller.c: Likewise.
* elf/dl-close.c: Likewise.
* elf/dl-conflict.c: Likewise.
* elf/dl-debug.c: Likewise.
* elf/dl-lookup.c: Likewise.
* elf/dl-sym.c: Likewise.
* elf/dl-version.c: Likewise.
* elf/do-lookup.h: Likewise.
* elf/rtld.c: Likewise.
* sysdeps/unix/sysv/linux/i386/dl-librecon.h: Likewise.
* elf/dl-depsc: Likewise. Add new parameter to _dl_map_object.
* elf/dl-fini.c: Call destructors in all namespaces.
* elf/dl-iteratephdr.c: Compute total nloaded. Adjust for removal of
GL(dl_loaded).
* elf/dl-libc.c: Pass new parameter to _dl_open. Adjust for removal
of GL(dl_loaded).
* elf/dl-load.c (_dl_map_object_from_fd): Don't load ld.so a second
time. Reuse the one from the main namespace in all others.
Pass new parameter to _dl_new_object.
Adjust for removal of GL(dl_loaded).
* elf/dl-object.c: Take new parameter. Use it to initialize l_ns.
Adjust for removal of GL(dl_loaded).
* elf/dl-open.c (_dl_open): Take new parameter.
Adjust for removal of GL(dl_loaded).
* elf/dl-support.c: Replace global _dl_loaded etc variables with
_dl_ns variable.
* include/dlfcn.h: Adjust prototype of _dl_open.
Define __LM_ID_CALLER.
* include/link.h: Add l_real, l_ns, and l_direct_opencount elements.
* sysdeps/generic/dl-tls.c: Bump TLS_STATIC_SURPLUS. Since libc is
using TLS we need memory appropriate to the number of namespaces.
* sysdeps/generic/ldsodefs.h (struct rtld_global): Replace _dl_loaded,
_dl_nloaded, _dl_global_scope, _dl_main_searchlist, and
_dl_global_scope_alloc with _dl_ns element. Define DL_NNS.
Adjust prototypes of _dl_map_object and member in rtld_global_ro.
* malloc/malloc.c: Include <dlfcn.h>.
* malloc/arena.c (ptmalloc_init): If libc is not in primary namespace,
never use brk.
* elf/Makefile: Add rules to build and run tst-dlmopen1 and
tst-dlmopen2.
* elf/tst-dlmopen1.c: New file.
* elf/tst-dlmopen1mod.c: New file.
* elf/tst-dlmopen2.c: New file.
* elf/dl-close.c: Improve reference counting by tracking direct loads.
* elf/dl-lookup.c (add_dependency): Likewise.
* elf/dl-open.c (dl_open_worker): Likewise.
* elf/rtld.c (dl_main): Likewise.
2004-09-09 GOTO Masanori <gotom@debian.or.jp>
[BZ #77]
* elf/dl-close.c: Count down l_opencount to check not only for
l_reldeps, but also l_initfini.
2004-10-13 Ulrich Drepper <drepper@redhat.com>
2004-02-20 Ulrich Drepper <drepper@redhat.com>
* dlfcn/dlsym.c: Get ld.so loading lock before the call into ld.so.
* dlfcn/dlvsym.c: Likewise.
* elf/dl-addr.c: Get loading lock while using _dl_loaded data.
* elf/dl-fini.c: Likewise.
Patch by Shunichi Sagawa <s-sagawa@jp.fujitsu.com>.
unconditionally. Set dli_fname to _dl_argv[0] only for main program.
2002-09-27 Roland McGrath <roland@redhat.com>
* elf/dl-addr.c (_dl_addr): Add a cast.
* sysdeps/x86_64/dl-machine.h (elf_machine_rela) [USE_TLS]: Handle new
TLS relocs R_X86_64_DTPMOD64, R_X86_64_DTPOFF64, and R_X86_64_TPOFF64.
* elf/elf.h (R_X86_64_DTPMOD64, R_X86_64_DTPOFF64, R_X86_64_TPOFF64,
R_X86_64_TLSGD, R_X86_64_TLSLD, R_X86_64_DTPOFF32,
R_x86_64_GOTTPOFF, R_X86_64_TPOFF32): New macros.
(R_X86_64_NUM): Update the value.
2002-09-26 Ulrich Drepper <drepper@redhat.com>
* elf/dynamic-link.h (elf_get_dynamic_info): Relocate DT_HASH entry
if necessary.
* elf/dl-lookup.c (_dl_setup_hash): DT_HASH entry is already relocated.
* elf/dl-addr.c (_dl_addr): Use .hash[1] entry to determine end of the
symbol table if necessary.
2001-08-22 Ulrich Drepper <drepper@redhat.com>
* elf/dl-addr.c (_dl_addr): Fix tests to determine dli_sname.
* malloc/mtrace.c (tr_where): dli_sname always points to a
non-empty string is != NULL.
Reported by Tim Janik <timj@gtk.org>.
2001-07-06 Paul Eggert <eggert@twinsun.com>
* manual/argp.texi: Remove ignored LGPL copyright notice; it's
not appropriate for documentation anyway.
* manual/libc-texinfo.sh: "Library General Public License" ->
"Lesser General Public License".
2001-07-06 Andreas Jaeger <aj@suse.de>
* All files under GPL/LGPL version 2: Place under LGPL version
2.1.
2000-09-26 Jakub Jelinek <jakub@redhat.com>
* sysdeps/sparc/sparc32/bits/endian.h: Remove.
* sysdeps/sparc/sparc32/ieee754.h: New.
* sysdeps/sparc/sparc64/bits/endian.h: Move...
* sysdeps/sparc/bits/endian.h: ...here.
* sysdeps/unix/sysv/linux/sparc/sparc32/clone.S (__clone): Optimize.
* sysdeps/unix/sysv/linux/sparc/sparc64/clone.S (__clone): Check
%o1, not %o0 to see if we're parent or child. Optimize.
2000-09-26 Jes Sorensen <jes@linuxcare.com>
* sysdeps/unix/sysv/linux/ia64/fork.S: New file (based on code
by Hans Boehm).
* sysdeps/unix/sysv/linux/ia64/vfork.S: New file (based on
code by Hans Boehm).
* sysdeps/unix/sysv/linux/ia64/fork.c: Deleted (obsoleted by fork.S).
2000-09-20 H.J. Lu <hjl@gnu.org>
* sysdeps/ia64/fpu/printf_fphex.c: New file.
* sysdeps/ia64/fpu/libm-test-ulps: New file.
2000-09-17 H.J. Lu <hjl@gnu.org>
* sysdeps/ia64/Makefile (long-double-fcts): New. Defined as yes.
* sysdeps/ia64/fpu/s_isinfl.c: New file. Include
sysdeps/i386/fpu/s_isinfl.c.
* sysdeps/ia64/fpu/s_isnanl.c: New file. Include
sysdeps/i386/fpu/s_isnanl.c.
* sysdeps/ia64/fpu/s_nextafterl.c: New file. Include
sysdeps/i386/fpu/s_nextafterl.c.
* sysdeps/ia64/fpu/bits/mathdef.h: New file. Copied from
sysdeps/i386/fpu/bits/mathdef.h.
2000-09-16 H.J. Lu <hjl@gnu.org>
* sysdeps/generic/ldsodefs.h (DL_UNMAP): New. Defined if
DL_UNMAP_IS_SPECIAL is not defined.
* sysdeps/ia64/dl-lookupcfg.h (DL_UNMAP_IS_SPECIAL): Defined.
(_dl_unmap): New prototype.
(DL_UNMAP): New. Defined as _dl_unmap.
* sysdeps/ia64/Versions [ld] (GLIBC_2.2): Add _dl_unmap.
* elf/dl-close.c (_dl_close): Replace __munmap with DL_UNMAP.
2000-09-16 H.J. Lu <hjl@gnu.org>
* sysdeps/generic/ldsodefs.h (DL_LOOKUP_ADDRESS): New. Defined
if ELF_FUNCTION_PTR_IS_SPECIAL is not defined.
* sysdeps/ia64/dl-lookupcfg.h (_dl_lookup_address): New
prototype.
(DL_LOOKUP_ADDRESS): New. Defined as _dl_lookup_address.
* sysdeps/ia64/dl-fptr.c (_dl_lookup_address): New. Lookup
the memory location of a function from a function descriptor.
* sysdeps/ia64/Versions [ld] (GLIBC_2.2): Add _dl_lookup_address.
* elf/dl-addr.c (_dl_addr): Use DL_LOOKUP_ADDRESS to get the
memory location.
2000-09-14 Jes Sorensen <jes@linuxcare.com>
* sysdeps/ia64/bits/byteswap.h (__bswap_16): Don't mark output
variable as input argument.
(__bswap_32): Likewise.
* sysdeps/ia64/dl-machine.h: Add missing stop bit in RTLD_START()
- found by Jim Wilson <wilson@cygnus.com>
2000-09-26 Ulrich Drepper <drepper@redhat.com>
* string/strxfrm.c: Only require alignment on __alignof__ (int32_t)
instead of 4.
2000-09-26 Andreas Schwab <schwab@suse.de>
* locale/programs/ld-collate.c (collate_output): Only require
alignment on __alignof__ (int32_t) instead of 4.
* locale/loadlocale.c (_nl_load_locale): Likewise.
* string/strcoll.c: Likewise.
2000-09-26 Jes Sorensen <jes@linuxcare.com>
* sysdeps/ieee754/ldbl-96/e_atan2l.c (__ieee754_atan2l): Add
parentheses around arithmetic used in | statement to kill compiler
warning.
* math/math_private.h: Add prototype for __finitel.
(__ilogbl): Likewise.
(__isinfl): Likewise.
(__isnanl): Likewise.
(__atanl): Likewise.
(__copysignl): Likewise.
(__expm1l): Likewise.
(__floorl): Likewise.
(__frexpl): Likewise.
(__ldexpl): Likewise.
(__log1pl): Likewise.
(__nanl): Likewise.
(__rintl): Likewise.
(__scalbnl): Likewise.
(__sqrtl): Likewise.
(fabsl): Likewise.
(__sincosl): Likewise.
(si_isr) [USE_GNU]: Likewise.
(ILL_BREAK) [USE_GNU]: Likewise.
(FPE_DECOVF) [USE_GNU]: Likewise.
(FPE_DECDIV) [USE_GNU]: Likewise.
(FPE_DECERR) [USE_GNU]: Likewise.
(FPE_INVASC) [USE_GNU]: Likewise.
(FPE_INVDEC) [USE_GNU]: Likewise.
(TRAP_BRANCH) [USE_GNU]: Likewise.
(TRAP_HWBKPT) [USE_GNU]: Likewise.
* sysdeps/ieee754/flt-32/s_exp2f.c: Likewise.
2000-07-17 Bruno Haible <haible@clisp.cons.org>
* iconv/gconv_open.c (__gconv_open): Initialize the __data
field of struct __gconv_trans_data differently. Don't pass NULL to
trans_init_fct. Simplify list append operation.
2000-07-14 Bruno Haible <haible@clisp.cons.org>
* intl/dcigettext.c (dcigettext): Call plural_eval on all platforms,
not only those having tsearch.
2000-07-17 Ulrich Drepper <drepper@redhat.com>
* locale/langinfo.h: Add placeholder values in enum for removed
LC_CTYPE entries.
2000-07-17 Jakub Jelinek <jakub@redhat.com>
* elf/dl-addr.c (_dl_addr): Keep searching in the _dl_loaded
chain if the PHDR check fails.
2000-07-17 Mark Kettenis <kettenis@gnu.org>
* nss/getent.c (print_hosts): Make sure we always print a space
between numeric addresses and hostnames.
2000-07-17 Wolfram Gloger <wg@malloc.de>
* malloc/malloc.c (chunk_alloc): Use mmap_chunk() only if allowed,
i.e. if n_mmaps_max>0.
2000-07-16 Mark Kettenis <kettenis@gnu.org>
* resolv/netdb.h (AI_V4MAPPED, AI_ALL, AI_ADDRCONFIG): Adjust
values to remove possible clash with other AI_* constants.
(AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST): Define as
hexadecimal constants to stress the fact they're in fact
bit flags.
2000-07-15 Mark Kettenis <kettenis@gnu.org>
* nss/getXXent_r.c [NEED__RES]: Include <resolv.h>.
(SETFUNC_NAME, ENDFUNC_NAME, REENTRANT_GETNAME): Use res_ninit
instead of res_init.
* elf/dynamic-link.h (elf_get_dynamic_info): Take new argument with
load address. Relocate d_ptr in DT_DTRTAB, DT_SYMTAB, DT_RELA, DT_REL,
DT_JMPREL, DT_PLTGOT, and DT_VERSYM l_info entry.
(_ELF_DYNAMIC_DO_RELOC): Take extra argument which specifies whether
rel and rela relocations can both happen and skip one test if this
is not possible.
(ELF_DYNAMIC_DO_RELA, ELF_DYNAMIC_DO_REL): Call _ELF_DYNAMIC_DO_RELOC
appropriately.
* elf/dl-addr.c (_dl_addr): DT_SYMTAB and DT_STRTAB entries are
already relocated.
* elf/dl-deps.c (_dl_map_object_deps): DT_STRTAB entry is already
relocated.
* elf/dl-load.c (_dl_init_paths): DT_STRTAB entry is already relocated.
(_dl_map_object_from_fd): Call elf_get_dynamic_info with new argument.
(_dl_map_object): DT_STRTAB entry is already relocated.
* elf/dl-lookup.c (do_lookup): DT_STRTAB and DT_SYMTAB entries are
already relocated.
* elf/dl-reloc.c (_dl_relocate_object): DT_STRTAB entry is already
relocated.
* elf/dl-runtime.c (fixup): DT_SYMTAB, DT_STRTAB, DT_JMPREL, and
DT_VERSYM entries are already relocated.
(profile_fixup): Likewise.
* elf/dl-version.c: Rename VERSTAG macro into VERSYMIDX. Replace
all users.
(match_symbol): DT_STRTAB entry is already relocated.
(_dl_check_map_versions): Likewise. Also fo DT_VERSYM.
* elf/do-rel.h (elf_dynamic_do_rel): reladdr is now assumed to be
relocated already. DT_SYMTAB and DT_VERSYM entries are also relocated.
* elf/rtld.c (_dl_start): Pass extra argument to elf_get_dynamic_info.
(find_needed): DT_STRTAB entry is already relocated.
(dl_main): Pass extra argument to elf_get_dynamic_info.
DT_STRTAB entry is already relocated.
* sysdeps/alpha/dl-machine.h (elf_machine_fixup_plt): DT_JMPREL and
DT_PLTGOT entries are already relocated.
(elf_machine_rela): Likewise for DT_SYMTAB.
* sysdeps/arm/dl-machine.h (elf_machine_rel): DT_STRTAB is already
relocated.
* sysdeps/i386/dl-machine.h (elf_machine_rel): Likewise.
* sysdeps/m68k/dl-machine.h (elf_machine_rela): Likewise.
* sysdeps/sparc/sparc32/dl-machine.h (elf_machine_rela): Likewise.
* sysdeps/sparc/sparc64/dl-machine.h (elf_machine_rela): Likewise.
* sysdeps/powerpc/dl-machine.c (__process_machine_rela): Likewise.
* sysdeps/mips/dl-machine.h (elf_machine_got_rel): Likewise.
(elf_machine_got_rel): Likewise for DT_SYMTAB and DT_STRTAB.
* grp/initgroups.c (initgroups): If function in current module was
successful don't stop but continue to process to get all the groups.
1998-09-01 15:36 Ulrich Drepper <drepper@cygnus.com>
* malloc/Makefile: Include Makeconfig before testing config-sysdirs.
* malloc/mtrace.c: Add bug report address. Update email address.
Add more @XXX@ to print correct address size.
* elf/dl-addr.c (_dl_addr): Make sure that map to be examined is
really initialized.
* elf/dl-close.c (_dl_close): Use l_map_start and l_map_end info
for munmap call instead of examining phdr again.
Free all malloc()ed strings and arrays.
