It turns out the startup code in csu/elf-init.c has a perfect pair of
ROP gadgets (see Marco-Gisbert and Ripoll-Ripoll, "return-to-csu: A
New Method to Bypass 64-bit Linux ASLR"). These functions are not
needed in dynamically-linked binaries because DT_INIT/DT_INIT_ARRAY
are already processed by the dynamic linker. However, the dynamic
linker skipped the main program for some reason. For maximum
backwards compatibility, this is not changed, and instead, the main
map is consulted from __libc_start_main if the init function argument
is a NULL pointer.
For statically linked binaries, the old approach based on linker
symbols is still used because there is nothing else available.
A new symbol version __libc_start_main@@GLIBC_2.34 is introduced because
new binaries running on an old libc would not run their ELF
constructors, leading to difficult-to-debug issues.
I used these shell commands:
../glibc/scripts/update-copyrights $PWD/../gnulib/build-aux/update-copyright
(cd ../glibc && git commit -am"[this commit message]")
and then ignored the output, which consisted lines saying "FOO: warning:
copyright statement not found" for each of 6694 files FOO.
I then removed trailing white space from benchtests/bench-pthread-locks.c
and iconvdata/tst-iconv-big5-hkscs-to-2ucs4.c, to work around this
diagnostic from Savannah:
remote: *** pre-commit check failed ...
remote: *** error: lines with trailing whitespace found
remote: error: hook declined to update refs/heads/master
This symbol is only used by DL_UNMAP which in turn is only used by
_dl_close_worker in dl-close.c, and _dl_close_worker itself is marked
hidden as it is only used by the ldso. That means _dl_unmap should
be marked hidden. Without this, the elf/check-localplt test fails.
This symbol is defined in the ldso, and is used both there and libc.so.
There is no hidden symbol for it though which leads to relocations in
the ldso and the elf/check-localplt test failing. Add a hidden def for
rtld to fix all of that.
This function/file is only used by hppa & ia64, so no testing is needed
for other arches.
* nscd/nscd.c (termination_handler): Avoid segfault if some database
is not enabled.
* nscd/nscd_getai.c (__nscd_getai): If ai_resp->found == -1, set
__nss_not_use_nscd_hosts and return -1.
* nscd/nscd_initgroups.c (__nscd_getgrouplist): If
initgr_resp->found == -1, set __nss_not_use_nscd_group and return -1.
Avoid leaking sockets.
2005-01-28 Andreas Schwab <schwab@suse.de>
H.J. Lu <hongjiu.lu@intel.com>
[BZ #677]
* elf/dl-runtime.c (fixup): Change return type to
DL_FIXUP_VALUE_TYPE. Use DL_FIXUP_VALUE_TYPE,
DL_FIXUP_MAKE_VALUE and DL_FIXUP_VALUE_CODE_ADDR for relocation
values. Use DL_FIXUP_VALUE_ADDR and DL_FIXUP_ADDR_VALUE to
store and retrieve relocation values.
(profile_fixup): Likewise.
* include/link.h (link_map): Use DL_FIXUP_VALUE_TYPE for
l_reloc_result.
* sysdeps/generic/dl-fptr.h (link_map): Forward declaration.
* sysdeps/generic/dl-lookupcfg.h (DL_FIXUP_VALUE_TYPE): New.
(DL_FIXUP_MAKE_VALUE): Likewise.
(DL_FIXUP_VALUE_CODE_ADDR): Likewise.
(DL_FIXUP_VALUE_ADDR): Likewise.
(DL_FIXUP_ADDR_VALUE): Likewise.
* sysdeps/ia64/dl-lookupcfg.h: Include <dl-fptr.h> for "struct fdesc".
(DL_FIXUP_VALUE_TYPE): New.
(DL_FIXUP_MAKE_VALUE): Likewise.
(DL_FIXUP_VALUE_CODE_ADDR): Likewise.
(DL_FIXUP_VALUE_ADDR): Likewise.
(DL_FIXUP_ADDR_VALUE): Likewise.
* sysdeps/ia64/dl-machine.h (elf_machine_profile_fixup_plt): Removed.
(elf_machine_profile_plt): Removed.
(elf_machine_fixup_plt): Change return type and type of value
parameter to struct fdesc.
(elf_machine_plt_value): Likewise.
(elf_machine_rela): Use DL_FIXUP_MAKE_VALUE to construct
argument for elf_machine_fixup_plt.
2005-02-07 Jakub Jelinek <jakub@redhat.com>
2003-03-26 Ulrich Drepper <drepper@redhat.com>
* sysdeps/generic/ldsodefs.h (ELF_RTYPE_CLASS_COPY): Define to 2
only if DL_NO_COPY_RELOCS is not defined.
* sysdeps/ia64/dl-lookupcfg.h: Define DL_NO_COPY_RELOCS.
2001-06-07 David Mosberger <davidm@hpl.hp.com>
* sysdeps/ia64/dl-symaddr.c (_dl_symbol_address): Update call to
__ia64_make_fptr() for new interface.
(_dl_function_address): Remove.
* sysdeps/ia64/dl-machine.h (IA64_BOOT_FPTR_TABLE_LEN): Rename
from IA64_BOOT_FPTR_SIZE and reduce its value from 256 to 200.
(struct ia64_fdesc): Rename from struct ia64_fptr and drop "next"
pointer. Rename member "func" to "ip".
(struct ia64_fdesc_table): New type.
(__ia64_make_fptr): Change prototype.
(__ia64_init_bootstrap_fdesc_table): New function.
(ELF_MACHINE_BEFORE_RTLD_RELOC): New macro.
(__boot_ldso_fptr): Removed.
(__fptr_next): Removed.
(__fptr_root): Removed.
(__fptr_count): Removed.
(TRAMPOLINE_TEMPLATE): Fix typo in comment. Don't use multi-line
strings to avoid warning from gcc3.
(RTLD_START): Don't use multi-line strings.
(ELF_MACHINE_START_ADDRESS): Use DL_STATIC_FUNCTION_ADDRESS.
(elf_machine_fixup_plt): Update the code entry point in the
function descriptor through a "volatile" pointer to ensure proper
write ordering.
(elf_machine_rela): Simplify handling of FPTR relocs: always call
__ia64_make_fptr().
* sysdeps/ia64/dl-lookupcfg.h (DL_AUTO_FUNCTION_ADDRESS): New macro.
(DL_STATIC_FUNCTION_ADDRESS): Likewise.
(DL_DT_INIT_ADDRESS): Use DL_AUTO_FUNCTION_ADDRESS.
(DL_DT_FINI_ADDRESS): Likewise.
* sysdeps/ia64/dl-fptr.c: Rewrite for better scalability and to
avoid deadlocks.
* include/link.h: Add member machine specific "l_mach" member to
link_map.
* sysdeps/generic/bits/link.h: New file.
* sysdeps/ia64/bits/link.h: Likewise.
* elf/rtld.c (_dl_start): Fix typo in comment.
(_dl_start_final): Copy new "l_mach" member from temporary to
final bootstrap map.
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.
2000-11-15 H.J. Lu <hjl@gnu.org>
* sysdeps/generic/ldsodefs.h (DL_DT_INIT_ADDRESS): Defined if
ELF_FUNCTION_PTR_IS_SPECIAL is not defined.
(DL_DT_FINI_ADDRESS): Likewise.
* sysdeps/ia64/dl-lookupcfg.h (_dl_lookup_address): Set the
return type to ElfW(Addr).
(_dl_function_address): New prototype.
(DL_FUNCTION_ADDRESS): Defined.
(DL_DT_INIT_ADDRESS): Defined as DL_FUNCTION_ADDRESS.
(DL_DT_FINI_ADDRESS): Likewise.
* sysdeps/ia64/Versions (GLIBC_2.2): Add _dl_function_address.
* sysdeps/ia64/dl-machine.h (_dl_start_address): Removed.
(ELF_MACHINE_START_ADDRESS): Changed to DL_FUNCTION_ADDRESS.
* sysdeps/ia64/dl-symaddr.c (_dl_start_address): Renamed to ...
(_dl_function_address): This.
* elf/dl-fini.c (_dl_fini): Use DL_DT_FINI_ADDRESS to get the
function pointer for DT_FINI.
* elf/dl-close.c (_dl_close): Likewise.
* elf/dl-init.c (_dl_init): Use DL_DT_INIT_ADDRESS to get the
function pointer for DT_INIT.
2000-11-16 Jakub Jelinek <jakub@redhat.com>
* sysdeps/generic/printf_fphex.c (__printf_fphex): Compute correctly
end of wexpbuf buffer.
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.
2000-05-05 Ulrich Drepper <drepper@redhat.com>
* elf/dl-load.c (_dl_map_object_from_fd): Little of computation of
parameter to mprotect and for variable assignments.
2000-05-03 Jes Sorensen <jes@linuxcare.com>
* sysdeps/generic/ldsodefs.h (LOOKUP_VALUE_ADDRESS): Check the
validity of map before dereferencing it.
* elf/dl-reloc.c (RESOLVE_MAP): Define.
2000-05-02 Jes Sorensen <jes@linuxcare.com>
* elf/dl-runtime.c (fixup): Add the value returned in the symbol
lookup to the arguments to elf_machine_fixup_plt().
* sysdeps/ia64/dl-machine.h (elf_machine_fixup_plt): Add Link_map
of the symbol being resolved to input argument list and make the
function return the pointer to the reloc.
* sysdeps/alpha/dl-machine.h (elf_machine_fixup_plt): Change
return valuie to lookup_t and return the value.
* sysdeps/arm/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/generic/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/i386/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/m68k/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/sparc/sparc32/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/sparc/sparc64/dl-machine.h (elf_machine_fixup_plt): Likewise.
* sysdeps/powerpc/dl-machine.h (elf_machine_fixup_plt): Likewise.
Make it an inline function returning value after calling
__elf_machine_fixup_plt().
* elf/dl-sym.c (_dl_vsym): Use DL_SYMBOL_ADDRESS() to obtain the
symbol address.
* elf/dl-symbol.c (_dl_symbol_value): Use LOOKUP_VALUE_ADDRESS to
obtain the symbol address.
* sysdeps/generic/ldsodefs.h: Add generic DL_SYMBOL_ADDRESS() macro
depending on the definition of ELF_FUNCTION_PTR_IS_SPECIAL.
* sysdeps/ia64/dl-machine.h: Add DL_SYMBOL_ADDRESS() macro calling
_dl_symbol_address() - this way DL_SYMBOL_ADDRESS() turns into an
inline on non ia64.
2000-04-28 Jes Sorensen <jes@linuxcare.com>
* elf/dl-runtime.c (fixup): Use the portable macros to get the
symbol address of an object.
* elf/dl-runtime.c (fixup-profile): Use the portable macros to get
the symbol address of an object.
* elf/dl-libc.c (struct do_dlsym_args): Change loadbase to a lookup_t.
* elf/dl-lookup.c (_dl_lookup_symbol): Likewise.
(_dl_lookup_symbol_skip): Likewise.
(_dl_lookup_versioned_symbol): Likewise.
(_dl_lookup_versioned_symbol_skip): Likewise.
2000-04-27 Jes Sorensen <jes@linuxcare.com>
* elf/rtld.c (_dl_start): Get the function pointer return address
via _dl_start_address for architectures that need a function
pointer descriptor rather than just a pointer (ia64).
* sysdeps/generic/dl-lookupcfg.h: New file.
* sysdeps/ia64/dl-lookupcfg.h: New file.
* sysdeps/ia64/dl-machine.h: New file.
* sysdeps/ia64/dl-symaddr.c: New file.
* sysdeps/ia64/dl-fptr.c: New file.
* elf/elf.h: Add IA-64 specific definitions.
