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Update.
2004-01-13 Ulrich Drepper <drepper@redhat.com> * Makeconfig: Define relro-LDFLAGS if have-z-relro==yes. Add it to LDFLAGS.so and LDFLAGS-rtld. (+link): Add relro-LDFLAGS. * Makeconfig (shlib.lds): Place __libc_subfreeres, __libc_atexit, and __libc_thread_subfreeres sections after .jcr section. * config.make.in: Add have-z-relro. * configure.in: Add check for -z relro option. * include/link.h (struct link_map): Add relro_addr and relro_size members. * elf/dl-load.c (_dl_map_object_from_fd): Recognize PT_GNU_RELRO. * elf/dl-reloc.c (_dl_relocate_object): At the end, make relro part of loaded segments read-only. * elf/elf.h: Define PT_GNU_RELRO. * elf/rtld.c (_dl_start): Recognize PT_GNU_RELRO of ld.so. (dl_main): Recognize PT_GNU_RELRO of the application. Call _dl_debug_initialize and initialize l_info[DT_DEBUG] before relocations.
This commit is contained in:
Ulrich Drepper
parent
1c563add69
commit
ed20b3d9cc
20
ChangeLog
20
ChangeLog
@ -1,3 +1,23 @@
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2004-01-13 Ulrich Drepper <drepper@redhat.com>
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* Makeconfig: Define relro-LDFLAGS if have-z-relro==yes. Add it to
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LDFLAGS.so and LDFLAGS-rtld.
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(+link): Add relro-LDFLAGS.
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* Makeconfig (shlib.lds): Place __libc_subfreeres, __libc_atexit, and
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__libc_thread_subfreeres sections after .jcr section.
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* config.make.in: Add have-z-relro.
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* configure.in: Add check for -z relro option.
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* include/link.h (struct link_map): Add relro_addr and relro_size
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members.
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* elf/dl-load.c (_dl_map_object_from_fd): Recognize PT_GNU_RELRO.
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* elf/dl-reloc.c (_dl_relocate_object): At the end, make relro
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part of loaded segments read-only.
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* elf/elf.h: Define PT_GNU_RELRO.
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* elf/rtld.c (_dl_start): Recognize PT_GNU_RELRO of ld.so.
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(dl_main): Recognize PT_GNU_RELRO of the application. Call
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_dl_debug_initialize and initialize l_info[DT_DEBUG] before
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relocations.
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2004-01-12 Jakub Jelinek <jakub@redhat.com>
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* sysdeps/x86_64/strcspn.S: Fix typo in last patch.
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14
Makerules
14
Makerules
@ -1,4 +1,4 @@
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# Copyright (C) 1991-2002, 2003 Free Software Foundation, Inc.
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# Copyright (C) 1991-2002, 2003, 2004 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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@ -488,7 +488,17 @@ $(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules
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-e 's/^.*\*(\.dynbss).*$$/& \
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PROVIDE(__start___libc_freeres_ptrs = .); \
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*(__libc_freeres_ptrs) \
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PROVIDE(__stop___libc_freeres_ptrs = .);/'
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PROVIDE(__stop___libc_freeres_ptrs = .);/'\
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-e 's/^.*\*(\.jcr).*$$/&\n\
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PROVIDE(__start___libc_subfreeres = .);\n\
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__libc_subfreeres : { *(__libc_subfreeres) }\n\
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PROVIDE(__stop___libc_subfreeres = .);\n\
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PROVIDE(__start___libc_atexit = .);\n\
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__libc_atexit : { *(__libc_atexit) }\n\
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PROVIDE(__stop___libc_atexit = .);\n\
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PROVIDE(__start___libc_thread_subfreeres = .);\n\
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__libc_thread_subfreeres : { *(__libc_thread_subfreeres) }\n\
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PROVIDE(__stop___libc_thread_subfreeres = .);/'
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mv -f $@T $@
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common-generated += shlib.lds
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@ -44,6 +44,7 @@ have-z-initfirst = @libc_cv_z_initfirst@
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have-z-combreloc = @libc_cv_z_combreloc@
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have-z-execstack = @libc_cv_z_execstack@
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have-initfini = @libc_cv_have_initfini@
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have-z-relro = @libc_cv_z_relro@
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have-Bgroup = @libc_cv_Bgroup@
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need-nopic-initfini = @nopic_initfini@
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with-fp = @with_fp@
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24
configure
vendored
24
configure
vendored
@ -313,7 +313,7 @@ ac_includes_default="\
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# include <unistd.h>
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#endif"
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ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi subdirs force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF CCVERSION SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_Bgroup ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_have_initfini libc_cv_cpp_asm_debuginfo no_whole_archive exceptions LIBGD EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
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ac_subst_vars='SHELL PATH_SEPARATOR PACKAGE_NAME PACKAGE_TARNAME PACKAGE_VERSION PACKAGE_STRING PACKAGE_BUGREPORT exec_prefix prefix program_transform_name bindir sbindir libexecdir datadir sysconfdir sharedstatedir localstatedir libdir includedir oldincludedir infodir mandir build_alias host_alias target_alias DEFS ECHO_C ECHO_N ECHO_T LIBS with_fp with_cvs enable_check_abi oldest_abi subdirs force_install all_warnings build build_cpu build_vendor build_os host host_cpu host_vendor host_os base_machine sysnames INSTALL_PROGRAM INSTALL_SCRIPT INSTALL_DATA LN_S CC CFLAGS LDFLAGS CPPFLAGS ac_ct_CC OBJEXT BUILD_CC cross_compiling CPP CXX CXXFLAGS ac_ct_CXX AR OBJDUMP RANLIB ac_ct_RANLIB MIG AS LD PWD_P MAKE MSGFMT MAKEINFO SED AUTOCONF CCVERSION SYSINCLUDES libc_cv_gcc_static_libgcc BASH libc_cv_have_bash2 KSH libc_cv_have_ksh AWK PERL INSTALL_INFO BISON VERSIONING libc_cv_asm_protected_directive libc_cv_initfinit_array libc_cv_cc_with_libunwind libc_cv_z_nodelete libc_cv_z_nodlopen libc_cv_z_initfirst libc_cv_z_relro libc_cv_Bgroup ASFLAGS_config libc_cv_z_combreloc libc_cv_z_execstack libc_cv_fpie fno_unit_at_a_time libc_cv_have_initfini libc_cv_cpp_asm_debuginfo no_whole_archive exceptions LIBGD EGREP sizeof_long_double libc_cv_gcc_unwind_find_fde uname_sysname uname_release uname_version old_glibc_headers libc_cv_slibdir libc_cv_localedir libc_cv_sysconfdir libc_cv_rootsbindir libc_cv_forced_unwind use_ldconfig ldd_rewrite_script gnu_ld gnu_as elf xcoff static shared pic_default profile omitfp bounded static_nss nopic_initfini DEFINES linux_doors mach_interface_list VERSION RELEASE LIBOBJS LTLIBOBJS'
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ac_subst_files=''
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# Initialize some variables set by options.
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@ -5496,6 +5496,27 @@ echo "$as_me:$LINENO: result: $libc_cv_z_initfirst" >&5
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echo "${ECHO_T}$libc_cv_z_initfirst" >&6
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echo "$as_me:$LINENO: checking for -z relro option" >&5
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echo $ECHO_N "checking for -z relro option... $ECHO_C" >&6
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if test "${libc_cv_z_relro+set}" = set; then
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echo $ECHO_N "(cached) $ECHO_C" >&6
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else
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if { ac_try='${CC-cc} -v --help 2>&1|grep "z relro" 1>&5'
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{ (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5
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(eval $ac_try) 2>&5
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ac_status=$?
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echo "$as_me:$LINENO: \$? = $ac_status" >&5
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(exit $ac_status); }; }
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then
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libc_cv_z_relro=yes
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else
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libc_cv_z_relro=no
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fi
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fi
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echo "$as_me:$LINENO: result: $libc_cv_z_relro" >&5
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echo "${ECHO_T}$libc_cv_z_relro" >&6
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echo "$as_me:$LINENO: checking for -Bgroup option" >&5
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echo $ECHO_N "checking for -Bgroup option... $ECHO_C" >&6
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if test "${libc_cv_Bgroup+set}" = set; then
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@ -8175,6 +8196,7 @@ s,@libc_cv_cc_with_libunwind@,$libc_cv_cc_with_libunwind,;t t
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s,@libc_cv_z_nodelete@,$libc_cv_z_nodelete,;t t
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s,@libc_cv_z_nodlopen@,$libc_cv_z_nodlopen,;t t
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s,@libc_cv_z_initfirst@,$libc_cv_z_initfirst,;t t
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s,@libc_cv_z_relro@,$libc_cv_z_relro,;t t
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s,@libc_cv_Bgroup@,$libc_cv_Bgroup,;t t
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s,@ASFLAGS_config@,$ASFLAGS_config,;t t
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s,@libc_cv_z_combreloc@,$libc_cv_z_combreloc,;t t
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10
configure.in
10
configure.in
@ -1283,6 +1283,16 @@ EOF
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rm -f conftest*])
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AC_SUBST(libc_cv_z_initfirst)
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AC_CACHE_CHECK(for -z relro option,
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libc_cv_z_relro, [dnl
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if AC_TRY_COMMAND([${CC-cc} -v --help 2>&1|grep "z relro" 1>&AS_MESSAGE_LOG_FD])
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then
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libc_cv_z_relro=yes
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else
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libc_cv_z_relro=no
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fi])
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AC_SUBST(libc_cv_z_relro)
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AC_CACHE_CHECK(for -Bgroup option,
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libc_cv_Bgroup, [dnl
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cat > conftest.c <<EOF
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@ -1,5 +1,5 @@
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/* Map in a shared object's segments from the file.
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Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
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Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -1065,6 +1065,11 @@ cannot allocate TLS data structures for initial thread");
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case PT_GNU_STACK:
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stack_flags = ph->p_flags;
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break;
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case PT_GNU_RELRO:
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l->l_relro_addr = ph->p_vaddr;
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l->l_relro_size = ph->p_memsz;
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break;
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}
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if (__builtin_expect (nloadcmds == 0, 0))
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@ -1,5 +1,5 @@
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/* Relocate a shared object and resolve its references to other loaded objects.
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Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
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Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -307,6 +307,24 @@ _dl_relocate_object (struct link_map *l, struct r_scope_elem *scope[],
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textrels = textrels->next;
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}
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/* In case we can protect the data now that the relocations are
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done, do it. */
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if (l->l_relro_size != 0)
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{
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ElfW(Addr) start = ((l->l_addr + l->l_relro_addr)
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& ~(GL(dl_pagesize) - 1));
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ElfW(Addr) end = ((l->l_addr + l->l_relro_addr + l->l_relro_size)
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& ~(GL(dl_pagesize) - 1));
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if (start != end
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&& __mprotect ((void *) start, end - start, PROT_READ) < 0)
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{
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errstring = N_("\
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cannot apply additional memory protection after relocation");
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goto call_error;
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}
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}
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}
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INTDEF (_dl_relocate_object)
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@ -1,5 +1,5 @@
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/* This file defines standard ELF types, structures, and macros.
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Copyright (C) 1995-1999,2000,2001,2002,2003 Free Software Foundation, Inc.
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Copyright (C) 1995-2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -567,6 +567,7 @@ typedef struct
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#define PT_LOOS 0x60000000 /* Start of OS-specific */
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#define PT_GNU_EH_FRAME 0x6474e550 /* GCC .eh_frame_hdr segment */
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#define PT_GNU_STACK 0x6474e551 /* Indicates stack executability */
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#define PT_GNU_RELRO 0x6474e552 /* Read-only after relocation */
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#define PT_LOSUNW 0x6ffffffa
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#define PT_SUNWBSS 0x6ffffffa /* Sun Specific segment */
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#define PT_SUNWSTACK 0x6ffffffb /* Stack segment */
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|
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84
elf/rtld.c
84
elf/rtld.c
@ -1,5 +1,5 @@
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/* Run time dynamic linker.
|
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Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
|
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Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
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|
||||
The GNU C Library is free software; you can redistribute it and/or
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@ -332,13 +332,14 @@ _dl_start (void *arg)
|
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bootstrap_map.l_tls_offset = NO_TLS_OFFSET;
|
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#endif
|
||||
|
||||
#if USE___THREAD
|
||||
/* Get the dynamic linker's own program header. First we need the ELF
|
||||
file header. The `_begin' symbol created by the linker script points
|
||||
to it. When we have something like GOTOFF relocs, we can use a plain
|
||||
reference to find the runtime address. Without that, we have to rely
|
||||
on the `l_addr' value, which is not the value we want when prelinked. */
|
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#if USE___THREAD
|
||||
dtv_t initdtv[3];
|
||||
#endif /* USE___THREAD */
|
||||
ElfW(Ehdr) *ehdr
|
||||
# ifdef DONT_USE_BOOTSTRAP_MAP
|
||||
= (ElfW(Ehdr) *) &_begin;
|
||||
@ -348,6 +349,7 @@ _dl_start (void *arg)
|
||||
ElfW(Phdr) *phdr = (ElfW(Phdr) *) ((void *) ehdr + ehdr->e_phoff);
|
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size_t cnt = ehdr->e_phnum; /* PT_TLS is usually the last phdr. */
|
||||
while (cnt-- > 0)
|
||||
#if USE___THREAD
|
||||
if (phdr[cnt].p_type == PT_TLS)
|
||||
{
|
||||
void *tlsblock;
|
||||
@ -442,11 +444,14 @@ _dl_start (void *arg)
|
||||
|
||||
/* So far this is module number one. */
|
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bootstrap_map.l_tls_modid = 1;
|
||||
|
||||
/* There can only be one PT_TLS entry. */
|
||||
break;
|
||||
}
|
||||
else
|
||||
#endif /* USE___THREAD */
|
||||
if (phdr[cnt].p_type == PT_GNU_RELRO)
|
||||
{
|
||||
bootstrap_map.l_relro_addr = phdr[cnt].p_vaddr;
|
||||
bootstrap_map.l_relro_size = phdr[cnt].p_memsz;
|
||||
}
|
||||
|
||||
#ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
|
||||
ELF_MACHINE_BEFORE_RTLD_RELOC (bootstrap_map.l_info);
|
||||
@ -777,6 +782,11 @@ of this helper program; chances are you did not intend to run this program.\n\
|
||||
GL(dl_stack_flags) = ph->p_flags;
|
||||
break;
|
||||
}
|
||||
else if (ph->p_type == PT_GNU_RELRO)
|
||||
{
|
||||
GL(dl_loaded)->l_relro_addr = ph->p_vaddr;
|
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GL(dl_loaded)->l_relro_size = ph->p_memsz;
|
||||
}
|
||||
|
||||
if (__builtin_expect (mode, normal) == verify)
|
||||
{
|
||||
@ -1598,6 +1608,35 @@ cannot allocate TLS data structures for initial thread");
|
||||
_dl_printf ("\nprelink checking: %s\n", prelinked ? "ok" : "failed");
|
||||
}
|
||||
|
||||
|
||||
/* Initialize _r_debug. */
|
||||
struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr);
|
||||
{
|
||||
struct link_map *l;
|
||||
|
||||
l = GL(dl_loaded);
|
||||
|
||||
#ifdef ELF_MACHINE_DEBUG_SETUP
|
||||
|
||||
/* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
|
||||
|
||||
ELF_MACHINE_DEBUG_SETUP (l, r);
|
||||
ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r);
|
||||
|
||||
#else
|
||||
|
||||
if (l->l_info[DT_DEBUG] != NULL)
|
||||
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
|
||||
with the run-time address of the r_debug structure */
|
||||
l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
|
||||
|
||||
/* Fill in the pointer in the dynamic linker's own dynamic section, in
|
||||
case you run gdb on the dynamic linker directly. */
|
||||
if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL)
|
||||
GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
|
||||
#endif
|
||||
}
|
||||
|
||||
if (prelinked)
|
||||
{
|
||||
struct link_map *l;
|
||||
@ -1738,38 +1777,9 @@ cannot allocate TLS data structures for initial thread");
|
||||
#endif
|
||||
NONTLS_INIT_TP;
|
||||
|
||||
{
|
||||
/* Initialize _r_debug. */
|
||||
struct r_debug *r = _dl_debug_initialize (GL(dl_rtld_map).l_addr);
|
||||
struct link_map *l;
|
||||
|
||||
l = GL(dl_loaded);
|
||||
|
||||
#ifdef ELF_MACHINE_DEBUG_SETUP
|
||||
|
||||
/* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
|
||||
|
||||
ELF_MACHINE_DEBUG_SETUP (l, r);
|
||||
ELF_MACHINE_DEBUG_SETUP (&GL(dl_rtld_map), r);
|
||||
|
||||
#else
|
||||
|
||||
if (l->l_info[DT_DEBUG] != NULL)
|
||||
/* There is a DT_DEBUG entry in the dynamic section. Fill it in
|
||||
with the run-time address of the r_debug structure */
|
||||
l->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
|
||||
|
||||
/* Fill in the pointer in the dynamic linker's own dynamic section, in
|
||||
case you run gdb on the dynamic linker directly. */
|
||||
if (GL(dl_rtld_map).l_info[DT_DEBUG] != NULL)
|
||||
GL(dl_rtld_map).l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
|
||||
|
||||
#endif
|
||||
|
||||
/* Notify the debugger that all objects are now mapped in. */
|
||||
r->r_state = RT_ADD;
|
||||
INTUSE(_dl_debug_state) ();
|
||||
}
|
||||
/* Notify the debugger that all objects are now mapped in. */
|
||||
r->r_state = RT_ADD;
|
||||
INTUSE(_dl_debug_state) ();
|
||||
|
||||
#ifndef MAP_COPY
|
||||
/* We must munmap() the cache file. */
|
||||
|
||||
@ -1,6 +1,6 @@
|
||||
/* Data structure for communication from the run-time dynamic linker for
|
||||
loaded ELF shared objects.
|
||||
Copyright (C) 1995-2002, 2003 Free Software Foundation, Inc.
|
||||
Copyright (C) 1995-2002, 2003, 2004 Free Software Foundation, Inc.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
@ -280,6 +280,11 @@ struct link_map
|
||||
/* Index of the module in the dtv array. */
|
||||
size_t l_tls_modid;
|
||||
#endif
|
||||
|
||||
/* Information used to change permission after the relocations are
|
||||
done. */
|
||||
ElfW(Addr) l_relro_addr;
|
||||
size_t l_relro_size;
|
||||
};
|
||||
|
||||
struct dl_phdr_info
|
||||
|
||||
Loading…
Reference in New Issue
Block a user