bminor
diff --git a/‎ChangeLog
+72 b/‎ChangeLog
+72
diff --git a/‎INSTALL
+9 b/‎INSTALL
+9
diff --git a/‎Makeconfig
+34-4 b/‎Makeconfig
+34-4
diff --git a/‎NEWS
+9 b/‎NEWS
+9
diff --git a/‎config.h.in
+3 b/‎config.h.in
+3
diff --git a/‎configure
+79 b/‎configure
+79
diff --git a/‎configure.ac
+29 b/‎configure.ac
+29
@@ -1,3 +1,75 @@
+2017-12-15  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #19574]
+	* INSTALL: Regenerated.
+	* Makeconfig (real-static-start-installed-name): New.
+	(pic-default): Updated for --enable-static-pie.
+	(pie-default): New for --enable-static-pie.
+	(default-pie-ldflag): Likewise.
+	(+link-static-before-libc): Replace $(DEFAULT-LDFLAGS-$(@F))
+	with $(if $($(@F)-no-pie),$(no-pie-ldflag),$(default-pie-ldflag)).
+	Replace $(static-start-installed-name) with
+	$(real-static-start-installed-name).
+	(+prectorT): Updated for --enable-static-pie.
+	(+postctorT): Likewise.
+	(CFLAGS-.o): Add $(pie-default).
+	(CFLAGS-.op): Likewise.
+	* NEWS: Mention --enable-static-pie.
+	* config.h.in (ENABLE_STATIC_PIE): New.
+	* configure.ac (--enable-static-pie): New configure option.
+	(have-no-dynamic-linker): New LIBC_CONFIG_VAR.
+	(have-static-pie): Likewise.
+	Enable static PIE if linker supports --no-dynamic-linker.
+	(ENABLE_STATIC_PIE): New AC_DEFINE.
+	(enable-static-pie): New LIBC_CONFIG_VAR.
+	* configure: Regenerated.
+	* csu/Makefile (omit-deps): Add r$(start-installed-name) and
+	gr$(start-installed-name) for --enable-static-pie.
+	(extra-objs): Likewise.
+	(install-lib): Likewise.
+	(extra-objs): Add static-reloc.o and static-reloc.os
+	($(objpfx)$(start-installed-name)): Also depend on
+	$(objpfx)static-reloc.o.
+	($(objpfx)r$(start-installed-name)): New.
+	($(objpfx)g$(start-installed-name)): Also depend on
+	$(objpfx)static-reloc.os.
+	($(objpfx)gr$(start-installed-name)): New.
+	* csu/libc-start.c (LIBC_START_MAIN): Call _dl_relocate_static_pie
+	in libc.a.
+	* csu/libc-tls.c (__libc_setup_tls): Add main_map->l_addr to
+	initimage.
+	* csu/static-reloc.c: New file.
+	* elf/Makefile (routines): Add dl-reloc-static-pie.
+	(elide-routines.os): Likewise.
+	(DEFAULT-LDFLAGS-tst-tls1-static-non-pie): Removed.
+	(tst-tls1-static-non-pie-no-pie): New.
+	* elf/dl-reloc-static-pie.c: New file.
+	* elf/dl-support.c (_dl_get_dl_main_map): New function.
+	* elf/dynamic-link.h (ELF_DURING_STARTUP): Also check
+	STATIC_PIE_BOOTSTRAP.
+	* elf/get-dynamic-info.h (elf_get_dynamic_info): Likewise.
+	* gmon/Makefile (tests): Add tst-gmon-static-pie.
+	(tests-static): Likewise.
+	(DEFAULT-LDFLAGS-tst-gmon-static): Removed.
+	(tst-gmon-static-no-pie): New.
+	(CFLAGS-tst-gmon-static-pie.c): Likewise.
+	(CRT-tst-gmon-static-pie): Likewise.
+	(tst-gmon-static-pie-ENV): Likewise.
+	(tests-special): Likewise.
+	($(objpfx)tst-gmon-static-pie.out): Likewise.
+	(clean-tst-gmon-static-pie-data): Likewise.
+	($(objpfx)tst-gmon-static-pie-gprof.out): Likewise.
+	* gmon/tst-gmon-static-pie.c: New file.
+	* manual/install.texi: Document --enable-static-pie.
+	* sysdeps/generic/ldsodefs.h (_dl_relocate_static_pie): New.
+	(_dl_get_dl_main_map): Likewise.
+	* sysdeps/i386/configure.ac: Check if linker supports static PIE.
+	* sysdeps/x86_64/configure.ac: Likewise.
+	* sysdeps/i386/configure: Regenerated.
+	* sysdeps/x86_64/configure: Likewise.
+	* sysdeps/mips/Makefile (ASFLAGS-.o): Add $(pie-default).
+	(ASFLAGS-.op): Likewise.
+
 2017-12-15  Joseph Myers  <joseph@codesourcery.com>
 
 	* io/Makefile (tst-open-tmpfile-ARGS): New variable.
 
@@ -86,6 +86,15 @@ will be used, and CFLAGS sets optimization options for the compiler.
      systems support shared libraries; you need ELF support and
      (currently) the GNU linker.
 
+'--enable-static-pie'
+     Enable static position independent executable (static PIE) support.
+     Static PIE is similar to static executable, but can be loaded at
+     any address without help from a dynamic linker.  All static
+     programs as well as static tests are built as static PIE, except
+     for those marked with no-pie.  The resulting glibc can be used with
+     the GCC option, -static-pie, which is available with GCC 8 or
+     above, to create static PIE.
+
 '--disable-profile'
      Don't build libraries with profiling information.  You may want to
      use this option if you don't plan to do profiling.
 
@@ -352,6 +352,14 @@ ifndef static-start-installed-name
 static-start-installed-name = $(start-installed-name)
 endif
 
+ifeq (yes,$(enable-static-pie))
+# Link with rcrt1.o, instead of crt1.o, to call _dl_relocate_static_pie
+# to relocate static PIE.
+real-static-start-installed-name = r$(static-start-installed-name)
+else
+real-static-start-installed-name = $(static-start-installed-name)
+endif
+
 ifeq (yesyes,$(build-shared)$(have-z-combreloc))
 combreloc-LDFLAGS = -Wl,-z,combreloc
 LDFLAGS.so += $(combreloc-LDFLAGS)
@@ -371,6 +379,20 @@ LDFLAGS.so += $(hashstyle-LDFLAGS)
 LDFLAGS-rtld += $(hashstyle-LDFLAGS)
 endif
 
+ifeq (yes,$(enable-static-pie))
+pic-default = -DPIC
+# Compile libc.a and libc_p.a with -fPIE/-fpie for static PIE.
+pie-default = $(pie-ccflag)
+ifeq (yes,$(have-static-pie))
+default-pie-ldflag = -static-pie
+else
+# Static PIE can't have dynamic relocations in read-only segments since
+# static PIE is mapped into memory by kernel.  --eh-frame-hdr is needed
+# for PIE to support exception.
+default-pie-ldflag = -Wl,-pie,--no-dynamic-linker,--eh-frame-hdr,-z,text
+endif
+endif
+
 # If lazy relocations are disabled, add the -z now flag.  Use
 # LDFLAGS-lib.so instead of LDFLAGS.so, to avoid adding the flag to
 # test modules.
@@ -420,9 +442,9 @@ endif
 # Command for statically linking programs with the C library.
 ifndef +link-static
 +link-static-before-libc = $(CC) -nostdlib -nostartfiles -static -o $@ \
-	      $(DEFAULT-LDFLAGS-$(@F)) \
+	      $(if $($(@F)-no-pie),$(no-pie-ldflag),$(default-pie-ldflag)) \
 	      $(sysdep-LDFLAGS) $(LDFLAGS) $(LDFLAGS-$(@F))  \
-	      $(firstword $(CRT-$(@F)) $(csu-objpfx)$(static-start-installed-name)) \
+	      $(firstword $(CRT-$(@F)) $(csu-objpfx)$(real-static-start-installed-name)) \
 	      $(+preinit) $(+prectorT) \
 	      $(filter-out $(addprefix $(csu-objpfx),start.o \
 						     $(start-installed-name))\
@@ -637,8 +659,14 @@ endif
 +prectorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginS.o`
 +postctorS = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtendS.o`
 # Variants of the two previous definitions for statically linking programs.
+ifeq (yes,$(enable-static-pie))
+# Static PIE must use PIE variants.
++prectorT = $(+prectorS)
++postctorT = $(+postctorS)
+else
 +prectorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtbeginT.o`
 +postctorT = `$(CC) $(sysdep-LDFLAGS) --print-file-name=crtend.o`
+endif
 csu-objpfx = $(common-objpfx)csu/
 elf-objpfx = $(common-objpfx)elf/
 
@@ -959,7 +987,8 @@ libtypes = $(foreach o,$(object-suffixes-for-libc),$(libtype$o))
 all-object-suffixes := .o .os .oS
 object-suffixes :=
 CPPFLAGS-.o = $(pic-default)
-CFLAGS-.o = $(filter %frame-pointer,$(+cflags))
+# libc.a must be compiled with -fPIE/-fpie for static PIE.
+CFLAGS-.o = $(filter %frame-pointer,$(+cflags)) $(pie-default)
 libtype.o := lib%.a
 object-suffixes += .o
 ifeq (yes,$(build-shared))
@@ -984,7 +1013,8 @@ ifeq (yes,$(build-profile))
 all-object-suffixes += .op
 object-suffixes += .op
 CPPFLAGS-.op = -DPROF $(pic-default)
-CFLAGS-.op = -pg
+# libc_p.a must be compiled with -fPIE/-fpie for static PIE.
+CFLAGS-.op = -pg $(pie-default)
 libtype.op = lib%_p.a
 endif
 
 
@@ -9,6 +9,15 @@ Version 2.27
 
 Major new features:
 
+* The GNU C Library can now be compiled with support for building static
+  PIE executables (See --enable-static-pie in INSTALL).  These static PIE
+  exectuables are like static executables but can be loaded at any address
+  and provide additional security hardening benefits at the cost of some
+  memory and performance.  When the library is built with --enable-static-pie
+  the resulting libc.a is usable with GCC 8 and above to create static PIE
+  executables using the GCC option '-static-pie'.  This feature is currently
+  supported on i386, x86_64 and x32.
+
 * Optimized x86-64 asin, atan2, exp, expf, log, pow, atan, sin, cosf,
   sinf and tan with FMA, contributed by Arjan van de Ven and H.J. Lu
   from Intel.
 
@@ -238,6 +238,9 @@
 /* Build glibc with tunables support.  */
 #define HAVE_TUNABLES 0
 
+/* Define if static PIE is enabled.  */
+#define ENABLE_STATIC_PIE 0
+
 /* Some compiler options may now allow to use ebp in __asm__ (used mainly
    in i386 6 argument syscall issue).  */
 #define CAN_USE_REGISTER_ASM_EBP 0
 
@@ -763,6 +763,7 @@ with_default_link
 enable_sanity_checks
 enable_shared
 enable_profile
+enable_static_pie
 enable_timezone_tools
 enable_hardcoded_path_in_tests
 enable_stackguard_randomization
@@ -1417,6 +1418,8 @@ Optional Features:
                           in special situations) [default=yes]
   --enable-shared         build shared library [default=yes if GNU ld]
   --enable-profile        build profiled library [default=no]
+  --enable-static-pie     enable static PIE support and use it in the
+                          testsuite [default=no]
   --disable-timezone-tools
                           do not install timezone tools [default=install]
   --enable-hardcoded-path-in-tests
@@ -3350,6 +3353,13 @@ else
   profile=no
 fi
 
+# Check whether --enable-static-pie was given.
+if test "${enable_static_pie+set}" = set; then :
+  enableval=$enable_static_pie; static_pie=$enableval
+else
+  static_pie=no
+fi
+
 # Check whether --enable-timezone-tools was given.
 if test "${enable_timezone_tools+set}" = set; then :
   enableval=$enable_timezone_tools; enable_timezone_tools=$enableval
@@ -5806,6 +5816,62 @@ fi
 $as_echo "$libc_linker_feature" >&6; }
 
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker that supports --no-dynamic-linker" >&5
+$as_echo_n "checking for linker that supports --no-dynamic-linker... " >&6; }
+libc_linker_feature=no
+if test x"$gnu_ld" = x"yes"; then
+  libc_linker_check=`$LD -v --help 2>/dev/null | grep "\--no-dynamic-linker"`
+  if test -n "$libc_linker_check"; then
+    cat > conftest.c <<EOF
+int _start (void) { return 42; }
+EOF
+    if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
+				-Wl,--no-dynamic-linker -nostdlib -nostartfiles
+				-fPIC -shared -o conftest.so conftest.c
+				1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+      libc_linker_feature=yes
+    fi
+    rm -f conftest*
+  fi
+fi
+if test $libc_linker_feature = yes; then
+  libc_cv_no_dynamic_linker=yes
+else
+  libc_cv_no_dynamic_linker=no
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5
+$as_echo "$libc_linker_feature" >&6; }
+config_vars="$config_vars
+have-no-dynamic-linker = $libc_cv_no_dynamic_linker"
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for -static-pie" >&5
+$as_echo_n "checking for -static-pie... " >&6; }
+if ${libc_cv_static_pie+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if { ac_try='${CC-cc} -static-pie -xc /dev/null -S -o /dev/null'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }; then :
+  libc_cv_static_pie=yes
+else
+  libc_cv_static_pie=no
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie" >&5
+$as_echo "$libc_cv_static_pie" >&6; }
+config_vars="$config_vars
+have-static-pie = $libc_cv_static_pie"
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for -fpie" >&5
 $as_echo_n "checking for -fpie... " >&6; }
 if ${libc_cv_fpie+:} false; then :
@@ -6705,6 +6771,19 @@ $as_echo "$libc_cv_pie_default" >&6; }
 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
 
 
+if test "$static_pie" = yes; then
+  # The linker must support --no-dynamic-linker.
+  if test "$libc_cv_no_dynamic_linker" != yes; then
+    as_fn_error $? "linker support for --no-dynamic-linker needed" "$LINENO" 5
+  fi
+  # Default to PIE.
+  libc_cv_pie_default=yes
+  $as_echo "#define ENABLE_STATIC_PIE 1" >>confdefs.h
+
+fi
+config_vars="$config_vars
+enable-static-pie = $static_pie"
+
 
 
 
 
@@ -170,6 +170,11 @@ AC_ARG_ENABLE([profile],
 			     [build profiled library @<:@default=no@:>@]),
 	      [profile=$enableval],
 	      [profile=no])
+AC_ARG_ENABLE([static-pie],
+	      AC_HELP_STRING([--enable-static-pie],
+			     [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
+	      [static_pie=$enableval],
+	      [static_pie=no])
 AC_ARG_ENABLE([timezone-tools],
 	      AC_HELP_STRING([--disable-timezone-tools],
 			     [do not install timezone tools @<:@default=install@:>@]),
@@ -1287,6 +1292,19 @@ LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
 		    [libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
 AC_SUBST(libc_cv_z_execstack)
 
+LIBC_LINKER_FEATURE([--no-dynamic-linker],
+		    [-Wl,--no-dynamic-linker],
+		    [libc_cv_no_dynamic_linker=yes],
+		    [libc_cv_no_dynamic_linker=no])
+LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
+
+AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
+LIBC_TRY_CC_OPTION([-static-pie],
+		   [libc_cv_static_pie=yes],
+		   [libc_cv_static_pie=no])
+])
+LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
+
 AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
 LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
 ])
@@ -1794,6 +1812,17 @@ AC_SUBST(libc_cv_pie_default)
 libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
 AC_SUBST(libc_cv_multidir)
 
+if test "$static_pie" = yes; then
+  # The linker must support --no-dynamic-linker.
+  if test "$libc_cv_no_dynamic_linker" != yes; then
+    AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
+  fi
+  # Default to PIE.
+  libc_cv_pie_default=yes
+  AC_DEFINE(ENABLE_STATIC_PIE)
+fi
+LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
+
 AC_SUBST(profile)
 AC_SUBST(static_nss)