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This patch is based on the following upstream commit:
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commit 2d6ab5df3b675e96ee587ae6a8c2ce004c6b1ba9
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Mar 2 14:44:28 2017 +0100
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Document and fix --enable-bind-now [BZ #21015]
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diff --git a/INSTALL b/INSTALL
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index 82b29f5d8746f929..230be71b9d0821c2 100644
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--- a/INSTALL
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+++ b/INSTALL
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@@ -143,6 +143,12 @@ will be used, and CFLAGS sets optimization options for the compiler.
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`--enable-lock-elision=yes'
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Enable lock elision for pthread mutexes by default.
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+'--enable-bind-now'
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+ Disable lazy binding for installed shared objects. This provides
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+ additional security hardening because it enables full RELRO and a
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+ read-only global offset table (GOT), at the cost of slightly
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+ increased program load times.
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+
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`--disable-werror'
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By default, the GNU C Library is built with `-Werror'. If you wish
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to build without this option (for example, if building with a newer
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diff --git a/Makeconfig b/Makeconfig
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index f8313c9774d47522..1ad9b6f0d494c027 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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@@ -384,6 +384,13 @@ LDFLAGS.so += $(hashstyle-LDFLAGS)
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LDFLAGS-rtld += $(hashstyle-LDFLAGS)
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endif
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+# If lazy relocations are disabled, add the -z now flag. Use
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+# LDFLAGS-lib.so instead of LDFLAGS.so, to avoid adding the flag to
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+# test modules.
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+ifeq ($(bind-now),yes)
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+LDFLAGS-lib.so += -Wl,-z,now
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+endif
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+
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# Additional libraries to link into every test.
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link-extra-libs-tests = $(libsupport)
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diff --git a/Makerules b/Makerules
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index 9bd7d603fc28a4de..50fe7e48187f0e68 100644
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--- a/Makerules
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+++ b/Makerules
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@@ -477,7 +477,7 @@ $(LINK.o) -shared $(static-libgcc) -Wl,-O1 $(sysdep-LDFLAGS) \
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$(extra-B-$(@F:lib%.so=%).so) -B$(csu-objpfx) \
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$(extra-B-$(@F:lib%.so=%).so) $(load-map-file) \
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-Wl,-soname=lib$(libprefix)$(@F:lib%.so=%).so$($(@F)-version) \
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- $(LDFLAGS.so) $(LDFLAGS-$(@F:lib%.so=%).so) \
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+ $(LDFLAGS.so) $(LDFLAGS-lib.so) $(LDFLAGS-$(@F:lib%.so=%).so) \
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-L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link)
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endef
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@@ -938,7 +938,8 @@ $(common-objpfx)format.lds: $(..)scripts/output-format.sed \
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ifneq (unknown,$(output-format))
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echo > $@.new 'OUTPUT_FORMAT($(output-format))'
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else
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- $(LINK.o) -shared $(sysdep-LDFLAGS) $(config-LDFLAGS) $(LDFLAGS.so) \
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+ $(LINK.o) -shared $(sysdep-LDFLAGS) $(config-LDFLAGS) \
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+ $(LDFLAGS.so) $(LDFLAGS-lib.so) \
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-x c /dev/null -o $@.so -Wl,--verbose -v 2>&1 \
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| sed -n -f $< > $@.new
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test -s $@.new
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diff --git a/iconvdata/Makefile b/iconvdata/Makefile
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index 7930dcd49d77c818..ddb2dc6a3c6500c8 100644
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--- a/iconvdata/Makefile
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+++ b/iconvdata/Makefile
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@@ -65,6 +65,10 @@ modules.so := $(addsuffix .so, $(modules))
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include ../Makeconfig
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+ifeq ($(bind-now),yes)
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+LDFLAGS.so += -Wl,-z,now
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+endif
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+
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ifeq (yes,$(build-shared))
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tests = bug-iconv1 bug-iconv2 tst-loading tst-e2big tst-iconv4 bug-iconv4 \
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tst-iconv6 bug-iconv5 bug-iconv6 tst-iconv7 bug-iconv8 bug-iconv9 \
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diff --git a/manual/install.texi b/manual/install.texi
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index 3799cee621ddc4f9..47d832cc59bc695e 100644
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--- a/manual/install.texi
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+++ b/manual/install.texi
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@@ -160,6 +160,12 @@ so that they can be invoked directly.
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@item --enable-lock-elision=yes
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Enable lock elision for pthread mutexes by default.
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+@item --enable-bind-now
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+Disable lazy binding for installed shared objects. This provides
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+additional security hardening because it enables full RELRO and a
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+read-only global offset table (GOT), at the cost of slightly increased
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+program load times.
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+
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@pindex pt_chown
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@findex grantpt
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@item --enable-pt_chown
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