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commit 94a4e9e4f401ffe829a992820439977ead0a0ce7
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Author: Florian Weimer <fweimer@redhat.com>
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Date: Thu Apr 25 10:41:43 2019 +0200
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Extend BIND_NOW to installed programs with --enable-bind-now
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Commit 2d6ab5df3b675e96ee587ae6a8c2ce004c6b1ba9 ("Document and fix
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--enable-bind-now [BZ #21015]") extended BIND_NOW to all installed
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shared objects. This change also covers installed programs.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/INSTALL b/INSTALL
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index d6c8e899fbb47dac..d56e102ec9ed3281 100644
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--- a/INSTALL
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+++ b/INSTALL
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@@ -169,10 +169,10 @@ if 'CFLAGS' is specified it must enable optimization. For example:
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protection.
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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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+ Disable lazy binding for installed shared objects and programs.
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+ This provides additional security hardening because it enables full
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+ RELRO and a read-only global offset table (GOT), at the cost of
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+ slightly increased program load times.
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'--enable-pt_chown'
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The file 'pt_chown' is a helper binary for 'grantpt' (*note
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diff --git a/Makeconfig b/Makeconfig
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index 8dc2fec9dc683416..742c0c0783a14bfa 100644
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--- a/Makeconfig
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+++ b/Makeconfig
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@@ -398,6 +398,8 @@ endif
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# test modules.
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ifeq ($(bind-now),yes)
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LDFLAGS-lib.so += -Wl,-z,now
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+# Extra flags for dynamically linked non-test main programs.
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+link-extra-flags += -Wl,-z,now
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endif
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# Command to run after every final link (executable or shared object).
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@@ -426,7 +428,7 @@ ifndef +link-pie
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$(link-extra-libs)
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+link-pie-after-libc = $(+postctorS) $(+postinit)
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define +link-pie
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-$(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-pie-after-libc)
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+$(+link-pie-before-libc) $(rtld-LDFLAGS) $(link-extra-flags) $(link-libc) $(+link-pie-after-libc)
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$(call after-link,$@)
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endef
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define +link-pie-tests
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@@ -454,7 +456,7 @@ ifndef +link-static
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$(link-extra-libs-static)
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+link-static-after-libc = $(+postctorT) $(+postinit)
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define +link-static
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-$(+link-static-before-libc) $(link-libc-static) $(+link-static-after-libc)
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+$(+link-static-before-libc) $(link-extra-flags) $(link-libc-static) $(+link-static-after-libc)
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$(call after-link,$@)
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endef
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define +link-static-tests
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@@ -485,7 +487,7 @@ else # not build-pie-default
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$(link-extra-libs)
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+link-after-libc = $(+postctor) $(+postinit)
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define +link
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-$(+link-before-libc) $(rtld-LDFLAGS) $(link-libc) $(+link-after-libc)
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+$(+link-before-libc) $(rtld-LDFLAGS) $(link-extra-flags) $(link-libc) $(+link-after-libc)
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$(call after-link,$@)
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endef
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define +link-tests
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diff --git a/manual/install.texi b/manual/install.texi
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index e757891dc2eebb2e..351d67c68b255f62 100644
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--- a/manual/install.texi
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+++ b/manual/install.texi
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@@ -199,10 +199,10 @@ number of routines called directly from assembler are excluded from this
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protection.
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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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+Disable lazy binding for installed shared objects and programs. This
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+provides additional security hardening because it enables full RELRO
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+and a read-only global offset table (GOT), at the cost of slightly
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+increased program load times.
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@pindex pt_chown
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@findex grantpt
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