[PATCH 3/4] Disable lazy binding by default

[Siddhesh Poyarekar]

Lazy binding is a key security feature and is enabled by all major
distributions by default.  Default to this more secure option and flip
the flag to allow disabling it if needed.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
---
 INSTALL             | 10 +++++-----
 NEWS                |  3 +++
 configure           |  4 ++--
 configure.ac        |  6 +++---
 manual/install.texi |  9 ++++-----
 5 files changed, 17 insertions(+), 15 deletions(-)

diff --git a/INSTALL b/INSTALL
index f02358e933..88ffe7748f 100644
--- a/INSTALL
+++ b/INSTALL
@@ -205,11 +205,11 @@ if ‘CFLAGS’ is specified it must enable optimization.  For example:
      of routines called directly from assembler are excluded from this
      protection.  This option is enabled by default and set to ‘strong’.
 
-‘--enable-bind-now’
-     Disable lazy binding for installed shared objects and programs.
-     This provides additional security hardening because it enables full
-     RELRO and a read-only global offset table (GOT), at the cost of
-     slightly increased program load times.
+‘--disable-bind-now’
+     Enable lazy binding for installed shared objects and programs.
+     Lazy binding may improve program load times but it will disable
+     security hardening that enables full RELRO and a read-only global
+     offset table (GOT).
 
 ‘--enable-pt_chown’
      The file ‘pt_chown’ is a helper binary for ‘grantpt’ (*note
diff --git a/NEWS b/NEWS
index 47ec0b741c..264fad5d86 100644
--- a/NEWS
+++ b/NEWS
@@ -52,6 +52,9 @@ Major new features:
   default.  This may be overridden by using the --enable-stack-protector
   configure option.
 
+* Lazy binding is now disabled by default and can be overridden with the
+  --disable-bind-now configure flag.
+
 Deprecated and removed features, and other changes affecting compatibility:
 
 * In the Linux kernel for the hppa/parisc architecture some of the
diff --git a/configure b/configure
index 863621cabf..6d4b05df18 100755
--- a/configure
+++ b/configure
@@ -1462,7 +1462,7 @@ Optional Features:
                           hardcode newly built glibc path in tests
                           [default=no]
   --disable-hidden-plt    do not hide internal function calls to avoid PLT
-  --enable-bind-now       disable lazy relocations in DSOs
+  --disable-bind-now      enable lazy relocations in DSOs
   --enable-stack-protector=[yes|no|all|strong]
                           Use -fstack-protector[-all|-strong] to detect glibc
                           buffer overflows
@@ -4448,7 +4448,7 @@ if test ${enable_bind_now+y}
 then :
   enableval=$enable_bind_now; bindnow=$enableval
 else $as_nop
-  bindnow=no
+  bindnow=yes
 fi
 
 
diff --git a/configure.ac b/configure.ac
index d85452b3b3..6fc72df700 100644
--- a/configure.ac
+++ b/configure.ac
@@ -213,10 +213,10 @@ if test "x$hidden" = xno; then
 fi
 
 AC_ARG_ENABLE([bind-now],
-	      AS_HELP_STRING([--enable-bind-now],
-			     [disable lazy relocations in DSOs]),
+	      AS_HELP_STRING([--disable-bind-now],
+			     [enable lazy relocations in DSOs]),
 	      [bindnow=$enableval],
-	      [bindnow=no])
+	      [bindnow=yes])
 AC_SUBST(bindnow)
 if test "x$bindnow" = xyes; then
   AC_DEFINE(BIND_NOW)
diff --git a/manual/install.texi b/manual/install.texi
index b1aa5eb60c..ae43dc51ac 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -231,11 +231,10 @@ options to detect stack overruns.  Only the dynamic linker and a small
 number of routines called directly from assembler are excluded from this
 protection.  This option is enabled by default and set to @option{strong}.
 
-@item --enable-bind-now
-Disable lazy binding for installed shared objects and programs.  This
-provides additional security hardening because it enables full RELRO
-and a read-only global offset table (GOT), at the cost of slightly
-increased program load times.
+@item --disable-bind-now
+Enable lazy binding for installed shared objects and programs.  Lazy binding
+may improve program load times but it will disable security hardening that
+enables full RELRO and a read-only global offset table (GOT).
 
 @pindex pt_chown
 @findex grantpt
-- 
2.41.0