release: Add security/export checks to gitian and fix current failures

- fix parsing of BIND_NOW with older readelf
- add _IO_stdin_used to ignored exports

For details see: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109

- add check-symbols and check-security make targets

These are not added to the default checks because some of them depend on
release-build configs.

- always link librt for glibc back-compat builds

glibc absorbed clock_gettime in 2.17. librt (its previous location) is safe to
link in anyway for back-compat.

Fixes #7420

- add security/symbol checks to gitian

Github-Pull: #7424
Rebased-From: cd27bf51e06a8d79790a631696355bd05751b0aa 475813ba5b208eb9a5d027eb628a717cc123ef4f f3d3eaf78eb51238d799d8f20a585550d1567719 a8ce872118c4807465629aecb9e4f3d72d999ccb a81c87fafce43e49cc2307947e3951b84be7ca9a

7 files changed, 34 insertions, 7 deletions

diff --git a/Makefile.am b/Makefile.am
index b2b7811729..0a3b00bcc7 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -26,6 +26,9 @@ OSX_QT_TRANSLATIONS = da,de,es,hu,ru,uk,zh_CN,zh_TW
 
 DIST_DOCS = $(wildcard doc/*.md) $(wildcard doc/release-notes/*.md)
 
+BIN_CHECKS=$(top_srcdir)/contrib/devtools/symbol-check.py \
+           $(top_srcdir)/contrib/devtools/security-check.py
+
 WINDOWS_PACKAGING = $(top_srcdir)/share/pixmaps/bitcoin.ico \
   $(top_srcdir)/share/pixmaps/nsis-header.bmp \
   $(top_srcdir)/share/pixmaps/nsis-wizard.bmp \
@@ -213,7 +216,7 @@ endif
 
 dist_noinst_SCRIPTS = autogen.sh
 
-EXTRA_DIST = $(top_srcdir)/share/genbuild.sh qa/pull-tester/rpc-tests.py qa/rpc-tests $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING)
+EXTRA_DIST = $(top_srcdir)/share/genbuild.sh qa/pull-tester/rpc-tests.py qa/rpc-tests $(DIST_DOCS) $(WINDOWS_PACKAGING) $(OSX_PACKAGING) $(BIN_CHECKS)
 
 CLEANFILES = $(OSX_DMG) $(BITCOIN_WIN_INSTALLER)
 
diff --git a/configure.ac b/configure.ac
index d0381a36ef..8b1c375cc3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -64,6 +64,8 @@ AC_PATH_PROG([GIT], [git])
 AC_PATH_PROG(CCACHE,ccache)
 AC_PATH_PROG(XGETTEXT,xgettext)
 AC_PATH_PROG(HEXDUMP,hexdump)
+AC_PATH_TOOL(READELF, readelf)
+AC_PATH_TOOL(CPPFILT, c++filt)
 
 dnl pkg-config check.
 PKG_PROG_PKG_CONFIG
@@ -409,6 +411,10 @@ AX_GCC_FUNC_ATTRIBUTE([dllimport])
 
 if test x$use_glibc_compat != xno; then
 
+  #glibc absorbed clock_gettime in 2.17. librt (its previous location) is safe to link
+  #in anyway for back-compat.
+  AC_CHECK_LIB([rt],[clock_gettime],, AC_MSG_ERROR(lib missing))
+
   #__fdelt_chk's params and return type have changed from long unsigned int to long int.
   # See which one is present here.
   AC_MSG_CHECKING(__fdelt_chk type)
@@ -422,7 +428,8 @@ if test x$use_glibc_compat != xno; then
     [ fdelt_type="long int"])
   AC_MSG_RESULT($fdelt_type)
   AC_DEFINE_UNQUOTED(FDELT_TYPE, $fdelt_type,[parameter and return value type for __fdelt_chk])
-
+else
+  AC_SEARCH_LIBS([clock_gettime],[rt])
 fi
 
 if test x$TARGET_OS != xwindows; then
@@ -489,8 +496,6 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <sys/socket.h>]],
  [ AC_MSG_RESULT(no)]
 )
 
-AC_SEARCH_LIBS([clock_gettime],[rt])
-
 AC_MSG_CHECKING([for visibility attribute])
 AC_LINK_IFELSE([AC_LANG_SOURCE([
   int foo_def( void ) __attribute__((visibility("default")));
@@ -900,6 +905,7 @@ AM_CONDITIONAL([USE_LCOV],[test x$use_lcov = xyes])
 AM_CONDITIONAL([USE_COMPARISON_TOOL],[test x$use_comparison_tool != xno])
 AM_CONDITIONAL([USE_COMPARISON_TOOL_REORG_TESTS],[test x$use_comparison_tool_reorg_test != xno])
 AM_CONDITIONAL([GLIBC_BACK_COMPAT],[test x$use_glibc_compat = xyes])
+AM_CONDITIONAL([HARDEN],[test x$use_hardening = xyes])
 
 AC_DEFINE(CLIENT_VERSION_MAJOR, _CLIENT_VERSION_MAJOR, [Major version])
 AC_DEFINE(CLIENT_VERSION_MINOR, _CLIENT_VERSION_MINOR, [Minor version])
diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index e96eaa9c38..01586457db 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -94,7 +94,7 @@ def check_ELF_RELRO(executable):
         raise IOError('Error opening file')
     for line in stdout.split('\n'):
         tokens = line.split()
-        if len(tokens)>1 and tokens[1] == '(BIND_NOW)':
+        if len(tokens)>1 and tokens[1] == '(BIND_NOW)' or (len(tokens)>2 and tokens[1] == '(FLAGS)' and 'BIND_NOW' in tokens[2]):
             have_bindnow = True
     return have_gnu_relro and have_bindnow
 
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
index 93acfcdda4..4ad5136f79 100755
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -42,9 +42,12 @@ MAX_VERSIONS = {
 'GLIBCXX': (3,4,13),
 'GLIBC':   (2,11)
 }
+# See here for a description of _IO_stdin_used:
+# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=634261#109
+
 # Ignore symbols that are exported as part of every executable
 IGNORE_EXPORTS = {
-'_edata', '_end', '_init', '__bss_start', '_fini'
+'_edata', '_end', '_init', '__bss_start', '_fini', '_IO_stdin_used'
 }
 READELF_CMD = os.getenv('READELF', '/usr/bin/readelf')
 CPPFILT_CMD = os.getenv('CPPFILT', '/usr/bin/c++filt')
diff --git a/contrib/gitian-descriptors/gitian-linux.yml b/contrib/gitian-descriptors/gitian-linux.yml
index d13ae8b10c..d034a91303 100644
--- a/contrib/gitian-descriptors/gitian-linux.yml
+++ b/contrib/gitian-descriptors/gitian-linux.yml
@@ -96,6 +96,8 @@ script: |
 
     ./configure --prefix=${BASEPREFIX}/${i} --bindir=${INSTALLPATH}/bin --includedir=${INSTALLPATH}/include --libdir=${INSTALLPATH}/lib --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS}
     make ${MAKEOPTS}
+    make ${MAKEOPTS} -C src check-security
+    make ${MAKEOPTS} -C src check-symbols
     make install-strip
     cd installed
     find . -name "lib*.la" -delete
diff --git a/contrib/gitian-descriptors/gitian-win.yml b/contrib/gitian-descriptors/gitian-win.yml
index 66077e0d5b..bcc6c4629e 100644
--- a/contrib/gitian-descriptors/gitian-win.yml
+++ b/contrib/gitian-descriptors/gitian-win.yml
@@ -126,6 +126,7 @@ script: |
 
     ./configure --prefix=${BASEPREFIX}/${i} --bindir=${INSTALLPATH}/bin --includedir=${INSTALLPATH}/include --libdir=${INSTALLPATH}/lib --disable-ccache --disable-maintainer-mode --disable-dependency-tracking ${CONFIGFLAGS}
     make ${MAKEOPTS}
+    make ${MAKEOPTS} -C src check-security
     make deploy
     make install-strip
     cp -f bitcoin-*setup*.exe $OUTDIR/
diff --git a/src/Makefile.am b/src/Makefile.am
index 5d7fbb13d2..4c12e550b4 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -76,7 +76,7 @@ if BUILD_BITCOIN_UTILS
   bin_PROGRAMS += bitcoin-cli bitcoin-tx
 endif
 
-.PHONY: FORCE
+.PHONY: FORCE check-symbols check-security
 # bitcoin core #
 BITCOIN_CORE_H = \
   addrman.h \
@@ -458,6 +458,18 @@ clean-local:
 	$(AM_V_CXX) $(OBJCXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	  $(CPPFLAGS) $(AM_CXXFLAGS) $(QT_INCLUDES) $(AM_CXXFLAGS) $(PIE_FLAGS) $(CXXFLAGS) -c -o $@ $<
 
+check-symbols: $(bin_PROGRAMS)
+if GLIBC_BACK_COMPAT
+	@echo "Checking glibc back compat..."
+	$(AM_V_at) READELF=$(READELF) CPPFILT=$(CPPFILT) $(top_srcdir)/contrib/devtools/symbol-check.py < $(bin_PROGRAMS)
+endif
+
+check-security: $(bin_PROGRAMS)
+if HARDEN
+	@echo "Checking binary security..."
+	$(AM_V_at) READELF=$(READELF) OBJDUMP=$(OBJDUMP) $(top_srcdir)/contrib/devtools/security-check.py < $(bin_PROGRAMS)
+endif
+
 %.pb.cc %.pb.h: %.proto
 	@test -f $(PROTOC)
 	$(AM_V_GEN) $(PROTOC) --cpp_out=$(@D) --proto_path=$(abspath $(<D) $<)