[CI] LTP: Add MAP_PRIVATE patch to LTP sources and enable LTP in SGX CI

.ci/lib/stage-test-sgx.jenkinsfile

@@ -1,4 +1,16 @@
 stage('test-sgx') {
+    timeout(time: 45, unit: 'MINUTES') {
+        try {
+            sh '''
+                cd LibOS/shim/test/ltp
+                make ${MAKEOPTS} all sgx-tokens
+                make ltp-sgx.xml
+            '''
+        } finally {
+            archiveArtifacts 'LibOS/shim/test/ltp/ltp-sgx.xml'
+            junit 'LibOS/shim/test/ltp/ltp-sgx.xml'
+        }
+    }
     timeout(time: 5, unit: 'MINUTES') {
         sh '''
             cd Examples/python-simple

.gitmodules

@@ -1,3 +1,4 @@
 [submodule "LibOS/shim/test/ltp/src"]
 	path = LibOS/shim/test/ltp/src
 	url = https://github.com/linux-test-project/ltp.git
+	ignore = dirty

LibOS/shim/test/ltp/.gitignore

@@ -1,4 +1,5 @@
-/build/
-/install/
+/build*/
+/install*/
 /ltp*.xml
 /pal_loader
+/PATCH_APPLIED

LibOS/shim/test/ltp/Makefile

@@ -21,8 +21,24 @@ $(SRCDIR)/Makefile:
 $(SRCDIR)/configure: $(SRCDIR)/Makefile
 	$(MAKE) -C $(SRCDIR) autotools
 
+.SECONDARY: $(ROOTDIR)/PATCH_APPLIED
+$(ROOTDIR)/PATCH_APPLIED:
+	# To run LTP tests with SGX (which doesn't support shared memory mappings),
+	# as a workaround we change the mmap flag from MAP_SHARED to MAP_PRIVATE
+	# (unintuitively, the LTP framework still works correctly with this change)
+	# No such change is intended for LTP tests with non-SGX.
+	$(eval export patch-status = $(shell patch -p1 -l -N -s --dry-run < ltp_sgx_mmap_fix.patch 1>&2 2> /dev/null; echo $$?))
+	@if [ $(SGX) = 1 -a $(patch-status) = 0 ] ; then \
+		patch -p1 -l < ltp_sgx_mmap_fix.patch; \
+		touch $@; \
+	else \
+		if [ $(SGX) = 0 -a $(patch-status) = 1 ]; then \
+			patch -R -s -f -i ltp_sgx_mmap_fix.patch src/lib/tst_test.c; \
+		fi; \
+	fi
+
 .SECONDARY: $(BUILDDIR)/BUILD_SUCCESS
-$(BUILDDIR)/BUILD_SUCCESS: $(SRCDIR)/configure
+$(BUILDDIR)/BUILD_SUCCESS: $(SRCDIR)/configure $(ROOTDIR)/PATCH_APPLIED
 	# Out-of-tree build steps were taken from ltp/INSTALL.
 	# The instructions below assume that SRCDIR and BUILDDIR are absolute.
 	mkdir -p $(BUILDDIR)
@@ -53,7 +69,7 @@ sgx-tokens: build-manifest
 
 .PHONY: regression
 regression:
-ifeq ($(SGX),"1")
+ifeq ($(SGX),1)
 	$(RM) ltp-sgx.xml
 	$(MAKE) ltp-sgx.xml
 else
@@ -66,9 +82,9 @@ ltp-sgx.xml: CFG = ltp.cfg ltp-sgx.cfg ltp-bug-1075.cfg
 
 %.xml: $(CFG) $(target) $(INSTALLDIR)/INSTALL_SUCCESS
 	./contrib/conf_lint.py $(CFG) --scenario $(LTPSCENARIO)
-	./runltp_xml.py $(RUNLTPOPTS) $(foreach cfg,$(CFG),-c $(cfg)) $(LTPSCENARIO) -O $@
+	./runltp_xml.py $(RUNLTPOPTS) $(foreach cfg,$(CFG),-c $(cfg)) $(LTPSCENARIO) -o ltproot=$(LTPROOT) -O $@
 
 .PHONY: clean-build
 clean-build:
 	$(MAKE) -C $(SRCDIR) clean
-	$(RM) -r $(BUILDDIR) $(INSTALLDIR) ltp*.xml
+	$(RM) -r build* install* ltp*.xml PATCH_APPLIED