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

Signed-off-by: Jinen Gandhi <[email protected]>

.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

@@ -2,3 +2,4 @@
 /install/
 /ltp*.xml
 /pal_loader
+/PATCH_APPLIED

LibOS/shim/test/ltp/Makefile

@@ -21,8 +21,16 @@ $(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)
+	patch -p1 -l < ltp_sgx_mmap_fix.patch
+	touch $@
+
 .SECONDARY: $(BUILDDIR)/BUILD_SUCCESS
-$(BUILDDIR)/BUILD_SUCCESS: $(SRCDIR)/configure
+$(BUILDDIR)/BUILD_SUCCESS: $(SRCDIR)/configure $(if $(SGX), $(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)
@@ -71,4 +79,4 @@ ltp-sgx.xml: CFG = ltp.cfg ltp-sgx.cfg ltp-bug-1075.cfg
 .PHONY: clean-build
 clean-build:
 	$(MAKE) -C $(SRCDIR) clean
-	$(RM) -r $(BUILDDIR) $(INSTALLDIR) ltp*.xml
+	$(RM) -r $(BUILDDIR) $(INSTALLDIR) ltp*.xml PATCH_APPLIED