diff --git a/src/Makefile b/src/Makefile
index 1879c686..35b5f537 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -12,19 +12,19 @@ BUILD_USE_DEPEND    ?= 1
 MAKEFLAGS += -r
 .SUFFIXES:
 export SHELL = /bin/sh
-override e = $($1) $(EXTRA_$1) $(upx_$1) $(upx_EXTRA_$1) $($(basename $(notdir $@)).$1)
+override ee = $($1) $(EXTRA_$1) $(upx_$1) $(upx_EXTRA_$1) $($(basename $(notdir $@)).$1)
 
 ifndef srcdir
-srcdir := $(dir $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST)))
-srcdir := $(shell echo '$(srcdir)' | sed 's,/*$$,,')
+srcdir := $(dir $(lastword $(MAKEFILE_LIST)))
+srcdir := $(shell echo '$(srcdir)' | sed 's,/*$$,,' || echo 'ERROR')
 endif
 ifndef top_srcdir
 top_srcdir := $(srcdir)/..
 endif
 include $(wildcard $(top_srcdir)/Makevars.global ./Makevars.local)
 ifneq ($(srcdir),.)
-##$(info Info: using VPATH . $(srcdir))
-VPATH := . $(srcdir)
+vpath %.cpp .:$(srcdir)
+vpath %.h   .:$(srcdir)
 endif
 
 # toolchain
@@ -75,9 +75,8 @@ CXXFLAGS += $(CXXFLAGS_WERROR)
 ifeq ($(BUILD_TYPE_SANITIZE),1)
 CXXFLAGS_SANITIZE ?= -fsanitize=address,undefined -fno-omit-frame-pointer -DACC_CFG_NO_UNALIGNED
 CXXFLAGS += $(CXXFLAGS_SANITIZE)
-LDFLAGS  += $(CXXFLAGS_SANITIZE)
 # these are the only 2 objects that are actually speed-sensitive
-compress_lzma$(objext) filteri$(objext) : CXXFLAGS_SANITIZE =
+compress_lzma$(objext) filteri$(objext) : override CXXFLAGS_SANITIZE =
 endif
 
 # rules
@@ -86,20 +85,20 @@ all: upx$(exeext) | ./.depend
 
 upx$(exeext): $(upx_OBJECTS) $(upx_DEPENDENCIES)
 	$($(notdir $@).PRE_LINK_STEP)
-	$(strip $(CXXLD) $(call e,CPPFLAGS) $(call e,CXXFLAGS) $(call e,LDFLAGS) -o $@ $(upx_OBJECTS) $(call e,LDADD) $(call e,LIBS))
+	$(strip $(CXXLD) $(call ee,CXXFLAGS) $(call ee,LDFLAGS) -o $@ $(upx_OBJECTS) $(call ee,LDADD) $(call ee,LIBS))
 	$($(notdir $@).POST_LINK_STEP)
 	$(CHECK_WHITESPACE)
 
 %.o : %.cpp | ./.depend
-	$(strip $(CXX) $(call e,CPPFLAGS) $(call e,CXXFLAGS) -o $@ -c $<)
+	$(strip $(CXX) $(call ee,CPPFLAGS) $(call ee,CXXFLAGS) -o $@ -c $<)
 %.cpp.ii : %.cpp
-	$(strip $(CXX) $(call e,CPPFLAGS) $(call e,CXXFLAGS) -o $@ -E $<)
+	$(strip $(CXX) $(call ee,CPPFLAGS) $(call ee,CXXFLAGS) -o $@ -E $<)
 
 ifeq ($(BUILD_USE_DEPEND),1)
 ./.depend: $(sort $(wildcard $(srcdir)/*.cpp $(srcdir)/*.h)) $(MAKEFILE_LIST)
 	@rm -f $@
 	@echo "Updating $@"
-	@$(strip $(CXX) $(call e,CPPFLAGS) -MM) $(filter %.cpp,$^) > $@
+	@$(strip $(CXX) $(call ee,CPPFLAGS) -MM) $(filter %.cpp,$^) > $@
 else
 ./.depend:
 .PHONY: ./.depend
@@ -115,16 +114,14 @@ check-whitespace : ; $(CHECK_WHITESPACE)
 endif
 .PHONY: check-whitespace
 
+mostlyclean clean distclean maintainer-clean:
+	rm -f *.d *.map *.o *.obj *.res ./.depend upx.exe upx.out upx.ttp upx$(exeext)
 
-./.depend compress_lzma$(objext) : INCLUDES += -I$(UPX_LZMADIR)
+./.depend compress_lzma$(objext) : override INCLUDES += -I$(UPX_LZMADIR)
 
 compress_lzma$(objext) : CXXFLAGS += -Wno-shadow
 p_mach$(objext)        : CXXFLAGS += -Wno-cast-align
 
-
-mostlyclean clean distclean maintainer-clean:
-	rm -f *.d *.map *.o *.obj *.res ./.depend upx.exe upx.out upx.ttp upx$(exeext)
-
 .PHONY: all mostlyclean clean distclean maintainer-clean
 
 ifeq ($(MAKECMDGOALS),mostlyclean)
@@ -140,11 +137,9 @@ endif
 help$(objext): $(MAKEFILE_LIST)
 endif
 
-
 # "make run-testsuite"
-#
 # search for the UPX testsuite -- git clone https://github.com/upx/upx-testsuite.git
-# you also can set upx_testsuite_SRCDIR
+# you also can override upx_testsuite_SRCDIR
 ifndef upx_testsuite_SRCDIR
 # search standard locations below $(top_srcdir)
 ifneq ($(wildcard $(top_srcdir)/../upx-testsuite.git/files/packed/.),)
@@ -165,7 +160,6 @@ run-testsuite: ./upx$(exeext)
 endif
 endif
 
-
 # automatically format some C++ source code files
 ifeq ($(shell uname),Linux)
 CLANG_FORMAT_FILES += packhead.cpp
diff --git a/src/compress_lzma.cpp b/src/compress_lzma.cpp
index b277565a..7fd1bef9 100644
--- a/src/compress_lzma.cpp
+++ b/src/compress_lzma.cpp
@@ -783,7 +783,7 @@ int upx_lzma_test_overlap  ( const upx_bytep buf,
         return UPX_E_ERROR;
     // NOTE: there is a very tiny possibility that decompression has
     //   succeeded but the data is not restored correctly because of
-    //   in-place buffer overlapping.
+    //   in-place buffer overlapping, so we use an extra memcmp().
     if (tbuf != NULL && memcmp(tbuf, b, *dst_len) != 0)
         return UPX_E_ERROR;
     return UPX_E_OK;
diff --git a/src/compress_zlib.cpp b/src/compress_zlib.cpp
index 94beec6c..543725a6 100644
--- a/src/compress_zlib.cpp
+++ b/src/compress_zlib.cpp
@@ -211,7 +211,7 @@ int upx_zlib_test_overlap  ( const upx_bytep buf,
         return UPX_E_ERROR;
     // NOTE: there is a very tiny possibility that decompression has
     //   succeeded but the data is not restored correctly because of
-    //   in-place buffer overlapping.
+    //   in-place buffer overlapping, so we use an extra memcmp().
     if (tbuf != NULL && memcmp(tbuf, b, *dst_len) != 0)
         return UPX_E_ERROR;
     return UPX_E_OK;
@@ -236,10 +236,12 @@ const char *upx_zlib_version_string(void)
     return zlibVersion();
 }
 
+#if 0 /* UNUSED */
 unsigned upx_zlib_adler32(const void *buf, unsigned len, unsigned adler)
 {
     return adler32(adler, (const Bytef *) buf, len);
 }
+#endif
 
 #if 0 /* UNUSED */
 unsigned upx_zlib_crc32(const void *buf, unsigned len, unsigned crc)
diff --git a/src/conf.h b/src/conf.h
index 9db19dda..3725036e 100644
--- a/src/conf.h
+++ b/src/conf.h
@@ -163,6 +163,13 @@ typedef unsigned char   upx_byte;
 #undef NDEBUG
 #include <assert.h>
 
+// protect against integer overflows and malicious header fields
+// see C 11 standard, Annex K
+typedef size_t upx_rsize_t;
+#define UPX_RSIZE_MAX       UPX_RSIZE_MAX_MEM
+#define UPX_RSIZE_MAX_MEM   (768 * 1024 * 1024)   // DO NOT CHANGE
+#define UPX_RSIZE_MAX_STR   (1024 * 1024)
+
 
 /*************************************************************************
 // portab
diff --git a/src/mem.cpp b/src/mem.cpp
index 84721e2f..52977382 100644
--- a/src/mem.cpp
+++ b/src/mem.cpp
@@ -35,41 +35,43 @@
 // and malicious header fields
 **************************************************************************/
 
-// DO NOT CHANGE
-#define MAX_BUF_SIZE (768 * 1024 * 1024)
-ACC_COMPILE_TIME_ASSERT_HEADER(2ull * MAX_BUF_SIZE * 9 / 8 + 16*1024*1024 < INT_MAX)
+ACC_COMPILE_TIME_ASSERT_HEADER(UPX_RSIZE_MAX_MEM == UPX_RSIZE_MAX)
+ACC_COMPILE_TIME_ASSERT_HEADER(UPX_RSIZE_MAX_STR <= UPX_RSIZE_MAX / 256)
+ACC_COMPILE_TIME_ASSERT_HEADER(2ull * UPX_RSIZE_MAX * 9 / 8 + 16*1024*1024 < INT_MAX)
 
-size_t mem_size(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra)
+upx_rsize_t mem_size(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1, upx_uint64_t extra2)
 {
     assert(element_size > 0);
-    if (element_size > MAX_BUF_SIZE) throwCantPack("mem_size 1; take care");
-    if (n > MAX_BUF_SIZE) throwCantPack("mem_size 2; take care");
-    if (extra > MAX_BUF_SIZE) throwCantPack("mem_size 3; take care");
-    upx_uint64_t bytes = element_size * n + extra; // cannot overflow
-    if (bytes > MAX_BUF_SIZE) throwCantPack("mem_size 4; take care");
-    return ACC_ICONV(size_t, bytes);
+    if (element_size > UPX_RSIZE_MAX) throwCantPack("mem_size 1; take care");
+    if (n > UPX_RSIZE_MAX) throwCantPack("mem_size 2; take care");
+    if (extra1 > UPX_RSIZE_MAX) throwCantPack("mem_size 3; take care");
+    if (extra2 > UPX_RSIZE_MAX) throwCantPack("mem_size 4; take care");
+    upx_uint64_t bytes = element_size * n + extra1 + extra2; // cannot overflow
+    if (bytes > UPX_RSIZE_MAX) throwCantPack("mem_size 5; take care");
+    return ACC_ICONV(upx_rsize_t, bytes);
 }
 
-size_t mem_size_get_n(upx_uint64_t element_size, upx_uint64_t n)
+upx_rsize_t mem_size_get_n(upx_uint64_t element_size, upx_uint64_t n)
 {
     mem_size_assert(element_size, n);
-    return ACC_ICONV(size_t, n);        // return n
+    return ACC_ICONV(upx_rsize_t, n);        // return n
 }
 
-bool mem_size_valid(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra)
+bool mem_size_valid(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1, upx_uint64_t extra2)
 {
     assert(element_size > 0);
-    if (element_size > MAX_BUF_SIZE) return false;
-    if (n > MAX_BUF_SIZE) return false;
-    if (extra > MAX_BUF_SIZE) return false;
-    upx_uint64_t bytes = element_size * n + extra; // cannot overflow
-    if (bytes > MAX_BUF_SIZE) return false;
+    if (element_size > UPX_RSIZE_MAX) return false;
+    if (n > UPX_RSIZE_MAX) return false;
+    if (extra1 > UPX_RSIZE_MAX) return false;
+    if (extra2 > UPX_RSIZE_MAX) return false;
+    upx_uint64_t bytes = element_size * n + extra1 + extra2; // cannot overflow
+    if (bytes > UPX_RSIZE_MAX) return false;
     return true;
 }
 
 bool mem_size_valid_bytes(upx_uint64_t bytes)
 {
-    if (bytes > MAX_BUF_SIZE) return false;
+    if (bytes > UPX_RSIZE_MAX) return false;
     return true;
 }
 
@@ -86,8 +88,6 @@ int ptr_diff(const char *p1, const char *p2)
     return ACC_ICONV(int, d);
 }
 
-#undef MAX_BUF_SIZE
-
 
 /*************************************************************************
 // bool use_simple_mcheck()
diff --git a/src/pefile.cpp b/src/pefile.cpp
index 7539e163..0f1bce79 100644
--- a/src/pefile.cpp
+++ b/src/pefile.cpp
@@ -1609,7 +1609,7 @@ PeFile::Resource::upx_rnode *PeFile::Resource::convert(const void *rnode,
     branch->name = NULL;
     branch->parent = parent;
     branch->nc = ic;
-    branch->children = new upx_rnode*[ic];
+    branch->children = New(upx_rnode *, ic);
     branch->data = *node;
 
     for (const res_dir_entry *rde = node->entries + ic - 1; --ic >= 0; rde--)
diff --git a/src/snprintf.cpp b/src/snprintf.cpp
index 3d2a73e7..ae84d7c0 100644
--- a/src/snprintf.cpp
+++ b/src/snprintf.cpp
@@ -744,15 +744,12 @@ static size_t dopr(char *buffer, size_t maxsize, const char *format, va_list arg
 // public entries
 **************************************************************************/
 
-// protect against integer overflows and malicious header fields
-#define MAX_STR_SIZE (1024 * 1024)
-
 // UPX version with assertions
 int upx_vsnprintf(char *str, size_t count, const char *format, va_list ap) {
     size_t size;
 
     // preconditions
-    assert(count <= MAX_STR_SIZE);
+    assert(count <= UPX_RSIZE_MAX_STR);
     if (str != NULL)
         assert(count > 0);
     else
@@ -762,7 +759,7 @@ int upx_vsnprintf(char *str, size_t count, const char *format, va_list ap) {
 
     // postconditions
     assert(size > 0);
-    assert(size <= MAX_STR_SIZE);
+    assert(size <= UPX_RSIZE_MAX_STR);
     if (str != NULL) {
         assert(size <= count);
         assert(str[size - 1] == '\0');
@@ -809,14 +806,13 @@ int __acc_cdecl_va upx_asprintf(char **ptr, const char *format, ...) {
 }
 
 #undef strlen
-size_t upx_strlen(const char *s) {
+upx_rsize_t upx_strlen(const char *s) {
+    assert(s != NULL);
     size_t len = strlen(s);
-    assert(len < MAX_STR_SIZE);
+    assert(len < UPX_RSIZE_MAX_STR);
     return len;
 }
 
-#undef MAX_STR_SIZE
-
 /*************************************************************************
  //
 **************************************************************************/
diff --git a/src/snprintf.h b/src/snprintf.h
index 8abaced6..a795577c 100644
--- a/src/snprintf.h
+++ b/src/snprintf.h
@@ -44,7 +44,7 @@ int __acc_cdecl_va upx_asprintf (char **ptr, const char *format, ...);
 #undef sprintf
 #define sprintf error_sprintf_is_dangerous_use_snprintf
 
-size_t upx_strlen(const char *);
+upx_rsize_t upx_strlen(const char *);
 
 #undef strlen
 #define strlen upx_strlen
diff --git a/src/stub/i386-darwin.macho-upxmain.exe b/src/stub/i386-darwin.macho-upxmain.exe
old mode 100755
new mode 100644
diff --git a/src/stub/scripts/check_whitespace.sh b/src/stub/scripts/check_whitespace.sh
index c10fcda7..996116e4 100755
--- a/src/stub/scripts/check_whitespace.sh
+++ b/src/stub/scripts/check_whitespace.sh
@@ -30,7 +30,7 @@ LC_ALL=C sort -z | xargs -0r perl -n -e '
        if ($ARGV =~ m,(^|/)\.gitmodules$,) { }
        elsif ($ARGV =~ m,(^|/)(gnu|m)?make(file|vars),i) { }
        elsif ($ARGV =~ m,/tmp/.*\.(disasm|dump)$,) { }
-       elsif ($ARGV =~ m,/src/stub/src/arch/.*\.S$,) { }
+       elsif ($ARGV =~ m,/src/stub/src/arch/.*/lzma.*\.S$,) { }
        else { print "ERROR: hard TAB detected $ARGV: $_"; exit(1); }
     }
 ' || exit 1
diff --git a/src/stub/scripts/check_whitespace_git.sh b/src/stub/scripts/check_whitespace_git.sh
index 7caed2c3..69765e50 100755
--- a/src/stub/scripts/check_whitespace_git.sh
+++ b/src/stub/scripts/check_whitespace_git.sh
@@ -27,7 +27,7 @@ git ls-files --full-name -z | perl -0 -n -e '
        if ($ARGV =~ m,(^|/)\.gitmodules$,) { }
        elsif ($ARGV =~ m,(^|/)(gnu|m)?make(file|vars),i) { }
        elsif ($ARGV =~ m,/tmp/.*\.(disasm|dump)$,) { }
-       elsif ($ARGV =~ m,/src/stub/src/arch/.*\.S$,) { }
+       elsif ($ARGV =~ m,/src/stub/src/arch/.*/lzma.*\.S$,) { }
        else { print "ERROR: hard TAB detected $ARGV: $_"; exit(1); }
     }
 ' || exit 1
diff --git a/src/util.h b/src/util.h
index 9d8aff74..0f1aebf2 100644
--- a/src/util.h
+++ b/src/util.h
@@ -60,14 +60,17 @@ int mem_replace(void *b, int blen, const void *what, int wlen, const void *r);
 // protect against integer overflows and malicious header fields
 **************************************************************************/
 
-size_t mem_size(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra = 0);
-size_t mem_size_get_n(upx_uint64_t element_size, upx_uint64_t n);
+upx_rsize_t mem_size(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1 = 0,
+                     upx_uint64_t extra2 = 0);
+upx_rsize_t mem_size_get_n(upx_uint64_t element_size, upx_uint64_t n);
 
-inline void mem_size_assert(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra = 0) {
-    (void) mem_size(element_size, n, extra); // sanity check
+inline void mem_size_assert(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1 = 0,
+                            upx_uint64_t extra2 = 0) {
+    (void) mem_size(element_size, n, extra1, extra2); // sanity check
 }
 
-bool mem_size_valid(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra = 0);
+bool mem_size_valid(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1 = 0,
+                    upx_uint64_t extra2 = 0);
 bool mem_size_valid_bytes(upx_uint64_t bytes);
 
 #define New(type, n) new type[mem_size_get_n(sizeof(type), n)]