Add UnZip static PIE build

Co-authored-by: Jumarea Stefan <[email protected]>

Signed-off-by: anindya_sen <[email protected]>

unzip/README.md

@@ -0,0 +1,22 @@
+# Build unzip as static PIE
+
+Build the [unzip](https://infozip.sourceforge.net/UnZip.html) application as static PIE ELF running on Linux.
+
+## Requirements
+
+Make sure the following packages are installed:
+
+* GCC
+* GNU Make
+
+## Build
+
+The `unzip` static PIE ELF file is located in the current directory.
+In order to rebuild it you have to run the `build.sh` bash script.
+The `build.sh` script will download, extract, patch and build the code to generate the static PIE unzip binary.
+
+## Running
+
+```bash
+./unzip extract.zip
+```

unzip/build.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+APP=unzip
+DIR=${APP}60
+ARCHIVE=${DIR}.tar.gz
+URL=https://downloads.sourceforge.net/infozip/${ARCHIVE}
+
+# Clean up
+rm -rf ${ARCHIVE}
+rm -rf ${DIR}
+
+echo -n "Downloading ${APP} sources ... "
+wget -q ${URL}
+if test $? -ne 0; then
+    echo ""
+    echo "Unable to download ${APP} from ${URL}"
+    exit 1
+fi
+echo "DONE"
+
+echo ""
+echo -n "Unpacking ${APP} ... "
+tar -zxvf ${ARCHIVE}
+if test $? -ne 0; then
+    echo ""
+    echo "Unable to extract ${APP}"
+    exit 1
+fi
+echo "DONE"
+
+echo ""
+echo -n "Building ${APP} ... "
+echo ""
+pushd ${DIR} > /dev/null 2>&1 || exit 1
+
+patch -p1 < ../patches/add-static-pie-flag.patch
+make -f unix/Makefile generic
+
+popd > /dev/null 2>&1 || exit 1
+
+cp ${DIR}/${APP} .
+
+rm -rf ${DIR}
+rm -rf ${ARCHIVE}
+
+echo -n "Build complete!"

unzip/patches/add-static-pie-flag.patch

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+diff --git a/unix/Makefile b/unix/Makefile
+index ab32270..e00aa7b 100644
+--- a/unix/Makefile
++++ b/unix/Makefile
+@@ -53,6 +53,7 @@ CF = $(CFLAGS) $(CF_NOOPT)
+ LFLAGS1 =
+ LF = -o unzip$E $(LFLAGS1)
+ LF2 = -s
++LDFLAGS = -static-pie -static-libgcc
+
+ # UnZipSFX flags
+ SL = -o unzipsfx$E $(LFLAGS1)
+@@ -280,13 +281,13 @@ unzipsdocs:	unzips docs
+ # make utilities if default:  change "unzip$E:" to "unzip$E:&"
+
+ unzip$E:	$(OBJS) $(LIBBZ2)	# add `&' for parallel makes
+-	$(LD) $(LF) -L$(IZ_BZIP2) $(LOBJS) $(L_BZ2) $(LF2)
++	$(LD) $(LF) -L$(IZ_BZIP2) $(LOBJS) $(L_BZ2) $(LF2) $(LDFLAGS)
+
+ unzipsfx$E:	$(OBJX)			# add `&' for parallel makes
+-	$(LD) $(SL) $(LOBJX) $(SL2)
++	$(LD) $(SL) $(LOBJX) $(SL2) $(LDFLAGS)
+
+ funzip$E:	$(OBJF)			# add `&' for parallel makes
+-	$(LD) $(FL) $(OBJF) $(FL2)
++	$(LD) $(FL) $(OBJF) $(FL2) $(LDFLAGS)
+
+ zipinfo$E:	unzip$E			# `&' is pointless here...
+ 	@echo\

unzip/rootfs/tesfile1

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+This is a testfile used for compression using zip.