✨feat: allow binary exec and improve documentation

- Added new shellcode payloads for exec-argv1 and exec-bin-sh for amd64, i386, and aarch64 architectures.
- Introduced a backup feature for the su binary before overwriting it.
- Enhanced README.md with usage instructions and details about affected kernels.
- Added build-n-print.sh script for building and printing payloads in hex format.

payloads/build-n-print.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+
+# Check for nasm
+if ! command -v nasm &> /dev/null; then
+    echo "[!] nasm could not be found. Please install it."
+    exit 1
+fi
+
+# Check for python3
+if ! command -v python3 &> /dev/null; then
+    echo "[!] python3 could not be found. Please install it."
+    exit 1
+fi
+
+for payload in *.asm; do
+    echo "[+] Building $payload"
+    nasm -f bin $payload -o ${payload%.asm}
+    echo "[+] Printing $payload as hex"
+    cat ${payload%.asm} | python3 -c 'import sys, zlib; print(zlib.compress(sys.stdin.buffer.read()).hex())'
+done
+
+# Check for aarch64-linux-gnu-as
+if ! command -v aarch64-linux-gnu-as &> /dev/null; then
+    echo "[!] aarch64-linux-gnu-as could not be found. Please install binutils-aarch64-linux-gnu"
+    exit 1
+fi
+
+for payload in *.S; do
+    # Assemble the source into an object file
+    echo "[+] Building $payload"
+    aarch64-linux-gnu-as $payload -o ${payload%.S}.o
+    # Extract ONLY the raw bytes into a flat binary file
+    echo "[+] Extracting $payload as binary"
+    aarch64-linux-gnu-objcopy -O binary ${payload%.S}.o ${payload%.S}
+    echo "[+] Printing $payload as hex"
+    cat ${payload%.S} | python3 -c 'import sys, zlib; print(zlib.compress(sys.stdin.buffer.read()).hex())'
+done