add cheri article

articles/morello/code/Makefile

@@ -0,0 +1,22 @@
+CFLAGS += -Wall -g -fno-stack-protector
+CC ?= clang
+PURECAP_CC ?= ~/cheri/output/sdk/utils/cheribsd-riscv64-purecap-clang
+
+SOURCES := $(wildcard *.c)
+OBJECTS := $(patsubst %.c, %, $(SOURCES))
+OBJECTS_CHERIBSD := $(patsubst %.c, %-cheribsd, $(SOURCES))
+
+all: all-host all-cheribsd
+
+all-host: $(OBJECTS) 
+
+all-cheribsd: $(OBJECTS_CHERIBSD) 
+
+%: %.c
+	$(CC) $< $(CFLAGS) -o $@
+
+%-cheribsd: %.c
+	$(PURECAP_CC) $< $(CFLAGS) -o $@
+
+clean:
+	rm $(OBJECTS) $(OBJECTS_CHERIBSD) 

articles/morello/code/membug.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+int main() {
+    char my_perfect_string[] = "what a beautiful string"; // so beautiful, I sure hope no-one touches it
+    char user_name[32];
+
+    printf("enter your name: ");
+    fgets(user_name, 1000, stdin); // get user's name from stdin
+    printf("hello %s", user_name);
+    printf("my_perfect_string: %s\n", my_perfect_string);
+
+    return 0;
+}

articles/morello/code/ptrs_as_numbers.c

@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main() {
+    int magic = 9999;
+    (void)magic;
+    int arr[] = { 1234, 5678 };
+
+    int *x = &(arr[0]); // x is a pointer to first element of arr
+    printf("*x=%d\n", *x);
+
+    unsigned long x_addr = (size_t) x; // we're going to assume size_t = unsigned long here
+    x_addr += 4; // sizeof(int) == 4
+    x = (int *) x_addr;
+    printf("*x=%d\n", *x);
+
+    x_addr += 4;
+    x = (int *) x_addr;
+    printf("*x=%d\n", *x);
+
+    return 0;
+}

articles/morello/code/sizes.c

@@ -0,0 +1,7 @@
+#include <stdio.h>
+
+int main () {
+    printf("void *: %lu, size_t: %lu\n", sizeof(void *), sizeof(size_t));
+
+    return 0;
+}