have a makefile

Makefile

@@ -0,0 +1,9 @@
+DATA = $(word 1,$(wildcard ./data ../data))
+include $(DATA)/Makefile.common
+OBJS = check_sanity make_kernel_patchfile apply_patchfile
+all: .settings $(OBJS)
+%: %.c
+	make -C $(DATA)
+	$(GCC) $(CFLAGS) -o $@ $< -I$(DATA) $(DATA)/libdata.a
+clean:
+	rm -f $(OBJS)

apply_patchfile.c

@@ -3,6 +3,7 @@
 #include <assert.h>
 
 int main(int argc, char **argv) {
+    (void) argc;
     struct binary binary;
     b_init(&binary);
     mode_t mode;

check_sanity.c

@@ -0,0 +1,34 @@
+#include <data/common.h>
+#include <data/binary.h>
+#include <data/loader.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+int main(int argc, char **argv) {
+    if(argc != 2) {
+        fprintf(stderr, "Usage: check_sanity macho\n");
+        exit(1);
+    }
+    struct binary binary;
+    b_init(&binary);
+    b_load_macho(&binary, argv[1], false);
+    int result = 0;
+    CMD_ITERATE(binary.mach_hdr, cmd) {
+        if(cmd->cmd == LC_SEGMENT) {
+            struct segment_command *seg = (void *) cmd;
+            uint32_t start = seg->vmaddr;
+            uint32_t end = seg->vmaddr + seg->vmsize;
+
+            struct section *sections = (void *) (seg + 1);
+            for(uint32_t i = 0; i < seg->nsects; i++) {
+                struct section *sect = &sections[i];
+                if(!(start <= sect->addr && sect->addr <= end && \
+                     start <= (sect->addr + sect->size) && (sect->addr + sect->size) <= end)) {
+                        printf("insane: segment %.16s section %d is out of bounds (vmaddr:%x vmsize:%x addr:%x size:%x)\n", seg->segname, i, seg->vmaddr, seg->vmsize, sect->addr, sect->size);
+                        result = 1;
+                }
+            }
+        }
+    }
+    return result;
+}

make_kernel_patchfile.c

@@ -174,6 +174,7 @@ void do_kernel(struct binary *binary, struct binary *sandbox) {
 
 
 int main(int argc, char **argv) {
+    (void) argc;
     struct binary kernel, sandbox;
     b_init(&kernel);
     b_init(&sandbox);