liblaunch: implement private/shared mapping support

lib/liblaunch/elf.c

@@ -233,6 +233,7 @@ static enum launch_status map_executable(struct elf_image *image)
 
 		kern_handle_t vmo = image->e_image;
 		vm_prot_t prot = VM_PROT_USER;
+		vm_flags_t flags = VM_SHARED;
 		size_t offset = phdr.p_offset;
 
 		phdr.p_flags & PF_R && (prot |= VM_PROT_READ);
@@ -240,6 +241,7 @@ static enum launch_status map_executable(struct elf_image *image)
 		phdr.p_flags & PF_X && (prot |= VM_PROT_EXEC);
 		if (phdr.p_flags & PF_W) {
 			vmo = image->e_data;
+			flags = VM_PRIVATE;
 			offset = data_offset;
 			size_t tmp = 0;
 
@@ -267,6 +269,7 @@ static enum launch_status map_executable(struct elf_image *image)
 				vmo,
 				offset,
 				phdr.p_memsz,
+				flags,
 				prot,
 				NULL);
 		}
@@ -282,6 +285,7 @@ static enum launch_status map_executable(struct elf_image *image)
 				vmo,
 				offset,
 				phdr.p_memsz,
+				flags,
 				prot,
 				NULL);
 		}

lib/liblaunch/launch.c

@@ -183,6 +183,7 @@ enum launch_status launch_ctx_execute(
 		stack_vmo,
 		0,
 		STACK_SIZE,
+		VM_PRIVATE,
 		VM_PROT_READ | VM_PROT_WRITE | VM_PROT_USER,
 		&remote_stack_buf);
 	kstatus = address_space_map(
@@ -191,6 +192,7 @@ enum launch_status launch_ctx_execute(
 		stack_vmo,
 		0,
 		STACK_SIZE,
+		VM_PRIVATE,
 		VM_PROT_READ | VM_PROT_WRITE | VM_PROT_USER,
 		&local_stack_buf);
 	kern_handle_close(stack_vmo);