Unable to build unified kernel on Ubuntu 20.10 aarch64

[zmanji]

On the latest Ubuntu release (20.10) I did the following:

1. Install all of the build dependencies.
2. Built the boot stub by running:

cmake -GNinja -DLOADER_TARGET=aarch64 ..
ninja

3. Tried to build the image with build_image like this:

./zloader/build/tools/build_image -o foo-unsigned.efi -s ./zloader/build/zloaderaa64.efi.stub -l /boot/vmlinux-5.13.0-19-generic -i /boot/initrd.img-5.13.0-19-generic -c ./cmdline.txt -O /etc/os-release 

The above step fails with:

build_image: /root/zloader/tools/build_image.c:468: int main(int, char **): Assertion `filesize < mem.size' failed.

The following files are located in the attached zips for your reference:

• The built zloaderaa64.efi.stub
• The kernel image vmlinux-5.13.0-19-generic
• The initrd initrd.img-5.13.0-19-generic
• The cmdline cmdline.txt
• The os-release file os-release

rest.zip
kernel.zip
initrd.zip

[zmanji]

Note

With the following patch:

diff --git a/src/util.h b/src/util.h
index ca6620b..d297a28 100644
--- a/src/util.h
+++ b/src/util.h
@@ -65,16 +65,12 @@ struct aligned_buffer {
 
 static __always_inline inline
 uint8_t* buffer_pos(simple_buffer_t buffer) {
-    assert(buffer->buffer);
-    assert(buffer->pos < buffer->allocated);
 
     return (uint8_t*) buffer->buffer + buffer->pos;
 }
 
 static __always_inline inline
 size_t buffer_len(simple_buffer_t buffer) {
-    assert(buffer->buffer);
-    assert(buffer->pos < buffer->length);
 
     return buffer->length - buffer->pos;
 }
diff --git a/tools/build_image.c b/tools/build_image.c
index bfc6a82..70cba94 100644
--- a/tools/build_image.c
+++ b/tools/build_image.c
@@ -465,7 +465,7 @@ int main(int argc, char* argv[]) {
         largest_vma = ALIGN_VALUE(section->virtual_address + section->virtual_size, section_alignment);
         largest_raw_address += section->size_of_raw_data;
         filesize += section->size_of_raw_data;
-        assert(filesize < mem.size);
+        assert(filesize <= mem.size);
     }
 
     if (!silent) {

I was able to successfully create a unified kernel. This kernel was discovered by systemd-boot and booted properly.

I had to remove the asserts in util.h otherwise the stub would fail on those asserts.