x86: boot: Fix EFI stub alignment

We currently align the end of the compressed image to a multiple of
16. However the PE-COFF header included in the EFI stub says that the file alignment is 32 bytes, and when adding an EFI signature to the file it must first be padded to this alignment.

sbsigntool commands warn about this:

warning: file-aligned section .text extends beyond end of file
warning: checksum areas are greater than image size. Invalid section table?

Worse, pesign-at least when creating a detached signature—uses the hash of the unpadded file, resulting in an invalid signature if padding is required.

Avoid both these problems by increasing alignment to 32 bytes when CONFIG_EFI_STUB is enabled.

Signed-off-by Ben Hutchings <[email protected]>

---

arch/x86/boot/tools/build.c +7 -0

@@ -391,6 +391,13 @@ int main(int argc, char ** argv)
                die("Unable to mmap '%s': %m", argv[2]);
        /* Number of 16-byte paragraphs, including space for a 4-byte CRC */
        sys_size = (sz + 15 + 4) / 16;
+#ifdef CONFIG_EFI_STUB
+       /*
+        * COFF requires minimum 32-byte alignment of sections, and
+        * adding a signature is problematic without that alignment.
+        */
+       sys_size = (sys_size + 1) & ~1;
+#endif
 
        /* Patch the setup code with the appropriate size parameters */
        buf[0x1f1] = setup_sectors-1;