Josh Hoffer
e641f37499
The stub copies the embedded kernel PE into an xmalloc_pages() allocation with AllocateAnyPages, which only guarantees EFI_PAGE_SIZE (4 KiB) alignment. The arm64 kernel declares SectionAlignment = SZ_64K. When _text is not 64K-aligned the kernel's EFI stub reallocates and copies the image, which can fail with EFI_OUT_OF_RESOURCES on memory-constrained firmware (e.g. U-Boot, bounded by CONFIG_SYS_MALLOC_LEN rather than full DRAM). The failure is non-deterministic since AllocateAnyPages returns whatever page the allocator finds first. Plumb SectionAlignment through pe_kernel_info() and allocate via xmalloc_aligned_pages(). For alignment <= EFI_PAGE_SIZE (e.g. x86_64) it reduces to a plain AllocatePages(), so the change is free there. SectionAlignment comes from the PE header, which the spec requires to be a power of 2. Sanitize it in pe_kernel_info() right where it is parsed: a non-conforming value falls back to plain page alignment (matching the behavior of older systemd-stub versions that ignored the field) rather than propagate something that would break xmalloc_aligned_pages()'s over-alignment maths, with a log_warning() so the fallback stays diagnosable. Co-developed-by: Claude <claude@anthropic.com> Closes: #42443 Reported-By: Agathe Porte <agathe.porte@oss.qualcomm.com> Tested-By: Agathe Porte <agathe.porte@oss.qualcomm.com>
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