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efi_loader: Fix loaded image alignment

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We are ignoring the alignment communicated via the PE/COFF header.
Starting 5.10 the Linux kernel will loudly complain about it. For more
details look at [1] (in linux kernel).

So add a function that can allocate aligned EFI memory and use it for our
relocated loaded image.

[1] c32ac11da3f83 ("efi/libstub: arm64: Double check image alignment at entry")

Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Tested-by: Vincent Stehlé <vincent.stehle@arm.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Ilias Apalodimas 2021-10-11 15:10:23 +03:00 • committed by Heinrich Schuchardt
parent fa00b6fc3f
commit ebdea88d57
3 changed files with 60 additions and 6 deletions
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2
include/efi_loader.h
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@ -675,6 +675,8 @@ struct efi_device_path *efi_get_dp_from_boot(const efi_guid_t guid);
#define efi_size_in_pages(size) (((size) + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
/* Generic EFI memory allocator, call this to get memory */
void *efi_alloc(uint64_t len, int memory_type);
/* Allocate pages on the specified alignment */
void *efi_alloc_aligned_pages(u64 len, int memory_type, size_t align);
/* More specific EFI memory allocator, called by EFI payloads */
efi_status_t efi_allocate_pages(enum efi_allocate_type type,
enum efi_memory_type memory_type,