This is the ARM counterpart of the changes now in v4.12 to clean up the PE/COFF header that makes the kernel zImage loadable directly from UEFI, and to enhance it with hardening and debug features. First of all, the cleanup consists of making the header comply with the PE/COFF spec (#1), removing the .reloc section (#2) and replacing all open coded constants with #defines from linux/pe.h Patch #4 is a standalone patch that removes ksymtab/kcrctab sections that may get pulled in inadvertently when the decompressor is built with EFI support. Note that these sections are tiny and harmless by themselves, but the linker may dump them in unexpected places if they are not placed explicitly, which may interfere with the image layout. This is especially important when signing zImages for UEFI secure boot. Patch #5 changes the description of the decompressor in memory, so that the UEFI firmware can apply strict ro/nx protections, resulting in a more secure execution environment for the UEFI stub. Patch #6 splits the decompressor .start and .text output sections, so that the ELF view aligns with the PE/COFF view of the binary. This is useful for debugging, but has no other benefits (or downsides, for that matter) Patch #7 enhances the decompressor binary with a NB10 Codeview debug entry referring to the path to arch/arm/boot/compressed/vmlinux on the build host. This is another debug feature that allows seamless source level single step debugging of the UEFI stub while executing in the context of the firmware. Ard Biesheuvel (7): arm: efi: remove forbidden values from the PE/COFF header arm: efi: remove pointless dummy .reloc section arm: efi: replace open coded constants with symbolic ones arm: compressed: discard ksymtab/kcrctab sections arm: efi: split zImage code and data into separate PE/COFF sections arm: compressed: put zImage header and EFI header in dedicated section arm: efi: add PE/COFF debug table to EFI header arch/arm/boot/compressed/Makefile | 4 + arch/arm/boot/compressed/efi-header.S | 247 ++++++++++++-------- arch/arm/boot/compressed/vmlinux.lds.S | 39 +++- 3 files changed, 180 insertions(+), 110 deletions(-) -- 2.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
