[PATCH v4 4/5] ARM: decompressor: move GOT into .data for EFI enabled builds
From: Ard Biesheuvel <ardb@kernel.org>
Date: 2020-05-19 16:28:12
Also in:
linux-efi
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
We will be running the decompressor in place after a future patch, instead of copying it around first. This means we no longer have to disable and re-enable the MMU and caches either. However, this means we will be loaded with the restricted permissions set by the UEFI firmware, which means that we have to move the GOT table into the data section in order for the contents to be writable by the code itself. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Nicolas Pitre <nico@fluxnic.net> --- arch/arm/boot/compressed/vmlinux.lds.S | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
index b247f399de71..d0619ec05705 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S@@ -63,9 +63,11 @@ SECTIONS _etext = .; .got.plt : { *(.got.plt) } +#ifndef CONFIG_EFI_STUB _got_start = .; .got : { *(.got) } _got_end = .; +#endif /* ensure the zImage file size is always a multiple of 64 bits */ /* (without a dummy byte, ld just ignores the empty section) */
@@ -74,6 +76,9 @@ SECTIONS #ifdef CONFIG_EFI_STUB .data : ALIGN(4096) { __pecoff_data_start = .; + _got_start = .; + *(.got) + _got_end = .; /* * The EFI stub always executes from RAM, and runs strictly before the * decompressor, so we can make an exception for its r/w data, and keep it
--
2.17.1
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