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The .data.rel.ro.local section has the same semantics as .data.rel.ro
here, so include it in the .rodata section of the decompressor.
Additionally since the .printk_index section isn't usable outside of
the core kernel, discard it in the decompressor. Avoids these warnings:
arm-linux-gnueabi-ld: warning: orphan section `.data.rel.ro.local' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.data.rel.ro.local'
arm-linux-gnueabi-ld: warning: orphan section `.printk_index' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.printk_index'
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/linux-mm/202209080545.qMIVj7YM-lkp@intel.com
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Kees Cook <keescook@chromium.org>
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Pull ARM updates from Russell King:
- handle inexact watchpoint addresses (Douglas Anderson)
- decompressor serial debug cleanups (Linus Walleij)
- update L2 cache prefetch bits (Guillaume Tucker)
- add text offset and malloc size to the decompressor kexec data
* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
ARM: add malloc size to decompressor kexec size structure
ARM: add TEXT_OFFSET to decompressor kexec image structure
ARM: 9007/1: l2c: fix prefetch bits init in L2X0_AUX_CTRL using DT values
ARM: 9010/1: uncompress: Print the location of appended DTB
ARM: 9009/1: uncompress: Enable debug in head.S
ARM: 9008/1: uncompress: Drop excess whitespace print
ARM: 9006/1: uncompress: Wait for ready and busy in debug prints
ARM: 9005/1: debug: Select flow control for all debug UARTs
ARM: 9004/1: debug: Split waituart to CTS and TXRDY
ARM: 9003/1: uncompress: Delete unused debug macros
ARM: 8997/2: hw_breakpoint: Handle inexact watchpoint addresses
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Add the required malloc size to the decompressor kexec size structure.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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Add the TEXT_OFFSET to the decompressor's kexec image structure to
kexec knows what offset to use.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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In preparation for warning on orphan sections, use common macros for
debug sections, discards, and text stubs. Add discards for unwanted .note,
and .rel sections.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Link: https://lore.kernel.org/r/20200821194310.3089815-21-keescook@chromium.org
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Pull ARM updates from Russell King:
- remove a now unnecessary usage of the KERNEL_DS for
sys_oabi_epoll_ctl()
- update my email address in a number of drivers
- decompressor EFI updates from Ard Biesheuvel
- module unwind section handling updates
- sparsemem Kconfig cleanups
- make act_mm macro respect THREAD_SIZE
* tag 'for-linus' of git://git.armlinux.org.uk/~rmk/linux-arm:
ARM: 8980/1: Allow either FLATMEM or SPARSEMEM on the multiplatform build
ARM: 8979/1: Remove redundant ARCH_SPARSEMEM_DEFAULT setting
ARM: 8978/1: mm: make act_mm() respect THREAD_SIZE
ARM: decompressor: run decompressor in place if loaded via UEFI
ARM: decompressor: move GOT into .data for EFI enabled builds
ARM: decompressor: defer loading of the contents of the LC0 structure
ARM: decompressor: split off _edata and stack base into separate object
ARM: decompressor: move headroom variable out of LC0
ARM: 8976/1: module: allow arch overrides for .init section names
ARM: 8975/1: module: fix handling of unwind init sections
ARM: 8974/1: use SPARSMEM_STATIC when SPARSEMEM is enabled
ARM: 8971/1: replace the sole use of a symbol with its definition
ARM: 8969/1: decompressor: simplify libfdt builds
Update rmk's email address in various drivers
ARM: compat: remove KERNEL_DS usage in sys_oabi_epoll_ctl()
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull EFI updates from Ingo Molnar:
"The EFI changes for this cycle are:
- preliminary changes for RISC-V
- Add support for setting the resolution on the EFI framebuffer
- Simplify kernel image loading for arm64
- Move .bss into .data via the linker script instead of relying on
symbol annotations.
- Get rid of __pure getters to access global variables
- Clean up the config table matching arrays
- Rename pr_efi/pr_efi_err to efi_info/efi_err, and use them
consistently
- Simplify and unify initrd loading
- Parse the builtin command line on x86 (if provided)
- Implement printk() support, including support for wide character
strings
- Simplify GDT handling in early mixed mode thunking code
- Some other minor fixes and cleanups"
* tag 'efi-core-2020-06-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (79 commits)
efi/x86: Don't blow away existing initrd
efi/x86: Drop the special GDT for the EFI thunk
efi/libstub: Add missing prototype for PE/COFF entry point
efi/efivars: Add missing kobject_put() in sysfs entry creation error path
efi/libstub: Use pool allocation for the command line
efi/libstub: Don't parse overlong command lines
efi/libstub: Use snprintf with %ls to convert the command line
efi/libstub: Get the exact UTF-8 length
efi/libstub: Use %ls for filename
efi/libstub: Add UTF-8 decoding to efi_puts
efi/printf: Add support for wchar_t (UTF-16)
efi/gop: Add an option to list out the available GOP modes
efi/libstub: Add definitions for console input and events
efi/libstub: Implement printk-style logging
efi/printf: Turn vsprintf into vsnprintf
efi/printf: Abort on invalid format
efi/printf: Refactor code to consolidate padding and output
efi/printf: Handle null string input
efi/printf: Factor out integer argument retrieval
efi/printf: Factor out width/precision parsing
...
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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>
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The size field of the tag header structure is supposed to be set to the
size of a tag structure including the header.
Fixes: c772568788b5f0 ("ARM: add additional table to compressed kernel")
Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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Instead of using __efistub_global to force variables into the .data
section, leave them in the .bss but pull the EFI stub's .bss section
into .data in the linker script for the compressed kernel.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20200416151227.3360778-2-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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The boot stub does not emit a .fixup section at all anymore, so remove
it.
Link: https://lore.kernel.org/lkml/202002080058.FD1DDB1@keescook/
Suggested-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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Based on 2 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation #
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-only
has been chosen to replace the boilerplate/reference in 4122 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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The linker can sometimes add additional sections to the zImage ELF file
which results in the zImage binary being larger than expected. This
causes appended DT blobs to fail.
Verify that the zImage binary is the expected size, and fail the build
if this is not the case.
We need to include the .data.rel.ro section in the image as the RiscPC
build includes font data that contains a small amount of data in this
section.
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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Add an additional symbol to the decompressor image, which will allow
future debugging of non-bootable problems similar to the one encountered
with the EFI stub.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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Add an additional extendable table to the compressed kernel so that we
can provide further information to boot loaders regarding the properties
of the image contained within.
This is necessary for correct behaviour of kexec.
Tested-by: Tony Lindgren <tony@atomide.com>
Tested-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
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To prevent unintended modifications to the kernel text (malicious or
otherwise) while running the EFI stub, describe the kernel image as
two separate sections: a .text section with read-execute permissions,
covering .text, .rodata, .piggytext and the GOT sections (which the
stub does not care about anyway), and a .data section with read-write
permissions, covering .data and .bss.
This relies on the firmware to actually take the section permission
flags into account, but this is something that is currently being
implemented in EDK2, which means we will likely start seeing it in
the wild between one and two years from now.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20170818194947.19347-12-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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This patch adds EFI stub support for the ARM Linux kernel.
The EFI stub operates similarly to the x86 and arm64 stubs: it is a
shim between the EFI firmware and the normal zImage entry point, and
sets up the environment that the zImage is expecting. This includes
optionally loading the initrd and device tree from the system partition
based on the kernel command line.
Signed-off-by: Roy Franz <roy.franz@linaro.org>
Tested-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
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As we are now using the C preprocessor, we do not need to use sed to
edit constants in this file, and then pass the resulting file through
the C preprocessor. Instead, rely solely on the C preprocessor to
rewrite TEXT_START and BSS_ADDR.
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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