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Filename Latest commit message Latest commit date
Nick Desaulniers 0855fe6d88 arm64: link with -z norelro for LLD or aarch64-elf 
commit 311bea3cb9ee20ef150ca76fc60a592bf6b159f5 upstream.

With GNU binutils 2.35+, linking with BFD produces warnings for vmlinux:
aarch64-linux-gnu-ld: warning: -z norelro ignored

BFD can produce this warning when the target emulation mode does not
support RELRO program headers, and -z relro or -z norelro is passed.

Alan Modra clarifies:
  The default linker emulation for an aarch64-linux ld.bfd is
  -maarch64linux, the default for an aarch64-elf linker is
  -maarch64elf.  They are not equivalent.  If you choose -maarch64elf
  you get an emulation that doesn't support -z relro.

The ARCH=arm64 kernel prefers -maarch64elf, but may fall back to
-maarch64linux based on the toolchain configuration.

LLD will always create RELRO program header regardless of target
emulation.

To avoid the above warning when linking with BFD, pass -z norelro only
when linking with LLD or with -maarch64linux.

Fixes: 3b92fa7485eb ("arm64: link with -z norelro regardless of CONFIG_RELOCATABLE")
Fixes: 3bbd3db864 ("arm64: relocatable: fix inconsistencies in linker script and options")
Cc: <stable@vger.kernel.org> # 5.0.x-
Reported-by: kernelci.org bot <bot@kernelci.org>
Reported-by: Quentin Perret <qperret@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Cc: Alan Modra <amodra@gmail.com>
Cc: Fāng-ruì Sòng <maskray@google.com>
Link: https://lore.kernel.org/r/20201218002432.788499-1-ndesaulniers@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-30 08:47:44 -04:00
arch arm64: link with -z norelro for LLD or aarch64-elf 2021-06-30 08:47:44 -04:00
block
certs
crypto
Documentation mm/slub: clarify verification reporting 2021-06-23 14:41:30 +02:00
drivers mmc: meson-gx: use memcpy_to/fromio for dram-access-quirk 2021-06-30 08:47:44 -04:00
fs
include clocksource/drivers/timer-ti-dm: Handle dra7 timer wrap errata i940 2021-06-23 14:41:31 +02:00
init kbuild: add CONFIG_LD_IS_LLD 2021-06-30 08:47:44 -04:00
ipc
kernel module: limit enabling module.sig_enforce 2021-06-30 08:47:42 -04:00
lib
LICENSES
mm mm/slub.c: include swab.h 2021-06-23 14:41:30 +02:00
net net: bridge: fix vlan tunnel dst refcnt when egressing 2021-06-23 14:41:30 +02:00
samples
scripts
security
sound
tools tools headers UAPI: Sync linux/in.h copy with the kernel sources 2021-06-23 14:41:31 +02:00
usr
virt KVM: arm/arm64: Fix KVM_VGIC_V3_ADDR_TYPE_REDIST read 2021-06-23 14:41:31 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
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Makefile Linux 5.4.128 2021-06-23 14:41:32 +02:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.