[PATCH 0/3] arm64/boot: Forbid the use of BSS symbols in startup code

[Ard Biesheuvel]

From: Ard Biesheuvel <ardb at kernel.org>

Move any variables accessed or assigned by the startup code out of BSS,
and into .data, so that we can forbid the use of BSS variables
altogether, by ASSERT()'ing in the linker script that each symbol made
available to the startup code lives before __bss_start in the linker
map.

Cc: Yeoreum Yun <yeoreum.yun at arm.com>

Ard Biesheuvel (3):
  arm64/boot: Move init_pgdir[] into __pi_ namespace
  arm64/boot: Move global CPU override variables out of BSS
  arm64/boot: Disallow BSS exports to startup code

 arch/arm64/include/asm/pgtable.h |  2 -
 arch/arm64/kernel/cpufeature.c   | 22 +++----
 arch/arm64/kernel/image-vars.h   | 68 ++++++++++----------
 arch/arm64/kernel/pi/pi.h        |  1 +
 arch/arm64/kernel/vmlinux.lds.S  |  6 +-
 5 files changed, 51 insertions(+), 48 deletions(-)

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2.49.0.906.g1f30a19c02-goog