linux-stable/arch/powerpc
Ard Biesheuvel ff69279a44 powerpc: disable support for relative ksymtab references
The newly added code that emits ksymtab entries as pairs of 32-bit
relative references interacts poorly with the way powerpc lays out its
address space: when a module exports a per-CPU variable, the primary
module region covering the ksymtab entry -and thus the 32-bit relative
reference- is too far away from the actual per-CPU variable's base
address (to which the per-CPU offsets are applied to obtain the
respective address of each CPU's copy), resulting in corruption when the
module loader attempts to resolve symbol references of modules that are
loaded on top and link to the exported per-CPU symbol.

So let's disable this feature on powerpc.  Even though it implements
CONFIG_RELOCATABLE, it does not implement CONFIG_RANDOMIZE_BASE and so
KASLR kernels (which are the main target of the feature) do not exist on
powerpc anyway.

Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Suggested-by: Nicholas Piggin <nicholas.piggin@gmail.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-29 16:12:07 -07:00
..
boot powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
configs powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
crypto powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
include powerpc fixes for 4.19 #2 2018-08-24 09:34:23 -07:00
kernel powerpc fixes for 4.19 #2 2018-08-24 09:34:23 -07:00
kvm powerpc fixes for 4.19 #2 2018-08-24 09:34:23 -07:00
lib powerpc/lib: Use patch_site to patch copy_32 functions once cache is enabled 2018-08-10 22:12:35 +10:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax 2018-08-26 11:48:42 -07:00
net powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
oprofile treewide: kzalloc() -> kcalloc() 2018-06-12 16:19:22 -07:00
perf powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
platforms Merge branch 'ida-4.19' of git://git.infradead.org/users/willy/linux-dax 2018-08-26 11:48:42 -07:00
purgatory powerpc updates for 4.19 2018-08-17 11:32:50 -07:00
sysdev treewide: correct "differenciate" and "instanciate" typos 2018-08-23 18:48:43 -07:00
tools powerpc: Add a checkpatch wrapper with our preferred settings 2018-08-07 21:49:25 +10:00
xmon Merge branch 'fixes' into next 2018-08-13 15:59:06 +10:00
Kconfig powerpc: disable support for relative ksymtab references 2018-08-29 16:12:07 -07:00
Kconfig.debug Kconfig: consolidate the "Kernel hacking" menu 2018-08-02 08:06:48 +09:00
Makefile kbuild: rename LDFLAGS to KBUILD_LDFLAGS 2018-08-24 08:22:08 +09:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00