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b8fdef311a
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Mark Brown b8fdef311a arm64: Always force a branch protection mode when the compiler has one 
Compilers with branch protection support can be configured to enable it by
default, it is likely that distributions will do this as part of deploying
branch protection system wide. As well as the slight overhead from having
some extra NOPs for unused branch protection features this can cause more
serious problems when the kernel is providing pointer authentication to
userspace but not built for pointer authentication itself. In that case our
switching of keys for userspace can affect the kernel unexpectedly, causing
pointer authentication instructions in the kernel to corrupt addresses.

To ensure that we get consistent and reliable behaviour always explicitly
initialise the branch protection mode, ensuring that the kernel is built
the same way regardless of the compiler defaults.

Fixes: 7503197562 (arm64: add basic pointer authentication support)
Reported-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
[catalin.marinas@arm.com: remove Kconfig option in favour of Makefile check]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2020-04-01 21:23:40 +01:00
..
alpha Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
arc arc: mm: add p?d_leaf() definitions 2020-02-04 03:05:24 +00:00
arm ARM: SoC fixes 2020-02-15 13:16:47 -08:00
arm64 arm64: Always force a branch protection mode when the compiler has one 2020-04-01 21:23:40 +01:00
c6x Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-01-28 10:07:09 -08:00
csky csky: Replace <linux/clk-provider.h> by <linux/of_clk.h> 2020-02-23 12:48:55 +08:00
h8300 Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-01-28 10:07:09 -08:00
hexagon Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2020-01-28 10:07:09 -08:00
ia64 proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
m68k Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu 2020-02-06 08:13:23 +00:00
microblaze Microblaze patches for 5.6-rc1 2020-02-04 11:58:07 +00:00
mips Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
nds32 TTY/Serial driver updates for 5.6-rc1 2020-01-29 10:13:27 -08:00
nios2 TTY/Serial driver updates for 5.6-rc1 2020-01-29 10:13:27 -08:00
openrisc TTY/Serial driver updates for 5.6-rc1 2020-01-29 10:13:27 -08:00
parisc Merge branch 'parisc-5.6-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux 2020-02-05 07:29:40 +00:00
powerpc powerpc/entry: Fix an #if which should be an #ifdef in entry_32.S 2020-02-19 10:35:22 +11:00
riscv Microblaze patches for 5.6-rc1 2020-02-04 11:58:07 +00:00
s390 s390/qdio: fill SBALEs with absolute addresses 2020-02-19 17:26:32 +01:00
sh proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
sparc Kbuild updates for v5.6 (2nd) 2020-02-09 16:05:50 -08:00
um proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
unicore32 MPX requires recompiling applications, which requires compiler support. 2020-01-30 16:11:50 -08:00
x86 Two fixes for the AMD MCE driver: 2020-02-22 18:02:10 -08:00
xtensa Xtensa updates for v5.6: 2020-02-07 12:22:29 -08:00
.gitignore
Kconfig asm-generic/tlb: provide MMU_GATHER_TABLE_FREE 2020-02-04 03:05:26 +00:00