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linux/arch/arm64/include
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James Morse a5a095803c arm64: kernel: Save and restore UAO and addr_limit on exception entry 
commit e19a6ee246 upstream.

If we take an exception while at EL1, the exception handler inherits
the original context's addr_limit and PSTATE.UAO values. To be consistent
always reset addr_limit and PSTATE.UAO on (re-)entry to EL1. This
prevents accidental re-use of the original context's addr_limit.

Based on a similar patch for arm from Russell King.

Cc: <stable@vger.kernel.org> # 4.6-
Acked-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
[ backport to stop perf misusing inherited addr_limit.
  Removed code interacting with UAO and the irqstack ]
Link: https://bugs.chromium.org/p/project-zero/issues/detail?id=822
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2016-08-20 18:09:16 +02:00
..
asm arm64: kernel: Save and restore UAO and addr_limit on exception entry 2016-08-20 18:09:16 +02:00
uapi/asm arm64 fixes and clean-ups: 2015-11-12 15:33:11 -08:00