arm64: kernel: Save and restore UAO and addr_limit on exception entry

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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>

...

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James Morse 2016-06-20 18:28:01 +01:00 • committed by Will Deacon

parent 4c2e07c6a2

commit e19a6ee246

4 changed files with 22 additions and 3 deletions

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2

arch/arm64/include/asm/ptrace.h

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1

arch/arm64/kernel/asm-offsets.c

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19

arch/arm64/kernel/entry.S

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3

arch/arm64/mm/fault.c

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