arm64: debug: Don't propagate UNKNOWN FAR into si_code for debug signals

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FAR_EL1 is UNKNOWN for all debug exceptions other than those caused by
taking a hardware watchpoint. Unfortunately, if a debug handler returns
a non-zero value, then we will propagate the UNKNOWN FAR value to
userspace via the si_addr field of the SIGTRAP siginfo_t.

Instead, let's set si_addr to take on the PC of the faulting instruction,
which we have available in the current pt_regs.

Cc: <stable@vger.kernel.org>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Will Deacon 2019-03-01 13:28:00 +00:00 • committed by Catalin Marinas

parent 3cd0ddb3de

commit b9a4b9d084

1 changed files with 5 additions and 4 deletions

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arch/arm64/mm/fault.c

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