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arm64/mm: Identify user instruction aborts 

We don't currently set the FAULT_FLAG_INSTRUCTION mm flag for EL0
instruction aborts. This has no functional impact, as we don't override
arch_vma_access_permitted(), and the default implementation always returns
true. However, it would be helpful to provide the flag so that it can be
consumed by tracepoints such as dax_pmd_fault.

This patch sets the FAULT_FLAG_INSTRUCTION flag for EL0 instruction aborts.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Anshuman Khandual 2019-05-05 09:45:12 +05:30 committed by Catalin Marinas
parent 87dedf7c61
commit 01de1776f6
1 changed files with 1 additions and 0 deletions
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arch/arm64/mm/fault.c
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@ -464,6 +464,7 @@ static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
if (is_el0_instruction_abort(esr)) {
vm_flags = VM_EXEC;
mm_flags |= FAULT_FLAG_INSTRUCTION;
} else if ((esr & ESR_ELx_WNR) && !(esr & ESR_ELx_CM)) {
vm_flags = VM_WRITE;
mm_flags |= FAULT_FLAG_WRITE;