diff mbox series

[RFC,2/4] arm64/mm: Identify user level instruction faults

Message ID 1550045191-27483-3-git-send-email-anshuman.khandual@arm.com (mailing list archive)
State New, archived
Headers show
Series mm: Introduce lazy exec permission setting on a page | expand

Commit Message

Anshuman Khandual Feb. 13, 2019, 8:06 a.m. UTC 
Page fault flags (FAULT_FLAG_XXX) need to be passed down fault handling
path for appropriate action and reporting. Identify user instruction
fetch faults and mark them with FAULT_FLAG_INSTRUCTION.

Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
 arch/arm64/mm/fault.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index efb7b2c..591670d 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -468,6 +468,9 @@  static int __kprobes do_page_fault(unsigned long addr, unsigned int esr,
 		mm_flags |= FAULT_FLAG_WRITE;
 	}
 
+	if (is_el0_instruction_abort(esr))
+		mm_flags |= FAULT_FLAG_INSTRUCTION;
+
 	if (is_ttbr0_addr(addr) && is_el1_permission_fault(addr, esr, regs)) {
 		/* regs->orig_addr_limit may be 0 if we entered from EL0 */
 		if (regs->orig_addr_limit == KERNEL_DS)