Commit e44ec4a3 authored Oct 29, 2019 by Xiang Zheng Committed by Catalin Marinas Oct 29, 2019

arm64: print additional fault message when executing non-exec memory



When attempting to executing non-executable memory, the fault message
shows:

  Unable to handle kernel read from unreadable memory at virtual address
  ffff802dac469000

This may confuse someone, so add a new fault message for instruction
abort.

Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Xiang Zheng <zhengxiang9@huawei.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent bfcef4ab

arch/arm64/mm/fault.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -314,6 +314,8 @@ static void __do_kernel_fault(unsigned long addr, unsigned int esr,
		if (is_el1_permission_fault(addr, esr, regs)) {
		if (esr & ESR_ELx_WNR)
		msg = "write to read-only memory";
		else if (is_el1_instruction_abort(esr))
		msg = "execute from non-executable memory";
		else
		msg = "read from unreadable memory";
		} else if (addr < PAGE_SIZE) {

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