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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>
This commit is contained in:
Xiang Zheng 2019-10-29 20:41:31 +08:00 committed by Catalin Marinas
parent bfcef4ab1d
commit e44ec4a35d
1 changed files with 2 additions and 0 deletions
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2
arch/arm64/mm/fault.c
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@ -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) {