From: Xiang Zheng <zhengxiang9@huawei.com>
To: <catalin.marinas@arm.com>, <will@kernel.org>
Cc: wanghaibin.wang@huawei.com, james.morse@arm.com,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: print additional fault message when executing non-exec memory
Date: Mon, 28 Oct 2019 17:08:37 +0800 [thread overview]
Message-ID: <20191028090837.39652-1-zhengxiang9@huawei.com> (raw)
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.
Signed-off-by: Xiang Zheng <zhengxiang9@huawei.com>
---
arch/arm64/mm/fault.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 9fc6db0bcbad..68bf4ec376d0 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -318,6 +318,8 @@ 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 non-executable memory";
else
msg = "read from unreadable memory";
} else if (addr < PAGE_SIZE) {
--
2.19.1
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next reply other threads:[~2019-10-28 9:09 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-28 9:08 Xiang Zheng [this message]
2019-10-28 16:41 ` [PATCH] arm64: print additional fault message when executing non-exec memory Will Deacon
2019-10-29 1:02 ` Xiang Zheng
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