linux-kernel - Re: [PATCH 0/2] ARM: fix PXN process with LPAE feature

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Message-ID: <09d3b1ac-01ab-ba8b-014a-8db8c58bfc45@huawei.com>
Date:   Tue, 1 Jun 2021 21:29:25 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Russell King <linux@...linux.org.uk>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Catalin Marinas <catalin.marinas@....com>,
        <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jungseung Lee <js07.lee@...il.com>
Subject: Re: [PATCH 0/2] ARM: fix PXN process with LPAE feature


On 2021/5/29 11:41, Kefeng Wang wrote:
> refactor and cleanup [__do|do]_page_fault, then fix the pxn process
> when lpae feature enabled.

Additional information:

when user code execution with privilege mode, it will lead infinite loop

in the page fault handler if ARM_LPAE enabled,  the issue could be

reproduced with  "echo EXEC_USERSPACE > 
/sys/kernel/debug/provoke-crash/DIRECT"

also I could add a die_kernel_fault() (like arm64 does) to report different

message in different scenes.

Any comments, thanks.


>
> Kefeng Wang (2):
>    ARM: mm: Refactor __do_page_fault()
>    ARM: mm: Fix PXN process when ARM_LPAE enabled
>
>   arch/arm/mm/fault.c | 78 +++++++++++++++++----------------------------
>   1 file changed, 30 insertions(+), 48 deletions(-)
>