linux-kernel - Re: [PATCH v2] x86/mm: Refuse W^X violations

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Message-ID: <44b4b20a-550c-6337-3f7d-8283498f76f2@intel.com>
Date:   Thu, 22 Sep 2022 08:00:33 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, keescook@...omium.org,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH v2] x86/mm: Refuse W^X violations

On 9/22/22 00:46, Peter Zijlstra wrote:
> On Wed, Sep 21, 2022 at 08:09:13PM -0700, Guenter Roeck wrote:
> 
>> Oh well, that "helped" to hide one of the crashes. Here is another one.
>> This is with PAE enabled and booting through efi32.
> 
>> [    1.086592]  efi_runtime_update_mappings+0x36/0x42
>> [    1.086717]  efi_enter_virtual_mode+0x351/0x36e
>> [    1.086860]  start_kernel+0x57d/0x60f
>> [    1.086956]  ? set_intr_gate+0x42/0x55
>> [    1.087079]  i386_start_kernel+0x43/0x45
>> [    1.087272]  startup_32_smp+0x161/0x164
> 
> Does this help? Dave; perhaps we should just let i386 be i386 and let it
> bitrot :/

How about we just turn off enforcement for now so that the poor i386
folks can at least boot?  I have the feeling we're going to get bored
with even the warnings if they persist for too long, though.

Untested patch to make i386 violations harmless is attached.
View attachment "norefuse.patch" of type "text/x-patch" (1185 bytes)