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Message-ID: <08906193-246b-c874-8bac-1d98d2313ac4@roeck-us.net> Date: Thu, 22 Sep 2022 09:29:40 -0700 From: Guenter Roeck <linux@...ck-us.net> To: Peter Zijlstra <peterz@...radead.org> Cc: Dave Hansen <dave.hansen@...el.com>, 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 :/ > > diff --git a/arch/x86/platform/efi/efi_32.c b/arch/x86/platform/efi/efi_32.c > index e06a199423c0..d81e379fcd43 100644 > --- a/arch/x86/platform/efi/efi_32.c > +++ b/arch/x86/platform/efi/efi_32.c > @@ -136,6 +136,7 @@ void __init efi_runtime_update_mappings(void) > if (md->type != EFI_RUNTIME_SERVICES_CODE) > continue; > > + set_memory_ro(md->virt_addr, md->num_pages); > set_memory_x(md->virt_addr, md->num_pages); > } > } Yes, it does. Tested-by: Guenter Roeck <linux@...ck-us.net> Guenter
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