linux-kernel - Re: bug disabling NX (noexec=off)

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Message-ID: <alpine.DEB.2.21.1904141158400.4917@nanos.tec.linutronix.de>
Date:   Sun, 14 Apr 2019 11:59:30 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Xose Vazquez Perez <xose.vazquez@...il.com>
cc:     LKML <linux-kernel@...r.kernel.org>, x86 team <x86@...nel.org>
Subject: Re: bug disabling NX (noexec=off)

On Sat, 13 Apr 2019, Xose Vazquez Perez wrote:
> [    0.000000] NX (Execute Disable) protection: disabled by kernel command line option
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] attempted to set unsupported pgprot: 8000000000000163 bits: 8000000000000000 supported: 7fffffffffffffff

Does the below patch fix it for you?

Thanks,

	tglx

8<----------------
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 0029604af8a4..dd73d5d74393 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -825,7 +825,7 @@ void __init __early_set_fixmap(enum fixed_addresses idx,
 	pte = early_ioremap_pte(addr);
 
 	/* Sanitize 'prot' against any unsupported bits: */
-	pgprot_val(flags) &= __default_kernel_pte_mask;
+	pgprot_val(flags) &= __supported_pte_mask;
 
 	if (pgprot_val(flags))
 		set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));