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x86/mm: Prevent bogus warnings with "noexec=off"
Xose Vazquez Perez reported boot warnings when NX is disabled on the kernel command line. __early_set_fixmap() triggers this warning: attempted to set unsupported pgprot: 8000000000000163 bits: 8000000000000000 supported: 7fffffffffffffff WARNING: CPU: 0 PID: 0 at arch/x86/include/asm/pgtable.h:537 __early_set_fixmap+0xa2/0xff because it uses __default_kernel_pte_mask to mask out unsupported bits. Use __supported_pte_mask instead. Disabling NX on the command line also triggers the NX warning in the page table mapping check: WARNING: CPU: 1 PID: 1 at arch/x86/mm/dump_pagetables.c:262 note_page+0x2ae/0x650 .... Make the warning depend on NX set in __supported_pte_mask. Reported-by: Xose Vazquez Perez <xose.vazquez@gmail.com> Tested-by: Xose Vazquez Perez <xose.vazquez@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1904151037530.1729@nanos.tec.linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -259,7 +259,8 @@ static void note_wx(struct pg_state *st)
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#endif
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/* Account the WX pages */
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st->wx_pages += npages;
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WARN_ONCE(1, "x86/mm: Found insecure W+X mapping at address %pS\n",
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WARN_ONCE(__supported_pte_mask & _PAGE_NX,
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"x86/mm: Found insecure W+X mapping at address %pS\n",
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(void *)st->start_address);
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}
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@ -825,7 +825,7 @@ void __init __early_set_fixmap(enum fixed_addresses idx,
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pte = early_ioremap_pte(addr);
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/* Sanitize 'prot' against any unsupported bits: */
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pgprot_val(flags) &= __default_kernel_pte_mask;
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pgprot_val(flags) &= __supported_pte_mask;
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if (pgprot_val(flags))
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set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
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