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x86/mm: Fix vmalloc_fault to use pXd_large

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commit 18a955219bf7d9008ce480d4451b6b8bf4483a22 upstream.

Gratian Crisan reported that vmalloc_fault() crashes when CONFIG_HUGETLBFS
is not set since the function inadvertently uses pXn_huge(), which always
return 0 in this case.  ioremap() does not depend on CONFIG_HUGETLBFS.

Fix vmalloc_fault() to call pXd_large() instead.

Fixes: f4eafd8bcd52 ("x86/mm: Fix vmalloc_fault() to handle large pages properly")
Reported-by: Gratian Crisan <gratian.crisan@ni.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20180313170347.3829-2-toshi.kani@hpe.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Toshi Kani 2018-03-13 11:03:46 -06:00 • committed by Greg Kroah-Hartman
parent aa23dba4d8
commit d7230d5286
1 changed files with 3 additions and 3 deletions
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6
arch/x86/mm/fault.c
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@ -287,7 +287,7 @@ static noinline int vmalloc_fault(unsigned long address)
if (!pmd_k)
return -1;
if (pmd_huge(*pmd_k))
if (pmd_large(*pmd_k))
return 0;
pte_k = pte_offset_kernel(pmd_k, address);
@ -407,7 +407,7 @@ static noinline int vmalloc_fault(unsigned long address)
if (pud_none(*pud) || pud_pfn(*pud) != pud_pfn(*pud_ref))
BUG();
if (pud_huge(*pud))
if (pud_large(*pud))
return 0;
pmd = pmd_offset(pud, address);
@ -418,7 +418,7 @@ static noinline int vmalloc_fault(unsigned long address)
if (pmd_none(*pmd) || pmd_pfn(*pmd) != pmd_pfn(*pmd_ref))
BUG();
if (pmd_huge(*pmd))
if (pmd_large(*pmd))
return 0;
pte_ref = pte_offset_kernel(pmd_ref, address);