This is a note to let you know that I've just added the patch titled

x86/mm: Fix vmalloc_fault to use pXd_large

to the 4.15-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: x86-mm-fix-vmalloc_fault-to-use-pxd_large.patch and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 18a955219bf7d9008ce480d4451b6b8bf4483a22 Mon Sep 17 00:00:00 2001

From: Toshi Kani toshi.kani@hpe.com Date: Tue, 13 Mar 2018 11:03:46 -0600 Subject: x86/mm: Fix vmalloc_fault to use pXd_large

From: Toshi Kani toshi.kani@hpe.com

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

--- arch/x86/mm/fault.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -330,7 +330,7 @@ static noinline int vmalloc_fault(unsign 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); @@ -475,7 +475,7 @@ static noinline int vmalloc_fault(unsign 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); @@ -486,7 +486,7 @@ static noinline int vmalloc_fault(unsign 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);

Patches currently in stable-queue which might be from toshi.kani@hpe.com are

queue-4.15/x86-mm-fix-vmalloc_fault-to-use-pxd_large.patch