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powerpc/nohash: fix pte_access_permitted()

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Commit 5769beaf18 ("powerpc/mm: Add proper pte access check helper
for other platforms") replaced generic pte_access_permitted() by an
arch specific one.

The generic one is defined as
(pte_present(pte) && (!(write) || pte_write(pte)))

The arch specific one is open coded checking that _PAGE_USER and
_PAGE_WRITE (_PAGE_RW) flags are set, but lacking to check that
_PAGE_RO and _PAGE_PRIVILEGED are unset, leading to a useless test
on targets like the 8xx which defines _PAGE_RW and _PAGE_USER as 0.

Commit 5fa5b16be5 ("powerpc/mm/hugetlb: Use pte_access_permitted
for hugetlb access check") replaced some tests performed with
pte helpers by a call to pte_access_permitted(), leading to the same
issue.

This patch rewrites powerpc/nohash pte_access_permitted()
using pte helpers.

Fixes: 5769beaf18 ("powerpc/mm: Add proper pte access check helper for other platforms")
Fixes: 5fa5b16be5 ("powerpc/mm/hugetlb: Use pte_access_permitted for hugetlb access check")
Cc: stable@vger.kernel.org # v4.15+
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy 2018-08-21 13:03:23 +00:00 committed by Michael Ellerman
parent 2ea6263068
commit 810e9f86f3
1 changed files with 3 additions and 6 deletions
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9
arch/powerpc/include/asm/nohash/pgtable.h
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@ -51,17 +51,14 @@ static inline int pte_present(pte_t pte)
#define pte_access_permitted pte_access_permitted
static inline bool pte_access_permitted(pte_t pte, bool write)
{
unsigned long pteval = pte_val(pte);
/*
* A read-only access is controlled by _PAGE_USER bit.
* We have _PAGE_READ set for WRITE and EXECUTE
*/
unsigned long need_pte_bits = _PAGE_PRESENT | _PAGE_USER;
if (!pte_present(pte) || !pte_user(pte) || !pte_read(pte))
return false;
if (write)
need_pte_bits |= _PAGE_WRITE;
if ((pteval & need_pte_bits) != need_pte_bits)
if (write && !pte_write(pte))
return false;
return true;