[PATCH 5.3 084/180] s390/mm: properly clear _PAGE_NOEXEC bit when it is not supported

Greg Kroah-Hartman
2019-12-16T18:32:29Z

From: Gerald Schaefer <gerald.schaefer@de.ibm.com>

commit ab874f22d35a8058d8fdee5f13eb69d8867efeae upstream.

On older HW or under a hypervisor, w/o the instruction-execution-
protection (IEP) facility, and also w/o EDAT-1, a translation-specification
exception may be recognized when bit 55 of a pte is one (_PAGE_NOEXEC).

The current code tries to prevent setting _PAGE_NOEXEC in such cases,
by removing it within set_pte_at(). However, ptep_set_access_flags()
will modify a pte directly, w/o using set_pte_at(). There is at least
one scenario where this can result in an active pte with _PAGE_NOEXEC
set, which would then lead to a panic due to a translation-specification
exception (write to swapped out page):

do_swap_page
pte = mk_pte (with _PAGE_NOEXEC bit)
set_pte_at (will remove _PAGE_NOEXEC bit in page table, but keep it
in local variable pte)
vmf->orig_pte = pte (pte still contains _PAGE_NOEXEC bit)
do_wp_page
wp_page_reuse
entry = vmf->orig_pte (still with _PAGE_NOEXEC bit)
ptep_set_access_flags (writes entry with _PAGE_NOEXEC bit)

Fix this by clearing _PAGE_NOEXEC already in mk_pte_phys(), where the
pgprot value is applied, so that no pte with _PAGE_NOEXEC will ever be
visible, if it is not supported. The check in set_pte_at() can then also
be removed.

Cc: <stable@vger.kernel.org> # 4.11+
Fixes: 57d7f939e7bd ("s390: add no-execute support")
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
arch/s390/include/asm/pgtable.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1172,8 +1172,6 @@ void gmap_pmdp_idte_global(struct mm_str
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t entry)
{
- if (!MACHINE_HAS_NX)
- pte_val(entry) &= ~_PAGE_NOEXEC;
if (pte_present(entry))
pte_val(entry) &= ~_PAGE_UNUSED;
if (mm_has_pgste(mm))
@@ -1190,6 +1188,8 @@ static inline pte_t mk_pte_phys(unsigned
{
pte_t __pte;
pte_val(__pte) = physpage + pgprot_val(pgprot);
+ if (!MACHINE_HAS_NX)
+ pte_val(__pte) &= ~_PAGE_NOEXEC;
return pte_mkyoung(__pte);
}