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| author | Gerald Schaefer <gerald.schaefer@de.ibm.com> | 2019-09-11 20:42:23 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-17 22:34:57 +0300 |
| commit | 4ca41aa4c6641f7eb5c30b9f7f11055dccc8c9ea (patch) | |
| tree | c6bb21d3d776b61b302a912eeb855475437c3e24 | |
| parent | 0cc303ba19f8844236731248ede929b213ad980d (diff) | |
| download | linux-4ca41aa4c6641f7eb5c30b9f7f11055dccc8c9ea.tar.xz | |
s390/mm: properly clear _PAGE_NOEXEC bit when it is not supported
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>
| -rw-r--r-- | arch/s390/include/asm/pgtable.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index de05466ce50c..0a326da1562f 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -1150,8 +1150,6 @@ void gmap_pmdp_idte_global(struct mm_struct *mm, unsigned long vmaddr); 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)) @@ -1168,6 +1166,8 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) { pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); + if (!MACHINE_HAS_NX) + pte_val(__pte) &= ~_PAGE_NOEXEC; return pte_mkyoung(__pte); } |