diff options
| author |   Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2016-04-29 23:25:34 +1000 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2016-05-01 18:32:26 +1000 |
| commit | ac29c64089b74d107edb90879e63a2f7a03cd66b (patch) | |
| tree | 3143933d055f49376ec549cc3ffe76a224b23288 /arch/powerpc/mm/hugepage-hash64.c | |
| parent | powerpc/mm: Use pte_user() instead of open coding (diff) | |
| download | linux-dev-ac29c64089b74d107edb90879e63a2f7a03cd66b.tar.xz linux-dev-ac29c64089b74d107edb90879e63a2f7a03cd66b.zip | |
powerpc/mm: Replace _PAGE_USER with _PAGE_PRIVILEGED
_PAGE_PRIVILEGED means the page can be accessed only by the kernel. This
is done to keep pte bits similar to PowerISA 3.0 Radix PTE format. User
pages are now marked by clearing _PAGE_PRIVILEGED bit.
Previously we allowed the kernel to have a privileged page in the lower
address range (USER_REGION). With this patch such access is denied.
We also prevent a kernel access to a non-privileged page in higher
address range (ie, REGION_ID != 0).
Both the above access scenarios should never happen.
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jeremy Kerr <jk@ozlabs.org>
Cc: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hugepage-hash64.c')
| -rw-r--r-- | arch/powerpc/mm/hugepage-hash64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/hugepage-hash64.c b/arch/powerpc/mm/hugepage-hash64.c index b4b6668d1b24..6cb6bdd254bb 100644 --- a/arch/powerpc/mm/hugepage-hash64.c +++ b/arch/powerpc/mm/hugepage-hash64.c @@ -40,7 +40,7 @@ int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid, if (unlikely(old_pmd & _PAGE_BUSY)) return 0; /* If PMD permissions don't match, take page fault */ - if (unlikely(access & ~old_pmd)) + if (unlikely(!check_pte_access(access, old_pmd))) return 1; /* * Try to lock the PTE, add ACCESSED and DIRTY if it was |