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author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2015-07-06 23:18:37 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-08-03 09:29:19 -0700 |
commit | c86df9fa76f914d84e02caf2aaf11a22ca1820c2 (patch) | |
tree | 2e2da0c8b9302431b8d9be9725883ee44bacf129 /kernel/rcu/rcutorture.c | |
parent | bf94e2202c008de5ebb87e6f5887aba5b9aa8152 (diff) |
mm: avoid setting up anonymous pages into file mapping
commit 6b7339f4c31ad69c8e9c0b2859276e22cf72176d upstream.
Reading page fault handler code I've noticed that under right
circumstances kernel would map anonymous pages into file mappings: if
the VMA doesn't have vm_ops->fault() and the VMA wasn't fully populated
on ->mmap(), kernel would handle page fault to not populated pte with
do_anonymous_page().
Let's change page fault handler to use do_anonymous_page() only on
anonymous VMA (->vm_ops == NULL) and make sure that the VMA is not
shared.
For file mappings without vm_ops->fault() or shred VMA without vm_ops,
page fault on pte_none() entry would lead to SIGBUS.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/rcu/rcutorture.c')
0 files changed, 0 insertions, 0 deletions