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| author |   Mike Kravetz <mike.kravetz@oracle.com> | 2017-09-06 16:20:55 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 17:27:26 -0700 |
| commit | dba58d3b8c5045ad89c1c95d33d01451e3964db7 (patch) | |
| tree | 39a5693fa2844a073a85be7ad9482fc4d55dfb51 /mm/gup.c | |
| parent | mm, page_owner: don't grab zone->lock for init_pages_in_zone() (diff) | |
| download | wireguard-linux-dba58d3b8c5045ad89c1c95d33d01451e3964db7.tar.xz wireguard-linux-dba58d3b8c5045ad89c1c95d33d01451e3964db7.zip | |
mm/mremap: fail map duplication attempts for private mappings
mremap will attempt to create a 'duplicate' mapping if old_size == 0 is
specified. In the case of private mappings, mremap will actually create
a fresh separate private mapping unrelated to the original. This does
not fit with the design semantics of mremap as the intention is to
create a new mapping based on the original.
Therefore, return EINVAL in the case where an attempt is made to
duplicate a private mapping. Also, print a warning message (once) if
such an attempt is made.
Link: http://lkml.kernel.org/r/cb9d9f6a-7095-582f-15a5-62643d65c736@oracle.com
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Aaron Lu <aaron.lu@intel.com>
Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/gup.c')
0 files changed, 0 insertions, 0 deletions