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| author | Dan Williams | 2018-04-20 06:32:19 +0200 |
|---|---|---|
| committer | Dan Williams | 2018-05-22 16:19:08 +0200 |
| commit | a9b6de77b1a3ff729f7bfc54b2e17711776a416c (patch) | |
| tree | abf94e003816c5c99bb5792a8e636905a44ad48e /fs/dax.c | |
| parent | mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS (diff) | |
| download | kernel-qcow2-linux-a9b6de77b1a3ff729f7bfc54b2e17711776a416c.tar.gz kernel-qcow2-linux-a9b6de77b1a3ff729f7bfc54b2e17711776a416c.tar.xz kernel-qcow2-linux-a9b6de77b1a3ff729f7bfc54b2e17711776a416c.zip | |
mm: fix __gup_device_huge vs unmap
get_user_pages_fast() for device pages is missing the typical validation
that all page references have been taken while the mapping was valid.
Without this validation truncate operations can not reliably coordinate
against new page reference events like O_DIRECT.
Cc: <stable@vger.kernel.org>
Fixes: 3565fce3a659 ("mm, x86: get_user_pages() for dax mappings")
Reported-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'fs/dax.c')
0 files changed, 0 insertions, 0 deletions