Messages in this thread Patch in this message | | | From | ira.weiny@intel ... | Subject | [PATCH V8 44/44] devdax: Enable stray access protection | Date | Thu, 27 Jan 2022 09:55:05 -0800 |
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From: Ira Weiny <ira.weiny@intel.com>
Device dax is primarily accessed through user space and kernel access is controlled through the kmap interfaces.
Now that all valid kernel initiated access to dax devices have been accounted for, turn on PGMAP_PKEYS_PROTECT for device dax.
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
--- Changes for V8 Rebase to 5.17-rc1 Use pgmap_protection_available() s/PGMAP_PKEYS_PROTECT/PGMAP_PROTECTION/ --- drivers/dax/device.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/dax/device.c b/drivers/dax/device.c index d33a0613ed0c..cee375ef2cac 100644 --- a/drivers/dax/device.c +++ b/drivers/dax/device.c @@ -452,6 +452,8 @@ int dev_dax_probe(struct dev_dax *dev_dax) if (dev_dax->align > PAGE_SIZE) pgmap->vmemmap_shift = order_base_2(dev_dax->align >> PAGE_SHIFT); + if (pgmap_protection_available()) + pgmap->flags |= PGMAP_PROTECTION; addr = devm_memremap_pages(dev, pgmap); if (IS_ERR(addr)) return PTR_ERR(addr); -- 2.31.1
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