Nitin Gupta ea826dbc30 sparc64: Fix page table walk for PUD hugepages ...

[ Upstream commit 70f3c8b7c2 ]

For a PUD hugepage entry, we need to propagate bits [32:22]
from virtual address to resolve at 4M granularity. However,
the current code was incorrectly propagating bits [29:19].
This bug can cause incorrect data to be returned for pages
backed with 16G hugepages.

Signed-off-by: Nitin Gupta <nitin.m.gupta@oracle.com>
Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-11-21 09:49:25 +01:00

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