Commit d79df630 authored Jul 04, 2008 by David Rientjes Committed by Linus Torvalds Jul 04, 2008

mempolicy: mask off internal flags for userspace API



Flags considered internal to the mempolicy kernel code are stored as part
of the "flags" member of struct mempolicy.

Before exposing a policy type to userspace via get_mempolicy(), these
internal flags must be masked.  Flags exposed to userspace, however,
should still be returned to the user.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent b8a0b6cc

mm/mempolicy.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -729,7 +729,11 @@ static long do_get_mempolicy(int policy, nodemask_t nmask,
		} else {
		*policy = pol == &default_policy ? MPOL_DEFAULT :
		pol->mode;
		*policy \|= pol->flags;
		/*
		* Internal mempolicy flags must be masked off before exposing
		* the policy to userspace.
		*/
		*policy \|= (pol->flags & MPOL_MODE_FLAGS);
		}

		if (vma) {