Commit d79df630 authored by David Rientjes's avatar David Rientjes Committed by Linus Torvalds

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: default avatarDavid Rientjes <rientjes@google.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b8a0b6cc
...@@ -729,7 +729,11 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask, ...@@ -729,7 +729,11 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
} else { } else {
*policy = pol == &default_policy ? MPOL_DEFAULT : *policy = pol == &default_policy ? MPOL_DEFAULT :
pol->mode; 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) { if (vma) {
......
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