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mempolicy: mask off internal flags for userspace API

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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 <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Rientjes 2008-07-04 12:24:13 -07:00 • committed by Linus Torvalds
commit d79df630f6
1 changed files with 5 additions and 1 deletions
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6
mm/mempolicy.c
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@ -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) {