+ numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: numa: change get_mempolicy() to use nr_node_ids instead of MAX_NUMNODES
has been added to the -mm tree.  Its filename is
     numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes.patch

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------------------------------------------------------
From: Ralph Campbell <rcampbell@nvidia.com>
Subject: numa: change get_mempolicy() to use nr_node_ids instead of MAX_NUMNODES

The system call, get_mempolicy() [1], passes an unsigned long *nodemask
pointer and an unsigned long maxnode argument which specifies the length
of the user's nodemask array in bits (which is rounded up).  The manual
page says that if the maxnode value is too small, get_mempolicy will
return EINVAL but there is no system call to return this minimum value. 
To determine this value, some programs search /proc/<pid>/status for a
line starting with "Mems_allowed:" and use the number of digits in the
mask to determine the minimum value.  A recent change to the way this line
is formatted [2] causes these programs to compute a value less than
MAX_NUMNODES so get_mempolicy() returns EINVAL.

Change get_mempolicy(), the older compat version of get_mempolicy(), and
the copy_nodes_to_user() function to use nr_node_ids instead of
MAX_NUMNODES, thus preserving the defacto method of computing the minimum
size for the nodemask array and the maxnode argument.

[1] http://man7.org/linux/man-pages/man2/get_mempolicy.2.html
[2] https://lore.kernel.org/lkml/1545405631-6808-1-git-send-email-longman@redhat.com

Link: http://lkml.kernel.org/r/20190211180245.22295-1-rcampbell@nvidia.com
Fixes: 4fb8e5b89bcbbbb ("include/linux/nodemask.h: use nr_node_ids (not MAX_NUMNODES) in __nodemask_pr_numnodes()")
Signed-off-by: Ralph Campbell <rcampbell@nvidia.com>
Suggested-by: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Waiman Long <longman@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/mempolicy.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/mm/mempolicy.c~numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes
+++ a/mm/mempolicy.c
@@ -1314,7 +1314,7 @@ static int copy_nodes_to_user(unsigned l
 			      nodemask_t *nodes)
 {
 	unsigned long copy = ALIGN(maxnode-1, 64) / 8;
-	const int nbytes = BITS_TO_LONGS(MAX_NUMNODES) * sizeof(long);
+	unsigned int nbytes = BITS_TO_LONGS(nr_node_ids) * sizeof(long);
 
 	if (copy > nbytes) {
 		if (copy > PAGE_SIZE)
@@ -1491,7 +1491,7 @@ static int kernel_get_mempolicy(int __us
 	int uninitialized_var(pval);
 	nodemask_t nodes;
 
-	if (nmask != NULL && maxnode < MAX_NUMNODES)
+	if (nmask != NULL && maxnode < nr_node_ids)
 		return -EINVAL;
 
 	err = do_get_mempolicy(&pval, &nodes, addr, flags);
@@ -1527,7 +1527,7 @@ COMPAT_SYSCALL_DEFINE5(get_mempolicy, in
 	unsigned long nr_bits, alloc_size;
 	DECLARE_BITMAP(bm, MAX_NUMNODES);
 
-	nr_bits = min_t(unsigned long, maxnode-1, MAX_NUMNODES);
+	nr_bits = min_t(unsigned long, maxnode-1, nr_node_ids);
 	alloc_size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
 
 	if (nmask)
_

Patches currently in -mm which might be from rcampbell@nvidia.com are

numa-change-get_mempolicy-to-use-nr_node_ids-instead-of-max_numnodes.patch