path: root/mm
diff options
authorYisheng Xie <xieyisheng1@huawei.com>2018-01-31 16:16:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:36 -0800
commit0486a38bcc4749808edbc848f1bcf232042770fc (patch)
tree086609c0e0916a43469e57d4ae6f2ba51ce34c06 /mm
parentmm/mempolicy: fix the check of nodemask from user (diff)
mm/mempolicy: add nodes_empty check in SYSC_migrate_pages
As in manpage of migrate_pages, the errno should be set to EINVAL when none of the node IDs specified by new_nodes are on-line and allowed by the process's current cpuset context, or none of the specified nodes contain memory. However, when test by following case: new_nodes = 0; old_nodes = 0xf; ret = migrate_pages(pid, old_nodes, new_nodes, MAX); The ret will be 0 and no errno is set. As the new_nodes is empty, we should expect EINVAL as documented. To fix the case like above, this patch check whether target nodes AND current task_nodes is empty, and then check whether AND node_states[N_MEMORY] is empty. Link: http://lkml.kernel.org/r/1510882624-44342-4-git-send-email-xieyisheng1@huawei.com Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andi Kleen <ak@linux.intel.com> Cc: Chris Salls <salls@cs.ucsb.edu> Cc: Christopher Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Tan Xiaojun <tanxiaojun@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 65df28d7cc89..f604b22ebb65 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1433,10 +1433,14 @@ SYSCALL_DEFINE4(migrate_pages, pid_t, pid, unsigned long, maxnode,
goto out_put;
- if (!nodes_subset(*new, node_states[N_MEMORY])) {
- err = -EINVAL;
+ task_nodes = cpuset_mems_allowed(current);
+ nodes_and(*new, *new, task_nodes);
+ if (nodes_empty(*new))
+ goto out_put;
+ nodes_and(*new, *new, node_states[N_MEMORY]);
+ if (nodes_empty(*new))
goto out_put;
- }
err = security_task_movememory(task);
if (err)