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authorPetr Holasek <pholasek@redhat.com>2011-12-08 13:16:41 +0100
committerIngo Molnar <mingo@elte.hu>2011-12-09 08:03:34 +0100
commit54eed6cb16ec315565aaaf8e34252ca253a68b7b (patch)
tree281cc87a1fd838255b02e39887e49596d8a1fa58
parent54c29c635ae91f5d75ced7bffeaa77ba37ca02bb (diff)
downloadlinux-54eed6cb16ec315565aaaf8e34252ca253a68b7b.tar.bz2
x86/numa: Add constraints check for nid parameters
This patch adds constraint checks to the numa_set_distance() function. When the check triggers (this should not happen normally) it emits a warning and avoids a store to a negative index in numa_distance[] array - i.e. avoids memory corruption. Negative ids can be passed when the pxm-to-nids mapping is not properly filled while parsing the SRAT. Signed-off-by: Petr Holasek <pholasek@redhat.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Anton Arapov <anton@redhat.com> Link: http://lkml.kernel.org/r/20111208121640.GA2229@dhcp-27-244.brq.redhat.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/mm/numa.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index fbeaaf416610..cdc00543d375 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -430,8 +430,9 @@ static int __init numa_alloc_distance(void)
* calls are ignored until the distance table is reset with
* numa_reset_distance().
*
- * If @from or @to is higher than the highest known node at the time of
- * table creation or @distance doesn't make sense, the call is ignored.
+ * If @from or @to is higher than the highest known node or lower than zero
+ * at the time of table creation or @distance doesn't make sense, the call
+ * is ignored.
* This is to allow simplification of specific NUMA config implementations.
*/
void __init numa_set_distance(int from, int to, int distance)
@@ -439,8 +440,9 @@ void __init numa_set_distance(int from, int to, int distance)
if (!numa_distance && numa_alloc_distance() < 0)
return;
- if (from >= numa_distance_cnt || to >= numa_distance_cnt) {
- printk_once(KERN_DEBUG "NUMA: Debug: distance out of bound, from=%d to=%d distance=%d\n",
+ if (from >= numa_distance_cnt || to >= numa_distance_cnt ||
+ from < 0 || to < 0) {
+ pr_warn_once("NUMA: Warning: node ids are out of bound, from=%d to=%d distance=%d\n",
from, to, distance);
return;
}