diff options
| author | Petr Holasek <pholasek@redhat.com> | 2011-12-08 13:16:41 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-12-09 08:03:34 +0100 |
| commit | 54eed6cb16ec315565aaaf8e34252ca253a68b7b (patch) | |
| tree | 281cc87a1fd838255b02e39887e49596d8a1fa58 /arch/x86/mm | |
| parent | mm, x86: Remove debug_pagealloc_enabled (diff) | |
| download | linux-54eed6cb16ec315565aaaf8e34252ca253a68b7b.tar.xz linux-54eed6cb16ec315565aaaf8e34252ca253a68b7b.zip | |
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>
Diffstat (limited to 'arch/x86/mm')
| -rw-r--r-- | arch/x86/mm/numa.c | 10 |
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; } |