From: Anton Blanchard Date: Wed, 14 Sep 2011 20:26:15 +0000 (+1000) Subject: memory hotplug: Refuse to add unaligned memory regions X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=61b94feafa1c59a1de2719d23294dea6fd4ca362;p=linux-beck.git memory hotplug: Refuse to add unaligned memory regions The sysfs memory probe interface allows unaligned regions to be added: # echo 0xffffff > /sys/devices/system/memory/probe # cat /proc/iomem 00ffffff-01fffffe : System RAM 01ffffff-02fffffe : System RAM 02ffffff-03fffffe : System RAM 03ffffff-04fffffe : System RAM 04ffffff-05fffffe : System RAM Return -EINVAL instead of creating these bad regions. Signed-off-by: Anton Blanchard Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/memory.c b/drivers/base/memory.c index 2840ed4668c1..2a0b5f1020ed 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -380,9 +380,13 @@ memory_probe_store(struct class *class, struct class_attribute *attr, u64 phys_addr; int nid; int i, ret; + unsigned long pages_per_block = PAGES_PER_SECTION * sections_per_block; phys_addr = simple_strtoull(buf, NULL, 0); + if (phys_addr & ((pages_per_block << PAGE_SHIFT) - 1)) + return -EINVAL; + for (i = 0; i < sections_per_block; i++) { nid = memory_add_physaddr_to_nid(phys_addr); ret = add_memory(nid, phys_addr,