mm/hotplug: verify hotplug memory range

add_memory() and remove_memory() can only handle a memory range aligned
with section.  There are problems when an unaligned range is added and
then deleted as follows:

 - add_memory() with an unaligned range succeeds, but __add_pages()
   called from add_memory() adds a whole section of pages even though
   a given memory range is less than the section size.
 - remove_memory() to the added unaligned range hits BUG_ON() in
   __remove_pages().

This patch changes add_memory() and remove_memory() to check if a given
memory range is aligned with section at the beginning.  As the result,
add_memory() fails with -EINVAL when a given range is unaligned, and does
not add such memory range.  This prevents remove_memory() to be called
with an unaligned range as well.  Note that remove_memory() has to use
BUG_ON() since this function cannot fail.

[akpm@linux-foundation.org: avoid printk warnings]
Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 23 insertions, 0 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 46b489cacdd8..247d66675a91 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1070,6 +1070,23 @@ out:
         return ret;
 }
 
+static int check_hotplug_memory_range(u64 start, u64 size)
+{
+        u64 start_pfn = start >> PAGE_SHIFT;
+        u64 nr_pages = size >> PAGE_SHIFT;
+
+        /* Memory range must be aligned with section */
+        if ((start_pfn & ~PAGE_SECTION_MASK) ||
+            (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) {
+                pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n",
+                                (unsigned long long)start,
+                                (unsigned long long)size);
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
 /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
 int __ref add_memory(int nid, u64 start, u64 size)
 {
@@ -1079,6 +1096,10 @@ int __ref add_memory(int nid, u64 start, u64 size)
         struct resource *res;
         int ret;
 
+        ret = check_hotplug_memory_range(start, size);
+        if (ret)
+                return ret;
+
         lock_memory_hotplug();
 
         res = register_memory_resource(start, size);
@@ -1786,6 +1807,8 @@ void __ref remove_memory(int nid, u64 start, u64 size)
 {
         int ret;
 
+        BUG_ON(check_hotplug_memory_range(start, size));
+
         lock_memory_hotplug();
 
         /*