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authorToshi Kani <toshi.kani@hp.com>2013-09-11 14:21:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:57:39 -0700
commit27356f54c8c32609ff45b4ed333bb64fb2eef374 (patch)
treec17cbd22bc897bdf6644e242bbd086e4197ba3f5 /mm/memory_hotplug.c
parent15610c86fa83ff778eb80d3cfaa71d6acceb628a (diff)
downloadop-kernel-dev-27356f54c8c32609ff45b4ed333bb64fb2eef374.zip
op-kernel-dev-27356f54c8c32609ff45b4ed333bb64fb2eef374.tar.gz
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>
Diffstat (limited to 'mm/memory_hotplug.c')
-rw-r--r--mm/memory_hotplug.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 46b489c..247d666 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();
/*
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