Commit a611444d authored Nov 23, 2016 by Patrick Daly Committed by Gerrit - the friendly Code Review server Jan 12, 2017

mm: Inform KASAN when allocating pages during isolation



kasan_alloc_pages() should be called alongside kernel_map_pages() to
prevent splats when CONFIG_KASAN is enabled.

This is a greatly simplified version of
commit 46f24fd857b37bb86ddd5d0ac3d194e984dfdf1c
("mm/page_alloc: introduce post allocation processing on page allocator")
which solve the same problem on later kernel versions.

Change-Id: Ib60d079a4d8685e781624bb1403b2a3060e31d27
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>

parent bf10764e

mm/page_isolation.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -7,6 +7,7 @@
		#include <linux/pageblock-flags.h>
		#include <linux/memory.h>
		#include <linux/hugetlb.h>
		#include <linux/kasan.h>
		#include "internal.h"

		int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages)
		@@ -104,6 +105,8 @@ void unset_migratetype_isolate(struct page *page, unsigned migratetype)

		if (!is_migrate_isolate_page(buddy)) {
		__isolate_free_page(page, order);
		kasan_alloc_pages(page, order);
		arch_alloc_page(page, order);
		kernel_map_pages(page, (1 << order), 1);
		set_page_refcounted(page);
		isolated_page = page;