netdev - [PATCH 2/4] slub,rcu: don't assume the size of struct rcu

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 01 Mar 2011 16:03:30 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH 2/4] slub,rcu: don't assume the size of struct rcu_head


The size of struct rcu_head may be changed. When it becomes larger,
it will pollute the page array.

We reserve some some bytes for struct rcu_head when a slab
is allocated in this situation.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 slub.c |   30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index ad545b2..ceb135a 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1254,21 +1254,38 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
 	__free_pages(page, order);
 }
 
+#define need_reserve_slab_rcu						\
+	(sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head))
+
 static void rcu_free_slab(struct rcu_head *h)
 {
 	struct page *page;
 
-	page = container_of((struct list_head *)h, struct page, lru);
+	if (need_reserve_slab_rcu)
+		page = virt_to_head_page(h);
+	else
+		page = container_of((struct list_head *)h, struct page, lru);
+
 	__free_slab(page->slab, page);
 }
 
 static void free_slab(struct kmem_cache *s, struct page *page)
 {
 	if (unlikely(s->flags & SLAB_DESTROY_BY_RCU)) {
-		/*
-		 * RCU free overloads the RCU head over the LRU
-		 */
-		struct rcu_head *head = (void *)&page->lru;
+		struct rcu_head *head;
+
+		if (need_reserve_slab_rcu) {
+			int order = compound_order(page);
+			int offset = (PAGE_SIZE << order) - s->reserved;
+
+			BUG_ON(s->reserved != sizeof(*head));
+			head = page_address(page) + offset;
+		} else {
+			/*
+			 * RCU free overloads the RCU head over the LRU
+			 */
+			head = (void *)&page->lru;
+		}
 
 		call_rcu(head, rcu_free_slab);
 	} else
@@ -2356,6 +2373,9 @@ static int kmem_cache_open(struct kmem_cache *s,
 	s->flags = kmem_cache_flags(size, flags, name, ctor);
 	s->reserved = 0;
 
+	if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU))
+		s->reserved = sizeof(struct rcu_head);
+
 	if (!calculate_sizes(s, -1))
 		goto error;
 	if (disable_higher_order_debug) {
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html