On Mon, Aug 26, 2019 at 08:33:51PM +0200, gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 4.9-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

It actually applies, but it breaks the build :(

------------------ original commit in Linus's tree ------------------

...

From 701d678599d0c1623aaf4139c03eea260a75b027 Mon Sep 17 00:00:00 2001

From: Henry Burns henryburns@google.com Date: Sat, 24 Aug 2019 17:55:06 -0700 Subject: [PATCH] mm/zsmalloc.c: fix race condition in zs_destroy_pool

In zs_destroy_pool() we call flush_work(&pool->free_work). However, we have no guarantee that migration isn't happening in the background at that time.

Since migration can't directly free pages, it relies on free_work being scheduled to free the pages. But there's nothing preventing an in-progress migrate from queuing the work *after* zs_unregister_migration() has called flush_work(). Which would mean pages still pointing at the inode when we free it.

Since we know at destroy time all objects should be free, no new migrations can come in (since zs_page_isolate() fails for fully-free zspages). This means it is sufficient to track a "# isolated zspages" count by class, and have the destroy logic ensure all such pages have drained before proceeding. Keeping that state under the class spinlock keeps the logic straightforward.

In this case a memory leak could lead to an eventual crash if compaction hits the leaked page. This crash would only occur if people are changing their zswap backend at runtime (which eventually starts destruction).

Link: http://lkml.kernel.org/r/20190809181751.219326-2-henryburns@google.com Fixes: 48b4800a1c6a ("zsmalloc: page migration support") Signed-off-by: Henry Burns henryburns@google.com Reviewed-by: Sergey Senozhatsky sergey.senozhatsky@gmail.com Cc: Henry Burns henrywolfeburns@gmail.com Cc: Minchan Kim minchan@kernel.org Cc: Shakeel Butt shakeelb@google.com Cc: Jonathan Adams jwadams@google.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index 5105b9b66653..08def3a0d200 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -54,6 +54,7 @@ #include <linux/mount.h> #include <linux/pseudo_fs.h> #include <linux/migrate.h> +#include <linux/wait.h> #include <linux/pagemap.h> #include <linux/fs.h> @@ -268,6 +269,10 @@ struct zs_pool { #ifdef CONFIG_COMPACTION struct inode *inode; struct work_struct free_work;

• /* A wait queue for when migration races with async_free_zspage() */
• struct wait_queue_head migration_wait;
• atomic_long_t isolated_pages;
• bool destroying;

#endif }; @@ -1874,6 +1879,19 @@ static void putback_zspage_deferred(struct zs_pool *pool, } +static inline void zs_pool_dec_isolated(struct zs_pool *pool) +{

• VM_BUG_ON(atomic_long_read(&pool->isolated_pages) <= 0);
• atomic_long_dec(&pool->isolated_pages);
• /*

• * There's no possibility of racing, since wait_for_isolated_drain()
  

• * checks the isolated count under &class->lock after enqueuing
  

• * on migration_wait.
  

• */
  

• if (atomic_long_read(&pool->isolated_pages) == 0 && pool->destroying)

• wake_up_all(&pool->migration_wait);
  

+}

static void replace_sub_page(struct size_class *class, struct zspage *zspage, struct page *newpage, struct page *oldpage) { @@ -1943,6 +1961,7 @@ static bool zs_page_isolate(struct page *page, isolate_mode_t mode) */ if (!list_empty(&zspage->list) && !is_zspage_isolated(zspage)) { get_zspage_mapping(zspage, &class_idx, &fullness);

• atomic_long_inc(&pool->isolated_pages);
  

  remove_zspage(class, zspage, fullness); }

@@ -2042,8 +2061,16 @@ static int zs_page_migrate(struct address_space *mapping, struct page *newpage, * Page migration is done so let's putback isolated zspage to * the list if @page is final isolated subpage in the zspage. */

• if (!is_zspage_isolated(zspage))

• if (!is_zspage_isolated(zspage)) {

• /*
  

•  * We cannot race with zs_destroy_pool() here because we wait
  

•  * for isolation to hit zero before we start destroying.
  

•  * Also, we ensure that everyone can see pool->destroying before
  

•  * we start waiting.
  

•  */
  

  putback_zspage_deferred(pool, class, zspage);

• zs_pool_dec_isolated(pool);
  

• }

reset_page(page); put_page(page); @@ -2094,8 +2121,8 @@ static void zs_page_putback(struct page *page) * so let's defer. */ putback_zspage_deferred(pool, class, zspage);

• zs_pool_dec_isolated(pool);
  

  }

• spin_unlock(&class->lock);

} @@ -2118,8 +2145,36 @@ static int zs_register_migration(struct zs_pool *pool) return 0; } +static bool pool_isolated_are_drained(struct zs_pool *pool) +{

• return atomic_long_read(&pool->isolated_pages) == 0;

+}

+/* Function for resolving migration */ +static void wait_for_isolated_drain(struct zs_pool *pool) +{

• /*

• * We're in the process of destroying the pool, so there are no
  

• * active allocations. zs_page_isolate() fails for completely free
  

• * zspages, so we need only wait for the zs_pool's isolated
  

• * count to hit zero.
  

• */
  

• wait_event(pool->migration_wait,

•    pool_isolated_are_drained(pool));
  

+}

static void zs_unregister_migration(struct zs_pool *pool) {

• pool->destroying = true;
• /*

• * We need a memory barrier here to ensure global visibility of
  

• * pool->destroying. Thus pool->isolated pages will either be 0 in which
  

• * case we don't care, or it will be > 0 and pool->destroying will
  

• * ensure that we wake up once isolation hits 0.
  

• */
  

• smp_mb();
• wait_for_isolated_drain(pool); /* This can block */ flush_work(&pool->free_work); iput(pool->inode);

} @@ -2357,6 +2412,8 @@ struct zs_pool *zs_create_pool(const char *name) if (!pool->name) goto err;

• init_waitqueue_head(&pool->migration_wait);
• if (create_cache(pool)) goto err;