From: Vitaly Wool vitalywool@gmail.com Subject: z3fold: fix retry mechanism in page reclaim

z3fold_page_reclaim()'s retry mechanism is broken: on a second iteration it will have zhdr from the first one so that zhdr is no longer in line with struct page. That leads to crashes when the system is stressed.

Fix that by moving zhdr assignment up.

While at it, protect against using already freed handles by using own local slots structure in z3fold_page_reclaim().

Link: http://lkml.kernel.org/r/20190908162919.830388dc7404d1e2c80f4095@gmail.com Signed-off-by: Vitaly Wool vitalywool@gmail.com Reported-by: Markus Linnala markus.linnala@gmail.com Reported-by: Chris Murphy bugzilla@colorremedies.com Reported-by: Agustin Dall'Alba agustin@dallalba.com.ar Cc: "Maciej S. Szmigiero" mail@maciej.szmigiero.name Cc: Shakeel Butt shakeelb@google.com Cc: Henry Burns henrywolfeburns@gmail.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

mm/z3fold.c | 49 ++++++++++++++++++++++++++++++++++--------------- 1 file changed, 34 insertions(+), 15 deletions(-)

--- a/mm/z3fold.c~z3fold-fix-retry-mechanism-in-page-reclaim +++ a/mm/z3fold.c @@ -366,9 +366,10 @@ static inline int __idx(struct z3fold_he * Encodes the handle of a particular buddy within a z3fold page * Pool lock should be held as this function accesses first_num */ -static unsigned long encode_handle(struct z3fold_header *zhdr, enum buddy bud) +static unsigned long __encode_handle(struct z3fold_header *zhdr, + struct z3fold_buddy_slots *slots, + enum buddy bud) { - struct z3fold_buddy_slots *slots; unsigned long h = (unsigned long)zhdr; int idx = 0;

@@ -385,11 +386,15 @@ static unsigned long encode_handle(struc if (bud == LAST) h |= (zhdr->last_chunks << BUDDY_SHIFT);

- slots = zhdr->slots; slots->slot[idx] = h; return (unsigned long)&slots->slot[idx]; }

+static unsigned long encode_handle(struct z3fold_header *zhdr, enum buddy bud) +{ + return __encode_handle(zhdr, zhdr->slots, bud); +} + /* Returns the z3fold page where a given handle is stored */ static inline struct z3fold_header *handle_to_z3fold_header(unsigned long h) { @@ -624,6 +629,7 @@ static void do_compact_page(struct z3fol }

if (unlikely(PageIsolated(page) || + test_bit(PAGE_CLAIMED, &page->private) || test_bit(PAGE_STALE, &page->private))) { z3fold_page_unlock(zhdr); return; @@ -1100,6 +1106,7 @@ static int z3fold_reclaim_page(struct z3 struct z3fold_header *zhdr = NULL; struct page *page = NULL; struct list_head *pos; + struct z3fold_buddy_slots slots; unsigned long first_handle = 0, middle_handle = 0, last_handle = 0;

spin_lock(&pool->lock); @@ -1118,16 +1125,22 @@ static int z3fold_reclaim_page(struct z3 /* this bit could have been set by free, in which case * we pass over to the next page in the pool. */ - if (test_and_set_bit(PAGE_CLAIMED, &page->private)) + if (test_and_set_bit(PAGE_CLAIMED, &page->private)) { + page = NULL; continue; + }

- if (unlikely(PageIsolated(page))) + if (unlikely(PageIsolated(page))) { + clear_bit(PAGE_CLAIMED, &page->private); + page = NULL; continue; + } + zhdr = page_address(page); if (test_bit(PAGE_HEADLESS, &page->private)) break;

- zhdr = page_address(page); if (!z3fold_page_trylock(zhdr)) { + clear_bit(PAGE_CLAIMED, &page->private); zhdr = NULL; continue; /* can't evict at this point */ } @@ -1145,26 +1158,30 @@ static int z3fold_reclaim_page(struct z3

if (!test_bit(PAGE_HEADLESS, &page->private)) { /* - * We need encode the handles before unlocking, since - * we can race with free that will set - * (first|last)_chunks to 0 + * We need encode the handles before unlocking, and + * use our local slots structure because z3fold_free + * can zero out zhdr->slots and we can't do much + * about that */ first_handle = 0; last_handle = 0; middle_handle = 0; if (zhdr->first_chunks) - first_handle = encode_handle(zhdr, FIRST); + first_handle = __encode_handle(zhdr, &slots, + FIRST); if (zhdr->middle_chunks) - middle_handle = encode_handle(zhdr, MIDDLE); + middle_handle = __encode_handle(zhdr, &slots, + MIDDLE); if (zhdr->last_chunks) - last_handle = encode_handle(zhdr, LAST); + last_handle = __encode_handle(zhdr, &slots, + LAST); /* * it's safe to unlock here because we hold a * reference to this page */ z3fold_page_unlock(zhdr); } else { - first_handle = encode_handle(zhdr, HEADLESS); + first_handle = __encode_handle(zhdr, &slots, HEADLESS); last_handle = middle_handle = 0; }

@@ -1194,9 +1211,9 @@ next: spin_lock(&pool->lock); list_add(&page->lru, &pool->lru); spin_unlock(&pool->lock); + clear_bit(PAGE_CLAIMED, &page->private); } else { z3fold_page_lock(zhdr); - clear_bit(PAGE_CLAIMED, &page->private); if (kref_put(&zhdr->refcount, release_z3fold_page_locked)) { atomic64_dec(&pool->pages_nr); @@ -1211,6 +1228,7 @@ next: list_add(&page->lru, &pool->lru); spin_unlock(&pool->lock); z3fold_page_unlock(zhdr); + clear_bit(PAGE_CLAIMED, &page->private); }

/* We started off locked to we need to lock the pool back */ @@ -1315,7 +1333,8 @@ static bool z3fold_page_isolate(struct p VM_BUG_ON_PAGE(!PageMovable(page), page); VM_BUG_ON_PAGE(PageIsolated(page), page);

- if (test_bit(PAGE_HEADLESS, &page->private)) + if (test_bit(PAGE_HEADLESS, &page->private) || + test_bit(PAGE_CLAIMED, &page->private)) return false;

zhdr = page_address(page); _