From: "Liam R. Howlett" <Liam.Howlett@oracle.com>
Date: Mon, 27 Feb 2023 09:36:04 -0800
Subject: [PATCH] maple_tree: fix write memory barrier of nodes once dead for
RCU mode
References: bsc#1012628
Patch-mainline: 6.2.12
Git-commit: c13af03de46ba27674dd9fb31a17c0d480081139
[ Upstream commit c13af03de46ba27674dd9fb31a17c0d480081139 ]
During the development of the maple tree, the strategy of freeing multiple
nodes changed and, in the process, the pivots were reused to store
pointers to dead nodes. To ensure the readers see accurate pivots, the
writers need to mark the nodes as dead and call smp_wmb() to ensure any
readers can identify the node as dead before using the pivot values.
There were two places where the old method of marking the node as dead
without smp_wmb() were being used, which resulted in RCU readers seeing
the wrong pivot value before seeing the node was dead. Fix this race
condition by using mte_set_node_dead() which has the smp_wmb() call to
ensure the race is closed.
Add a WARN_ON() to the ma_free_rcu() call to ensure all nodes being freed
are marked as dead to ensure there are no other call paths besides the two
updated paths.
This is necessary for the RCU mode of the maple tree.
Link: https://lkml.kernel.org/r/20230227173632.3292573-6-surenb@google.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
lib/maple_tree.c | 7 +++++--
tools/testing/radix-tree/maple.c | 16 ++++++++++++++++
2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index fb452873..022573f4 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -178,7 +178,7 @@ static void mt_free_rcu(struct rcu_head *head)
*/
static void ma_free_rcu(struct maple_node *node)
{
- node->parent = ma_parent_ptr(node);
+ WARN_ON(node->parent != ma_parent_ptr(node));
call_rcu(&node->rcu, mt_free_rcu);
}
@@ -1785,8 +1785,10 @@ static inline void mas_replace(struct ma_state *mas, bool advanced)
rcu_assign_pointer(slots[offset], mas->node);
}
- if (!advanced)
+ if (!advanced) {
+ mte_set_node_dead(old_enode);
mas_free(mas, old_enode);
+ }
}
/*
@@ -4221,6 +4223,7 @@ static inline bool mas_wr_node_store(struct ma_wr_state *wr_mas)
done:
mas_leaf_set_meta(mas, newnode, dst_pivots, maple_leaf_64, new_end);
if (in_rcu) {
+ mte_set_node_dead(mas->node);
mas->node = mt_mk_node(newnode, wr_mas->type);
mas_replace(mas, false);
} else {
diff --git a/tools/testing/radix-tree/maple.c b/tools/testing/radix-tree/maple.c
index 1f36bc1c..2a16939c 100644
--- a/tools/testing/radix-tree/maple.c
+++ b/tools/testing/radix-tree/maple.c
@@ -108,6 +108,7 @@ static noinline void check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, mn->slot[1] != NULL);
MT_BUG_ON(mt, mas_allocated(&mas) != 0);
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mas.node = MAS_START;
mas_nomem(&mas, GFP_KERNEL);
@@ -160,6 +161,7 @@ static noinline void check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, mas_allocated(&mas) != i);
MT_BUG_ON(mt, !mn);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
@@ -192,6 +194,7 @@ static noinline void check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, not_empty(mn));
MT_BUG_ON(mt, mas_allocated(&mas) != i - 1);
MT_BUG_ON(mt, !mn);
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
@@ -210,6 +213,7 @@ static noinline void check_new_node(struct maple_tree *mt)
mn = mas_pop_node(&mas);
MT_BUG_ON(mt, not_empty(mn));
MT_BUG_ON(mt, mas_allocated(&mas) != j - 1);
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
MT_BUG_ON(mt, mas_allocated(&mas) != 0);
@@ -233,6 +237,7 @@ static noinline void check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, mas_allocated(&mas) != i - j);
mn = mas_pop_node(&mas);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
MT_BUG_ON(mt, mas_allocated(&mas) != i - j - 1);
}
@@ -269,6 +274,7 @@ static noinline void check_new_node(struct maple_tree *mt)
mn = mas_pop_node(&mas); /* get the next node. */
MT_BUG_ON(mt, mn == NULL);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
MT_BUG_ON(mt, mas_allocated(&mas) != 0);
@@ -294,6 +300,7 @@ static noinline void check_new_node(struct maple_tree *mt)
mn = mas_pop_node(&mas2); /* get the next node. */
MT_BUG_ON(mt, mn == NULL);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
MT_BUG_ON(mt, mas_allocated(&mas2) != 0);
@@ -334,10 +341,12 @@ static noinline void check_new_node(struct maple_tree *mt)
MT_BUG_ON(mt, mas_allocated(&mas) != MAPLE_ALLOC_SLOTS + 2);
mn = mas_pop_node(&mas);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
for (i = 1; i <= MAPLE_ALLOC_SLOTS + 1; i++) {
mn = mas_pop_node(&mas);
MT_BUG_ON(mt, not_empty(mn));
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
}
MT_BUG_ON(mt, mas_allocated(&mas) != 0);
@@ -375,6 +384,7 @@ static noinline void check_new_node(struct maple_tree *mt)
mas_node_count(&mas, i); /* Request */
mas_nomem(&mas, GFP_KERNEL); /* Fill request */
mn = mas_pop_node(&mas); /* get the next node. */
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mas_destroy(&mas);
@@ -382,10 +392,13 @@ static noinline void check_new_node(struct maple_tree *mt)
mas_node_count(&mas, i); /* Request */
mas_nomem(&mas, GFP_KERNEL); /* Fill request */
mn = mas_pop_node(&mas); /* get the next node. */
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mn = mas_pop_node(&mas); /* get the next node. */
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mn = mas_pop_node(&mas); /* get the next node. */
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
mas_destroy(&mas);
}
@@ -35369,6 +35382,7 @@ static noinline void check_prealloc(struct maple_tree *mt)
MT_BUG_ON(mt, allocated != 1 + height * 3);
mn = mas_pop_node(&mas);
MT_BUG_ON(mt, mas_allocated(&mas) != allocated - 1);
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
mas_destroy(&mas);
@@ -35386,6 +35400,7 @@ static noinline void check_prealloc(struct maple_tree *mt)
mas_destroy(&mas);
allocated = mas_allocated(&mas);
MT_BUG_ON(mt, allocated != 0);
+ mn->parent = ma_parent_ptr(mn);
ma_free_rcu(mn);
MT_BUG_ON(mt, mas_preallocate(&mas, ptr, GFP_KERNEL) != 0);
@@ -35756,6 +35771,7 @@ void farmer_tests(void)
tree.ma_root = mt_mk_node(node, maple_leaf_64);
mt_dump(&tree);
+ node->parent = ma_parent_ptr(node);
ma_free_rcu(node);
/* Check things that will make lockdep angry */
--
2.35.3