bpf-fixes

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Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Pull bpf fixes from Alexei Starovoitov:

 - Replace bpf_map_kmalloc_node() with kmalloc_nolock() to fix kmemleak
   imbalance in tracking of bpf_async_cb structures (Alexei Starovoitov)

 - Make selftests/bpf arg_parsing.c more robust to errors (Andrii
   Nakryiko)

 - Fix redefinition of 'off' as different kind of symbol when I40E
   driver is builtin (Brahmajit Das)

 - Do not disable preemption in bpf_test_run (Sahil Chandna)

 - Fix memory leak in __lookup_instance error path (Shardul Bankar)

 - Ensure test data is flushed to disk before reading it (Xing Guo)

* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  selftests/bpf: Fix redefinition of 'off' as different kind of symbol
  bpf: Do not disable preemption in bpf_test_run().
  bpf: Fix memory leak in __lookup_instance error path
  selftests: arg_parsing: Ensure data is flushed to disk before reading.
  bpf: Replace bpf_map_kmalloc_node() with kmalloc_nolock() to allocate bpf_async_cb structures.
  selftests/bpf: make arg_parsing.c more robust to crashes
  bpf: test_run: Fix ctx leak in bpf_prog_test_run_xdp error path

include/linux/bpf.h

@@ -2499,6 +2499,8 @@ int bpf_map_alloc_pages(const struct bpf_map *map, int nid,
 #ifdef CONFIG_MEMCG
 void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
 			   int node);
+void *bpf_map_kmalloc_nolock(const struct bpf_map *map, size_t size, gfp_t flags,
+			     int node);
 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags);
 void *bpf_map_kvcalloc(struct bpf_map *map, size_t n, size_t size,
 		       gfp_t flags);
@@ -2511,6 +2513,8 @@ void __percpu *bpf_map_alloc_percpu(const struct bpf_map *map, size_t size,
  */
 #define bpf_map_kmalloc_node(_map, _size, _flags, _node)	\
 		kmalloc_node(_size, _flags, _node)
+#define bpf_map_kmalloc_nolock(_map, _size, _flags, _node)	\
+		kmalloc_nolock(_size, _flags, _node)
 #define bpf_map_kzalloc(_map, _size, _flags)			\
 		kzalloc(_size, _flags)
 #define bpf_map_kvcalloc(_map, _n, _size, _flags)		\

kernel/bpf/helpers.c

@@ -1215,13 +1215,20 @@ static void bpf_wq_work(struct work_struct *work)
 	rcu_read_unlock_trace();
 }
 
+static void bpf_async_cb_rcu_free(struct rcu_head *rcu)
+{
+	struct bpf_async_cb *cb = container_of(rcu, struct bpf_async_cb, rcu);
+
+	kfree_nolock(cb);
+}
+
 static void bpf_wq_delete_work(struct work_struct *work)
 {
 	struct bpf_work *w = container_of(work, struct bpf_work, delete_work);
 
 	cancel_work_sync(&w->work);
 
-	kfree_rcu(w, cb.rcu);
+	call_rcu(&w->cb.rcu, bpf_async_cb_rcu_free);
 }
 
 static void bpf_timer_delete_work(struct work_struct *work)
@@ -1230,13 +1237,13 @@ static void bpf_timer_delete_work(struct work_struct *work)
 
 	/* Cancel the timer and wait for callback to complete if it was running.
 	 * If hrtimer_cancel() can be safely called it's safe to call
-	 * kfree_rcu(t) right after for both preallocated and non-preallocated
+	 * call_rcu() right after for both preallocated and non-preallocated
 	 * maps.  The async->cb = NULL was already done and no code path can see
 	 * address 't' anymore. Timer if armed for existing bpf_hrtimer before
 	 * bpf_timer_cancel_and_free will have been cancelled.
 	 */
 	hrtimer_cancel(&t->timer);
-	kfree_rcu(t, cb.rcu);
+	call_rcu(&t->cb.rcu, bpf_async_cb_rcu_free);
 }
 
 static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u64 flags,
@@ -1270,11 +1277,7 @@ static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u
 		goto out;
 	}
 
-	/* Allocate via bpf_map_kmalloc_node() for memcg accounting. Until
-	 * kmalloc_nolock() is available, avoid locking issues by using
-	 * __GFP_HIGH (GFP_ATOMIC & ~__GFP_RECLAIM).
-	 */
-	cb = bpf_map_kmalloc_node(map, size, __GFP_HIGH, map->numa_node);
+	cb = bpf_map_kmalloc_nolock(map, size, 0, map->numa_node);
 	if (!cb) {
 		ret = -ENOMEM;
 		goto out;
@@ -1315,7 +1318,7 @@ static int __bpf_async_init(struct bpf_async_kern *async, struct bpf_map *map, u
 		 * or pinned in bpffs.
 		 */
 		WRITE_ONCE(async->cb, NULL);
-		kfree(cb);
+		kfree_nolock(cb);
 		ret = -EPERM;
 	}
 out:
@@ -1580,7 +1583,7 @@ void bpf_timer_cancel_and_free(void *val)
 	 * timer _before_ calling us, such that failing to cancel it here will
 	 * cause it to possibly use struct hrtimer after freeing bpf_hrtimer.
 	 * Therefore, we _need_ to cancel any outstanding timers before we do
-	 * kfree_rcu, even though no more timers can be armed.
+	 * call_rcu, even though no more timers can be armed.
 	 *
 	 * Moreover, we need to schedule work even if timer does not belong to
 	 * the calling callback_fn, as on two different CPUs, we can end up in a
@@ -1607,7 +1610,7 @@ void bpf_timer_cancel_and_free(void *val)
 		 * completion.
 		 */
 		if (hrtimer_try_to_cancel(&t->timer) >= 0)
-			kfree_rcu(t, cb.rcu);
+			call_rcu(&t->cb.rcu, bpf_async_cb_rcu_free);
 		else
 			queue_work(system_dfl_wq, &t->cb.delete_work);
 	} else {

kernel/bpf/liveness.c

@@ -195,8 +195,10 @@ static struct func_instance *__lookup_instance(struct bpf_verifier_env *env,
 		return ERR_PTR(-ENOMEM);
 	result->must_write_set = kvcalloc(subprog_sz, sizeof(*result->must_write_set),
 					  GFP_KERNEL_ACCOUNT);
-	if (!result->must_write_set)
+	if (!result->must_write_set) {
+		kvfree(result);
 		return ERR_PTR(-ENOMEM);
+	}
 	memcpy(&result->callchain, callchain, sizeof(*callchain));
 	result->insn_cnt = subprog_sz;
 	hash_add(liveness->func_instances, &result->hl_node, key);

kernel/bpf/syscall.c

@@ -520,6 +520,21 @@ void *bpf_map_kmalloc_node(const struct bpf_map *map, size_t size, gfp_t flags,
 	return ptr;
 }
 
+void *bpf_map_kmalloc_nolock(const struct bpf_map *map, size_t size, gfp_t flags,
+			     int node)
+{
+	struct mem_cgroup *memcg, *old_memcg;
+	void *ptr;
+
+	memcg = bpf_map_get_memcg(map);
+	old_memcg = set_active_memcg(memcg);
+	ptr = kmalloc_nolock(size, flags | __GFP_ACCOUNT, node);
+	set_active_memcg(old_memcg);
+	mem_cgroup_put(memcg);
+
+	return ptr;
+}
+
 void *bpf_map_kzalloc(const struct bpf_map *map, size_t size, gfp_t flags)
 {
 	struct mem_cgroup *memcg, *old_memcg;

net/bpf/test_run.c

@@ -29,7 +29,6 @@
 #include <trace/events/bpf_test_run.h>
 
 struct bpf_test_timer {
-	enum { NO_PREEMPT, NO_MIGRATE } mode;
 	u32 i;
 	u64 time_start, time_spent;
 };
@@ -37,12 +36,7 @@ struct bpf_test_timer {
 static void bpf_test_timer_enter(struct bpf_test_timer *t)
 	__acquires(rcu)
 {
-	rcu_read_lock();
-	if (t->mode == NO_PREEMPT)
-		preempt_disable();
-	else
-		migrate_disable();
-
+	rcu_read_lock_dont_migrate();
 	t->time_start = ktime_get_ns();
 }
 
@@ -50,12 +44,7 @@ static void bpf_test_timer_leave(struct bpf_test_timer *t)
 	__releases(rcu)
 {
 	t->time_start = 0;
-
-	if (t->mode == NO_PREEMPT)
-		preempt_enable();
-	else
-		migrate_enable();
-	rcu_read_unlock();
+	rcu_read_unlock_migrate();
 }
 
 static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
@@ -374,7 +363,7 @@ static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
 
 {
 	struct xdp_test_data xdp = { .batch_size = batch_size };
-	struct bpf_test_timer t = { .mode = NO_MIGRATE };
+	struct bpf_test_timer t = {};
 	int ret;
 
 	if (!repeat)
@@ -404,7 +393,7 @@ static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
 	struct bpf_prog_array_item item = {.prog = prog};
 	struct bpf_run_ctx *old_ctx;
 	struct bpf_cg_run_ctx run_ctx;
-	struct bpf_test_timer t = { NO_MIGRATE };
+	struct bpf_test_timer t = {};
 	enum bpf_cgroup_storage_type stype;
 	int ret;
 
@@ -1269,7 +1258,7 @@ int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 		goto free_ctx;
 
 	if (kattr->test.data_size_in - meta_sz < ETH_HLEN)
-		return -EINVAL;
+		goto free_ctx;
 
 	data = bpf_test_init(kattr, linear_sz, max_linear_sz, headroom, tailroom);
 	if (IS_ERR(data)) {
@@ -1377,7 +1366,7 @@ int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 				     const union bpf_attr *kattr,
 				     union bpf_attr __user *uattr)
 {
-	struct bpf_test_timer t = { NO_PREEMPT };
+	struct bpf_test_timer t = {};
 	u32 size = kattr->test.data_size_in;
 	struct bpf_flow_dissector ctx = {};
 	u32 repeat = kattr->test.repeat;
@@ -1445,7 +1434,7 @@ out:
 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
 				union bpf_attr __user *uattr)
 {
-	struct bpf_test_timer t = { NO_PREEMPT };
+	struct bpf_test_timer t = {};
 	struct bpf_prog_array *progs = NULL;
 	struct bpf_sk_lookup_kern ctx = {};
 	u32 repeat = kattr->test.repeat;

tools/testing/selftests/bpf/prog_tests/arg_parsing.c

@@ -144,11 +144,17 @@ static void test_parse_test_list_file(void)
 	if (!ASSERT_OK(ferror(fp), "prepare tmp"))
 		goto out_fclose;
 
+	if (!ASSERT_OK(fsync(fileno(fp)), "fsync tmp"))
+		goto out_fclose;
+
 	init_test_filter_set(&set);
 
-	ASSERT_OK(parse_test_list_file(tmpfile, &set, true), "parse file");
+	if (!ASSERT_OK(parse_test_list_file(tmpfile, &set, true), "parse file"))
+		goto out_fclose;
+
+	if (!ASSERT_EQ(set.cnt, 4, "test  count"))
+		goto out_free_set;
 
-	ASSERT_EQ(set.cnt, 4, "test  count");
 	ASSERT_OK(strcmp("test_with_spaces", set.tests[0].name), "test 0 name");
 	ASSERT_EQ(set.tests[0].subtest_cnt, 0, "test 0 subtest count");
 	ASSERT_OK(strcmp("testA", set.tests[1].name), "test 1 name");
@@ -158,8 +164,8 @@ static void test_parse_test_list_file(void)
 	ASSERT_OK(strcmp("testB", set.tests[2].name), "test 2 name");
 	ASSERT_OK(strcmp("testC_no_eof_newline", set.tests[3].name), "test 3 name");
 
+out_free_set:
 	free_test_filter_set(&set);
-
 out_fclose:
 	fclose(fp);
 out_remove:

tools/testing/selftests/bpf/progs/verifier_global_ptr_args.c

@@ -225,7 +225,7 @@ int trusted_to_untrusted(void *ctx)
 }
 
 char mem[16];
-u32 off;
+u32 offset;
 
 SEC("tp_btf/sys_enter")
 __success
@@ -240,9 +240,9 @@ int anything_to_untrusted(void *ctx)
 	/* scalar to untrusted */
 	subprog_untrusted(0);
 	/* variable offset to untrusted (map) */
-	subprog_untrusted((void *)mem + off);
+	subprog_untrusted((void *)mem + offset);
 	/* variable offset to untrusted (trusted) */
-	subprog_untrusted((void *)bpf_get_current_task_btf() + off);
+	subprog_untrusted((void *)bpf_get_current_task_btf() + offset);
 	return 0;
 }
 
@@ -298,12 +298,12 @@ int anything_to_untrusted_mem(void *ctx)
 	/* scalar to untrusted mem */
 	subprog_void_untrusted(0);
 	/* variable offset to untrusted mem (map) */
-	subprog_void_untrusted((void *)mem + off);
+	subprog_void_untrusted((void *)mem + offset);
 	/* variable offset to untrusted mem (trusted) */
-	subprog_void_untrusted(bpf_get_current_task_btf() + off);
+	subprog_void_untrusted(bpf_get_current_task_btf() + offset);
 	/* variable offset to untrusted char/enum (map) */
-	subprog_char_untrusted(mem + off);
-	subprog_enum_untrusted((void *)mem + off);
+	subprog_char_untrusted(mem + offset);
+	subprog_enum_untrusted((void *)mem + offset);
 	return 0;
 }