[RFC PATCH bpf-next v3 2/7] bpf/syscall: allow key to be null in map functions

[Mauricio Vasquez B <mauricio.vasquez@polito.it>]

This commit adds the required logic to allow key being NULL
in case the key_size of the map is 0.

A new __bpf_copy_key function helper only copies the key from
userpsace when key_size != 0, otherwise it enforces that key must be
null.

Signed-off-by: Mauricio Vasquez B <mauricio.vasquez@polito.it>
---
 kernel/bpf/syscall.c |   19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 3c9636f03bb2..f2d4e4f280dc 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -651,6 +651,17 @@ int __weak bpf_stackmap_copy(struct bpf_map *map, void *key, void *value)
 	return -ENOTSUPP;
 }
 
+static void *__bpf_copy_key(void __user *ukey, u64 key_size)
+{
+	if (key_size)
+		return memdup_user(ukey, key_size);
+
+	if (ukey)
+		return ERR_PTR(-EINVAL);
+
+	return NULL;
+}
+
 /* last field in 'union bpf_attr' used by this command */
 #define BPF_MAP_LOOKUP_ELEM_LAST_FIELD value
 
@@ -678,7 +689,7 @@ static int map_lookup_elem(union bpf_attr *attr)
 		goto err_put;
 	}
 
-	key = memdup_user(ukey, map->key_size);
+	key = __bpf_copy_key(ukey, map->key_size);
 	if (IS_ERR(key)) {
 		err = PTR_ERR(key);
 		goto err_put;
@@ -766,7 +777,7 @@ static int map_update_elem(union bpf_attr *attr)
 		goto err_put;
 	}
 
-	key = memdup_user(ukey, map->key_size);
+	key = __bpf_copy_key(ukey, map->key_size);
 	if (IS_ERR(key)) {
 		err = PTR_ERR(key);
 		goto err_put;
@@ -864,7 +875,7 @@ static int map_delete_elem(union bpf_attr *attr)
 		goto err_put;
 	}
 
-	key = memdup_user(ukey, map->key_size);
+	key = __bpf_copy_key(ukey, map->key_size);
 	if (IS_ERR(key)) {
 		err = PTR_ERR(key);
 		goto err_put;
@@ -916,7 +927,7 @@ static int map_get_next_key(union bpf_attr *attr)
 	}
 
 	if (ukey) {
-		key = memdup_user(ukey, map->key_size);
+		key = __bpf_copy_key(ukey, map->key_size);
 		if (IS_ERR(key)) {
 			err = PTR_ERR(key);
 			goto err_put;