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bpf: Fix elem_size not being set for inner maps

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Commit d937bc3449 ("bpf: make uniform use of array->elem_size
everywhere in arraymap.c") changed array_map_gen_lookup to use
array->elem_size instead of round_up(map->value_size, 8) as the element
size when generating code to access a value in an array map.

array->elem_size, however, is not set by bpf_map_meta_alloc when
initializing an BPF_MAP_TYPE_ARRAY_OF_MAPS or BPF_MAP_TYPE_HASH_OF_MAPS.
This results in array_map_gen_lookup incorrectly outputting code that
always accesses index 0 in the array (as the index will be calculated
via a multiplication with the element size, which is incorrectly set to
0).

Set elem_size on the bpf_array object when allocating an array or hash
of maps to fix this.

Fixes: d937bc3449 ("bpf: make uniform use of array->elem_size everywhere in arraymap.c")
Signed-off-by: Rhys Rustad-Elliott <me@rhysre.net>
Link: https://lore.kernel.org/r/20230602190110.47068-2-me@rhysre.net
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Rhys Rustad-Elliott 2023-06-02 19:02:02 +00:00 committed by Martin KaFai Lau
parent b0fd1852bc
commit cba41bb78d
1 changed files with 6 additions and 2 deletions
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8
kernel/bpf/map_in_map.c
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@ -69,9 +69,13 @@ struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
/* Misc members not needed in bpf_map_meta_equal() check. */ /* Misc members not needed in bpf_map_meta_equal() check. */
inner_map_meta->ops = inner_map->ops; inner_map_meta->ops = inner_map->ops;
if (inner_map->ops == &array_map_ops) { if (inner_map->ops == &array_map_ops) {
struct bpf_array *inner_array_meta =
container_of(inner_map_meta, struct bpf_array, map);
struct bpf_array *inner_array = container_of(inner_map, struct bpf_array, map);
inner_array_meta->index_mask = inner_array->index_mask;
inner_array_meta->elem_size = inner_array->elem_size;
inner_map_meta->bypass_spec_v1 = inner_map->bypass_spec_v1; inner_map_meta->bypass_spec_v1 = inner_map->bypass_spec_v1;
container_of(inner_map_meta, struct bpf_array, map)->index_mask =
container_of(inner_map, struct bpf_array, map)->index_mask;
} }
fdput(f); fdput(f);