From f45d5b6ce2e835834c94b8b700787984f02cd662 Mon Sep 17 00:00:00 2001 From: Toke Hoiland-Jorgensen Date: Fri, 21 Jan 2022 11:10:02 +0100 Subject: bpf: generalise tail call map compatibility check The check for tail call map compatibility ensures that tail calls only happen between maps of the same type. To ensure backwards compatibility for XDP frags we need a similar type of check for cpumap and devmap programs, so move the state from bpf_array_aux into bpf_map, add xdp_has_frags to the check, and apply the same check to cpumap and devmap. Acked-by: John Fastabend Co-developed-by: Lorenzo Bianconi Signed-off-by: Lorenzo Bianconi Signed-off-by: Toke Hoiland-Jorgensen Link: https://lore.kernel.org/r/f19fd97c0328a39927f3ad03e1ca6b43fd53cdfd.1642758637.git.lorenzo@kernel.org Signed-off-by: Alexei Starovoitov --- kernel/bpf/arraymap.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'kernel/bpf/arraymap.c') diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c index c7a5be3bf8be..7f145aefbff8 100644 --- a/kernel/bpf/arraymap.c +++ b/kernel/bpf/arraymap.c @@ -837,13 +837,12 @@ static int fd_array_map_delete_elem(struct bpf_map *map, void *key) static void *prog_fd_array_get_ptr(struct bpf_map *map, struct file *map_file, int fd) { - struct bpf_array *array = container_of(map, struct bpf_array, map); struct bpf_prog *prog = bpf_prog_get(fd); if (IS_ERR(prog)) return prog; - if (!bpf_prog_array_compatible(array, prog)) { + if (!bpf_prog_map_compatible(map, prog)) { bpf_prog_put(prog); return ERR_PTR(-EINVAL); } @@ -1071,7 +1070,6 @@ static struct bpf_map *prog_array_map_alloc(union bpf_attr *attr) INIT_WORK(&aux->work, prog_array_map_clear_deferred); INIT_LIST_HEAD(&aux->poke_progs); mutex_init(&aux->poke_mutex); - spin_lock_init(&aux->owner.lock); map = array_map_alloc(attr); if (IS_ERR(map)) { -- cgit v1.2.3