From: Jakub Kicinski Date: Fri, 4 May 2018 01:37:11 +0000 (-0700) Subject: bpf: replace map pointer loads before calling into offloads X-Git-Tag: v4.19~872^2~304^2~1^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f4e3ec0d573e238f383b3da365127002579a07d6;p=platform%2Fkernel%2Flinux-rpi.git bpf: replace map pointer loads before calling into offloads Offloads may find host map pointers more useful than map fds. Map pointers can be used to identify the map, while fds are only valid within the context of loading process. Jump to skip_full_check on error in case verifier log overflow has to be handled (replace_map_fd_with_map_ptr() prints to the log, driver prep may do that too in the future). Signed-off-by: Jakub Kicinski Reviewed-by: Quentin Monnet Reviewed-by: Jiong Wang Signed-off-by: Daniel Borkmann --- diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 37e0aff..ccac552 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -5741,16 +5741,16 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr) if (!IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)) env->strict_alignment = true; + ret = replace_map_fd_with_map_ptr(env); + if (ret < 0) + goto skip_full_check; + if (bpf_prog_is_dev_bound(env->prog->aux)) { ret = bpf_prog_offload_verifier_prep(env); if (ret) - goto err_unlock; + goto skip_full_check; } - ret = replace_map_fd_with_map_ptr(env); - if (ret < 0) - goto skip_full_check; - env->explored_states = kcalloc(env->prog->len, sizeof(struct bpf_verifier_state_list *), GFP_USER);