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bpf: move arg:ctx type enforcement check inside the main logic loop

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Now that bpf and bpf-next trees converged and we don't run the risk of
merge conflicts, move btf_validate_prog_ctx_type() into its most logical
place inside the main logic loop.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240125205510.3642094-4-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2024-01-25 12:55:06 -08:00 committed by Alexei Starovoitov
parent 9eea8fafe3
commit add9c58cd4
1 changed files with 4 additions and 17 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

21
kernel/bpf/btf.c
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@ -7112,6 +7112,10 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog)
bpf_log(log, "arg#%d has invalid combination of tags\n", i);
return -EINVAL;
}
if ((tags & ARG_TAG_CTX) &&
btf_validate_prog_ctx_type(log, btf, t, i, prog_type,
prog->expected_attach_type))
return -EINVAL;
sub->args[i].arg_type = ARG_PTR_TO_CTX;
continue;
}
@ -7156,23 +7160,6 @@ int btf_prepare_func_args(struct bpf_verifier_env *env, int subprog)
return -EINVAL;
}
for (i = 0; i < nargs; i++) {
const char *tag;
if (sub->args[i].arg_type != ARG_PTR_TO_CTX)
continue;
/* check if arg has "arg:ctx" tag */
t = btf_type_by_id(btf, args[i].type);
tag = btf_find_decl_tag_value(btf, fn_t, i, "arg:");
if (IS_ERR_OR_NULL(tag) || strcmp(tag, "ctx") != 0)
continue;
if (btf_validate_prog_ctx_type(log, btf, t, i, prog_type,
prog->expected_attach_type))
return -EINVAL;
}
sub->arg_cnt = nargs;
sub->args_cached = true;