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Date: Fri, 20 Dec 2019 22:25:59 -0800 From: Martin KaFai Lau <kafai@...com> To: <bpf@...r.kernel.org> CC: Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, David Miller <davem@...emloft.net>, <kernel-team@...com>, <netdev@...r.kernel.org> Subject: [PATCH bpf-next v2 02/11] bpf: Avoid storing modifier to info->btf_id info->btf_id expects the btf_id of a struct, so it should store the final result after skipping modifiers (if any). It also takes this chanace to add a missing newline in one of the bpf_log() messages. Acked-by: Yonghong Song <yhs@...com> Signed-off-by: Martin KaFai Lau <kafai@...com> --- kernel/bpf/btf.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c index 7d40da240891..88359a4bccb0 100644 --- a/kernel/bpf/btf.c +++ b/kernel/bpf/btf.c @@ -3696,7 +3696,6 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type, /* this is a pointer to another type */ info->reg_type = PTR_TO_BTF_ID; - info->btf_id = t->type; if (tgt_prog) { ret = btf_translate_to_vmlinux(log, btf, t, tgt_prog->type); @@ -3707,10 +3706,14 @@ bool btf_ctx_access(int off, int size, enum bpf_access_type type, return false; } } + + info->btf_id = t->type; t = btf_type_by_id(btf, t->type); /* skip modifiers */ - while (btf_type_is_modifier(t)) + while (btf_type_is_modifier(t)) { + info->btf_id = t->type; t = btf_type_by_id(btf, t->type); + } if (!btf_type_is_struct(t)) { bpf_log(log, "func '%s' arg%d type %s is not a struct\n", @@ -3736,7 +3739,7 @@ int btf_struct_access(struct bpf_verifier_log *log, again: tname = __btf_name_by_offset(btf_vmlinux, t->name_off); if (!btf_type_is_struct(t)) { - bpf_log(log, "Type '%s' is not a struct", tname); + bpf_log(log, "Type '%s' is not a struct\n", tname); return -EINVAL; } -- 2.17.1
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