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btf: add support for VAR and DATASEC in btf_dedup() 

This patch adds support for VAR and DATASEC in btf_dedup(). VAR/DATASEC
are never deduplicated, but they need to be processed anyway as types
they refer to might need to be remapped due to deduplication and
compaction.

Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Yonghong Song <yhs@fb.com>
Cc: Alexei Starovoitov <ast@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko 2019-04-15 16:48:07 -07:00 committed by Daniel Borkmann
parent 68e5ab1fc8
commit 189cf5a4a7
1 changed files with 27 additions and 2 deletions
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29
tools/lib/bpf/btf.c
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@ -1354,8 +1354,16 @@ static struct btf_dedup *btf_dedup_new(struct btf *btf, struct btf_ext *btf_ext,
}
/* special BTF "void" type is made canonical immediately */
d->map[0] = 0;
for (i = 1; i <= btf->nr_types; i++)
d->map[i] = BTF_UNPROCESSED_ID;
for (i = 1; i <= btf->nr_types; i++) {
struct btf_type *t = d->btf->types[i];
__u16 kind = BTF_INFO_KIND(t->info);
/* VAR and DATASEC are never deduped and are self-canonical */
if (kind == BTF_KIND_VAR || kind == BTF_KIND_DATASEC)
d->map[i] = i;
else
d->map[i] = BTF_UNPROCESSED_ID;
}
d->hypot_map = malloc(sizeof(__u32) * (1 + btf->nr_types));
if (!d->hypot_map) {
@ -1946,6 +1954,8 @@ static int btf_dedup_prim_type(struct btf_dedup *d, __u32 type_id)
case BTF_KIND_UNION:
case BTF_KIND_FUNC:
case BTF_KIND_FUNC_PROTO:
case BTF_KIND_VAR:
case BTF_KIND_DATASEC:
return 0;
case BTF_KIND_INT:
@ -2699,6 +2709,7 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
case BTF_KIND_PTR:
case BTF_KIND_TYPEDEF:
case BTF_KIND_FUNC:
case BTF_KIND_VAR:
r = btf_dedup_remap_type_id(d, t->type);
if (r < 0)
return r;
@ -2753,6 +2764,20 @@ static int btf_dedup_remap_type(struct btf_dedup *d, __u32 type_id)
break;
}
case BTF_KIND_DATASEC: {
struct btf_var_secinfo *var = (struct btf_var_secinfo *)(t + 1);
__u16 vlen = BTF_INFO_VLEN(t->info);
for (i = 0; i < vlen; i++) {
r = btf_dedup_remap_type_id(d, var->type);
if (r < 0)
return r;
var->type = r;
var++;
}
break;
}
default:
return -EINVAL;
}