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libbpf: Fix parsing of multi-split BTF

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When creating multi-split BTF we correctly set the start string offset
to be the size of the base string section plus the base BTF start
string offset; the latter is needed for multi-split BTF since the
offset is non-zero there.

Unfortunately the BTF parsing case needed that logic and it was
missed.

Fixes: 4e29128a9ace ("libbpf/btf: Fix string handling to support multi-split BTF")
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251104203309.318429-2-alan.maguire@oracle.com
This commit is contained in:
Alan Maguire
2025-11-04 20:33:08 +00:00
committed by Andrii Nakryiko
parent 813fbe13ab
commit 0e14a12a1d
1 changed files with 2 additions and 2 deletions
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4
src/btf.c
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@@ -1061,7 +1061,7 @@ static struct btf *btf_new(const void *data, __u32 size, struct btf *base_btf, b
if (base_btf) {
btf->base_btf = base_btf;
btf->start_id = btf__type_cnt(base_btf);
btf->start_str_off = base_btf->hdr->str_len;
btf->start_str_off = base_btf->hdr->str_len + base_btf->start_str_off;
}
if (is_mmap) {
@@ -5818,7 +5818,7 @@ void btf_set_base_btf(struct btf *btf, const struct btf *base_btf)
{
btf->base_btf = (struct btf *)base_btf;
btf->start_id = btf__type_cnt(base_btf);
btf->start_str_off = base_btf->hdr->str_len;
btf->start_str_off = base_btf->hdr->str_len + base_btf->start_str_off;
}
int btf__relocate(struct btf *btf, const struct btf *base_btf)