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libbpf: Tighten BTF type ID rewriting with error checking
author
Andrii Nakryiko
<andrii@kernel.org>
Fri, 23 Apr 2021 18:13:40 +0000
(11:13 -0700)
committer
Alexei Starovoitov
<ast@kernel.org>
Fri, 23 Apr 2021 21:05:27 +0000
(14:05 -0700)
It should never fail, but if it does, it's better to know about this rather
than end up with nonsensical type IDs.
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link:
https://lore.kernel.org/bpf/20210423181348.1801389-11-andrii@kernel.org
tools/lib/bpf/linker.c
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diff --git
a/tools/lib/bpf/linker.c
b/tools/lib/bpf/linker.c
index
b0e0384
..
5505c85
100644
(file)
--- a/
tools/lib/bpf/linker.c
+++ b/
tools/lib/bpf/linker.c
@@
-1429,6
+1429,13
@@
static int linker_fixup_btf(struct src_obj *obj)
static int remap_type_id(__u32 *type_id, void *ctx)
{
int *id_map = ctx;
+ int new_id = id_map[*type_id];
+
+ /* Error out if the type wasn't remapped. Ignore VOID which stays VOID. */
+ if (new_id == 0 && *type_id != 0) {
+ pr_warn("failed to find new ID mapping for original BTF type ID %u\n", *type_id);
+ return -EINVAL;
+ }
*type_id = id_map[*type_id];