diff mbox series

[bpf-next,v3,1/2] libbpf: do not resolve size on duplicate FUNCs

Message ID 20241001-libbpf-dup-extern-funcs-v3-1-42f7774efbf3@hack3r.moe (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series BPF static linker: fix linking duplicate extern functions | expand

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netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/build_tools success Errors and warnings before: 4 this patch: 4
netdev/cc_maintainers warning 10 maintainers not CCed: sdf@fomichev.me eddyz87@gmail.com haoluo@google.com jolsa@kernel.org daniel@iogearbox.net song@kernel.org yonghong.song@linux.dev kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com
netdev/build_clang success Errors and warnings before: 7 this patch: 7
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Commit Message

Eric Long via B4 Relay Oct. 1, 2024, 3:55 a.m. UTC 
From: Eric Long <i@hack3r.moe>

FUNCs do not have sizes, thus currently btf__resolve_size will fail
with -EINVAL. Add conditions so that we only update size when the BTF
object is not function or function prototype.

Signed-off-by: Eric Long <i@hack3r.moe>
---
 tools/lib/bpf/linker.c | 4 ++++
 1 file changed, 4 insertions(+)

Comments

Andrii Nakryiko Oct. 1, 2024, 5:18 p.m. UTC | #1 
On Mon, Sep 30, 2024 at 8:55 PM Eric Long via B4 Relay
<devnull+i.hack3r.moe@kernel.org> wrote:
>
> From: Eric Long <i@hack3r.moe>
>
> FUNCs do not have sizes, thus currently btf__resolve_size will fail
> with -EINVAL. Add conditions so that we only update size when the BTF
> object is not function or function prototype.
>
> Signed-off-by: Eric Long <i@hack3r.moe>
> ---
>  tools/lib/bpf/linker.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
> index 81dbbdd79a7c65a4b048b85e1dba99cb5f7cb56b..ff249ba0ab067526e82d91481d21ec88a2732b4f 100644
> --- a/tools/lib/bpf/linker.c
> +++ b/tools/lib/bpf/linker.c
> @@ -2451,6 +2451,10 @@ static int linker_append_btf(struct bpf_linker *linker, struct src_obj *obj)
>                         if (glob_sym && glob_sym->var_idx >= 0) {
>                                 __s64 sz;
>
> +                               /* FUNCs don't have size, nothing to update */
> +                               if (btf_is_func(t) || btf_is_func_proto(t))

no, it should be *just* btf_is_func(), because that's what extern ksym
is producing. FUNC then points to FUNC_PROTO. So this is still a
sloppy check.

pw-bot: cr

> +                                       continue;
> +
>                                 dst_var = &dst_sec->sec_vars[glob_sym->var_idx];
>                                 /* Because underlying BTF type might have
>                                  * changed, so might its size have changed, so
>
> --
> 2.46.2
>
>
diff mbox series

Patch

diff --git a/tools/lib/bpf/linker.c b/tools/lib/bpf/linker.c
index 81dbbdd79a7c65a4b048b85e1dba99cb5f7cb56b..ff249ba0ab067526e82d91481d21ec88a2732b4f 100644
--- a/tools/lib/bpf/linker.c
+++ b/tools/lib/bpf/linker.c
@@ -2451,6 +2451,10 @@  static int linker_append_btf(struct bpf_linker *linker, struct src_obj *obj)
 			if (glob_sym && glob_sym->var_idx >= 0) {
 				__s64 sz;
 
+				/* FUNCs don't have size, nothing to update */
+				if (btf_is_func(t) || btf_is_func_proto(t))
+					continue;
+
 				dst_var = &dst_sec->sec_vars[glob_sym->var_idx];
 				/* Because underlying BTF type might have
 				 * changed, so might its size have changed, so