selftests/bpf: Use the correct destructor kfunc type

With CONFIG_CFI enabled, the kernel strictly enforces that indirect
function calls use a function pointer type that matches the target
function. As bpf_testmod_ctx_release() signature differs from the
btf_dtor_kfunc_t pointer type used for the destructor calls in
bpf_obj_free_fields(), add a stub function with the correct type to
fix the type mismatch.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Acked-by: Yonghong Song <yonghong.song@linux.dev>
Link: https://lore.kernel.org/r/20260110082548.113748-9-samitolvanen@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c b/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
index 1c41d03bd5a1b829f619e4b9da0384ca54a51c38..bc07ce9d5477cf0458a17fb2d3c4fc9b01ed83ed 100644 (file)
--- a/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
+++ b/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c
@@ -285,6 +285,12 @@ __bpf_kfunc void bpf_testmod_ctx_release(struct bpf_testmod_ctx *ctx)
                call_rcu(&ctx->rcu, testmod_free_cb);
 }
 
+__bpf_kfunc void bpf_testmod_ctx_release_dtor(void *ctx)
+{
+       bpf_testmod_ctx_release(ctx);
+}
+CFI_NOSEAL(bpf_testmod_ctx_release_dtor);
+
 static struct bpf_testmod_ops3 *st_ops3;
 
 static int bpf_testmod_test_3(void)
@@ -707,7 +713,7 @@ BTF_KFUNCS_END(bpf_testmod_common_kfunc_ids)
 
 BTF_ID_LIST(bpf_testmod_dtor_ids)
 BTF_ID(struct, bpf_testmod_ctx)
-BTF_ID(func, bpf_testmod_ctx_release)
+BTF_ID(func, bpf_testmod_ctx_release_dtor)
 
 static const struct btf_kfunc_id_set bpf_testmod_common_kfunc_set = {
        .owner = THIS_MODULE,