1 files changed, 27 insertions, 5 deletions

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index d11cbf8cece7..f7dd8af06413 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -19,6 +19,7 @@
 #include <linux/bpf_verifier.h>
 #include <linux/btf.h>
 #include <linux/btf_ids.h>
+#include <linux/bpf_lsm.h>
 #include <linux/skmsg.h>
 #include <linux/perf_event.h>
 #include <linux/bsearch.h>
@@ -205,6 +206,7 @@ enum btf_kfunc_hook {
 	BTF_KFUNC_HOOK_STRUCT_OPS,
 	BTF_KFUNC_HOOK_TRACING,
 	BTF_KFUNC_HOOK_SYSCALL,
+	BTF_KFUNC_HOOK_FMODRET,
 	BTF_KFUNC_HOOK_MAX,
 };
 
@@ -5829,6 +5831,7 @@ static bool prog_args_trusted(const struct bpf_prog *prog)
 	case BPF_PROG_TYPE_TRACING:
 		return atype == BPF_TRACE_RAW_TP || atype == BPF_TRACE_ITER;
 	case BPF_PROG_TYPE_LSM:
+		return bpf_lsm_is_trusted(prog);
 	case BPF_PROG_TYPE_STRUCT_OPS:
 		return true;
 	default:
@@ -7606,11 +7609,14 @@ u32 *btf_kfunc_id_set_contains(const struct btf *btf,
 	return __btf_kfunc_id_set_contains(btf, hook, kfunc_btf_id);
 }
 
-/* This function must be invoked only from initcalls/module init functions */
-int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
-			      const struct btf_kfunc_id_set *kset)
+u32 *btf_kfunc_is_modify_return(const struct btf *btf, u32 kfunc_btf_id)
+{
+	return __btf_kfunc_id_set_contains(btf, BTF_KFUNC_HOOK_FMODRET, kfunc_btf_id);
+}
+
+static int __register_btf_kfunc_id_set(enum btf_kfunc_hook hook,
+				       const struct btf_kfunc_id_set *kset)
 {
-	enum btf_kfunc_hook hook;
 	struct btf *btf;
 	int ret;
 
@@ -7629,13 +7635,29 @@ int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
 	if (IS_ERR(btf))
 		return PTR_ERR(btf);
 
-	hook = bpf_prog_type_to_kfunc_hook(prog_type);
 	ret = btf_populate_kfunc_set(btf, hook, kset->set);
 	btf_put(btf);
 	return ret;
 }
+
+/* This function must be invoked only from initcalls/module init functions */
+int register_btf_kfunc_id_set(enum bpf_prog_type prog_type,
+			      const struct btf_kfunc_id_set *kset)
+{
+	enum btf_kfunc_hook hook;
+
+	hook = bpf_prog_type_to_kfunc_hook(prog_type);
+	return __register_btf_kfunc_id_set(hook, kset);
+}
 EXPORT_SYMBOL_GPL(register_btf_kfunc_id_set);
 
+/* This function must be invoked only from initcalls/module init functions */
+int register_btf_fmodret_id_set(const struct btf_kfunc_id_set *kset)
+{
+	return __register_btf_kfunc_id_set(BTF_KFUNC_HOOK_FMODRET, kset);
+}
+EXPORT_SYMBOL_GPL(register_btf_fmodret_id_set);
+
 s32 btf_find_dtor_kfunc(struct btf *btf, u32 btf_id)
 {
 	struct btf_id_dtor_kfunc_tab *tab = btf->dtor_kfunc_tab;