1 files changed, 0 insertions, 56 deletions

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 7af0dcc5d755..48c914b983bd 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -586,59 +586,6 @@ void bpf_register_prog_type(struct bpf_prog_type_list *tl)
         list_add(&tl->list_node, &bpf_prog_types);
 }
 
-/* fixup insn->imm field of bpf_call instructions:
- * if (insn->imm == BPF_FUNC_map_lookup_elem)
- *      insn->imm = bpf_map_lookup_elem - __bpf_call_base;
- * else if (insn->imm == BPF_FUNC_map_update_elem)
- *      insn->imm = bpf_map_update_elem - __bpf_call_base;
- * else ...
- *
- * this function is called after eBPF program passed verification
- */
-static void fixup_bpf_calls(struct bpf_prog *prog)
-{
-        const struct bpf_func_proto *fn;
-        int i;
-
-        for (i = 0; i < prog->len; i++) {
-                struct bpf_insn *insn = &prog->insnsi[i];
-
-                if (insn->code == (BPF_JMP | BPF_CALL)) {
-                        /* we reach here when program has bpf_call instructions
-                         * and it passed bpf_check(), means that
-                         * ops->get_func_proto must have been supplied, check it
-                         */
-                        BUG_ON(!prog->aux->ops->get_func_proto);
-
-                        if (insn->imm == BPF_FUNC_get_route_realm)
-                                prog->dst_needed = 1;
-                        if (insn->imm == BPF_FUNC_get_prandom_u32)
-                                bpf_user_rnd_init_once();
-                        if (insn->imm == BPF_FUNC_xdp_adjust_head)
-                                prog->xdp_adjust_head = 1;
-                        if (insn->imm == BPF_FUNC_tail_call) {
-                                /* mark bpf_tail_call as different opcode
-                                 * to avoid conditional branch in
-                                 * interpeter for every normal call
-                                 * and to prevent accidental JITing by
-                                 * JIT compiler that doesn't support
-                                 * bpf_tail_call yet
-                                 */
-                                insn->imm = 0;
-                                insn->code |= BPF_X;
-                                continue;
-                        }
-
-                        fn = prog->aux->ops->get_func_proto(insn->imm);
-                        /* all functions that have prototype and verifier allowed
-                         * programs to call them, must be real in-kernel functions
-                         */
-                        BUG_ON(!fn->func);
-                        insn->imm = fn->func - __bpf_call_base;
-                }
-        }
-}
-
 /* drop refcnt on maps used by eBPF program and free auxilary data */
 static void free_used_maps(struct bpf_prog_aux *aux)
 {
@@ -892,9 +839,6 @@ static int bpf_prog_load(union bpf_attr *attr)
         if (err < 0)
                 goto free_used_maps;
 
-        /* fixup BPF_CALL->imm field */
-        fixup_bpf_calls(prog);
-
         /* eBPF program is ready to be JITed */
         prog = bpf_prog_select_runtime(prog, &err);
         if (err < 0)