From 4a186c58348fc71057232902fb63d8f374114950 Mon Sep 17 00:00:00 2001
From: Trent Nelson <trent@solana.com>
Date: Mon, 13 Dec 2021 08:48:38 -0700
Subject: [PATCH] Revert "Adds a feature gate to reject the deployment of
 programs with unresolved syscall symbols. (#21298)"

This reverts commit 06a3e9b1786cbf6da95e4825022f92f661c4e9c4.
---
 programs/bpf_loader/src/lib.rs | 15 +++++----------
 sdk/src/feature_set.rs         |  5 -----
 2 files changed, 5 insertions(+), 15 deletions(-)

diff --git a/programs/bpf_loader/src/lib.rs b/programs/bpf_loader/src/lib.rs
index 7c43147023..73547d922b 100644
--- a/programs/bpf_loader/src/lib.rs
+++ b/programs/bpf_loader/src/lib.rs
@@ -33,8 +33,7 @@ use {
         entrypoint::{HEAP_LENGTH, SUCCESS},
         feature_set::{
             add_missing_program_error_mappings, close_upgradeable_program_accounts,
-            fix_write_privs, reduce_required_deploy_balance,
-            reject_deployment_of_unresolved_syscalls, requestable_heap_size,
+            fix_write_privs, reduce_required_deploy_balance, requestable_heap_size,
             stop_verify_mul64_imm_nonzero, upgradeable_close_instruction,
         },
         ic_logger_msg, ic_msg,
@@ -79,7 +78,6 @@ pub fn create_executor(
     program_data_offset: usize,
     invoke_context: &mut dyn InvokeContext,
     use_jit: bool,
-    reject_unresolved_syscalls: bool,
 ) -> Result<Arc<BpfExecutor>, InstructionError> {
     let syscall_registry = syscalls::register_syscalls(invoke_context).map_err(|e| {
         ic_msg!(invoke_context, "Failed to register syscalls: {}", e);
@@ -90,8 +88,6 @@ pub fn create_executor(
         max_call_depth: bpf_compute_budget.max_call_depth,
         stack_frame_size: bpf_compute_budget.stack_frame_size,
         enable_instruction_tracing: log_enabled!(Trace),
-        reject_unresolved_syscalls: reject_unresolved_syscalls
-            && invoke_context.is_feature_active(&reject_deployment_of_unresolved_syscalls::id()),
         verify_mul64_imm_nonzero: !invoke_context
             .is_feature_active(&stop_verify_mul64_imm_nonzero::id()), // TODO: Feature gate and then remove me
         ..Config::default()
@@ -242,8 +238,7 @@ fn process_instruction_common(
         let executor = match invoke_context.get_executor(program_id) {
             Some(executor) => executor,
             None => {
-                let executor =
-                    create_executor(0, program_data_offset, invoke_context, use_jit, false)?;
+                let executor = create_executor(0, program_data_offset, invoke_context, use_jit)?;
                 invoke_context.add_executor(program_id, executor.clone());
                 executor
             }
@@ -437,7 +432,7 @@ fn process_loader_upgradeable_instruction(
             )?;
 
             // Load and verify the program bits
-            let executor = create_executor(3, buffer_data_offset, invoke_context, use_jit, true)?;
+            let executor = create_executor(3, buffer_data_offset, invoke_context, use_jit)?;
             invoke_context.add_executor(&new_program_id, executor);
 
             let keyed_accounts = invoke_context.get_keyed_accounts()?;
@@ -569,7 +564,7 @@ fn process_loader_upgradeable_instruction(
             }
 
             // Load and verify the program bits
-            let executor = create_executor(2, buffer_data_offset, invoke_context, use_jit, true)?;
+            let executor = create_executor(2, buffer_data_offset, invoke_context, use_jit)?;
             invoke_context.add_executor(&new_program_id, executor);
 
             let keyed_accounts = invoke_context.get_keyed_accounts()?;
@@ -838,7 +833,7 @@ fn process_loader_instruction(
                 return Err(InstructionError::MissingRequiredSignature);
             }
 
-            let executor = create_executor(0, 0, invoke_context, use_jit, true)?;
+            let executor = create_executor(0, 0, invoke_context, use_jit)?;
             let keyed_accounts = invoke_context.get_keyed_accounts()?;
             let program = keyed_account_at_index(keyed_accounts, 0)?;
             invoke_context.add_executor(program.unsigned_key(), executor);
diff --git a/sdk/src/feature_set.rs b/sdk/src/feature_set.rs
index 4d50d42717..fe6d843a76 100644
--- a/sdk/src/feature_set.rs
+++ b/sdk/src/feature_set.rs
@@ -261,10 +261,6 @@ pub mod spl_token_v3_3_0_release {
     solana_sdk::declare_id!("Ftok2jhqAqxUWEiCVRrfRs9DPppWP8cgTB7NQNKL88mS");
 }
 
-pub mod reject_deployment_of_unresolved_syscalls {
-    solana_sdk::declare_id!("DqniU3MfvdpU3yhmNF1RKeaM5TZQELZuyFGosASRVUoy");
-}
-
 lazy_static! {
     /// Map of feature identifiers to user-visible description
     pub static ref FEATURE_NAMES: HashMap<Pubkey, &'static str> = [
@@ -330,7 +326,6 @@ lazy_static! {
         (requestable_heap_size::id(), "Requestable heap frame size"),
         (add_compute_budget_program::id(), "Add compute_budget_program"),
         (spl_token_v3_3_0_release::id(), "spl-token v3.3.0 release"),
-        (reject_deployment_of_unresolved_syscalls::id(), "Reject deployment of programs with unresolved syscall symbols"),
         /*************** ADD NEW FEATURES HERE ***************/
     ]
     .iter()