From 3b47a1ef78a082974f612fd53c94d6b6fdd1be18 Mon Sep 17 00:00:00 2001
From: seonghobae <8172694+seonghobae@users.noreply.github.com>
Date: Sun, 19 Jul 2026 19:03:18 +0000
Subject: [PATCH] =?UTF-8?q?=F0=9F=9B=A1=EF=B8=8F=20Sentinel:=20[CRITICAL]?=
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R/aFIPC.R 파일 내의 `readline()` 입력을 검증하는 정규 표현식(`^[0-9]+$`)을 의도된 입력 값인 '1' 또는 '2'만 정확히 일치시키는 `^[12]$`로 수정하여, 비정상적으로 큰 숫자 문자열이 입력되었을 때 발생하는 정수 오버플로 및 `as.integer()` 변환 후 `NA` 반환으로 인한 다운스트림 로직 오류 및 프로세스 충돌 취약점을 방지했습니다.
---
 .jules/sentinel.md | 4 ++++
 R/aFIPC.R          | 6 +++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/.jules/sentinel.md b/.jules/sentinel.md
index a8207a4..3255af5 100644
--- a/.jules/sentinel.md
+++ b/.jules/sentinel.md
@@ -2,3 +2,7 @@
 **Vulnerability:** Unvalidated inputs passed to `if()` statements can cause process crashes (`condition has length > 1`) or unexpected coercion vulnerabilities.
 **Learning:** In R, optional boolean parameters that default to `NULL` should be validated using explicit runtime type validation (e.g., `if (!is.null(flag) && (!is.logical(flag) || length(flag) != 1 || is.na(flag)))`).
 **Prevention:** Always implement explicit runtime type validation for optional boolean parameters.
+## 2024-05-24 - [CRITICAL] Prevent Integer Overflow Coercion in Interactive Prompts
+**Vulnerability:** Interactive `readline()` prompt validations were using unbounded digit classes (`^[0-9]+$`) to match single-digit numeric inputs (e.g., "1" or "2").
+**Learning:** This approach enables integer overflow coercion vulnerabilities. When an excessively large numeric string is passed, it matches the regex but evaluates to `NA` when coerced via `as.integer()`. This allows unexpected values to bypass the validation and can cause subsequent process crashes (Denial of Service) when passed to downstream logic expecting a valid integer.
+**Prevention:** Strictly match against the exact expected values (e.g., `^[12]$`) rather than unbounded digit classes when validating interactive `readline()` numeric inputs.
diff --git a/R/aFIPC.R b/R/aFIPC.R
index 6254651..918e19b 100644
--- a/R/aFIPC.R
+++ b/R/aFIPC.R
@@ -141,7 +141,7 @@ autoFIPC <-
       }
       for (attempt in seq_len(3)) {
         n <- readline(prompt = "Is it correct? (1: Yes 2: No) : ")
-        if (grepl("^[0-9]+$", n)) {
+        if (grepl("^[12]$", n)) {
           return(as.integer(n))
         }
       }
@@ -171,7 +171,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for oldform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }
@@ -390,7 +390,7 @@ autoFIPC <-
               readline(
                 prompt = "Do you want to use default BILOG-MG priors for newform Data? (1: Yes 2: No) : "
               )
-            if (grepl("^[0-9]+$", n)) {
+            if (grepl("^[12]$", n)) {
               return(as.integer(n))
             }
           }