🛡️ Sentinel: [MEDIUM] 입력값 검증의 정규식 수정을 통한 정수 오버플로우 취약점 방지

.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.
+## 2024-05-18 - [CRITICAL] Prevent Integer Overflow Coercion in readline Input Validation
+**Vulnerability:** Interactive `readline()` prompts for binary choices (e.g., '1' or '2') in `autoFIPC` incorrectly validated input using the unbounded regular expression `^[0-9]+$`. This allows arbitrarily large numeric strings (e.g., "999999999999999999999") to pass the regex check, which subsequently evaluates to `NA` when coerced via `as.integer()`, potentially causing unhandled exceptions or process crashes.
+**Learning:** The previous validation implementation used `^[0-9]+$` allowing unbounded numeric digits, assuming `as.integer()` would handle it securely. However, R's `as.integer()` returns `NA` with a warning for out-of-range large integers, which leaks into subsequent logic that expects an integer.
+**Prevention:** Strictly limit allowed character patterns matching exact expected literal values (e.g., `^[12]$`) instead of generic type structures (e.g., all digits) when validating string inputs bound for type coercion or conditionals.

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))
             }
           }