🛡️ Sentinel: [HIGH] 대화형 프롬프트의 정수 오버플로우 DoS 취약점 수정

[seonghobae]

R/aFIPC.R 파일 내의 readline()을 사용하는 대화형 프롬프트에서 발생할 수 있는 정수 오버플로우 DoS(Denial of Service) 취약점을 수정했습니다. 기존 코드는 grepl("^[0-9]+$", n) 정규표현식을 사용하여 숫자인지만을 검증했기 때문에, 매우 큰 문자열이 입력되면 as.integer() 변환 시 오버플로우가 발생하여 NA가 반환되고 응용 프로그램이 크래시될 수 있는 문제가 있었습니다. 이를 해결하기 위해 입력값이 정확히 "1" 또는 "2"인지 검사하는 n %in% c("1", "2") 조건으로 변경했습니다.

• R/aFIPC.R: 3곳의 readline() 입력 검증 로직 수정
• .jules/sentinel.md: 학습 저널에 취약점 및 예방 방법 기록

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PR created automatically by Jules for task 11529466761600351433 started by @seonghobae

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