multiple_choice
medium
Remember
octal-special
2 points
Question 18. CSCD240-E1-C
chmod 4755 /opt/app/runner — which bit was set?
Work the drill
Answer on paper or in a terminal before revealing the ideal answer.
Ideal answer
B: setuid
Misconception bank
Each row below is a plausible wrong answer, the thinking that produces it, and the remedy that corrects the misconception. These are the foundation of the multiple-choice framing and the targeted feedback a student receives after answering.
A: setgid
Misconception. setgid is 2xxx, not 4xxx.
Remedy. 4-2-1: 4=setuid, 2=setgid, 1=sticky.
C: sticky
Misconception. Sticky is 1xxx.
Remedy. 4-2-1 mnemonic.
D: none, only 755 applied
Misconception. The leading 4 IS the setuid bit.
Remedy. Read 4-digit mode carefully.
Authority mappings
Hover any chip for the mapping justification; click to open the authority record.
DCWF roles:
CE-121 Exploitation Analyst
DCWF tasks:
T0250
KU outcomes:
CO-M10-O1
NCAE errors:
SMB Read / failure: SMB operation failed: [Errno .SMB Read / partial: SMB operation failed: Failed .SMB Read / failure: SMB operation failed: [Errno .
Course-artifact links
Lectures
- CSCD240-S26-L06. Permissions part 2: chmod octal + symbolic, directory x bit