CyberCertPrepMobile Security FundamentalsMobile OS ArchitectureEASYFree question
Android assigns a unique Linux UID to each installed app. What direct security benefit does this provide?
- A.The Linux kernel enforces file and process access controls based on UID, so apps cannot read each other's data directory without explicitly sharing via IPC
- B.It allows the app to access other apps' files for debugging
- C.It ensures each app is assigned a dedicated CPU core
- D.It prevents the app from communicating over the network
Why A is correct
Each app's data in /data/data/<package>/ is owned by its unique UID. Standard Linux DAC (Discretionary Access Control) prevents other UIDs from reading those files. Even on a non-rooted device, an arbitrary app cannot open another app's database because the kernel rejects the access at the file system level.
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