fs/vfs: validate chmod and chown callers in inode_chstat()#18914
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Add pseudoFS caller validation for chmod and chown operations using the caller's effective uid. Align behavior with POSIX semantics by allowing owner/root chmod and root-only chown. Signed-off-by: Abhishek Mishra <mishra.abhishek2808@gmail.com>
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Summary
Add caller validation for pseudoFS chmod and chown operations in inode_chstat(). This change validates the caller using the task's effective uid and aligns pseudoFS permission behavior with POSIX-style semantics by allowing owner/root chmod operations while restricting chown to root-only.
Impact
Prevents unprivileged tasks from modifying pseudoFS inode ownership or mode bits for arbitrary files. The change affects only pseudoFS inode attribute updates through inode_chstat() and does not modify mountpoint filesystem behavior.
Testing
Validated using a dedicated permission test application on NuttX sim and compared against equivalent Linux behavior . Tested scenarios include root chmod, owner chmod, non-owner chmod denial, root chown, non-root chown denial, ownership propagation, and verification of -EPERM for denied operations.