Httpsfiledottofolder Exclusive File
# Step 2: Acquire exclusive advisory lock on temp file fcntl.flock(fd, fcntl.LOCK_EX)
| Risk | Consequence | |------|-------------| | Race condition | Two processes write same file → corruption | | Partial read | Another process reads file before write complete | | Overwrite | Accidental destruction of previous data | | Permission bypass | Unauthorized access during the window of vulnerability | httpsfiledottofolder exclusive
@app.route('/exclusive-upload/<filename>', methods=['PUT']) def exclusive_upload(filename): # Security: ensure no path traversal safe_filename = os.path.basename(filename) final_path = os.path.join(TARGET_BASE, safe_filename) temp_path = final_path + ".tmp_exclusive" # Step 2: Acquire exclusive advisory lock on temp file fcntl
