CyberRota Analysis
AI-GeneratedThe vulnerability affects the Linux kernel's ftrace functionality, specifically the trace_parser structure, which can lead to concurrent access issues when multiple threads interact with trace files. This can result in corrupted input or undefined behavior due to race conditions on the parser's internal state. System administrators and developers utilizing ftrace in multi-threaded environments should prioritize applying the fix to ensure stability and prevent potential data corruption.
Original NVD Description
In the Linux kernel, the following vulnerability has been resolved: ftrace: Add global mutex to serialize trace_parser access In ftrace, the trace_parser structure is allocated and initialized when a trace file is opened, and is subsequently used across write and release handlers to parse user input. The affected handler paths and their specific functions are: - Open paths: ftrace_regex_open(), ftrace_graph_open() - Write paths: ftrace_regex_write(), ftrace_graph_write() - Release paths: ftrace_regex_release(), ftrace_graph_release() If userspace opens a trace file descriptor and shares it across multiple threads, concurrent write calls will race on the parser's internal state, specifically the 'idx', 'cont', and 'buffer' fields, leading to corrupted input or undefined behavior. Fix this by adding a global mutex, parser_lock, to serialize all access to trace_parser across write and release paths, preventing concurrent corruption of parser state.