tracing: Replace strlcpy with strscpy in trace/events/task.h

strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().

No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Link: https://lore.kernel.org/linux-trace-kernel/20230831194212.1529941-1-azeemshaikh38@gmail.com
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/include/trace/events/task.h b/include/trace/events/task.h
index 64d1609..47b5274 100644 (file)
--- a/include/trace/events/task.h
+++ b/include/trace/events/task.h
@@ -47,7 +47,7 @@ TRACE_EVENT(task_rename,
        TP_fast_assign(
                __entry->pid = task->pid;
                memcpy(entry->oldcomm, task->comm, TASK_COMM_LEN);
-               strlcpy(entry->newcomm, comm, TASK_COMM_LEN);
+               strscpy(entry->newcomm, comm, TASK_COMM_LEN);
                __entry->oom_score_adj = task->signal->oom_score_adj;
        ),