linux-kernel - [for-linus][PATCH 04/11] tracing: Replace strlcpy with strscpy in trace/events/task.h

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Message-ID: <20230902115118.838838036@goodmis.org>
Date:   Sat, 02 Sep 2023 07:50:39 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Azeem Shaikh <azeemshaikh38@...il.com>
Subject: [for-linus][PATCH 04/11] tracing: Replace strlcpy with strscpy in trace/events/task.h

From: Azeem Shaikh <azeemshaikh38@...il.com>

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@...nel.org>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 include/trace/events/task.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/trace/events/task.h b/include/trace/events/task.h
index 64d160930b0d..47b527464d1a 100644
--- 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;
 	),
 
-- 
2.40.1