[PATCH] trace/events/task.h: Replace strlcpy with strscpy

From: Azeem Shaikh
Date: Thu Aug 31 2023 - 15:42:29 EST


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

Signed-off-by: Azeem Shaikh <azeemshaikh38@xxxxxxxxx>
---
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;
),

--
2.42.0.283.g2d96d420d3-goog