linux-kernel - [PATCH] mm/kasan: switch from strlcpy to strscpy

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Message-Id: <1613970647-23272-1-git-send-email-daizhiyuan@phytium.com.cn>
Date:   Mon, 22 Feb 2021 13:10:47 +0800
From:   Zhiyuan Dai <daizhiyuan@...tium.com.cn>
To:     ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
        dvyukov@...gle.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Zhiyuan Dai <daizhiyuan@...tium.com.cn>
Subject: [PATCH] mm/kasan: switch from strlcpy to strscpy

strlcpy is marked as deprecated in Documentation/process/deprecated.rst,
and there is no functional difference when the caller expects truncation
(when not checking the return value). strscpy is relatively better as it
also avoids scanning the whole source string.

Signed-off-by: Zhiyuan Dai <daizhiyuan@...tium.com.cn>
---
 mm/kasan/report_generic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/report_generic.c b/mm/kasan/report_generic.c
index 8a9c889..fc7f7ad 100644
--- a/mm/kasan/report_generic.c
+++ b/mm/kasan/report_generic.c
@@ -148,7 +148,7 @@ static bool __must_check tokenize_frame_descr(const char **frame_descr,
 		}
 
 		/* Copy token (+ 1 byte for '\0'). */
-		strlcpy(token, *frame_descr, tok_len + 1);
+		strscpy(token, *frame_descr, tok_len + 1);
 	}
 
 	/* Advance frame_descr past separator. */
-- 
1.8.3.1