linux-kernel - [PATCH] EISA: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230706175804.2249018-1-azeemshaikh38@gmail.com>
Date:   Thu,  6 Jul 2023 17:58:04 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] EISA: Replace all non-returning strlcpy with strscpy

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@...il.com>
---
 drivers/eisa/eisa-bus.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/eisa/eisa-bus.c b/drivers/eisa/eisa-bus.c
index 713582cc27d1..33f0ba11c6ad 100644
--- a/drivers/eisa/eisa-bus.c
+++ b/drivers/eisa/eisa-bus.c
@@ -60,7 +60,7 @@ static void __init eisa_name_device(struct eisa_device *edev)
 	int i;
 	for (i = 0; i < EISA_INFOS; i++) {
 		if (!strcmp(edev->id.sig, eisa_table[i].id.sig)) {
-			strlcpy(edev->pretty_name,
+			strscpy(edev->pretty_name,
 				eisa_table[i].name,
 				sizeof(edev->pretty_name));
 			return;
-- 
2.41.0.255.g8b1d071c50-goog