linux-hardening - [PATCH] clocksource: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230530163546.986188-1-azeemshaikh38@gmail.com>
Date:   Tue, 30 May 2023 16:35:46 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] clocksource: 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>
---
 kernel/time/clocksource.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 91836b727cef..88cbc1181b23 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -1480,7 +1480,7 @@ static int __init boot_override_clocksource(char* str)
 {
 	mutex_lock(&clocksource_mutex);
 	if (str)
-		strlcpy(override_name, str, sizeof(override_name));
+		strscpy(override_name, str, sizeof(override_name));
 	mutex_unlock(&clocksource_mutex);
 	return 1;
 }