linux-kernel - [PATCH] of/flattree: Replace all non-returning strlcpy with strscpy

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Message-ID: <20230530162202.983558-1-azeemshaikh38@gmail.com>
Date:   Tue, 30 May 2023 16:22:02 +0000
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Michal Simek <monstr@...str.eu>
Cc:     linux-hardening@...r.kernel.org,
        Azeem Shaikh <azeemshaikh38@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] of/flattree: 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>
---
 arch/microblaze/kernel/prom.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index c5c6186a7e8b..e424c796e297 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -20,7 +20,7 @@ void __init early_init_devtree(void *params)
 
 	early_init_dt_scan(params);
 	if (!strlen(boot_command_line))
-		strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
+		strscpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
 
 	memblock_allow_resize();