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From:   Kees Cook <keescook@chromium.org>
To:     "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc:     Kees Cook <keescook@chromium.org>, Helge Deller <deller@gmx.de>,
        Azeem Shaikh <azeemshaikh38@gmail.com>,
        linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-hardening@vger.kernel.org
Subject: [PATCH] parisc: Replace strlcpy() with strscpy()
Date:   Thu, 16 Nov 2023 11:13:40 -0800
Message-Id: <20231116191336.work.986-kees@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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].
Additionally, it returns the size of the source string, not the
resulting size of the destination string. In an effort to remove strlcpy()
completely[2], replace strlcpy() here with strscpy().

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy [1]
Link: https://github.com/KSPP/linux/issues/89 [2]
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: linux-parisc@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 arch/parisc/kernel/processor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/kernel/processor.c b/arch/parisc/kernel/processor.c
index 29e2750f86a4..e95a977ba5f3 100644
--- a/arch/parisc/kernel/processor.c
+++ b/arch/parisc/kernel/processor.c
@@ -383,7 +383,7 @@ show_cpuinfo (struct seq_file *m, void *v)
 	char cpu_name[60], *p;
 
 	/* strip PA path from CPU name to not confuse lscpu */
-	strlcpy(cpu_name, per_cpu(cpu_data, 0).dev->name, sizeof(cpu_name));
+	strscpy(cpu_name, per_cpu(cpu_data, 0).dev->name, sizeof(cpu_name));
 	p = strrchr(cpu_name, '[');
 	if (p)
 		*(--p) = 0;
-- 
2.34.1