[PATCH] parisc: Replace strlcpy() with strscpy()

[PATCH] parisc: Replace strlcpy() with strscpy()

[Kees Cook]

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

Re: [PATCH] parisc: Replace strlcpy() with strscpy()

[Helge Deller]

On 11/16/23 20:13, Kees Cook wrote:
> 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>

applied.

Thanks!
Helge

> ---
>   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;