linux-kernel - Re: [PATCH] EISA: Increase length of device names

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Message-ID: <y5hkfx6tld2khsv2rb7w3k5hlkhfjfn7ndwwj5g75hkdebvjat@mypbmvg5brfi>
Date: Sat, 15 Mar 2025 17:02:26 +0100
From: Alejandro Colomar <alx@...nel.org>
To: Alex Elder <elder@...cstar.com>, Kees Cook <kees@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Azeem Shaikh <azeemshaikh38@...il.com>, Alex Elder <elder@...nel.org>, 
	Sumit Garg <sumit.garg@...nel.org>, linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] EISA: Increase length of device names

Hi Kees, Alex,

On Sat, Mar 15, 2025 at 09:27:36AM -0500, Alex Elder wrote:
> On 3/10/25 5:24 PM, Kees Cook wrote:
> > GCC 15's -Wunterminated-string-initialization warned about truncated
> > name strings. Instead of marking them with the "nonstring" attribute[1],
> > increase their length to correctly include enough space for the
> > terminating NUL character, as they are used with %s format specifiers.

It might be interesting to mention where they are used with %s.

> > Link: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117178 [1]
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Azeem Shaikh <azeemshaikh38@...il.com>
> > Cc: Alex Elder <elder@...nel.org>
> 
> This was interesting, but based on the bug text I suspect you
> meant to address this to Alejandro Colomar, <alx@...nel.org>.

Thanks!

> For what it's worth, it looks fine to me.

LGTM too.  Assuming that changing the size of the arrays doesn't break
something else, it looks good.


Have a lovely day!
Alex

> 					-Alex
> 
> > Cc: Sumit Garg <sumit.garg@...nel.org>
> > Signed-off-by: Kees Cook <kees@...nel.org>
> > ---
> >   drivers/eisa/eisa-bus.c | 2 +-
> >   include/linux/eisa.h    | 4 +++-
> >   2 files changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/eisa/eisa-bus.c b/drivers/eisa/eisa-bus.c
> > index cb586a362944..edceea083b98 100644
> > --- a/drivers/eisa/eisa-bus.c
> > +++ b/drivers/eisa/eisa-bus.c
> > @@ -21,7 +21,7 @@
> >   struct eisa_device_info {
> >   	struct eisa_device_id id;
> > -	char name[50];
> > +	char name[EISA_DEVICE_INFO_NAME_SIZE];
> >   };
> >   #ifdef CONFIG_EISA_NAMES
> > diff --git a/include/linux/eisa.h b/include/linux/eisa.h
> > index f98200cae637..c73a410bf88f 100644
> > --- a/include/linux/eisa.h
> > +++ b/include/linux/eisa.h
> > @@ -28,6 +28,8 @@
> >   #define EISA_CONFIG_ENABLED         1
> >   #define EISA_CONFIG_FORCED          2
> > +#define EISA_DEVICE_INFO_NAME_SIZE	51
> > +
> >   /* There is not much we can say about an EISA device, apart from
> >    * signature, slot number, and base address. dma_mask is set by
> >    * default to parent device mask..*/
> > @@ -41,7 +43,7 @@ struct eisa_device {
> >   	u64                   dma_mask;
> >   	struct device         dev; /* generic device */
> >   #ifdef CONFIG_EISA_NAMES
> > -	char		      pretty_name[50];
> > +	char		      pretty_name[EISA_DEVICE_INFO_NAME_SIZE];
> >   #endif
> >   };
> 

-- 
<https://www.alejandro-colomar.es/>

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