linux-hardening - Re: [PATCH] watch_queue: Annotate struct watch_filter with __counted

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Sat, 23 Sep 2023 10:38:11 -0600
From: "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To: Kees Cook <keescook@...omium.org>, David Howells <dhowells@...hat.com>
Cc: Randy Dunlap <rdunlap@...radead.org>, Al Viro <viro@...iv.linux.org.uk>,
 Christian Brauner <brauner@...nel.org>, Jonathan Corbet <corbet@....net>,
 Siddh Raman Pant <code@...dh.me>, Mauro Carvalho Chehab
 <mchehab@...nel.org>, Qian Cai <cai@...hat.com>,
 Nathan Chancellor <nathan@...nel.org>,
 Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
 linux-hardening@...r.kernel.org
Subject: Re: [PATCH] watch_queue: Annotate struct watch_filter with
 __counted_by

On 9/22/23 11:54, Kees Cook wrote:
> Prepare for the coming implementation by GCC and Clang of the __counted_by
> attribute. Flexible array members annotated with __counted_by can have
> their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
> (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
> functions).
> 
> As found with Coccinelle[1], add __counted_by for struct watch_filter.
> 
> [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci
> 
> Cc: David Howells <dhowells@...hat.com>
> Cc: Randy Dunlap <rdunlap@...radead.org>
> Cc: Al Viro <viro@...iv.linux.org.uk>
> Cc: Christian Brauner <brauner@...nel.org>
> Cc: Jonathan Corbet <corbet@....net>
> Cc: Siddh Raman Pant <code@...dh.me>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Qian Cai <cai@...hat.com>
> Signed-off-by: Kees Cook <keescook@...omium.org>

Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>

Thanks
-- 
Gustavo

> ---
>   include/linux/watch_queue.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/include/linux/watch_queue.h b/include/linux/watch_queue.h
> index 45cd42f55d49..429c7b6afead 100644
> --- a/include/linux/watch_queue.h
> +++ b/include/linux/watch_queue.h
> @@ -32,7 +32,7 @@ struct watch_filter {
>   		DECLARE_BITMAP(type_filter, WATCH_TYPE__NR);
>   	};
>   	u32			nr_filters;	/* Number of filters */
> -	struct watch_type_filter filters[];
> +	struct watch_type_filter filters[] __counted_by(nr_filters);
>   };
>   
>   struct watch_queue {