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

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Date: Sat, 23 Sep 2023 19:52:39 +0530
From: Siddh Raman Pant <code@...dh.me>
To: "Kees Cook" <keescook@...omium.org>
Cc: "David Howells" <dhowells@...hat.com>,
	"Randy Dunlap" <rdunlap@...radead.org>,
	"Al Viro" <viro@...iv.linux.org.uk>,
	"Christian Brauner" <brauner@...nel.org>,
	"Jonathan Corbet" <corbet@....net>,
	"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" <linux-kernel@...r.kernel.org>,
	"llvm" <llvm@...ts.linux.dev>,
	"linux-hardening" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] watch_queue: Annotate struct watch_filter with
 __counted_by

On Fri, 22 Sep 2023 23:24:08 +0530, 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>

Tested with keyutils testsuite.

Tested-by: Siddh Raman Pant <code@...dh.me>

Thanks,
Siddh

> ---
>  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 {
> -- 
> 2.34.1