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Message-ID: <0b7640c4-e6ea-33f9-9477-78a6ddcb195c@kernel.org>
Date: Tue, 3 Oct 2023 20:41:07 -0600
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Subject: Re: [PATCH] nexthop: Annotate struct nh_group with __counted_by
Content-Language: en-US
To: Kees Cook <keescook@chromium.org>
Cc: "David S. Miller" <davem@davemloft.net>,
 Eric Dumazet <edumazet@google.com>, Jakub Kicinski <kuba@kernel.org>,
 Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
 "Gustavo A. R. Silva" <gustavoars@kernel.org>,
 Nathan Chancellor <nathan@kernel.org>,
 Nick Desaulniers <ndesaulniers@google.com>, Tom Rix <trix@redhat.com>,
 linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
 llvm@lists.linux.dev
References: <20231004014445.work.587-kees@kernel.org>
From: David Ahern <dsahern@kernel.org>
In-Reply-To: <20231004014445.work.587-kees@kernel.org>
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On 10/3/23 7:44 PM, 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 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 nh_group.
> 
> Cc: David Ahern <dsahern@kernel.org>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jakub Kicinski <kuba@kernel.org>
> Cc: Paolo Abeni <pabeni@redhat.com>
> Cc: netdev@vger.kernel.org
> Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
> Signed-off-by: Kees Cook <keescook@chromium.org>
> ---
>  include/net/nexthop.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reviewed-by: David Ahern <dsahern@kernel.org>