linux-kernel - [PATCH] nfp: nsp: Annotate struct nfp_eth_table with __counted

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Message-Id: <20231003231850.work.335-kees@kernel.org>
Date:   Tue,  3 Oct 2023 16:18:51 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Simon Horman <horms@...nel.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Simon Horman <simon.horman@...igine.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Yinjun Zhang <yinjun.zhang@...igine.com>,
        Leon Romanovsky <leon@...nel.org>,
        Yu Xiao <yu.xiao@...igine.com>,
        Sixiang Chen <sixiang.chen@...igine.com>,
        oss-drivers@...igine.com, netdev@...r.kernel.org,
        Louis Peens <louis.peens@...igine.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH] nfp: nsp: Annotate struct nfp_eth_table with __counted_by

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 nfp_eth_table.

Cc: Simon Horman <simon.horman@...igine.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: Yinjun Zhang <yinjun.zhang@...igine.com>
Cc: Leon Romanovsky <leon@...nel.org>
Cc: Yu Xiao <yu.xiao@...igine.com>
Cc: Sixiang Chen <sixiang.chen@...igine.com>
Cc: oss-drivers@...igine.com
Cc: netdev@...r.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
index 6e044ac04917..00264af13b49 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.h
@@ -241,7 +241,7 @@ struct nfp_eth_table {
 
 		u64 link_modes_supp[2];
 		u64 link_modes_ad[2];
-	} ports[];
+	} ports[] __counted_by(count);
 };
 
 struct nfp_eth_table *nfp_eth_read_ports(struct nfp_cpp *cpp);
-- 
2.34.1