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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id jc1-20020a17090325c100b001b8a3e2c241sm10147160plb.14.2023.09.29.11.07.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 11:07:49 -0700 (PDT) From: Kees Cook To: Ido Schimmel Cc: Kees Cook , Petr Machata , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, "Gustavo A. R. Silva" , Nathan Chancellor , Nick Desaulniers , Tom Rix , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH 5/5] mlxsw: spectrum_span: Annotate struct mlxsw_sp_span with __counted_by Date: Fri, 29 Sep 2023 11:07:44 -0700 Message-Id: <20230929180746.3005922-5-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230929180611.work.870-kees@kernel.org> References: <20230929180611.work.870-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1497; i=keescook@chromium.org; h=from:subject; bh=jOjkutl+FN0Q0NcydftzDs97qCbfIf1phadYTLsXBco=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlFxJwlBbholfX/29SJCBAGZf8A8xz38gXp6NGn iJOOuDg+hWJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZRcScAAKCRCJcvTf3G3A Jl1kD/90JOuRmIMhCW3kVJu4Gf7kOSWnfxMGxbUxzN86sjU+wC/P4QEzsQgpQHekYaH3EkKx7w3 hZY3FZcnwP5TRImzUsKk3CTw9Mh+q5lC+9myfP1SslNwswdLHQFuNlACOS3ib7oQcKfwl/L+0+C 4nNsIZCoUyPTYoHcC5bpZ2/WYHFFyzk1INSN5bwLVHjUtbYzN8WfOnbhXAh2UCBZx6M241VRFt8 GdGwT6UEKT/WxeFImZc1/we2T3lPaFgJL6cTsFwBsC7VzwsJjSGrozdK64zfdYXL8GR0hu6IFON q1m8C/5hOkI5Roxt+ixnIcsJCMEtG/toG1nRVfNmwbrvS47XKtz/9suOKadveDxhgjmE8ly8vb9 7I8Y68+f9/E2SZs1lLgKDlALZRHfjrUcCQKkaSOdncpJ79tVuDV1WHvLwlkOXKcS5PZp79wPxwU C1nBv+Fb8S9rOV2GUWx4CwY6gPSJITjbsK8OwtN2gpaZ4HEwqJNynjJKdJ3pnlxS8L5G7JQQ0Z0 sL2oqyF2kseDrtIcEFZjha2dZXLaLgCwgW5bGfqsUbO/7bxD82ySZTA7UMqKtDu7ukVDDnrHoPM 34KCVIJKR5OuqECReYCfRgG35+fh2+3yxWpNQu+qbdDtXvkRWrF76jUvTEoG0cSZ9AhOMB2wrUZ ptq+XEqPzyVUZaQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 mlxsw_sp_span. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/cou= nted_by.cocci Cc: Ido Schimmel Cc: Petr Machata Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook Reviewed-by: Ido Schimmel Reviewed-by: Justin Stitt --- drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c b/drivers/= net/ethernet/mellanox/mlxsw/spectrum_span.c index b3472fb94617..af50ff9e5f26 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_span.c @@ -31,7 +31,7 @@ struct mlxsw_sp_span { refcount_t policer_id_base_ref_count; atomic_t active_entries_count; int entries_count; - struct mlxsw_sp_span_entry entries[]; + struct mlxsw_sp_span_entry entries[] __counted_by(entries_count); }; =20 struct mlxsw_sp_span_analyzed_port { --=20 2.34.1