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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id 13-20020a17090a030d00b0026971450601sm287996pje.7.2023.10.03.18.44.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Oct 2023 18:44:52 -0700 (PDT) From: Kees Cook To: David Ahern Cc: Kees Cook , "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] nexthop: Annotate struct nh_group with __counted_by Date: Tue, 3 Oct 2023 18:44:49 -0700 Message-Id: <20231004014445.work.587-kees@kernel.org> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1227; i=keescook@chromium.org; h=from:subject:message-id; bh=cMswho+iyVCS84W5fjbN8jRy801YZPgydXwTL+hQ8kc=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlHMOR/Qnr9xsjz+RFrB//RUqkmhmuWuLMRFIHY H/zRm5APC2JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZRzDkQAKCRCJcvTf3G3A JuubD/4pBLzIK8LRipBfuGiuOfRseLiRbFNh1J5EeR0aFUlyz21VWo/ONGuXtGXOxgktDliVWxQ pv0tg3RLvxJNCOGY0pFJOG7j7tgN8w7Tn1Eomvh7IHQ5UyysY1/txn95G/iwzma9N0e7cspWjOk i71eVTwBrYMFx/XI4JIGT/Y9Zt1Z7uXKyqTlkZXE6kTi3ZsMUE37k9g0yX58iiGmmdLols1ocL0 rqjyPdN/KncryQkGHLsjMD3SXftQJUoKrZK61q7t0of7ZLGX8o4I0yTevYIk1imAMduLhWTqEYR n5BRvPG5JvAE5d8L3VsggU36WF5pidU5c5RPVzoOeztl69WWEB9ecpndC9ok0Z2xCh48x36HD/G G8235S8ONP14DbGP/eVc/1yqdWpS4vrLruFiJ1HySU5pHPtGQ2rcuJbbPDQx35xXPl6D7okwBw5 6MMdORrwX7unzOIOhGIWeKBICZes22QAxOctpG8/+dcQkEIty1JY7KSivhZUA1pxzAp73DIoOtr hNj60Fetls5Hcp93vQjT0Ls91cpLL/i80y2sZmrX6m/CIEexZMYuGUrLdBMlDJrEb/v487rDH+P CEGyWn17nSifdO3/K+Cm1GoILthQET2DXe6j2wjQk5tbiB+Rs+XVL9eXb9mtQUGsB5NdyB+aJU3 MmGRBkZ wCCDJXzA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net X-Patchwork-Delegate: kuba@kernel.org 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 Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni 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 Reviewed-by: David Ahern --- include/net/nexthop.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/nexthop.h b/include/net/nexthop.h index 8f5a2ab45920..d92046a4a078 100644 --- a/include/net/nexthop.h +++ b/include/net/nexthop.h @@ -126,7 +126,7 @@ struct nh_group { bool has_v4; struct nh_res_table __rcu *res_table; - struct nh_grp_entry nh_entries[]; + struct nh_grp_entry nh_entries[] __counted_by(num_nh); }; struct nexthop {