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[198.0.35.241]) by smtp.gmail.com with ESMTPSA id u2-20020a17090282c200b001c5fe217fb9sm13142608plz.267.2023.09.29.11.11.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 Sep 2023 11:11:50 -0700 (PDT) From: Kees Cook To: Raju Rangoju 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 1/5] chelsio/l2t: Annotate struct l2t_data with __counted_by Date: Fri, 29 Sep 2023 11:11:45 -0700 Message-Id: <20230929181149.3006432-1-keescook@chromium.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230929181042.work.990-kees@kernel.org> References: <20230929181042.work.990-kees@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2088; i=keescook@chromium.org; h=from:subject; bh=A70ndgAnsB63r0Ibz6C+3NACmZt0aUvaCrb1LtGUWWA=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBlFxNkvS86dHwSxy8ppyZ4ezGlY0dySlfyX5m8D KpLi1xEZTeJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCZRcTZAAKCRCJcvTf3G3A JnXDEACBpLVSApm8BNpQD0pC+7W9QFQ72d157scW1CwY8mp7MuBY9cbc42hxF04FiiP0uxr0uGw XLnttDJr1KtImVLWmFl0uTUJ2xvOvLqJgAcPgUHpRHHu4p6f3W4JigMcvvGsLfUiWnHrd2E70bp EXieKubhNH+KdSuW1X6a5GdsevlmO37r3NEQ/nOm2IYzC0HZTjokvwhXWWKVx7PdVa1cQrq0fDz quZ7/aSDzhr6+fC04zQC3bu3IKGusBFOz/tN8NVAhXu45U5wB41EVV+fRKcODPdVPU2b1dI0RpL RtwvZQbS4kgZN4bu3pjCR32LHbyD8Y1N01Thzl3TlndTZo1u+6F5MIgL7EyQErTsPKBc3LXQk2H xjyT65i/n3qp12l8Ja1892vv5FIXxnfo6mfq4aXqZtEamwm9FmJAypVESnfvoodbydB/Enrzg99 uk6ya1qT3/vKaXJ8N3tsc4MOhcwS82XDxjADntekAFtoVjfy9vhxoYUKT+hWXd+41p6BGl2hgKH 2wYFDc6IR6RWodoZd7pwH1GFZt/Z+anl5r8+FqFUO8RSQxzUiclCweDbghMn1pLP9Ga9SS1r8O7 kM5qmK82FMBYrUe+3Zsdv7TlwH2LRPNEXsX+HH3vqdQgn+8ZzHuUBmb16fmcZi3/PVPhM0+TBlf BTl+VEbGPVimvcw== 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 l2t_data. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/cou= nted_by.cocci Cc: Raju Rangoju 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: Gustavo A. R. Silva --- drivers/net/ethernet/chelsio/cxgb3/l2t.h | 2 +- drivers/net/ethernet/chelsio/cxgb4/l2t.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/chelsio/cxgb3/l2t.h b/drivers/net/etherne= t/chelsio/cxgb3/l2t.h index ea75f275023f..646ca0bc25bd 100644 --- a/drivers/net/ethernet/chelsio/cxgb3/l2t.h +++ b/drivers/net/ethernet/chelsio/cxgb3/l2t.h @@ -76,7 +76,7 @@ struct l2t_data { atomic_t nfree; /* number of free entries */ rwlock_t lock; struct rcu_head rcu_head; /* to handle rcu cleanup */ - struct l2t_entry l2tab[]; + struct l2t_entry l2tab[] __counted_by(nentries); }; =20 typedef void (*arp_failure_handler_func)(struct t3cdev * dev, diff --git a/drivers/net/ethernet/chelsio/cxgb4/l2t.c b/drivers/net/etherne= t/chelsio/cxgb4/l2t.c index a10a6862a9a4..1e5f5b1a22a6 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/l2t.c +++ b/drivers/net/ethernet/chelsio/cxgb4/l2t.c @@ -59,7 +59,7 @@ struct l2t_data { rwlock_t lock; atomic_t nfree; /* number of free entries */ struct l2t_entry *rover; /* starting point for next allocation */ - struct l2t_entry l2tab[]; /* MUST BE LAST */ + struct l2t_entry l2tab[] __counted_by(l2t_size); /* MUST BE LAST */ }; =20 static inline unsigned int vlan_prio(const struct l2t_entry *e) --=20 2.34.1