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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id j20sm4672710pfc.203.2021.07.27.13.59.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 13:59:05 -0700 (PDT) From: Kees Cook To: linux-hardening@vger.kernel.org Cc: Kees Cook , "Gustavo A. R. Silva" , Keith Packard , Greg Kroah-Hartman , Andrew Morton , linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org, netdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-staging@lists.linux.dev, linux-block@vger.kernel.org, linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com Subject: [PATCH 06/64] bnxt_en: Use struct_group_attr() for memcpy() region Date: Tue, 27 Jul 2021 13:57:57 -0700 Message-Id: <20210727205855.411487-7-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727205855.411487-1-keescook@chromium.org> References: <20210727205855.411487-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2358; h=from:subject; bh=urnr1c0HuSr0zcemksTCEth1t70QAfbHaEcP+c1mXUA=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOBqioJQ+1gy1GQQan/jf7RJ1/WXH5A0qXVd7xV vq5+5hOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzgQAKCRCJcvTf3G3AJiWREA CNm4WJeCn47J5obmfhInAVhQHs+WaRodzYXqYlwhYZwqztfgNWLmnuTFB7WixSIet+ogzFMJ1r7fzU QnWXAsLuJ3BX98gUGzvKpmV42J3D2bYmtlrZs7Eyhzqsf8YU/1DgzM/cyzoMB1MkY7QVnFyA9ECldc n4XuqAu3QiaIe+5lzEXU3cW0wy5VDaO3U89VhsX3c6FWjMhQ0FF71U5yZVlZ7s8QMcwjgGQ/rSZ5HS tHMaYMmuprGsc0WRWDxssLMce4AZIdKRwnQBGxYX56oM9u/26JaL77KjZeahVv+n4nC+KkXfWFoSls jO+qT1zevLJBtQfWAqBgbtl6mxUkW3D/0aBPlL7o63ss885dcW9pWjj8sVkqG2AOPVUcl+mMOp+VQm 5qmqUeZbnxJVtXjSRXpvzpBMjNj47QiFJaRRu++FQ9+TJ9TwFws9C31mCXsNjIBK/xzNCc0OuY/J2T Fuuz5AL5SsvRzztZGGQvpjWG2xGgfilhJucEqfeyaJrFQIvjGMIAVFYzMGX4dwwIpBMhxVU4spof3f TLNENoSRR30/sOaQWASgjwj8RqwZ3WioWr4/ALRyqYdHD8j5usq3wgrSpYlAC1AQpefx1uLVDOyes3 1j+4vL+JqxKC93LWdqu/2gVD/VBJnBjDTcrSW3GQTmYSKuzKxca2WKziYSew== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. Use struct_group() around members queue_id, min_bw, max_bw, tsa, pri_lvl, and bw_weight so they can be referenced together. This will allow memcpy() and sizeof() to more easily reason about sizes, improve readability, and avoid future warnings about writing beyond the end of queue_id. "pahole" shows no size nor member offset changes to struct bnxt_cos2bw_cfg. "objdump -d" shows no meaningful object code changes (i.e. only source line number induced differences and optimizations). Signed-off-by: Kees Cook --- drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c | 4 ++-- drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h | 14 ++++++++------ 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c index 8a68df4d9e59..95c636f89329 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.c @@ -148,10 +148,10 @@ static int bnxt_hwrm_queue_cos2bw_qcfg(struct bnxt *bp, struct ieee_ets *ets) } data = &resp->queue_id0 + offsetof(struct bnxt_cos2bw_cfg, queue_id); - for (i = 0; i < bp->max_tc; i++, data += sizeof(cos2bw) - 4) { + for (i = 0; i < bp->max_tc; i++, data += sizeof(cos2bw.cfg)) { int tc; - memcpy(&cos2bw.queue_id, data, sizeof(cos2bw) - 4); + memcpy(&cos2bw.cfg, data, sizeof(cos2bw.cfg)); if (i == 0) cos2bw.queue_id = resp->queue_id0; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h index 6eed231de565..716742522161 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_dcb.h @@ -23,13 +23,15 @@ struct bnxt_dcb { struct bnxt_cos2bw_cfg { u8 pad[3]; - u8 queue_id; - __le32 min_bw; - __le32 max_bw; + struct_group_attr(cfg, __packed, + u8 queue_id; + __le32 min_bw; + __le32 max_bw; #define BW_VALUE_UNIT_PERCENT1_100 (0x1UL << 29) - u8 tsa; - u8 pri_lvl; - u8 bw_weight; + u8 tsa; + u8 pri_lvl; + u8 bw_weight; + ); u8 unused; }; -- 2.30.2