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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id p29sm4918970pfw.141.2021.08.17.23.14.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:12 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Ariel Elior , Sudarsana Kalluru , GR-everest-linux-l2@marvell.com, "David S. Miller" , Jakub Kicinski , netdev@vger.kernel.org, "Gustavo A. R. Silva" , Greg Kroah-Hartman , Andrew Morton , linux-wireless@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, Rasmus Villemoes , linux-hardening@vger.kernel.org Subject: [PATCH v2 17/63] bnx2x: Use struct_group() for memcpy() region Date: Tue, 17 Aug 2021 23:04:47 -0700 Message-Id: <20210818060533.3569517-18-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210818060533.3569517-1-keescook@chromium.org> References: <20210818060533.3569517-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=3830; h=from:subject; bh=GkN0LVVLNQH/53cAo4VYkKN66rn+11NBIFFE2ztC6YM=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMhRw9LfaYvUc+sf+L0uY8MlzrAk1ef7MCxvB9t k6OtDqOJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjIQAKCRCJcvTf3G3AJifDD/ 9c0n+kvuNRhg8rqC3IlmdQj3GSvDZWsG+FKvThaAwsrcm5zgUTbPwQ6iL1wr4Jk3ViFO6PKwpuQs+W kYs8Ff8+E5QKNzTFYv9f3U+QrUgXZuliPkgx2C9OIEVvt2UEnDYPUhUqHBMLx0BXSCvr7kVoiYR8b2 iu457PTEfCQPJdDfKt78EEPnPsrqkubZweDgt/Gq/PsCcnEku9oGBRvz1KKVnO8QWy9TYdunjBP41s 792+Xj9Zh+GH4ISZfO3dP/vihbtHZcRxlUtqy2yT76MawS9BzD6PInHIpTeYQxnPOICMfQPusrHTT7 ndnKvr9GSg7peInc8FmZqYcs6y4mjJE/eklW07D6UJI9TtDjmKiqTTBOdNU43zM6qWjHal537hZmIe 9zFtdGwmUuRUgeltJDGJ4yXIugnOVn6G6DSwMAlT/S3hVGlxpguq6rEv6/0IWLa23jWt9JpGwJ1Jjj o+t/SbwzCJ0ClfKocBAik/2Za+ZKR9dJgOeM/G8xa98QQfHOvYYuIP//mv1JYcM1fvVbNymKySQfVs 8/HAgbbCc54arSAMkCFxkUT/fPiS/v1RbgtjVl9VmyC/p3ATw++a51ydTf5AAZxt2GMj+TS/xSz84B SiFL9TGxlTtdNqLwvPbVXHgt96CGuJjKFxAMufc9C7Zx6iAgBZyMu4MpCY0w== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-block@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() in struct nig_stats around members egress_mac_pkt0_lo, egress_mac_pkt0_hi, egress_mac_pkt1_lo, and egress_mac_pkt1_hi (and the respective members in struct bnx2x_eth_stats), 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 struct bnx2x_eth_stats's rx_stat_ifhcinbadoctets_hi. "pahole" shows no size nor member offset changes to either struct. "objdump -d" shows no meaningful object code changes (i.e. only source line number induced differences and optimizations). Additionally adds BUILD_BUG_ON() to compare the separate struct group sizes. Cc: Ariel Elior Cc: Sudarsana Kalluru Cc: GR-everest-linux-l2@marvell.com Cc: "David S. Miller" Cc: Jakub Kicinski Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c | 7 ++++--- drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h | 14 ++++++++++---- 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c index 0b193edb73b8..2bb133ae61c3 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c @@ -849,7 +849,8 @@ static int bnx2x_hw_stats_update(struct bnx2x *bp) memcpy(old, new, sizeof(struct nig_stats)); - memcpy(&(estats->rx_stat_ifhcinbadoctets_hi), &(pstats->mac_stx[1]), + BUILD_BUG_ON(sizeof(estats->shared) != sizeof(pstats->mac_stx[1])); + memcpy(&(estats->shared), &(pstats->mac_stx[1]), sizeof(struct mac_stx)); estats->brb_drop_hi = pstats->brb_drop_hi; estats->brb_drop_lo = pstats->brb_drop_lo; @@ -1634,9 +1635,9 @@ void bnx2x_stats_init(struct bnx2x *bp) REG_RD(bp, NIG_REG_STAT0_BRB_TRUNCATE + port*0x38); if (!CHIP_IS_E3(bp)) { REG_RD_DMAE(bp, NIG_REG_STAT0_EGRESS_MAC_PKT0 + port*0x50, - &(bp->port.old_nig_stats.egress_mac_pkt0_lo), 2); + &(bp->port.old_nig_stats.egress_mac_pkt0), 2); REG_RD_DMAE(bp, NIG_REG_STAT0_EGRESS_MAC_PKT1 + port*0x50, - &(bp->port.old_nig_stats.egress_mac_pkt1_lo), 2); + &(bp->port.old_nig_stats.egress_mac_pkt1), 2); } /* Prepare statistics ramrod data */ diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h index d55e63692cf3..ae93c078707b 100644 --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.h @@ -36,10 +36,14 @@ struct nig_stats { u32 pbf_octets; u32 pbf_packet; u32 safc_inp; - u32 egress_mac_pkt0_lo; - u32 egress_mac_pkt0_hi; - u32 egress_mac_pkt1_lo; - u32 egress_mac_pkt1_hi; + struct_group(egress_mac_pkt0, + u32 egress_mac_pkt0_lo; + u32 egress_mac_pkt0_hi; + ); + struct_group(egress_mac_pkt1, + u32 egress_mac_pkt1_lo; + u32 egress_mac_pkt1_hi; + ); }; enum bnx2x_stats_event { @@ -83,6 +87,7 @@ struct bnx2x_eth_stats { u32 no_buff_discard_hi; u32 no_buff_discard_lo; + struct_group(shared, u32 rx_stat_ifhcinbadoctets_hi; u32 rx_stat_ifhcinbadoctets_lo; u32 tx_stat_ifhcoutbadoctets_hi; @@ -159,6 +164,7 @@ struct bnx2x_eth_stats { u32 tx_stat_dot3statsinternalmactransmiterrors_lo; u32 tx_stat_bmac_ufl_hi; u32 tx_stat_bmac_ufl_lo; + ); u32 pause_frames_received_hi; u32 pause_frames_received_lo; -- 2.30.2