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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id g8sm4556875pfu.30.2021.07.27.14.06.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jul 2021 14:06:50 -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 44/64] iw_cxgb4: Use memset_after() for cpl_t5_pass_accept_rpl Date: Tue, 27 Jul 2021 13:58:35 -0700 Message-Id: <20210727205855.411487-45-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=2100; h=from:subject; bh=gV9IZTM5qU7jcRGph/XDG3+fKRJKxoN9HOMcsfOyL0A=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOK/UN78x/osAzwgMKupSwSrhwjEeLTXqK++CZi 7CH6/zyJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzigAKCRCJcvTf3G3AJi+aD/ 9wSoxGLjbf3nMxhdx0FTNoLb7tUlFlGp+wsA1eq4h8eLG5OlOTzsA8IwsIgBPWp2/c4lh/3h8Wej9u tFFoUjbe3EwfDLU01dywIYam3R6J6s+TD7jpKeWz0MWD2NFKTvNmK/r5nlDA+crVlsHLnuBl7ozHdp Uoh/Bz4xC9nN82aPUAif26+yocqytHa2sw58nHCezNegk9sqBcHUCoNnFodMubFs/UgzD7hGOsd+1B aOhnYDdb2QaqaHaKTplZpcofR90e0xKWhk0CRSg83IE3RApySZo8s2Q4xTS1Ma3eB82/7z+gvwQXWY hia/xw+mpgLBcAZ0jCu/itWg4QCogWD2bkotmQJEfjL9TXjZCGUa2NGLC/CnEfFKcyutnljBecv1EH 0Q9xXQNOo4tw2JZcb6z7NV4dR0L+tjj3BeFNlPgNbG4VgwmG7uKubRriMRe5NSZBE38cW0fSq5rQ3Y T/5J6pZ+p6FMSSVheYF8tjScBuAHu1NRrxeGGj9Wx4M222kdbmFmeXqMdbCPWOgSfuuCWozDcs7p7z +9BLk6YAP2L0i/Fh9KBLAPtQ43onOWXv77p4r/RE/gXudIT6F++lAYSdbKOI9/3skSabDHdxRbQYhk 1gswdeOGaLRaDVm2CSKXSrfli04Bjbp+JUMycYvzS0p20FUxvYZuh3eQYepg== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org In preparation for FORTIFY_SOURCE performing compile-time and run-time field bounds checking for memset(), avoid intentionally writing across neighboring fields. Use memset_after() so memset() doesn't get confused about writing beyond the destination member that is intended to be the starting point of zeroing through the end of the struct. Additionally, since everything appears to perform a roundup (including allocation), just change the size of the struct itself and add a build-time check to validate the expected size. Signed-off-by: Kees Cook --- drivers/infiniband/hw/cxgb4/cm.c | 5 +++-- drivers/net/ethernet/chelsio/cxgb4/t4_msg.h | 2 +- 2 files changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/cxgb4/cm.c b/drivers/infiniband/hw/cxgb4/cm.c index 291471d12197..7129ae025b2d 100644 --- a/drivers/infiniband/hw/cxgb4/cm.c +++ b/drivers/infiniband/hw/cxgb4/cm.c @@ -2471,7 +2471,8 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, skb_get(skb); rpl = cplhdr(skb); if (!is_t4(adapter_type)) { - skb_trim(skb, roundup(sizeof(*rpl5), 16)); + BUILD_BUG_ON(sizeof(*rpl5) != roundup(sizeof(*rpl5), 16)); + skb_trim(skb, sizeof(*rpl5)); rpl5 = (void *)rpl; INIT_TP_WR(rpl5, ep->hwtid); } else { @@ -2487,7 +2488,7 @@ static int accept_cr(struct c4iw_ep *ep, struct sk_buff *skb, opt2 |= CONG_CNTRL_V(CONG_ALG_TAHOE); opt2 |= T5_ISS_F; rpl5 = (void *)rpl; - memset(&rpl5->iss, 0, roundup(sizeof(*rpl5)-sizeof(*rpl), 16)); + memset_after(rpl5, 0, opt0); if (peer2peer) isn += 4; rpl5->iss = cpu_to_be32(isn); diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h index fed5f93bf620..26433a62d7f0 100644 --- a/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h +++ b/drivers/net/ethernet/chelsio/cxgb4/t4_msg.h @@ -497,7 +497,7 @@ struct cpl_t5_pass_accept_rpl { __be32 opt2; __be64 opt0; __be32 iss; - __be32 rsvd; + __be32 rsvd[3]; }; struct cpl_act_open_req {