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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id q3sm5628541pgl.23.2021.08.17.23.14.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 17 Aug 2021 23:14:19 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Potnuri Bharat Teja , Doug Ledford , Jason Gunthorpe , Raju Rangoju , "David S. Miller" , Jakub Kicinski , linux-rdma@vger.kernel.org, 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 46/63] iw_cxgb4: Use memset_startat() for cpl_t5_pass_accept_rpl Date: Tue, 17 Aug 2021 23:05:16 -0700 Message-Id: <20210818060533.3569517-47-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=2404; h=from:subject; bh=rquyWjDPJAfPxGH6VKiA2jIuZnWvLU6UgPqN/0FyQ/s=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhHKMoZBU+AZTLPLboKA2tsHcUYnxXofUjzUeVV5jM TIxpyi+JAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYRyjKAAKCRCJcvTf3G3AJvHSD/ 44+6rU5jvReItNvFdWkzxvCu3Zfc98qUS6K5JULs74yaY9KObRjykrNvK0Am5wl91nOIUyOidTpbY8 gj5vdxz6Zn5qaupcsAyy9fMyJ/+o6OIVPQVkpg4q/1xaUe9XJBw7EuoHQ00xZOSITrFQxedJAa0OAv dDdUw2IJMSVp1BsKrqZ8zwnx6OGNmdcku1qJXAyXdUPATD3x8PsX1xW9/NxTPuIQTj7FklQQxnfOVi VM13p6OU2dfVTiA1MK0kBRp4tdKoR/yNDNbe6P8SBH4R+bXwe0CsulDmCc2+ySkpmoFz5Zs02RsCMW GqoOF37v9Un0rA9+BTw45+PmTWENIznqpoX86i1KrfPcRoQNLXy9z8wlq+eLzIvdRxFlRQ0KUXkX0f 0gvjYVFDNzhTQYMNABAPN1q4DUm5J4vXD2Na1e16bvF0v0fmgTDLw5ZjtW+s7lUQKEkjmMqeBNOT+Y xctphKqxjE0Q3GAfUhUMBlcKKfnVS0MkEPrQpdYePDhu92xpbEb1MR4J6wYY4kSlPNUtkpnSkccN1L /8vDJalPNghDaWw+eZU5YfymPY1LdOBA+9X5cVqUEglZUr356BU/Ynk+xpBRobnBRlejxkrHcHUA4g f+Tt4SJV/gbQboppXKrKMmuQZiynIRvgIxU13ahhCZLHHDEZKdsOOAbppgSQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: netdev@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_startat() 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. Cc: Potnuri Bharat Teja Cc: Doug Ledford Cc: Jason Gunthorpe Cc: Raju Rangoju Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-rdma@vger.kernel.org Cc: netdev@vger.kernel.org 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..6519ea8ebf23 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, iss); 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 {