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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id f4sm5114783pgi.68.2021.07.27.13.59.03 (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 07/64] staging: rtl8192e: Use struct_group() for memcpy() region Date: Tue, 27 Jul 2021 13:57:58 -0700 Message-Id: <20210727205855.411487-8-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=4368; h=from:subject; bh=whsZXL1+VyeGGVCEni/WVzZTdGJot/iTzZPaNe8UUr4=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBhAHOBTnFFuq2+zkjlQr57HB6KOpEDyaB2ijAbcALO MKTd4mmJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYQBzgQAKCRCJcvTf3G3AJqgfEA CpVSQGeMGU5eUl64arg0mbKqIDJKPLDrfc3TEtQwzpULtWAtStxgtXWkqjgD3gLSOMuwG3ih74xg0+ hTraIVtKZb1lrnvbvn3GZRfBp0n2qpK2QBFNx2/+F5nXotHQOKPORNJRAJydSL2viaQ7OEoyIpM2Me D8nL5yC8ZGHK0A4lVP55GAkIj7LrR+BeEpWkybNkHdiFl+rs+n4d4Y5K5W5VNlMcjt7QuPReCHC+Qv WWBBoNfTHJEW2CoFe5zCDER42ROLFDvt+sDPfKsVQI9Z1vlUsnpX5iYDzQzaEdNq+qiG5STf7DfJpl 7boSirsHUslj5fLDMwcf6eJddWbh6fTv3G3t/wGWDeNMTPM9I87kUfIxdOVlVxwZJTtQzRkVKiO6cj QPIENJ4Jr0y7lIw5VC2PrLb1k1OrOLVMITkShgU/vOEYCHwsAbSV5+hZl++Mr/JP53hPfwiDGK6fkO h4jnthinSH7U1p3zBAyyW/U4j8y0rc+SLpCnVJzA8pK+h/cwKcNF3miP5pu2wcEnonqvq0pO27EukH en9phkwP2ZomfnVI6QII0zHonJUw0qciBinwVIIvS0xAoNPj7fCpwMkcIuj4N/wj+xN3kwpZ7ix0Dv AmxT/glSjzUIz5WJPhvBRwvRJLLJLoIbc44SjjMc/R2fFjtCYNoSHk1KJRtw== 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 memcpy(), memmove(), and memset(), avoid intentionally writing across neighboring fields. Use struct_group() around members addr1, addr2, and addr3 in struct rtllib_hdr_4addr, and members qui, qui_type, qui_subtype, version, and ac_info in struct rtllib_qos_information_element, 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 addr1 and qui. "pahole" shows no size nor member offset changes to struct rtllib_hdr_4addr nor struct rtllib_qos_information_element. "objdump -d" shows no meaningful object code changes (i.e. only source line number induced differences and optimizations). Signed-off-by: Kees Cook --- drivers/staging/rtl8192e/rtllib.h | 20 ++++++++++++-------- drivers/staging/rtl8192e/rtllib_crypt_ccmp.c | 3 ++- drivers/staging/rtl8192e/rtllib_rx.c | 8 ++++---- 3 files changed, 18 insertions(+), 13 deletions(-) diff --git a/drivers/staging/rtl8192e/rtllib.h b/drivers/staging/rtl8192e/rtllib.h index c6f8b772335c..547579070a82 100644 --- a/drivers/staging/rtl8192e/rtllib.h +++ b/drivers/staging/rtl8192e/rtllib.h @@ -759,9 +759,11 @@ struct rtllib_hdr_3addr { struct rtllib_hdr_4addr { __le16 frame_ctl; __le16 duration_id; - u8 addr1[ETH_ALEN]; - u8 addr2[ETH_ALEN]; - u8 addr3[ETH_ALEN]; + struct_group(addrs, + u8 addr1[ETH_ALEN]; + u8 addr2[ETH_ALEN]; + u8 addr3[ETH_ALEN]; + ); __le16 seq_ctl; u8 addr4[ETH_ALEN]; u8 payload[]; @@ -921,11 +923,13 @@ union frameqos { struct rtllib_qos_information_element { u8 elementID; u8 length; - u8 qui[QOS_OUI_LEN]; - u8 qui_type; - u8 qui_subtype; - u8 version; - u8 ac_info; + struct_group(data, + u8 qui[QOS_OUI_LEN]; + u8 qui_type; + u8 qui_subtype; + u8 version; + u8 ac_info; + ); } __packed; struct rtllib_qos_ac_parameter { diff --git a/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c b/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c index b60e2a109ce4..66b3a13fced7 100644 --- a/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c +++ b/drivers/staging/rtl8192e/rtllib_crypt_ccmp.c @@ -133,7 +133,8 @@ static int ccmp_init_iv_and_aad(struct rtllib_hdr_4addr *hdr, pos = (u8 *) hdr; aad[0] = pos[0] & 0x8f; aad[1] = pos[1] & 0xc7; - memcpy(aad + 2, hdr->addr1, 3 * ETH_ALEN); + BUILD_BUG_ON(sizeof(hdr->addrs) != (3 * ETH_ALEN)); + memcpy(aad + 2, &hdr->addrs, 3 * ETH_ALEN); pos = (u8 *) &hdr->seq_ctl; aad[20] = pos[0] & 0x0f; aad[21] = 0; /* all bits masked */ diff --git a/drivers/staging/rtl8192e/rtllib_rx.c b/drivers/staging/rtl8192e/rtllib_rx.c index c2209c033838..9c4b686d2756 100644 --- a/drivers/staging/rtl8192e/rtllib_rx.c +++ b/drivers/staging/rtl8192e/rtllib_rx.c @@ -1576,13 +1576,13 @@ static int rtllib_read_qos_param_element(struct rtllib_qos_parameter_info *info_element) { int ret = 0; - u16 size = sizeof(struct rtllib_qos_parameter_info) - 2; + u16 size = sizeof(element_param->info_element.data); if ((info_element == NULL) || (element_param == NULL)) return -1; if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) { - memcpy(element_param->info_element.qui, info_element->data, + memcpy(&element_param->info_element.data, info_element->data, info_element->len); element_param->info_element.elementID = info_element->id; element_param->info_element.length = info_element->len; @@ -1601,7 +1601,7 @@ static int rtllib_read_qos_info_element(struct rtllib_qos_information_element *info_element) { int ret = 0; - u16 size = sizeof(struct rtllib_qos_information_element) - 2; + u16 size = sizeof(element_info->data); if (element_info == NULL) return -1; @@ -1610,7 +1610,7 @@ static int rtllib_read_qos_info_element(struct rtllib_qos_information_element if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) { - memcpy(element_info->qui, info_element->data, + memcpy(&element_info->data, info_element->data, info_element->len); element_info->elementID = info_element->id; element_info->length = info_element->len;