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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id x5-20020aa79a45000000b004fa743ba3f9sm7108890pfj.2.2022.05.03.18.47.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:47:39 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , Johannes Berg , "David S. Miller" , Jakub Kicinski , Paolo Abeni , Eric Dumazet , linux-wireless@vger.kernel.org, netdev@vger.kernel.org, Alexei Starovoitov , alsa-devel@alsa-project.org, Al Viro , Andrew Gabbasov , Andrew Morton , Andy Gross , Andy Lavr , Arend van Spriel , Baowen Zheng , Bjorn Andersson , Boris Ostrovsky , Bradley Grove , brcm80211-dev-list.pdl@broadcom.com, Christian Brauner , =?utf-8?q?Christian_G=C3=B6ttsche?= , Christian Lamparter , Chris Zankel , Cong Wang , Daniel Axtens , Daniel Vetter , Dan Williams , David Gow , David Howells , Dennis Dalessandro , devicetree@vger.kernel.org, Dexuan Cui , Dmitry Kasatkin , Eli Cohen , Eric Paris , Eugeniu Rosca , Felipe Balbi , Francis Laniel , Frank Rowand , Franky Lin , Greg Kroah-Hartman , Gregory Greenman , Guenter Roeck , Haiyang Zhang , Hante Meuleman , Herbert Xu , Hulk Robot , "James E.J. Bottomley" , James Morris , Jarkko Sakkinen , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Johan Hedberg , Johannes Berg , John Keeping , Juergen Gross , Kalle Valo , Keith Packard , keyrings@vger.kernel.org, kunit-dev@googlegroups.com, Kuniyuki Iwashima , "K. Y. Srinivasan" , Lars-Peter Clausen , Lee Jones , Leon Romanovsky , Liam Girdwood , linux1394-devel@lists.sourceforge.net, linux-afs@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-bluetooth@vger.kernel.org, linux-hardening@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-integrity@vger.kernel.org, linux-rdma@vger.kernel.org, linux-scsi@vger.kernel.org, linux-security-module@vger.kernel.org, linux-usb@vger.kernel.org, linux-xtensa@linux-xtensa.org, llvm@lists.linux.dev, Loic Poulain , Louis Peens , Luca Coelho , Luiz Augusto von Dentz , Marc Dionne , Marcel Holtmann , Mark Brown , "Martin K. Petersen" , Max Filippov , Mimi Zohar , Muchun Song , Nathan Chancellor , Nick Desaulniers , =?utf-8?q?Nuno_S=C3=A1?= , Paul Moore , Rich Felker , Rob Herring , Russell King , selinux@vger.kernel.org, "Serge E. Hallyn" , SHA-cyfmac-dev-list@infineon.com, Simon Horman , Stefano Stabellini , Stefan Richter , Steffen Klassert , Stephen Hemminger , Stephen Smalley , Tadeusz Struk , Takashi Iwai , Tom Rix , Udipto Goswami , Vincenzo Frascino , wcn36xx@lists.infradead.org, Wei Liu , xen-devel@lists.xenproject.org, Xiu Jianfeng , Yang Yingliang Subject: [PATCH 12/32] cfg80211: Use mem_to_flex_dup() with struct cfg80211_bss_ies Date: Tue, 3 May 2022 18:44:21 -0700 Message-Id: <20220504014440.3697851-13-keescook@chromium.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220504014440.3697851-1-keescook@chromium.org> References: <20220504014440.3697851-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4271; h=from:subject; bh=zLIoLyad9bBq8i+CHRJcAMhW5JgPaoyM4x0VIL3Wjf8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqDR3XqoFSprf0Mf1o1HYj7dBBBP7wDZ118xdTx ToM0RNGJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHagwAKCRCJcvTf3G3AJpDCD/ wMlRRCUB8XTmCXlLdvPCGb5ACTTMa3Km0myBmfsx6i7FkHxAEfNtllJsJZ1xGdv/WP8g4XEUJ0zuGC 7wsRbPVl7sHYNyFiAu9iXMMSYvJVG0G1YrRXdH2A3UhX8o4+JfEVNj7XazhRyhM9cIwvTR0hQBUIKJ OO0TtkviYxesRpL1xBvgYIcCWjxEvNdpsGjAfF7Wn6Ml1dOstypUTb2ulq7hIf7BX8w63KuqOXZx6V eQKW4gi3cQO3gPoEWsv9zeDktQzxWbaMN212KDtDCB76/UH1i+QQg8eLLlaSQ/55nnf45kUX75sHkI zDmnUC7uL8hJaFE7/98/TeYKsLAgbyP1/MwzniEWgtSaLkPJj+BDTLhK4+jBB7zxpXsyQsyJXmfWnN 69jBTE8Z6ldaOWiCaA2dwzQcHNWXsHvzTspOWk/Tiv7AIUHd8Nqe4ecJtsbDBBxQU21ogSn3TNlfat 3ZCTfW1XDttiZNSK2Rit27Gb0LCzE4nKpVwxT5qmFoGk/jjq2ZfP1uWkMyv4TOb/bfGw5ZiXtTJwtA 22mI6CUOQ9lCD1lIB2WdB8z0yibGypy9fbuDpeqzg6v+weYYD4cY0Q38ZtkdzpABByyOAlmZm7iXIU /hIQA44hD8/vgfuYEgBfavnXALP3koZt6viHAklNZAsuY6wiAG9ZgR2ZT8XQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org As part of the work to perform bounds checking on all memcpy() uses, replace the open-coded a deserialization of bytes out of memory into a trailing flexible array by using a flex_array.h helper to perform the allocation, bounds checking, and copying. Cc: Johannes Berg Cc: "David S. Miller" Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Eric Dumazet Cc: linux-wireless@vger.kernel.org Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- include/net/cfg80211.h | 4 ++-- net/wireless/scan.c | 21 ++++++--------------- 2 files changed, 8 insertions(+), 17 deletions(-) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index 68713388b617..fa236015f6ef 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -2600,9 +2600,9 @@ struct cfg80211_inform_bss { struct cfg80211_bss_ies { u64 tsf; struct rcu_head rcu_head; - int len; + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(int, len); bool from_beacon; - u8 data[]; + DECLARE_FLEX_ARRAY_ELEMENTS(u8, data); }; /** diff --git a/net/wireless/scan.c b/net/wireless/scan.c index 4a6d86432910..9f53d05c6aaa 100644 --- a/net/wireless/scan.c +++ b/net/wireless/scan.c @@ -1932,7 +1932,7 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy, gfp_t gfp) { struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); - struct cfg80211_bss_ies *ies; + struct cfg80211_bss_ies *ies = NULL; struct ieee80211_channel *channel; struct cfg80211_internal_bss tmp = {}, *res; int bss_type; @@ -1978,13 +1978,10 @@ cfg80211_inform_single_bss_data(struct wiphy *wiphy, * override the IEs pointer should we have received an earlier * indication of Probe Response data. */ - ies = kzalloc(sizeof(*ies) + ielen, gfp); - if (!ies) + if (mem_to_flex_dup(&ies, ie, ielen, gfp)) return NULL; - ies->len = ielen; ies->tsf = tsf; ies->from_beacon = false; - memcpy(ies->data, ie, ielen); switch (ftype) { case CFG80211_BSS_FTYPE_BEACON: @@ -2277,7 +2274,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, size_t ielen = len - offsetof(struct ieee80211_mgmt, u.probe_resp.variable); size_t new_ie_len; - struct cfg80211_bss_ies *new_ies; + struct cfg80211_bss_ies *new_ies = NULL; const struct cfg80211_bss_ies *old; u8 cpy_len; @@ -2314,8 +2311,7 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, if (!new_ie) return; - new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC); - if (!new_ies) + if (mem_to_flex_dup(&new_ies, new_ie, new_ie_len, GFP_ATOMIC)) goto out_free; pos = new_ie; @@ -2333,10 +2329,8 @@ cfg80211_update_notlisted_nontrans(struct wiphy *wiphy, memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len))); /* update ie */ - new_ies->len = new_ie_len; new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control); - memcpy(new_ies->data, new_ie, new_ie_len); if (ieee80211_is_probe_resp(mgmt->frame_control)) { old = rcu_access_pointer(nontrans_bss->proberesp_ies); rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies); @@ -2363,7 +2357,7 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, gfp_t gfp) { struct cfg80211_internal_bss tmp = {}, *res; - struct cfg80211_bss_ies *ies; + struct cfg80211_bss_ies *ies = NULL; struct ieee80211_channel *channel; bool signal_valid; struct ieee80211_ext *ext = NULL; @@ -2442,14 +2436,11 @@ cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy, capability = le16_to_cpu(mgmt->u.probe_resp.capab_info); } - ies = kzalloc(sizeof(*ies) + ielen, gfp); - if (!ies) + if (mem_to_flex_dup(&ies, variable, ielen, gfp)) return NULL; - ies->len = ielen; ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp); ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) || ieee80211_is_s1g_beacon(mgmt->frame_control); - memcpy(ies->data, variable, ielen); if (ieee80211_is_probe_resp(mgmt->frame_control)) rcu_assign_pointer(tmp.pub.proberesp_ies, ies);