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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id l11-20020a170903244b00b001896522a23bsm6079889pls.39.2022.12.02.13.44.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 02 Dec 2022 13:44:16 -0800 (PST) From: Kees Cook To: Krzysztof Kozlowski Cc: Kees Cook , syzbot+210e196cef4711b65139@syzkaller.appspotmail.com, "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, "John W. Linville" , Ilan Elias , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH] NFC: nci: Bounds check struct nfc_target arrays Date: Fri, 2 Dec 2022 13:44:14 -0800 Message-Id: <20221202214410.never.693-kees@kernel.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2256; h=from:subject:message-id; bh=n38/3uuX4410R1aGCzc71edAU/gWj6X1zXWrsLo0q5E=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBjinGuw9AiLTFgZ2UDY++dtaynqpFfMyigMIt160pK ee1aIJKJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCY4pxrgAKCRCJcvTf3G3AJsegD/ 9N+U73mJr9v0gHh/kToM/CJ+NIvX2uOd70w9qQx+80nvu6s8mAimVc/WqdKgKiGaHwI/MB7MeX3680 M3TTlhY0zPpxQmE1YqEinfwgJA/fPSEeLZTOOZTv//2I55qEQlCLeLhXgsDBjLugwkSAVuPVm42cN/ 7H7qHMJbWKQMtKCQq+m6DnWny0yJ0HVg/U/S4P/gm3yrmucn1lQVwgjPz/mBYlCZB4034RK/hB4uSM ezB89qAqeEYsr8VMUax8G9Fa7XpRqYEFP1631YQnAOGa1MarRDPj3D8CWYh3EGAeWSqgaBfJy5bGo4 n7p6K/f9kmhPj7nOmTkOvQQoybaoI+Du0SPz/EcyZ2T1CsvXDgN3Cf/fb8PnaQIjapBRoID9s/vbll 5jjtI/kD2gfRN6g1en+nLqsg1h5xBuvKxD/RqahO+7hjl4wsdVjqsKfllgP5T6lOvAElrWa81NEoUC msimSI7M5BeWLg8UWduhC5gzjWkqdqXqidvCNCYW0ZLFaEqReGgLlEJAlNW/ovQZ3fvFJtqZdZQmZ3 /zGoY12Jgtth1OHHrKhp8Zt9Mp/PDkuJdL8ng6eHYxwzC8epuC7EikoXcNja3br3WN8YC2vGOiERy0 eH5BIcNgglzTcTiGsBqRK4mqvOylDhDTmFz+hw+eST+SF2hu7PNVavvwTHkA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While running under CONFIG_FORTIFY_SOURCE=y, syzkaller reported: memcpy: detected field-spanning write (size 129) of single field "target->sensf_res" at net/nfc/nci/ntf.c:260 (size 18) This appears to be a legitimate lack of bounds checking in nci_add_new_protocol(). Add the missing checks. Reported-by: syzbot+210e196cef4711b65139@syzkaller.appspotmail.com Link: https://lore.kernel.org/lkml/0000000000001c590f05ee7b3ff4@google.com Fixes: 019c4fbaa790 ("NFC: Add NCI multiple targets support") Cc: Krzysztof Kozlowski Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- net/nfc/nci/ntf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/nfc/nci/ntf.c b/net/nfc/nci/ntf.c index 282c51051dcc..994a0a1efb58 100644 --- a/net/nfc/nci/ntf.c +++ b/net/nfc/nci/ntf.c @@ -240,6 +240,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, target->sens_res = nfca_poll->sens_res; target->sel_res = nfca_poll->sel_res; target->nfcid1_len = nfca_poll->nfcid1_len; + if (target->nfcid1_len > ARRAY_SIZE(target->nfcid1)) + return -EPROTO; if (target->nfcid1_len > 0) { memcpy(target->nfcid1, nfca_poll->nfcid1, target->nfcid1_len); @@ -248,6 +250,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, nfcb_poll = (struct rf_tech_specific_params_nfcb_poll *)params; target->sensb_res_len = nfcb_poll->sensb_res_len; + if (target->sensb_res_len > ARRAY_SIZE(target->sensb_res)) + return -EPROTO; if (target->sensb_res_len > 0) { memcpy(target->sensb_res, nfcb_poll->sensb_res, target->sensb_res_len); @@ -256,6 +260,8 @@ static int nci_add_new_protocol(struct nci_dev *ndev, nfcf_poll = (struct rf_tech_specific_params_nfcf_poll *)params; target->sensf_res_len = nfcf_poll->sensf_res_len; + if (target->sensf_res_len > ARRAY_SIZE(target->sensf_res)) + return -EPROTO; if (target->sensf_res_len > 0) { memcpy(target->sensf_res, nfcf_poll->sensf_res, target->sensf_res_len); -- 2.34.1