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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id e7-20020a62ee07000000b0050dc7628187sm7109908pfi.97.2022.05.03.18.57.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:57:44 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , David Howells , Jarkko Sakkinen , James Morris , "Serge E. Hallyn" , keyrings@vger.kernel.org, linux-security-module@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 S. Miller" , Dennis Dalessandro , devicetree@vger.kernel.org, Dexuan Cui , Dmitry Kasatkin , Eli Cohen , Eric Dumazet , 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 , Jakub Kicinski , "James E.J. Bottomley" , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Johan Hedberg , Johannes Berg , Johannes Berg , John Keeping , Juergen Gross , Kalle Valo , Keith Packard , 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-usb@vger.kernel.org, linux-wireless@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 , netdev@vger.kernel.org, Nick Desaulniers , =?utf-8?q?Nuno_S=C3=A1?= , Paolo Abeni , Paul Moore , Rich Felker , Rob Herring , Russell King , selinux@vger.kernel.org, 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 27/32] KEYS: Use mem_to_flex_dup() with struct user_key_payload Date: Tue, 3 May 2022 18:44:36 -0700 Message-Id: <20220504014440.3697851-28-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=2171; h=from:subject; bh=+EMqJweUKHRI+p140UR53z0ouyFfaCeLO7XO6/7BouU=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqGhXIUX0opXFG+79dwIKeyeoTVzZjDz3s4gqRG WcoAdoCJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHahgAKCRCJcvTf3G3AJpigD/ 9+hUDrqvhbexCJ+LI5xyfbONc0He6AfGv1OpoTuMyM/EDr+8Hlw69lTHvEd33pGAWnTcfLgvPFr5do SNqT7Ky9GohochNniXjI7VRAtZrFkRiG4130PztKwnvQ1ESHLdO+N8oQLoe0xNaVekFqVoLBQkU9ev NHp8YraJs7P1h9w8Pzngx6LtwE4pUvGsFmXmsBhmx5Uk1uiQ2UWzwtYPWYzdgEo1mTJ+BX1FT2/meR Eat9ZR2zS06PJ4uns7jc0qp4FerfBCuZHWMHvuzUrZLKj8YxmjyZPUn166vO9ypE2CX9eBtY3kFi3n EmX0Ryqm38lbokKGz+VyWMmMBepuljd3Kfm8eTAac9jztiqctLEmKqxMqXkQxGfDluj5udRd3fZOOR lag1NSmzJGGy19dHbynOZKZH+nGjFmGobp3C/7rBrswBDkGAbM9kHRt0+D9nPRbomIChQdinr+YNdi taMC+Zbtg73jiBg4SNGk9uXdxHdHcrvUozaxfZNwaBq19qR/CzNl695UzIFzTsoHUgCgp8UNwQOrIX 147/aQi6XAgsy4OrML7xnIyf5cn/Lol5s3J5+7HAqw9FmH4FhWg/atdWEZT71eREnRWKn+j7VQWUSS sH4Cq8R0Hlz39XjL9tHdhH6lg4wbDgAXnwYK6YZ7bEVdBr2fYMufUIc2hMWw== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@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: David Howells Cc: Jarkko Sakkinen Cc: James Morris Cc: "Serge E. Hallyn" Cc: keyrings@vger.kernel.org Cc: linux-security-module@vger.kernel.org Signed-off-by: Kees Cook --- include/keys/user-type.h | 4 ++-- security/keys/user_defined.c | 7 ++----- 2 files changed, 4 insertions(+), 7 deletions(-) diff --git a/include/keys/user-type.h b/include/keys/user-type.h index 386c31432789..4e67ff902a32 100644 --- a/include/keys/user-type.h +++ b/include/keys/user-type.h @@ -26,8 +26,8 @@ */ struct user_key_payload { struct rcu_head rcu; /* RCU destructor */ - unsigned short datalen; /* length of this data */ - char data[] __aligned(__alignof__(u64)); /* actual data */ + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(unsigned short, datalen); + DECLARE_FLEX_ARRAY_ELEMENTS(char, data) __aligned(__alignof__(u64)); }; extern struct key_type key_type_user; diff --git a/security/keys/user_defined.c b/security/keys/user_defined.c index 749e2a4dcb13..2fb84894cdaa 100644 --- a/security/keys/user_defined.c +++ b/security/keys/user_defined.c @@ -58,21 +58,18 @@ EXPORT_SYMBOL_GPL(key_type_logon); */ int user_preparse(struct key_preparsed_payload *prep) { - struct user_key_payload *upayload; + struct user_key_payload *upayload = NULL; size_t datalen = prep->datalen; if (datalen <= 0 || datalen > 32767 || !prep->data) return -EINVAL; - upayload = kmalloc(sizeof(*upayload) + datalen, GFP_KERNEL); - if (!upayload) + if (mem_to_flex_dup(&upayload, prep->data, datalen, GFP_KERNEL)) return -ENOMEM; /* attach the data */ prep->quotalen = datalen; prep->payload.data[0] = upayload; - upayload->datalen = datalen; - memcpy(upayload->data, prep->data, datalen); return 0; } EXPORT_SYMBOL_GPL(user_preparse);