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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id t10-20020a170902d14a00b0015eb200cc00sm2752880plt.138.2022.05.03.18.52.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:52:44 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , Stefan Richter , linux1394-devel@lists.sourceforge.net, 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 , "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" , James Morris , Jarkko Sakkinen , Jaroslav Kysela , Jason Gunthorpe , Jens Axboe , Johan Hedberg , Johannes Berg , 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 , 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-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, "Serge E. Hallyn" , SHA-cyfmac-dev-list@infineon.com, Simon Horman , Stefano Stabellini , 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 18/32] firewire: Use __mem_to_flex_dup() with struct iso_interrupt_event Date: Tue, 3 May 2022 18:44:27 -0700 Message-Id: <20220504014440.3697851-19-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=2017; h=from:subject; bh=En62c6cYeUTmU8jbvcTu7IkYSFHpDUIXfTMNPx9PLGc=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqEY3t8cFKELeYkm2NJIduUgR+ZPwYvLuYXHKSq h9RlNwCJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHahAAKCRCJcvTf3G3AJmzQD/ 40OwL2hRSWj9CwaOb0EjwNMYNrEpXdJJUx4PtLsO50tNm7kViyp0rIIENwt0Refm3UMfgJOd4uhpAP UnN8m9LoCHDWTn2Ip+vIMDS3s7F5W2nAcbk5hF/C+qyUcxpZ01AbHR+GyZjxwzVt9qEG+TAXzPRQnp dfwWrtSjiyM2jKV9PjBNt6qRhM7Jxt/+wokWBFK4eM8IKP5wMTPXf0n1BGa/3mFi6dkoZD+yXtl4IT q4PePWOvlJ8zihIyMKu6xe3P2Cd5gPfwiDcsKwkrzufOJPHAEhY8riHbDxYytvqLGG7bw341elDFvM fFg+b/yC+gowOuz1miET0BDC+cA6vVe4BMDspdtGoFbNEJfsp72+AkNfwxKDENX6TekjFRU3iHzOci lPoBqEyf2AILOQko5Kh9u3twT5Z6Azf7bj/NRatR/QKpZXBkjRcvBCR8SN8nlgdnYckPdhxRBU5YUS IHSagdIFo3kzcAF1P/Aq785Nakdj4SMvQp66HlJm0gKK57rvSGhQtlRXIDROMfObo/Dar+MBASK/fr qWo15PcDT/tqMlbzcrYAAB4BcvmIgHfXG5riesv5IcmZv6ehMHVZTaM4Sf1wIA6V0OWztJpmHeUVBs 1l35/YNa44KeLfFackz/5o7jU6Cqxn/jknqaXV6GkQkL2jafxDjZYhz781sQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@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: Stefan Richter Cc: linux1394-devel@lists.sourceforge.net Signed-off-by: Kees Cook --- drivers/firewire/core-cdev.c | 7 ++----- include/uapi/linux/firewire-cdev.h | 4 ++-- 2 files changed, 4 insertions(+), 7 deletions(-) diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index c9fe5903725a..7e884c61e12e 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -913,17 +913,14 @@ static void iso_callback(struct fw_iso_context *context, u32 cycle, size_t header_length, void *header, void *data) { struct client *client = data; - struct iso_interrupt_event *e; + struct iso_interrupt_event *e = NULL; - e = kmalloc(sizeof(*e) + header_length, GFP_ATOMIC); - if (e == NULL) + if (__mem_to_flex_dup(&e, .interrupt, header, header_length, GFP_ATOMIC)) return; e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; e->interrupt.closure = client->iso_closure; e->interrupt.cycle = cycle; - e->interrupt.header_length = header_length; - memcpy(e->interrupt.header, header, header_length); queue_event(client, &e->event, &e->interrupt, sizeof(e->interrupt) + header_length, NULL, 0); } diff --git a/include/uapi/linux/firewire-cdev.h b/include/uapi/linux/firewire-cdev.h index 5effa9832802..22c5f59e9dfa 100644 --- a/include/uapi/linux/firewire-cdev.h +++ b/include/uapi/linux/firewire-cdev.h @@ -264,8 +264,8 @@ struct fw_cdev_event_iso_interrupt { __u64 closure; __u32 type; __u32 cycle; - __u32 header_length; - __u32 header[0]; + __DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(__u32, header_length); + __DECLARE_FLEX_ARRAY_ELEMENTS(__u32, header); }; /**