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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id j10-20020a62b60a000000b0050dc762817dsm6922289pff.87.2022.05.03.18.47.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 May 2022 18:47:41 -0700 (PDT) From: Kees Cook To: "Gustavo A . R . Silva" Cc: Kees Cook , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Kuniyuki Iwashima , Alexei Starovoitov , Cong Wang , Al Viro , netdev@vger.kernel.org, alsa-devel@alsa-project.org, 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 , 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 , Johannes Berg , John Keeping , Juergen Gross , Kalle Valo , Keith Packard , keyrings@vger.kernel.org, kunit-dev@googlegroups.com, "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-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 , 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 14/32] af_unix: Use mem_to_flex_dup() with struct unix_address Date: Tue, 3 May 2022 18:44:23 -0700 Message-Id: <20220504014440.3697851-15-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=2272; h=from:subject; bh=8b5W7mEG2Sah1C3FkS/UxctivFJh7iOzV6P8ujUbZM8=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBicdqDcR3znMx51jViMoq05/q58V2/1rXjoJjYBmJ4 CKXc5kiJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYnHagwAKCRCJcvTf3G3AJp8ZEA CTZiOebtApgRIMQFGfvlsj7s1U7ENKry+y1qCoH7clKk+kIHUFtKQuToAucuA7HnBVAIDqbBHa+dtu b1A4bqv4cHK21pPyhZmiE0VCyP00EYC8X6VbBCMRrhOvgKIRCQKYCDRRU3x3+zdTamMi+Cw4QRLFbr KeEVo3vWRxKFNYlUY6py6WsFnpaTCP45A1Rt2Mk1ONM+4tvkRlgJQKibXiiVxMmNJiq7diRyS43UyZ xdZzOY9N/SsdVs+DBAetVCVJfwnmWSxup+qwrjzAenumL1egb53niPav19Uu0KPGAkzqPtS4NDain6 T5G8UOgj2W4S/ZIxVzp3AEI0v7Q07cg9AUILFEUOEn2Ga7m2xtn/dn5Hqt0Gq5ryDybbgCBb0FW6nE apZrvb6JoF5ZEkWIMx0CD3b/SEJCPUMr1n+n/nlozI3/5uYk+uJuq11ezAU6BWwGeaiQi5MNENuLtJ f2iVuD520n1Ne+0aDX0g+6Bxq6CjD/3mk3NtQkdQZ1W7jF6hmMJWqPx/GWYvlmDlmSQNEQ659WICV6 styiy2WjRaD2LhpwT9sZHwcdpjjTGhsJ3rXcC+FrO5v7LrNOaE49f+5vGV2+PdIn7TzyijsyYCwjfC sD4MdxKc4Kc8wvaGgok8h676GkR5iOBRUeFIUjcwGTrf9mDGBR6ew5hwb4cQ== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Precedence: bulk List-ID: X-Mailing-List: selinux@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 S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: Kuniyuki Iwashima Cc: Alexei Starovoitov Cc: Cong Wang Cc: Al Viro Cc: netdev@vger.kernel.org Signed-off-by: Kees Cook --- include/net/af_unix.h | 14 ++++++++++++-- net/unix/af_unix.c | 7 ++----- 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/include/net/af_unix.h b/include/net/af_unix.h index a7ef624ed726..422535b71295 100644 --- a/include/net/af_unix.h +++ b/include/net/af_unix.h @@ -25,8 +25,18 @@ extern struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; struct unix_address { refcount_t refcnt; - int len; - struct sockaddr_un name[]; + DECLARE_FLEX_ARRAY_ELEMENTS_COUNT(int, len); + union { + DECLARE_FLEX_ARRAY(struct sockaddr_un, name); + /* + * While a struct is used to access the flexible + * array, it may only be partially populated, and + * "len" above is actually tracking bytes, not a + * count of struct sockaddr_un elements, so also + * include a byte-size flexible array. + */ + DECLARE_FLEX_ARRAY_ELEMENTS(u8, bytes); + }; }; struct unix_skb_parms { diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index e1dd9e9c8452..8410cbc82ded 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -244,15 +244,12 @@ EXPORT_SYMBOL_GPL(unix_peer_get); static struct unix_address *unix_create_addr(struct sockaddr_un *sunaddr, int addr_len) { - struct unix_address *addr; + struct unix_address *addr = NULL; - addr = kmalloc(sizeof(*addr) + addr_len, GFP_KERNEL); - if (!addr) + if (mem_to_flex_dup(&addr, sunaddr, addr_len, GFP_KERNEL)) return NULL; refcount_set(&addr->refcnt, 1); - addr->len = addr_len; - memcpy(addr->name, sunaddr, addr_len); return addr; }