From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5D555C4741F for ; Fri, 6 Nov 2020 15:56:39 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C245A22202 for ; Fri, 6 Nov 2020 15:56:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="tUHYQlCo" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C245A22202 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 51B5D6B0068; Fri, 6 Nov 2020 10:56:38 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 4F2DD6B006C; Fri, 6 Nov 2020 10:56:38 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4084B6B006E; Fri, 6 Nov 2020 10:56:38 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0250.hostedemail.com [216.40.44.250]) by kanga.kvack.org (Postfix) with ESMTP id 143BD6B0068 for ; Fri, 6 Nov 2020 10:56:38 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id B6D963489 for ; Fri, 6 Nov 2020 15:56:37 +0000 (UTC) X-FDA: 77454446034.19.loss66_391775a272d3 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin19.hostedemail.com (Postfix) with ESMTP id 848361AD1BA for ; Fri, 6 Nov 2020 15:56:37 +0000 (UTC) X-HE-Tag: loss66_391775a272d3 X-Filterd-Recvd-Size: 8634 Received: from mail-qt1-f202.google.com (mail-qt1-f202.google.com [209.85.160.202]) by imf20.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Nov 2020 15:56:36 +0000 (UTC) Received: by mail-qt1-f202.google.com with SMTP id 7so1167494qtw.23 for ; Fri, 06 Nov 2020 07:56:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=bu5Eked262Yqjy7vLc/7v5hG2v0AiZ5jBwjzS/hxCOs=; b=tUHYQlCoc1s5aYJya18uS22d3UTuNreyZaKH6b0+Ng+PkQNmxnwx/JRRmeKT/1/OcR frWxCzVol+m7glkfQxEe73L334XNz/jIEy+tEgEZUXRq3RkFUIyCQu3x7Rr4CyiJ/wXO 9ySAck5isc2WeflM37CgZNunVBJ8j821EZYJ+kAgIeVVTRzZfU7+YbZjck9gyOOBW7nW WROEbsyT+zeadQHQRTJi7J66JE/EJCU32eUBVmtJ7PBQluRf9Y0/vshho6deYxMWhZko VN7pFN0kLzw9/HQKP08olKfvHXlzt5rZtGai+w7yJ2bKtseW3mYGE20jP55W/6ksA0VZ 9lbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=bu5Eked262Yqjy7vLc/7v5hG2v0AiZ5jBwjzS/hxCOs=; b=Sbi703UnX/p1jQLCchWJUwAEMERIIPKp4Fl/1uxIziglnfEnzHShbwoUfRzYcV0wzy BFWTO26bsRAvkNOsJT9tYM3Cz5wk226Dwd6gqwoI/6xC8kKDL98iukkoj+dHdUfoDE3t a2iYDDrFg+/bv5GtT+5kFB8GgL81uqpnUr5LcYDLhkQmjegm3Zx3sRT04PgicZiLVraZ p6C5IhE4iMhTaIJxWi03LTqE5NuG7uCaKX6y/LZwICpNXOUqFrV/FJaVWMF4bscAqAe3 j35obamhRoGPRgkwWszD6HPE+rsiMUm5Q4YxVTO39oJZIC1r8Hq/K9PBChWnxKZzkv+r nrag== X-Gm-Message-State: AOAM5305eHuS7MEDy/vogtrG6HLuRVZyTx0axMcM97Ok8vx3MTVS/I9E GOowsa7XBwk6FTzz5aKNAmXbJkWNY3DRhmmL8Q== X-Google-Smtp-Source: ABdhPJx+CvqAWS4teVk5tHn3xTDEntP/bcjs0s4pTYnq0DlDWFNArmUzSNYmwEA+ClpRT/MWBvBIXsXRX4Fbm0AB8w== X-Received: from lg.mtv.corp.google.com ([2620:15c:211:202:f693:9fff:fef4:29dd]) (user=lokeshgidra job=sendgmr) by 2002:a0c:e40c:: with SMTP id o12mr2222905qvl.29.1604678195875; Fri, 06 Nov 2020 07:56:35 -0800 (PST) Date: Fri, 6 Nov 2020 07:56:23 -0800 In-Reply-To: <20201106155626.3395468-1-lokeshgidra@google.com> Message-Id: <20201106155626.3395468-2-lokeshgidra@google.com> Mime-Version: 1.0 References: <20201106155626.3395468-1-lokeshgidra@google.com> X-Mailer: git-send-email 2.29.1.341.ge80a0c044ae-goog Subject: [PATCH v12 1/4] security: add inode_init_security_anon() LSM hook From: Lokesh Gidra To: Andrea Arcangeli , Alexander Viro , James Morris , Stephen Smalley , Casey Schaufler , Eric Biggers Cc: "Serge E. Hallyn" , Paul Moore , Eric Paris , Lokesh Gidra , Daniel Colascione , Kees Cook , "Eric W. Biederman" , KP Singh , David Howells , Thomas Cedeno , Anders Roxell , Sami Tolvanen , Matthew Garrett , Aaron Goidel , Randy Dunlap , "Joel Fernandes (Google)" , YueHaibing , Christian Brauner , Alexei Starovoitov , Alexey Budankov , Adrian Reber , Aleksa Sarai , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org, kaleshsingh@google.com, calin@google.com, surenb@google.com, nnk@google.com, jeffv@google.com, kernel-team@android.com, linux-mm@kvack.org, Andrew Morton , hch@infradead.org Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This change adds a new LSM hook, inode_init_security_anon(), that will be used while creating secure anonymous inodes. The hook allows/denies its creation and assigns a security context to the inode. The new hook accepts an optional context_inode parameter that callers can use to provide additional contextual information to security modules for granting/denying permission to create an anon-inode of the same type. This context_inode's security_context can also be used to initialize the newly created anon-inode's security_context. Signed-off-by: Lokesh Gidra --- include/linux/lsm_hook_defs.h | 2 ++ include/linux/lsm_hooks.h | 9 +++++++++ include/linux/security.h | 10 ++++++++++ security/security.c | 8 ++++++++ 4 files changed, 29 insertions(+) diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h index 32a940117e7a..435a2e22ff95 100644 --- a/include/linux/lsm_hook_defs.h +++ b/include/linux/lsm_hook_defs.h @@ -113,6 +113,8 @@ LSM_HOOK(void, LSM_RET_VOID, inode_free_security, struct inode *inode) LSM_HOOK(int, 0, inode_init_security, struct inode *inode, struct inode *dir, const struct qstr *qstr, const char **name, void **value, size_t *len) +LSM_HOOK(int, 0, inode_init_security_anon, struct inode *inode, + const struct qstr *name, const struct inode *context_inode) LSM_HOOK(int, 0, inode_create, struct inode *dir, struct dentry *dentry, umode_t mode) LSM_HOOK(int, 0, inode_link, struct dentry *old_dentry, struct inode *dir, diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index c503f7ab8afb..3af055b7ee1f 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -233,6 +233,15 @@ * Returns 0 if @name and @value have been successfully set, * -EOPNOTSUPP if no security attribute is needed, or * -ENOMEM on memory allocation failure. + * @inode_init_security_anon: + * Set up the incore security field for the new anonymous inode + * and return whether the inode creation is permitted by the security + * module or not. + * @inode contains the inode structure + * @name name of the anonymous inode class + * @context_inode optional related inode + * Returns 0 on success, -EACCES if the security module denies the + * creation of this inode, or another -errno upon other errors. * @inode_create: * Check permission to create a regular file. * @dir contains inode structure of the parent of the new file. diff --git a/include/linux/security.h b/include/linux/security.h index bc2725491560..7494a93b9ed9 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -323,6 +323,9 @@ void security_inode_free(struct inode *inode); int security_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, initxattrs initxattrs, void *fs_data); +int security_inode_init_security_anon(struct inode *inode, + const struct qstr *name, + const struct inode *context_inode); int security_old_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, const char **name, void **value, size_t *len); @@ -737,6 +740,13 @@ static inline int security_inode_init_security(struct inode *inode, return 0; } +static inline int security_inode_init_security_anon(struct inode *inode, + const struct qstr *name, + const struct inode *context_inode) +{ + return 0; +} + static inline int security_old_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, diff --git a/security/security.c b/security/security.c index a28045dc9e7f..8989ba6af4f6 100644 --- a/security/security.c +++ b/security/security.c @@ -1058,6 +1058,14 @@ int security_inode_init_security(struct inode *inode, struct inode *dir, } EXPORT_SYMBOL(security_inode_init_security); +int security_inode_init_security_anon(struct inode *inode, + const struct qstr *name, + const struct inode *context_inode) +{ + return call_int_hook(inode_init_security_anon, 0, inode, name, + context_inode); +} + int security_old_inode_init_security(struct inode *inode, struct inode *dir, const struct qstr *qstr, const char **name, void **value, size_t *len) -- 2.29.1.341.ge80a0c044ae-goog