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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 8D5C7C2D0C3 for ; Mon, 16 Dec 2019 22:24:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 58E4E21835 for ; Mon, 16 Dec 2019 22:24:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="SkB51O8F" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726900AbfLPWY6 (ORCPT ); Mon, 16 Dec 2019 17:24:58 -0500 Received: from sonic306-28.consmr.mail.ne1.yahoo.com ([66.163.189.90]:36335 "EHLO sonic306-28.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726699AbfLPWY5 (ORCPT ); Mon, 16 Dec 2019 17:24:57 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1576535096; bh=/tjZqQ3eFg6RGmAZKeaCUxadHu2YVRy2b3KPUAFCwsc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=SkB51O8Fx6dj+KNQ4G1wkp3knm7ptTIO/t4V5I/ZjR1IPDouLKKflYJGW+bJdFBkAXA2z7SjqDXMH42YIa438SU7BI8wuCp8iloXjieNqcVFtxdecr1p2DaC2mMitCSYZ3Hcec+sxqydeRObj3VAzBfSrNA7hoCiM0+y6cjZShSxXKsS8SAJy+ULt8bavk2i0AmIGLu6D2XOv7c9F1VoUoux02frORsVHuGOEKHiuLnKucwn8SDMvRDbjwdiirk5NbulgY9AT8sL8Dj5Oz2eM0ZuEuL006X2UTBips8pXxVou6b8ULxww8UdSyEPZKE1yf9tNdasfNOks6WY2SR13g== X-YMail-OSG: NzRtvQoVM1kw7u92EQpbZM0BK655550GnPkVHUaF2tqcXezFRoCow9NVIDxcY0h Ho83zsfy58L4NN9UF6eHKaZ.0H0kg7vLFPYHY9H1dgq7Bcffmcmz.yGL9IWa3XsNZizbJFrZkn4u AUYPQybZmlsYkehUKyxq90.Nb5cKBFO4kqHNxgdo2xYWx.mqeU5d283ihJ64OVfXKlCsCaHTkXsF .Poa7EGoHOwA1GB0VixdI7rxUScuNdUApXTR57b.ZN9ZPi6791pE8O.apZhQP5FxGpvaDG9OVmjl eePvfDSYPFcjQfchVZdg2p.H8HHea59EHQ.6Yrw7BAYbj3nFr1Q5oSRrH8aneQ6UyXADPVC8iHa2 qZ9YKvmxSxqHm5OgBaUCOzu1b.4ygqMroUAeqMvifDv1SWAxNp7PU7nl6GSYN9yMYNhIxzaMVuX3 bRjFGtXbyxK_m_8VFvGDuWXBio9zO8woklmC_8b8yyxFqNXxBc4uDauUdAokHkEZPhw7l2mwWcLM uZDqjCSzMAQ_XZAl7yI0DApqY2mmYYHU.iVofz8L_QVSfNdYl0jEaAnqoayCbnnGTzLkIHY5K.69 3VtpJSHKqstBmLwdUJVLyOJj9GyYgm.eopXmCVVcEG.cup0Q4cFxph93TisMA2mZvakiGihtTfqG l_woegn14llpDie6HOKuWHX0CIBGUwwe.VJrkIP1a5bSryZzA.Gq87D3FQ6hl67edfqM0pTtufrb RQlDKh6xmxD3OQBSdcbpqFJ7S.NHL6hMzG9.oAeIg46BgOgGci326RV0FcpxnEu4zhLDs5xRm4xc mMkQhbhiLoqgjYlvrxIa34HZoE0ulTIWi3_1ajv7rLLFZStYsqw2P5mBlr1czlDIiwGWfB15CfDO eyOCQIbUn43s2ByFhVD.AaKSVAgNPLOL8tYXsJs1XKVcyTI5s7QcnMfC5Ai3VroYf2pWVTvY4mTY Rr6BzieTLlvzXvbZ60wp.ROxlE2qP92JDRjCLUOJsKVtBmlEcBezqhkAhuxnoM6czVBkkNNewuUG mVuIr4S0nks_h2veBNbXxj2.UtllOe.Ostz.WuqbA2phZyI5iP33.rikp0q.lZnrWlGtSlPhOXXX noOsePfIrjrLo7UBLEiYxSJGKmg0m4ord8GH4y7BMhyi0AamwZOqmHbPJ6oRky9AYXGdEeNurLfj roc_H.keMrqVMeF5._ddnAoVM0dWq2WJl3p2PHwyHgkafvJnfyUgU9t6Kdar5jv0tVarGxLDI81U C_SF7t2xASu8FZ94yoDj01uN4FhVlcdTU.uu1vuEo1ihzORjK7NA3UBqt2I1nOmxjJGtmIKaQjDl pXebcCSlmG_3YJBSVCU6im0EfHRQXpkm4c8coRNb7aDxzuUJ5A5xhWNLD1_KDDMyu0Fb1tBbpO7Z JCSyWnG5AF7qbfPVMnqAFEiY9Y9YFrOJwSYUhz.ofwle6qIoBKuKZQ5fsQnV0sUdx.w-- Received: from sonic.gate.mail.ne1.yahoo.com by sonic306.consmr.mail.ne1.yahoo.com with HTTP; Mon, 16 Dec 2019 22:24:56 +0000 Received: by smtp412.mail.gq1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 1be22e4886451d124518193455ee7ee2; Mon, 16 Dec 2019 22:24:54 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH v12 04/25] LSM: Use lsmblob in security_kernel_act_as Date: Mon, 16 Dec 2019 14:24:10 -0800 Message-Id: <20191216222431.4956-5-casey@schaufler-ca.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191216222431.4956-1-casey@schaufler-ca.com> References: <20191216222431.4956-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Change the security_kernel_act_as interface to use a lsmblob structure in place of the single u32 secid in support of module stacking. Change its only caller, set_security_override, to do the same. Change that one's only caller, set_security_override_from_ctx, to call it with the new parameter type. Reviewed-by: Kees Cook Reviewed-by: John Johansen Signed-off-by: Casey Schaufler --- include/linux/cred.h | 3 ++- include/linux/security.h | 5 +++-- kernel/cred.c | 10 ++++++---- security/security.c | 14 ++++++++++++-- 4 files changed, 23 insertions(+), 9 deletions(-) diff --git a/include/linux/cred.h b/include/linux/cred.h index 18639c069263..03ae0182cba6 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -18,6 +18,7 @@ struct cred; struct inode; +struct lsmblob; /* * COW Supplementary groups list @@ -165,7 +166,7 @@ extern const struct cred *override_creds(const struct cred *); extern void revert_creds(const struct cred *); extern struct cred *prepare_kernel_cred(struct task_struct *); extern int change_create_files_as(struct cred *, struct inode *); -extern int set_security_override(struct cred *, u32); +extern int set_security_override(struct cred *, struct lsmblob *); extern int set_security_override_from_ctx(struct cred *, const char *); extern int set_create_files_as(struct cred *, struct inode *); extern int cred_fscmp(const struct cred *, const struct cred *); diff --git a/include/linux/security.h b/include/linux/security.h index 9c6dbe248eaf..322ed9622819 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -437,7 +437,7 @@ void security_cred_free(struct cred *cred); int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp); void security_transfer_creds(struct cred *new, const struct cred *old); void security_cred_getsecid(const struct cred *c, u32 *secid); -int security_kernel_act_as(struct cred *new, u32 secid); +int security_kernel_act_as(struct cred *new, struct lsmblob *blob); int security_kernel_create_files_as(struct cred *new, struct inode *inode); int security_kernel_module_request(char *kmod_name); int security_kernel_load_data(enum kernel_load_data_id id); @@ -1043,7 +1043,8 @@ static inline void security_transfer_creds(struct cred *new, { } -static inline int security_kernel_act_as(struct cred *cred, u32 secid) +static inline int security_kernel_act_as(struct cred *cred, + struct lsmblob *blob) { return 0; } diff --git a/kernel/cred.c b/kernel/cred.c index c0a4c12d38b2..846ac4b23c16 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -732,14 +732,14 @@ EXPORT_SYMBOL(prepare_kernel_cred); /** * set_security_override - Set the security ID in a set of credentials * @new: The credentials to alter - * @secid: The LSM security ID to set + * @blob: The LSM security information to set * * Set the LSM security ID in a set of credentials so that the subjective * security is overridden when an alternative set of credentials is used. */ -int set_security_override(struct cred *new, u32 secid) +int set_security_override(struct cred *new, struct lsmblob *blob) { - return security_kernel_act_as(new, secid); + return security_kernel_act_as(new, blob); } EXPORT_SYMBOL(set_security_override); @@ -755,6 +755,7 @@ EXPORT_SYMBOL(set_security_override); */ int set_security_override_from_ctx(struct cred *new, const char *secctx) { + struct lsmblob blob; u32 secid; int ret; @@ -762,7 +763,8 @@ int set_security_override_from_ctx(struct cred *new, const char *secctx) if (ret < 0) return ret; - return set_security_override(new, secid); + lsmblob_init(&blob, secid); + return set_security_override(new, &blob); } EXPORT_SYMBOL(set_security_override_from_ctx); diff --git a/security/security.c b/security/security.c index bfea9739c084..cee032b5ce29 100644 --- a/security/security.c +++ b/security/security.c @@ -1615,9 +1615,19 @@ void security_cred_getsecid(const struct cred *c, u32 *secid) } EXPORT_SYMBOL(security_cred_getsecid); -int security_kernel_act_as(struct cred *new, u32 secid) +int security_kernel_act_as(struct cred *new, struct lsmblob *blob) { - return call_int_hook(kernel_act_as, 0, new, secid); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.kernel_act_as, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + rc = hp->hook.kernel_act_as(new, blob->secid[hp->lsmid->slot]); + if (rc != 0) + return rc; + } + return 0; } int security_kernel_create_files_as(struct cred *new, struct inode *inode) -- 2.20.1