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=-10.8 required=3.0 tests=BAYES_00,DATE_IN_PAST_06_12, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 169FBC433E8 for ; Tue, 28 Jul 2020 20:29:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E9FF42074F for ; Tue, 28 Jul 2020 20:29:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728772AbgG1U3H (ORCPT ); Tue, 28 Jul 2020 16:29:07 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:38568 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728346AbgG1U3H (ORCPT ); Tue, 28 Jul 2020 16:29:07 -0400 Received: from static-50-53-54-182.bvtn.or.frontiernet.net ([50.53.54.182] helo=[192.168.192.153]) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1k0WDX-0004ri-M8; Tue, 28 Jul 2020 20:28:55 +0000 Subject: Re: [PATCH v19 04/23] LSM: Use lsmblob in security_kernel_act_as To: Casey Schaufler , casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: linux-audit@redhat.com, keescook@chromium.org, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov References: <20200724203226.16374-1-casey@schaufler-ca.com> <20200724203226.16374-5-casey@schaufler-ca.com> From: John Johansen Autocrypt: addr=john.johansen@canonical.com; prefer-encrypt=mutual; keydata= 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Schaufler wrote: > 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. > > The security module hook is unchanged, still taking a secid. > The infrastructure passes the correct entry from the lsmblob. > lsmblob_init() is used to fill the lsmblob structure, however > this will be removed later in the series when security_secctx_to_secid() > is undated to provide a lsmblob instead of a secid. > fix ^ "undated" to updated > Reviewed-by: Kees Cook > Reviewed-by: John Johansen > Acked-by: Stephen Smalley > 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 294410533b51..6d403a522918 100644 > --- a/include/linux/security.h > +++ b/include/linux/security.h > @@ -441,7 +441,7 @@ 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); > @@ -1055,7 +1055,8 @@ 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 421b1149c651..22e0e7cbefde 100644 > --- a/kernel/cred.c > +++ b/kernel/cred.c > @@ -733,14 +733,14 @@ 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); > > @@ -756,6 +756,7 @@ EXPORT_SYMBOL(set_security_override); > */ > int set_security_override_from_ctx(struct cred *new, const char *secctx) > { > + struct lsmblob blob; > u32 secid; > int ret; > > @@ -763,7 +764,8 @@ 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 f9a249a93215..d6d882b1f7d5 100644 > --- a/security/security.c > +++ b/security/security.c > @@ -1692,9 +1692,19 @@ 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) >