From patchwork Thu Jul 22 00:47:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12392583 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=-16.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 2B477C6377A for ; Thu, 22 Jul 2021 00:50:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1243E61263 for ; Thu, 22 Jul 2021 00:50:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229984AbhGVAJo (ORCPT ); Wed, 21 Jul 2021 20:09:44 -0400 Received: from sonic314-27.consmr.mail.ne1.yahoo.com ([66.163.189.153]:46013 "EHLO sonic314-27.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229817AbhGVAJn (ORCPT ); Wed, 21 Jul 2021 20:09:43 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626915018; bh=xOLQEX3NjYP3s3amYow2zmZWMivOg+cKGCZNoXSHOdA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=bz3c1Fsd9nnYov85ddBngTGQovvzUz9qjEfZe6Nw5Db7G8Eiymrxezq1tz9OKkrs2m7+Vi/3veN4iFAlD9ttWsH7qlHERrDr5pAQh68P4KabLKxSxpXyzTwzsSOV2jxjaS6UfowIHdO6n8D+FFr5WKm5ihd2jB3IINANasfdgPo1aP/TEWhqrKN1Mw8UHpjy/HEoA30xQK9OMV/8zhGycxro7Y41qWiMW9/wZZ6ZNslGdmho4nDP0Vsv+s8fmbq12gfn9WmiIhqkmrEoN/tZSjdf/2rKBmGN/fdwAydqolN8+tdWhJQ7pQ8G4MkE8JzFrYNGDIm0ahd7lcelF4I+WA== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1626915018; bh=sAOMe9wM+1+bMpOS8BTKfHwYYeocLZjm50CvDPK8mFc=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=awXbOygnF5DLfw687KPjWsWg1742/MCklBQG7wwtHxsA3xV7yD7zjEqkTT4/RnERejHZ1PBnJftoqCgnki4jhPoOyKism7WwmS7eTqqMtlQQH3zxnA5PR0UnPAK7j0WohZ0Odc2vB2ar2cZk56iZZthsVWLkp1rOKi0YPJ0WK8Ja+jFR5Kod9983De4v1eJ44AYusrYa3/MB9mlSZEnL7qDVMawFoypL/Rbgvn3J3mM12Sqi5T4hZODoPYsiy1NFu2G+QeyvcpRl1rlGK4Nlq0HbmLHF+fiB0n3cPEc8UF02DGWlTLqMe+U7d2RglS9/8WlWc8kWY3Qg5+omC17PQg== X-YMail-OSG: IwDiT3wVM1lvPpAf4unBswV2HAB.Q7hdzmqVeE9S_LGQ3dxXe6vsocxegc3Wita QiJuUnYpUrvACyp80u3mzCZFX2hKGxoGrW1J6Hc8wAyaUDpqvuhXwhOck4XG1e3Gt6BZHEBmQ4hR vX07lzcCoA79obn5ibjVhMQ6QALoyQ4PWRsVAgR6tKotdqUWd9BAbTYhO4pdXZIW2zzapdO2hHkp fPTN4Al_XgD5ufEvBiqnXpOqKwYjGmLR0yOFuu_O_kDiWjOqA4RBxGU9n1dw5skDq9eph7fs_ZBk pGQohyhKfdQFO420NcFcgU1UsFwl3pTmAptVVSJU0woGI5D8D5MuehgUMhPwRlt4GpdcyIn622MG A1PQFIcfTuj7qWDPOJRnDGFW8jZoiuh__EPDKZDCcMyjMgzjGi1ns0KmuGorPeFVq1y2R.grkmy4 DKpAsrokPrPeMKcTixQsti7tevpJg9An_LpMJKPQ0AnilthEpTaedsEP2NTByVu1jE.AEhNfq4sV BxOMB8HHTSHKq9ORscjUu_hG7abo317sXe3f6y1G70KGF5EBUQMP0aGtZRmz7FKhD5VGXqmk4_ia LqOadHg3fvn1xCuLf4Rc4qoli575Yn9gnRSLpaIPVvz7tt.9x.yWgImNvg0UqAiu6HRCpIlYwyjR qP5n0li2PRVdHzLkCY59WN9qMw4uyat5Ms0nSHXOkQnm9Z8gNTalISn57jL62EFKdhbMd4gZd5IL HgAkN_aT01nIsmb4LwrHmaSgBiYjH_zEsM2LojRfTSQDcLXlncR_Qqu70PLQaJ8awjPVNL5SjZvy aDmN6ryXom5QniMZ5vSNk3zlyCy1bLKHiCWXo9v0go9w0D3hx2CqQ6Y3MjjOLn8oJdT6QnMRwrVV E56tLuicBhqFXPcc7fL1OhNDULROiSK9qdf4Nk2Xedo2Eju8mUZtAUkji6nIf3DRAJsKMt8pXrG4 e9d3FqHHGNJnXHFRIepV4PcBsnsYh95Uhl2a58A5pBggyakYVzPOe0w32X93qco1UN9lkxvDr9kx 4yhPRwZChSecmfERmkr5WNVFHsyrBxPKpFf8luJoBMZZe29rjoc0I_.F.DVX.ZHM.sZcPggWKxly icsWxOuTuZNs8ykjF6meP_yoQcZNRm2E2uoXFT8kuYJuM.b4ZrqoOY4V1P6Y3dXUftzEPVVSecO7 7kH095UEevbjtKBO7rpmVeKYG2ZZwC1D.io5OQR1fnMO0GHSBNANPfHOXTtYhWlLWO4GX5WPf.Ek ZeyjeP._fNVAmQYWiWhg2PzCdj3ntbLWP7smu8Ou2VV8vlfATn1T0D8XhW.YUr2M6p.sylOA4L9i 9s6UUZqCyqxOr9dCU332FIfpwixKVmLj5VambI77auvLrRHaOQOMQnU0NNqb32E8uw53S56bizW2 ZTAixyIdZYU0w5g2zjHEdLyq.y1u46CMYdRIt0UMCDs7PKFmzHsrLpQb40y8GvW8RrS5g7gdrSxy NK2_Duw98tScjPZNT0CHJcork5oJNYsOSMDXkueUY_ABXLFYgUQ5FjFSA8qFOHoP2RPk84uzphEm 004whjh4YM3R5e0qru3TkwDpw2Ajnfa_DT1jZYujSduFm3Bsfauk6_6tq39uSuraqQ8iIfvv5zY0 m8wZVcRkc09V_vRu5jeAZUPRtPx3W4oSMJ9oT3cjJ2L_TBf7OObZ7Zasr7HJWbLjRYLbi1juDQgV aUaDoWP.2UV6jGUDO_8cYxdQKYE7uWUiDCX8vDfbNgpip9rX6lLcnmpbBsHbtusMr2qzWnzl_270 wFMZfLzUQEFF4zK8CKwiNtF2y87EJV14k_mNgOyfBJ5t.TM6J9CLmJ4IpEK01mKIoqz3qG3oM3fL oXaxL7Y_eG10qAZc7at9cvYEsKVj1KGdxLSGPLikqbevD0JNdFeYQuz09XsqN_bWiniklcJYR4Tb HUPL9totlejy4hByFGdAatmJ20FgpcBXwBHaTway2SaPLJ5I5Btexz3sJZ8orLcunzomkjew3de0 MstYSELc8emXrfq45Thq.a1oe2HDhlXL7n1rSiPJ3DRzt6zlIJDVFz8NvTLNbiWx2qnRLp79w0TF Kr_hnzA6R56ibBeSWL_Yty85Z1demnd5cL9IR86pMdJNULL1O_QpMV1c7AZ9lVkQsLgTRML2_BOf 8HKAyExa3Zx6ZUOjAo6r6NvIUutQg3ETFsOVWbnfSGBDeWf9CbeV0qKLkFwgb.R23OIOwyUVOJOk Zifc4mdcp0q3rSvG7Z8kRNz1X1PoTAxQ2pebiX2ogSwJbWbnESlFJPmmK2niM3Elx5Xtxco.RTci O72mZnBGJ_9ZpV.fZGzadSzP7t2UYaV0aiHZc1iJ0k.5STGFKRYBu35yD9XyHxzppIPZ5l4pwmsg L2gJ6_EFIDWmRjMmcr9FUgfm_ni3afwnzn7794H9izghSczZ9zdJEXndNxg47gCA4E2NNOb2VgFM vzm8ruh0NHZMbcDi3m1mQl0FjGm_fNgDIEdIlux8oamXqH7EynZsvDMoUNMCj9ChyhL0KFvUN3_g epjSQ9EYByWdkXvm5_I3Ga8A3SWRqDldjottRfaWhFO58N0SwBh.WVGD_mUJcs.nLXa2XHvhHzL5 NM7TAruTJ5u2HyTBb26013EyCrS653cUiR.toTcgkFbON7WmbEkg31PI.VF.bX0WsPv_wnZbiJUc BvvMUyAOUdowebtkAfY6MLQCJ5.C81W1bG7Ty4AWTnvqih1.KOuOnK.DBoBP4vYvmAxIog0pXLq_ PzIZFgFFZYohaBMW_tgESsbhtYdy_X4TzaSqp6Yz_oCR2Uyhu5ODZiDkwUVESNVwYfBnU20dTMKX eS5Wi1b12L5CFjHms8QS9Mc4Y6w2GR.Un7QILptXvqht7ZrTyrIHB2XWMY3uYXwU.Zv7yuTQ_.1b 98p2izaxHo3Dy1nGMeLYNI1D4apWmLcDctRBDUlLWeERdHoUQRq23vGvT64xOhxpynN6HCrausVG Csgmju2128pZbgxFjqMp8KfcdsO2xhgnBIN6gq3P1bLzbnRw.6DF.ykJgrG7ayrSHh1aB4gdMq1S UecakbMTvi8rwxsbWeUo0RQ.6TLqyk.wMuo_1uv0ESmPqdJies64Aj3lPWOgeHXdp2nw97DV0SLV R1uwGlLS7Xi7vQDtrkdA5 X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic314.consmr.mail.ne1.yahoo.com with HTTP; Thu, 22 Jul 2021 00:50:18 +0000 Received: by kubenode545.mail-prod1.omega.ne1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 7c89054946e55b73688614d07a236aa6; Thu, 22 Jul 2021 00:50:14 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov, linux-kernel@vger.kernel.org, bpf@vger.kernel.org Subject: [PATCH v28 02/25] LSM: Add the lsmblob data structure. Date: Wed, 21 Jul 2021 17:47:35 -0700 Message-Id: <20210722004758.12371-3-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210722004758.12371-1-casey@schaufler-ca.com> References: <20210722004758.12371-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: When more than one security module is exporting data to audit and networking sub-systems a single 32 bit integer is no longer sufficient to represent the data. Add a structure to be used instead. The lsmblob structure is currently an array of u32 "secids". There is an entry for each of the security modules built into the system that would use secids if active. The system assigns the module a "slot" when it registers hooks. If modules are compiled in but not registered there will be unused slots. A new lsm_id structure, which contains the name of the LSM and its slot number, is created. There is an instance for each LSM, which assigns the name and passes it to the infrastructure to set the slot. The audit rules data is expanded to use an array of security module data rather than a single instance. Because IMA uses the audit rule functions it is affected as well. Acked-by: Stephen Smalley Acked-by: Paul Moore Acked-by: John Johansen Signed-off-by: Casey Schaufler Cc: Cc: linux-audit@redhat.com Cc: linux-security-module@vger.kernel.org Cc: selinux@vger.kernel.org To: Mimi Zohar To: Mickaël Salaün --- include/linux/audit.h | 4 +- include/linux/lsm_hooks.h | 12 ++++- include/linux/security.h | 67 ++++++++++++++++++++++++-- kernel/auditfilter.c | 24 +++++----- kernel/auditsc.c | 13 +++-- security/apparmor/lsm.c | 7 ++- security/bpf/hooks.c | 12 ++++- security/commoncap.c | 7 ++- security/integrity/ima/ima_policy.c | 40 +++++++++++----- security/landlock/cred.c | 2 +- security/landlock/fs.c | 2 +- security/landlock/ptrace.c | 2 +- security/landlock/setup.c | 5 ++ security/landlock/setup.h | 1 + security/loadpin/loadpin.c | 8 +++- security/lockdown/lockdown.c | 7 ++- security/safesetid/lsm.c | 8 +++- security/security.c | 74 ++++++++++++++++++++++++----- security/selinux/hooks.c | 8 +++- security/smack/smack_lsm.c | 7 ++- security/tomoyo/tomoyo.c | 8 +++- security/yama/yama_lsm.c | 7 ++- 22 files changed, 265 insertions(+), 60 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 82b7c1116a85..418a485af114 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -11,6 +11,7 @@ #include #include +#include #include #include @@ -65,8 +66,9 @@ struct audit_field { kuid_t uid; kgid_t gid; struct { + bool lsm_isset; char *lsm_str; - void *lsm_rule; + void *lsm_rules[LSMBLOB_ENTRIES]; }; }; u32 op; diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h index afd3b16875b0..c61a16f0a5bc 100644 --- a/include/linux/lsm_hooks.h +++ b/include/linux/lsm_hooks.h @@ -1570,6 +1570,14 @@ struct security_hook_heads { #undef LSM_HOOK } __randomize_layout; +/* + * Information that identifies a security module. + */ +struct lsm_id { + const char *lsm; /* Name of the LSM */ + int slot; /* Slot in lsmblob if one is allocated */ +}; + /* * Security module hook list structure. * For use with generic list macros for common operations. @@ -1578,7 +1586,7 @@ struct security_hook_list { struct hlist_node list; struct hlist_head *head; union security_list_options hook; - char *lsm; + struct lsm_id *lsmid; } __randomize_layout; /* @@ -1614,7 +1622,7 @@ extern struct security_hook_heads security_hook_heads; extern char *lsm_names; extern void security_add_hooks(struct security_hook_list *hooks, int count, - char *lsm); + struct lsm_id *lsmid); #define LSM_FLAG_LEGACY_MAJOR BIT(0) #define LSM_FLAG_EXCLUSIVE BIT(1) diff --git a/include/linux/security.h b/include/linux/security.h index 24eda04221e9..7655bfce4b96 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -133,6 +133,65 @@ enum lockdown_reason { extern const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX+1]; +/* + * Data exported by the security modules + * + * Any LSM that provides secid or secctx based hooks must be included. + */ +#define LSMBLOB_ENTRIES ( \ + (IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \ + (IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \ + (IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \ + (IS_ENABLED(CONFIG_BPF_LSM) ? 1 : 0)) + +struct lsmblob { + u32 secid[LSMBLOB_ENTRIES]; +}; + +#define LSMBLOB_INVALID -1 /* Not a valid LSM slot number */ +#define LSMBLOB_NEEDED -2 /* Slot requested on initialization */ +#define LSMBLOB_NOT_NEEDED -3 /* Slot not requested */ + +/** + * lsmblob_init - initialize an lsmblob structure + * @blob: Pointer to the data to initialize + * @secid: The initial secid value + * + * Set all secid for all modules to the specified value. + */ +static inline void lsmblob_init(struct lsmblob *blob, u32 secid) +{ + int i; + + for (i = 0; i < LSMBLOB_ENTRIES; i++) + blob->secid[i] = secid; +} + +/** + * lsmblob_is_set - report if there is an value in the lsmblob + * @blob: Pointer to the exported LSM data + * + * Returns true if there is a secid set, false otherwise + */ +static inline bool lsmblob_is_set(struct lsmblob *blob) +{ + struct lsmblob empty = {}; + + return !!memcmp(blob, &empty, sizeof(*blob)); +} + +/** + * lsmblob_equal - report if the two lsmblob's are equal + * @bloba: Pointer to one LSM data + * @blobb: Pointer to the other LSM data + * + * Returns true if all entries in the two are equal, false otherwise + */ +static inline bool lsmblob_equal(struct lsmblob *bloba, struct lsmblob *blobb) +{ + return !memcmp(bloba, blobb, sizeof(*bloba)); +} + /* These functions are in security/commoncap.c */ extern int cap_capable(const struct cred *cred, struct user_namespace *ns, int cap, unsigned int opts); @@ -1881,8 +1940,8 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer) #ifdef CONFIG_SECURITY int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule); int security_audit_rule_known(struct audit_krule *krule); -int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule); -void security_audit_rule_free(void *lsmrule); +int security_audit_rule_match(u32 secid, u32 field, u32 op, void **lsmrule); +void security_audit_rule_free(void **lsmrule); #else @@ -1898,12 +1957,12 @@ static inline int security_audit_rule_known(struct audit_krule *krule) } static inline int security_audit_rule_match(u32 secid, u32 field, u32 op, - void *lsmrule) + void **lsmrule) { return 0; } -static inline void security_audit_rule_free(void *lsmrule) +static inline void security_audit_rule_free(void **lsmrule) { } #endif /* CONFIG_SECURITY */ diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index db2c6b59dfc3..a2340e81cfa7 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -74,7 +74,7 @@ static void audit_free_lsm_field(struct audit_field *f) case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: kfree(f->lsm_str); - security_audit_rule_free(f->lsm_rule); + security_audit_rule_free(f->lsm_rules); } } @@ -519,9 +519,10 @@ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, goto exit_free; } entry->rule.buflen += f_val; + f->lsm_isset = true; f->lsm_str = str; err = security_audit_rule_init(f->type, f->op, str, - (void **)&f->lsm_rule); + f->lsm_rules); /* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (err == -EINVAL) { @@ -774,7 +775,7 @@ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) return 0; } -/* Duplicate LSM field information. The lsm_rule is opaque, so must be +/* Duplicate LSM field information. The lsm_rules is opaque, so must be * re-initialized. */ static inline int audit_dupe_lsm_field(struct audit_field *df, struct audit_field *sf) @@ -788,9 +789,9 @@ static inline int audit_dupe_lsm_field(struct audit_field *df, return -ENOMEM; df->lsm_str = lsm_str; - /* our own (refreshed) copy of lsm_rule */ + /* our own (refreshed) copy of lsm_rules */ ret = security_audit_rule_init(df->type, df->op, df->lsm_str, - (void **)&df->lsm_rule); + df->lsm_rules); /* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (ret == -EINVAL) { @@ -842,7 +843,7 @@ struct audit_entry *audit_dupe_rule(struct audit_krule *old) new->tree = old->tree; memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); - /* deep copy this information, updating the lsm_rule fields, because + /* deep copy this information, updating the lsm_rules fields, because * the originals will all be freed when the old rule is freed. */ for (i = 0; i < fcount; i++) { switch (new->fields[i].type) { @@ -1358,11 +1359,12 @@ int audit_filter(int msgtype, unsigned int listtype) case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: - if (f->lsm_rule) { + if (f->lsm_isset) { security_task_getsecid_subj(current, &sid); result = security_audit_rule_match(sid, - f->type, f->op, f->lsm_rule); + f->type, f->op, + f->lsm_rules); } break; case AUDIT_EXE: @@ -1389,7 +1391,7 @@ int audit_filter(int msgtype, unsigned int listtype) return ret; } -static int update_lsm_rule(struct audit_krule *r) +static int update_lsm_rules(struct audit_krule *r) { struct audit_entry *entry = container_of(r, struct audit_entry, rule); struct audit_entry *nentry; @@ -1421,7 +1423,7 @@ static int update_lsm_rule(struct audit_krule *r) return err; } -/* This function will re-initialize the lsm_rule field of all applicable rules. +/* This function will re-initialize the lsm_rules field of all applicable rules. * It will traverse the filter lists serarching for rules that contain LSM * specific filter fields. When such a rule is found, it is copied, the * LSM field is re-initialized, and the old rule is replaced with the @@ -1436,7 +1438,7 @@ int audit_update_lsm_rules(void) for (i = 0; i < AUDIT_NR_FILTERS; i++) { list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { - int res = update_lsm_rule(r); + int res = update_lsm_rules(r); if (!err) err = res; } diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 8dd73a64f921..acbd896f54a5 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -671,14 +671,13 @@ static int audit_filter_rules(struct task_struct *tsk, match for now to avoid losing information that may be wanted. An error message will also be logged upon error */ - if (f->lsm_rule) { + if (f->lsm_isset) { if (need_sid) { security_task_getsecid_subj(tsk, &sid); need_sid = 0; } result = security_audit_rule_match(sid, f->type, - f->op, - f->lsm_rule); + f->op, f->lsm_rules); } break; case AUDIT_OBJ_USER: @@ -688,21 +687,21 @@ static int audit_filter_rules(struct task_struct *tsk, case AUDIT_OBJ_LEV_HIGH: /* The above note for AUDIT_SUBJ_USER...AUDIT_SUBJ_CLR also applies here */ - if (f->lsm_rule) { + if (f->lsm_isset) { /* Find files that match */ if (name) { result = security_audit_rule_match( name->osid, f->type, f->op, - f->lsm_rule); + f->lsm_rules); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { if (security_audit_rule_match( n->osid, f->type, f->op, - f->lsm_rule)) { + f->lsm_rules)) { ++result; break; } @@ -713,7 +712,7 @@ static int audit_filter_rules(struct task_struct *tsk, break; if (security_audit_rule_match(ctx->ipc.osid, f->type, f->op, - f->lsm_rule)) + f->lsm_rules)) ++result; } break; diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c index 4113516fb62e..392e25940d1f 100644 --- a/security/apparmor/lsm.c +++ b/security/apparmor/lsm.c @@ -1161,6 +1161,11 @@ struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = { .lbs_sock = sizeof(struct aa_sk_ctx), }; +static struct lsm_id apparmor_lsmid __lsm_ro_after_init = { + .lsm = "apparmor", + .slot = LSMBLOB_NEEDED +}; + static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), @@ -1862,7 +1867,7 @@ static int __init apparmor_init(void) goto buffers_out; } security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks), - "apparmor"); + &apparmor_lsmid); /* Report that AppArmor successfully initialized */ apparmor_initialized = 1; diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c index e5971fa74fd7..7a58fe9ab8c4 100644 --- a/security/bpf/hooks.c +++ b/security/bpf/hooks.c @@ -15,9 +15,19 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(task_free, bpf_task_storage_free), }; +/* + * slot has to be LSMBLOB_NEEDED because some of the hooks + * supplied by this module require a slot. + */ +struct lsm_id bpf_lsmid __lsm_ro_after_init = { + .lsm = "bpf", + .slot = LSMBLOB_NEEDED +}; + static int __init bpf_lsm_init(void) { - security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf"); + security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), + &bpf_lsmid); pr_info("LSM support for eBPF active\n"); return 0; } diff --git a/security/commoncap.c b/security/commoncap.c index 3f810d37b71b..628685cf20e3 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -1443,6 +1443,11 @@ int cap_mmap_file(struct file *file, unsigned long reqprot, #ifdef CONFIG_SECURITY +static struct lsm_id capability_lsmid __lsm_ro_after_init = { + .lsm = "capability", + .slot = LSMBLOB_NOT_NEEDED +}; + static struct security_hook_list capability_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(capable, cap_capable), LSM_HOOK_INIT(settime, cap_settime), @@ -1467,7 +1472,7 @@ static struct security_hook_list capability_hooks[] __lsm_ro_after_init = { static int __init capability_init(void) { security_add_hooks(capability_hooks, ARRAY_SIZE(capability_hooks), - "capability"); + &capability_lsmid); return 0; } diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index fd5d46e511f1..5c40677e881c 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -80,7 +80,7 @@ struct ima_rule_entry { bool (*fowner_op)(kuid_t, kuid_t); /* uid_eq(), uid_gt(), uid_lt() */ int pcr; struct { - void *rule; /* LSM file metadata specific */ + void *rules[LSMBLOB_ENTRIES]; /* LSM file metadata specific */ char *args_p; /* audit value */ int type; /* audit type */ } lsm[MAX_LSM_RULES]; @@ -90,6 +90,22 @@ struct ima_rule_entry { struct ima_template_desc *template; }; +/** + * ima_lsm_isset - Is a rule set for any of the active security modules + * @rules: The set of IMA rules to check + * + * If a rule is set for any LSM return true, otherwise return false. + */ +static inline bool ima_lsm_isset(void *rules[]) +{ + int i; + + for (i = 0; i < LSMBLOB_ENTRIES; i++) + if (rules[i]) + return true; + return false; +} + /* * Without LSM specific knowledge, the default policy can only be * written in terms of .action, .func, .mask, .fsmagic, .uid, and .fowner @@ -335,9 +351,11 @@ static void ima_free_rule_opt_list(struct ima_rule_opt_list *opt_list) static void ima_lsm_free_rule(struct ima_rule_entry *entry) { int i; + int r; for (i = 0; i < MAX_LSM_RULES; i++) { - ima_filter_rule_free(entry->lsm[i].rule); + for (r = 0; r < LSMBLOB_ENTRIES; r++) + ima_filter_rule_free(entry->lsm[i].rules[r]); kfree(entry->lsm[i].args_p); } } @@ -388,8 +406,8 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry) ima_filter_rule_init(nentry->lsm[i].type, Audit_equal, nentry->lsm[i].args_p, - &nentry->lsm[i].rule); - if (!nentry->lsm[i].rule) + &nentry->lsm[i].rules[0]); + if (!ima_lsm_isset(nentry->lsm[i].rules)) pr_warn("rule for LSM \'%s\' is undefined\n", nentry->lsm[i].args_p); } @@ -578,7 +596,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, int rc = 0; u32 osid; - if (!rule->lsm[i].rule) { + if (!ima_lsm_isset(rule->lsm[i].rules)) { if (!rule->lsm[i].args_p) continue; else @@ -591,14 +609,14 @@ static bool ima_match_rules(struct ima_rule_entry *rule, security_inode_getsecid(inode, &osid); rc = ima_filter_rule_match(osid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rule); + rule->lsm[i].rules); break; case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: rc = ima_filter_rule_match(secid, rule->lsm[i].type, Audit_equal, - rule->lsm[i].rule); + rule->lsm[i].rules); break; default: break; @@ -994,7 +1012,7 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, { int result; - if (entry->lsm[lsm_rule].rule) + if (ima_lsm_isset(entry->lsm[lsm_rule].rules)) return -EINVAL; entry->lsm[lsm_rule].args_p = match_strdup(args); @@ -1004,8 +1022,8 @@ static int ima_lsm_rule_init(struct ima_rule_entry *entry, entry->lsm[lsm_rule].type = audit_type; result = ima_filter_rule_init(entry->lsm[lsm_rule].type, Audit_equal, entry->lsm[lsm_rule].args_p, - &entry->lsm[lsm_rule].rule); - if (!entry->lsm[lsm_rule].rule) { + &entry->lsm[lsm_rule].rules[0]); + if (!ima_lsm_isset(entry->lsm[lsm_rule].rules)) { pr_warn("rule for LSM \'%s\' is undefined\n", entry->lsm[lsm_rule].args_p); @@ -1812,7 +1830,7 @@ int ima_policy_show(struct seq_file *m, void *v) } for (i = 0; i < MAX_LSM_RULES; i++) { - if (entry->lsm[i].rule) { + if (ima_lsm_isset(entry->lsm[i].rules)) { switch (i) { case LSM_OBJ_USER: seq_printf(m, pt(Opt_obj_user), diff --git a/security/landlock/cred.c b/security/landlock/cred.c index 6725af24c684..56b121d65436 100644 --- a/security/landlock/cred.c +++ b/security/landlock/cred.c @@ -42,5 +42,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = { __init void landlock_add_cred_hooks(void) { security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks), - LANDLOCK_NAME); + &landlock_lsmid); } diff --git a/security/landlock/fs.c b/security/landlock/fs.c index 97b8e421f617..319e90e9290c 100644 --- a/security/landlock/fs.c +++ b/security/landlock/fs.c @@ -688,5 +688,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = { __init void landlock_add_fs_hooks(void) { security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks), - LANDLOCK_NAME); + &landlock_lsmid); } diff --git a/security/landlock/ptrace.c b/security/landlock/ptrace.c index f55b82446de2..54ccf55a077a 100644 --- a/security/landlock/ptrace.c +++ b/security/landlock/ptrace.c @@ -116,5 +116,5 @@ static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = { __init void landlock_add_ptrace_hooks(void) { security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks), - LANDLOCK_NAME); + &landlock_lsmid); } diff --git a/security/landlock/setup.c b/security/landlock/setup.c index f8e8e980454c..759e00b9436c 100644 --- a/security/landlock/setup.c +++ b/security/landlock/setup.c @@ -23,6 +23,11 @@ struct lsm_blob_sizes landlock_blob_sizes __lsm_ro_after_init = { .lbs_superblock = sizeof(struct landlock_superblock_security), }; +struct lsm_id landlock_lsmid __lsm_ro_after_init = { + .lsm = LANDLOCK_NAME, + .slot = LSMBLOB_NOT_NEEDED, +}; + static int __init landlock_init(void) { landlock_add_cred_hooks(); diff --git a/security/landlock/setup.h b/security/landlock/setup.h index 1daffab1ab4b..38bce5b172dc 100644 --- a/security/landlock/setup.h +++ b/security/landlock/setup.h @@ -14,5 +14,6 @@ extern bool landlock_initialized; extern struct lsm_blob_sizes landlock_blob_sizes; +extern struct lsm_id landlock_lsmid; #endif /* _SECURITY_LANDLOCK_SETUP_H */ diff --git a/security/loadpin/loadpin.c b/security/loadpin/loadpin.c index b12f7d986b1e..b569f3bc170b 100644 --- a/security/loadpin/loadpin.c +++ b/security/loadpin/loadpin.c @@ -192,6 +192,11 @@ static int loadpin_load_data(enum kernel_load_data_id id, bool contents) return loadpin_read_file(NULL, (enum kernel_read_file_id) id, contents); } +static struct lsm_id loadpin_lsmid __lsm_ro_after_init = { + .lsm = "loadpin", + .slot = LSMBLOB_NOT_NEEDED +}; + static struct security_hook_list loadpin_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(sb_free_security, loadpin_sb_free_security), LSM_HOOK_INIT(kernel_read_file, loadpin_read_file), @@ -239,7 +244,8 @@ static int __init loadpin_init(void) pr_info("ready to pin (currently %senforcing)\n", enforce ? "" : "not "); parse_exclude(); - security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), "loadpin"); + security_add_hooks(loadpin_hooks, ARRAY_SIZE(loadpin_hooks), + &loadpin_lsmid); return 0; } diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index 87cbdc64d272..4e24ea3f7b7e 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -75,6 +75,11 @@ static struct security_hook_list lockdown_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(locked_down, lockdown_is_locked_down), }; +static struct lsm_id lockdown_lsmid __lsm_ro_after_init = { + .lsm = "lockdown", + .slot = LSMBLOB_NOT_NEEDED +}; + static int __init lockdown_lsm_init(void) { #if defined(CONFIG_LOCK_DOWN_KERNEL_FORCE_INTEGRITY) @@ -83,7 +88,7 @@ static int __init lockdown_lsm_init(void) lock_kernel_down("Kernel configuration", LOCKDOWN_CONFIDENTIALITY_MAX); #endif security_add_hooks(lockdown_hooks, ARRAY_SIZE(lockdown_hooks), - "lockdown"); + &lockdown_lsmid); return 0; } diff --git a/security/safesetid/lsm.c b/security/safesetid/lsm.c index 963f4ad9cb66..0c368950dc14 100644 --- a/security/safesetid/lsm.c +++ b/security/safesetid/lsm.c @@ -241,6 +241,11 @@ static int safesetid_task_fix_setgid(struct cred *new, return -EACCES; } +static struct lsm_id safesetid_lsmid __lsm_ro_after_init = { + .lsm = "safesetid", + .slot = LSMBLOB_NOT_NEEDED +}; + static struct security_hook_list safesetid_security_hooks[] = { LSM_HOOK_INIT(task_fix_setuid, safesetid_task_fix_setuid), LSM_HOOK_INIT(task_fix_setgid, safesetid_task_fix_setgid), @@ -250,7 +255,8 @@ static struct security_hook_list safesetid_security_hooks[] = { static int __init safesetid_security_init(void) { security_add_hooks(safesetid_security_hooks, - ARRAY_SIZE(safesetid_security_hooks), "safesetid"); + ARRAY_SIZE(safesetid_security_hooks), + &safesetid_lsmid); /* Report that SafeSetID successfully initialized */ safesetid_initialized = 1; diff --git a/security/security.c b/security/security.c index 335c313a668d..5f1b281511f2 100644 --- a/security/security.c +++ b/security/security.c @@ -344,6 +344,7 @@ static void __init ordered_lsm_init(void) init_debug("sock blob size = %d\n", blob_sizes.lbs_sock); init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock); init_debug("task blob size = %d\n", blob_sizes.lbs_task); + init_debug("lsmblob size = %zu\n", sizeof(struct lsmblob)); /* * Create any kmem_caches needed for blobs @@ -471,21 +472,38 @@ static int lsm_append(const char *new, char **result) return 0; } +/* + * Current index to use while initializing the lsmblob secid list. + */ +static int lsm_slot __lsm_ro_after_init; + /** * security_add_hooks - Add a modules hooks to the hook lists. * @hooks: the hooks to add * @count: the number of hooks to add - * @lsm: the name of the security module + * @lsmid: the identification information for the security module * * Each LSM has to register its hooks with the infrastructure. + * If the LSM is using hooks that export secids allocate a slot + * for it in the lsmblob. */ void __init security_add_hooks(struct security_hook_list *hooks, int count, - char *lsm) + struct lsm_id *lsmid) { int i; + WARN_ON(!lsmid->slot || !lsmid->lsm); + + if (lsmid->slot == LSMBLOB_NEEDED) { + if (lsm_slot >= LSMBLOB_ENTRIES) + panic("%s Too many LSMs registered.\n", __func__); + lsmid->slot = lsm_slot++; + init_debug("%s assigned lsmblob slot %d\n", lsmid->lsm, + lsmid->slot); + } + for (i = 0; i < count; i++) { - hooks[i].lsm = lsm; + hooks[i].lsmid = lsmid; hlist_add_tail_rcu(&hooks[i].list, hooks[i].head); } @@ -494,7 +512,7 @@ void __init security_add_hooks(struct security_hook_list *hooks, int count, * and fix this up afterwards. */ if (slab_is_available()) { - if (lsm_append(lsm, &lsm_names) < 0) + if (lsm_append(lsmid->lsm, &lsm_names) < 0) panic("%s - Cannot get early memory.\n", __func__); } } @@ -2070,7 +2088,7 @@ int security_getprocattr(struct task_struct *p, const char *lsm, char *name, struct security_hook_list *hp; hlist_for_each_entry(hp, &security_hook_heads.getprocattr, list) { - if (lsm != NULL && strcmp(lsm, hp->lsm)) + if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm)) continue; return hp->hook.getprocattr(p, name, value); } @@ -2083,7 +2101,7 @@ int security_setprocattr(const char *lsm, const char *name, void *value, struct security_hook_list *hp; hlist_for_each_entry(hp, &security_hook_heads.setprocattr, list) { - if (lsm != NULL && strcmp(lsm, hp->lsm)) + if (lsm != NULL && strcmp(lsm, hp->lsmid->lsm)) continue; return hp->hook.setprocattr(name, value, size); } @@ -2576,7 +2594,24 @@ int security_key_getsecurity(struct key *key, char **_buffer) int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule) { - return call_int_hook(audit_rule_init, 0, field, op, rulestr, lsmrule); + struct security_hook_list *hp; + bool one_is_good = false; + int rc = 0; + int trc; + + hlist_for_each_entry(hp, &security_hook_heads.audit_rule_init, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + trc = hp->hook.audit_rule_init(field, op, rulestr, + &lsmrule[hp->lsmid->slot]); + if (trc == 0) + one_is_good = true; + else + rc = trc; + } + if (one_is_good) + return 0; + return rc; } int security_audit_rule_known(struct audit_krule *krule) @@ -2584,14 +2619,31 @@ int security_audit_rule_known(struct audit_krule *krule) return call_int_hook(audit_rule_known, 0, krule); } -void security_audit_rule_free(void *lsmrule) +void security_audit_rule_free(void **lsmrule) { - call_void_hook(audit_rule_free, lsmrule); + struct security_hook_list *hp; + + hlist_for_each_entry(hp, &security_hook_heads.audit_rule_free, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + hp->hook.audit_rule_free(lsmrule[hp->lsmid->slot]); + } } -int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) +int security_audit_rule_match(u32 secid, u32 field, u32 op, void **lsmrule) { - return call_int_hook(audit_rule_match, 0, secid, field, op, lsmrule); + struct security_hook_list *hp; + int rc; + + hlist_for_each_entry(hp, &security_hook_heads.audit_rule_match, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + rc = hp->hook.audit_rule_match(secid, field, op, + &lsmrule[hp->lsmid->slot]); + if (rc) + return rc; + } + return 0; } #endif /* CONFIG_AUDIT */ diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index e2c4a1fd952f..f84b6c274a10 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -7101,6 +7101,11 @@ static int selinux_perf_event_write(struct perf_event *event) } #endif +static struct lsm_id selinux_lsmid __lsm_ro_after_init = { + .lsm = "selinux", + .slot = LSMBLOB_NEEDED +}; + /* * IMPORTANT NOTE: When adding new hooks, please be careful to keep this order: * 1. any hooks that don't belong to (2.) or (3.) below, @@ -7414,7 +7419,8 @@ static __init int selinux_init(void) hashtab_cache_init(); - security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), "selinux"); + security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), + &selinux_lsmid); if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET)) panic("SELinux: Unable to register AVC netcache callback\n"); diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c index 1ee0bf1493f6..5c10ad27be37 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -4694,6 +4694,11 @@ struct lsm_blob_sizes smack_blob_sizes __lsm_ro_after_init = { .lbs_superblock = sizeof(struct superblock_smack), }; +static struct lsm_id smack_lsmid __lsm_ro_after_init = { + .lsm = "smack", + .slot = LSMBLOB_NEEDED +}; + static struct security_hook_list smack_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ptrace_access_check, smack_ptrace_access_check), LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme), @@ -4893,7 +4898,7 @@ static __init int smack_init(void) /* * Register with LSM */ - security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack"); + security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), &smack_lsmid); smack_enabled = 1; pr_info("Smack: Initializing.\n"); diff --git a/security/tomoyo/tomoyo.c b/security/tomoyo/tomoyo.c index b6a31901f289..e8f6bb9782c1 100644 --- a/security/tomoyo/tomoyo.c +++ b/security/tomoyo/tomoyo.c @@ -521,6 +521,11 @@ static void tomoyo_task_free(struct task_struct *task) } } +static struct lsm_id tomoyo_lsmid __lsm_ro_after_init = { + .lsm = "tomoyo", + .slot = LSMBLOB_NOT_NEEDED +}; + /* * tomoyo_security_ops is a "struct security_operations" which is used for * registering TOMOYO. @@ -573,7 +578,8 @@ static int __init tomoyo_init(void) struct tomoyo_task *s = tomoyo_task(current); /* register ourselves with the security framework */ - security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), "tomoyo"); + security_add_hooks(tomoyo_hooks, ARRAY_SIZE(tomoyo_hooks), + &tomoyo_lsmid); pr_info("TOMOYO Linux initialized\n"); s->domain_info = &tomoyo_kernel_domain; atomic_inc(&tomoyo_kernel_domain.users); diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index 06e226166aab..a9639ea541f7 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -421,6 +421,11 @@ static int yama_ptrace_traceme(struct task_struct *parent) return rc; } +static struct lsm_id yama_lsmid __lsm_ro_after_init = { + .lsm = "yama", + .slot = LSMBLOB_NOT_NEEDED +}; + static struct security_hook_list yama_hooks[] __lsm_ro_after_init = { LSM_HOOK_INIT(ptrace_access_check, yama_ptrace_access_check), LSM_HOOK_INIT(ptrace_traceme, yama_ptrace_traceme), @@ -477,7 +482,7 @@ static inline void yama_init_sysctl(void) { } static int __init yama_init(void) { pr_info("Yama: becoming mindful.\n"); - security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), "yama"); + security_add_hooks(yama_hooks, ARRAY_SIZE(yama_hooks), &yama_lsmid); yama_init_sysctl(); return 0; }