From patchwork Tue Dec 24 23:59:17 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 11309797 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4231115AB for ; Wed, 25 Dec 2019 00:00:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 20D6720679 for ; Wed, 25 Dec 2019 00:00:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=yahoo.com header.i=@yahoo.com header.b="Sz+WjRQI" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726237AbfLYAAI (ORCPT ); Tue, 24 Dec 2019 19:00:08 -0500 Received: from sonic306-28.consmr.mail.ne1.yahoo.com ([66.163.189.90]:33220 "EHLO sonic306-28.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726251AbfLYAAI (ORCPT ); Tue, 24 Dec 2019 19:00:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1577232006; bh=a7gP5ojhPalneWu5RFlKAGhZcG4nFIXdq/EolVgpW6k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject; b=Sz+WjRQIH0MRF3CHuLaMoaM2PiVFjkguuxujqqskSb9mCIK3jeVWZnXtD01CFVeaM5DmSZ2GsOzyuj11koxHkQJr9IwyxLxPd/SE4svKF2FW0e4H56EzizwljrikBLKP4bVI/sG0rYKnPewz5nXNkYor6vgSGcpGlexjrIjFsAEzrHlmBlmIAPEehmj6WtCOpLsyDaO4LTZzwvkKnAQNgdz7RKIqFTyi2fX6yNuC/pFDF4uaxgJur1VzebtRT7ACFrQMeOCWAhzi7gVxmTVNf3aTDT5zLyJCTS/HZnOQ3BtPkfkvSDW9AD0tFzvK2vOL39Paan8NIX8GwAQyCzApvg== X-YMail-OSG: ACK7uaAVM1nypnky.dl0Pt11Cv6Y_qA_GQyuQwUuK.rB_SE653A3esubSVSCrzO 4ViwXDp0eeQH3iCt9uZkk9Uum4OAeHpXWAXXMZ4YvuSGOIpua1tbl_gAjrdn1lDFnQH4P_CqMQ8c YLDtBCnADc2fIEuB.2R7q2Li5EQkUClOHzEsP5V7l18BGOAXFih4kkSj9kyqJtF9tNRiB8YdjLVS 9MnMRW5jj9kF4gcrxtJDKxLCM_90UARBqedYw8yQc2yjFLLdw0DY9w4b3NB8nEo9NSo8jLYSQrUl 8BYNVCFFP.QyyqGkG_y1DvytFZzDGliBY1RUShZqDRogP7eFLu3OVtYaLHWj0BZcZstGg03SLjZs 5Vlb7jbzVBwxi3laFNgNvF8EsFnEjh0ihu.5tptYkTv9vwCbRC9eAO1_GL6JqxEQX7eh_dVGfsz7 ZxCBdftc.VFGaDPs8v7JRoh7rR7T2wcoAzD36EXWu2SgYJ7uzzzq.VISPk60YsyG.wCER1Ou7OG5 22acSUTlrXystf7dW8cDYJTWwAnDc3CTAtKEK5njHJJ4QrRo5o1DPfWS9pd_S2QXvL7yir_mh2K. aLZQUECoi6sW9YN7FAKm.jMFZQlLI72Rir7XuOO0Qmk_T_t2M_Slo_f5EiicB.2CyDg7W2v5Iolw UIL58GAOYqJfNzNSR0SG_t.cefTJzWveh6e7qoObauIGPr8pqhdZ82r5zbNOUsh9SnLyr210OMNS FY3W94pwu4ZELjWRuF49kZ_VwC7xNqBWTRQSLALca0nvH0W9cjVh3B1V_XYgvXNAmK3vrwJj7kyR EK3xJknJwwl.8gcESjyI4QK3RczSiFpa2pnCct1a3TE_62WHXhEy5GnuN34GhIU.kGq..dGW1FLu NJ371JvxXZ3l95ErsXo9Lt2x9K84Qyc7z8m6kic75N00Ia3g_9cd76BklQZMthDopXgU0Gtl4Hdq rPcAqFlXTwyT9tHujX6jmmzVrH_Gt2r9LCiZ5N.owqBSSC88vj4SVgWtali9UFGYbe4nBtTK9VHk 7T.1UvcqaqGJsTCylbNl7TTV2uA6EhmrCKkwE_bmZOK_a4kPOD6lu4.g1mH.I31SnpPVTm8oOSTw isBRqAmeSDAX51rodub2E5Y6MbxZ6StpFh7MC02.NMmZuvErpVw5GLYBiDHfuDG17vrMdjNfmOlk RbST5GWRYNNHFbAHLj_gPIQT.PTH.5gyugYmXSWr_KjTtwfyw.ObRUGFIls8oBnutvSnwXIjH1gE qf7.DCPWiiutUnMql_NspFaWS0kp4kloxDuijcN4h7PbKdyz2W.vyJX90MKou.sCJzK2JE7eGn0W MhoadukFE5HwX4F_rbIby8u9n17yD2oBc7cDyodFcpl6rRUZEe3TZuaeixa3TGdddZpK5WSl.1H7 eGrkPp3Y_96VRgYyzgIzw1.k5RZTcWuY0XukzN7uI_5GhDNqr3Kgx_bTH71ZljZzrcAZmAWI2joE - Received: from sonic.gate.mail.ne1.yahoo.com by sonic306.consmr.mail.ne1.yahoo.com with HTTP; Wed, 25 Dec 2019 00:00:06 +0000 Received: by smtp422.mail.ne1.yahoo.com (Oath Hermes SMTP Server) with ESMTPA ID 001a47d8cb2e601c953a3f6dae1f6bf1; Wed, 25 Dec 2019 00:00:03 +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, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, sds@tycho.nsa.gov Subject: [PATCH v13 03/25] LSM: Use lsmblob in security_audit_rule_match Date: Tue, 24 Dec 2019 15:59:17 -0800 Message-Id: <20191224235939.7483-4-casey@schaufler-ca.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191224235939.7483-1-casey@schaufler-ca.com> References: <20191224235939.7483-1-casey@schaufler-ca.com> MIME-Version: 1.0 Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: Change the secid parameter of security_audit_rule_match to a lsmblob structure pointer. Pass the entry from the lsmblob structure for the approprite slot to the LSM hook. Change the users of security_audit_rule_match to use the lsmblob instead of a u32. In some cases this requires a temporary conversion using lsmblob_init() that will go away when other interfaces get converted. Reviewed-by: Kees Cook Reviewed-by: John Johansen Acked-by: Stephen Smalley Signed-off-by: Casey Schaufler --- include/linux/security.h | 7 ++++--- kernel/auditfilter.c | 7 +++++-- kernel/auditsc.c | 14 ++++++++++---- security/integrity/ima/ima.h | 4 ++-- security/integrity/ima/ima_policy.c | 7 +++++-- security/security.c | 18 +++++++++++++++--- 6 files changed, 41 insertions(+), 16 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index b74dc70088ca..9c6dbe248eaf 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1837,7 +1837,8 @@ 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); +int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, + void *lsmrule); void security_audit_rule_free(void *lsmrule); #else @@ -1853,8 +1854,8 @@ static inline int security_audit_rule_known(struct audit_krule *krule) return 0; } -static inline int security_audit_rule_match(u32 secid, u32 field, u32 op, - void *lsmrule) +static inline int security_audit_rule_match(struct lsmblob *blob, u32 field, + u32 op, void *lsmrule) { return 0; } diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index b0126e9c0743..356db1dd276c 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1325,6 +1325,7 @@ int audit_filter(int msgtype, unsigned int listtype) struct audit_field *f = &e->rule.fields[i]; pid_t pid; u32 sid; + struct lsmblob blob; switch (f->type) { case AUDIT_PID: @@ -1355,8 +1356,10 @@ int audit_filter(int msgtype, unsigned int listtype) case AUDIT_SUBJ_CLR: if (f->lsm_rule) { security_task_getsecid(current, &sid); - result = security_audit_rule_match(sid, - f->type, f->op, f->lsm_rule); + lsmblob_init(&blob, sid); + result = security_audit_rule_match( + &blob, f->type, + f->op, f->lsm_rule); } break; case AUDIT_EXE: diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 4effe01ebbe2..7566e5b1c419 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -445,6 +445,7 @@ static int audit_filter_rules(struct task_struct *tsk, const struct cred *cred; int i, need_sid = 1; u32 sid; + struct lsmblob blob; unsigned int sessionid; cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation); @@ -643,7 +644,9 @@ static int audit_filter_rules(struct task_struct *tsk, security_task_getsecid(tsk, &sid); need_sid = 0; } - result = security_audit_rule_match(sid, f->type, + lsmblob_init(&blob, sid); + result = security_audit_rule_match(&blob, + f->type, f->op, f->lsm_rule); } @@ -658,15 +661,17 @@ static int audit_filter_rules(struct task_struct *tsk, if (f->lsm_rule) { /* Find files that match */ if (name) { + lsmblob_init(&blob, name->osid); result = security_audit_rule_match( - name->osid, + &blob, f->type, f->op, f->lsm_rule); } else if (ctx) { list_for_each_entry(n, &ctx->names_list, list) { + lsmblob_init(&blob, n->osid); if (security_audit_rule_match( - n->osid, + &blob, f->type, f->op, f->lsm_rule)) { @@ -678,7 +683,8 @@ static int audit_filter_rules(struct task_struct *tsk, /* Find ipc objects that match */ if (!ctx || ctx->type != AUDIT_IPC) break; - if (security_audit_rule_match(ctx->ipc.osid, + lsmblob_init(&blob, ctx->ipc.osid); + if (security_audit_rule_match(&blob, f->type, f->op, f->lsm_rule)) ++result; diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h index df4ca482fb53..d95b0ece7434 100644 --- a/security/integrity/ima/ima.h +++ b/security/integrity/ima/ima.h @@ -381,8 +381,8 @@ static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr, return -EINVAL; } -static inline int security_filter_rule_match(u32 secid, u32 field, u32 op, - void *lsmrule) +static inline int security_filter_rule_match(struct lsmblob *blob, u32 field, + u32 op, void *lsmrule) { return -EINVAL; } diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c index ef8dfd47c7e3..68fe533f8a4f 100644 --- a/security/integrity/ima/ima_policy.c +++ b/security/integrity/ima/ima_policy.c @@ -414,6 +414,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, for (i = 0; i < MAX_LSM_RULES; i++) { int rc = 0; u32 osid; + struct lsmblob blob; if (!rule->lsm[i].rule) continue; @@ -423,7 +424,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, case LSM_OBJ_ROLE: case LSM_OBJ_TYPE: security_inode_getsecid(inode, &osid); - rc = security_filter_rule_match(osid, + lsmblob_init(&blob, osid); + rc = security_filter_rule_match(&blob, rule->lsm[i].type, Audit_equal, rule->lsm[i].rule); @@ -431,7 +433,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode, case LSM_SUBJ_USER: case LSM_SUBJ_ROLE: case LSM_SUBJ_TYPE: - rc = security_filter_rule_match(secid, + lsmblob_init(&blob, secid); + rc = security_filter_rule_match(&blob, rule->lsm[i].type, Audit_equal, rule->lsm[i].rule); diff --git a/security/security.c b/security/security.c index 87fc70f77660..12e1e6223233 100644 --- a/security/security.c +++ b/security/security.c @@ -439,7 +439,7 @@ static int lsm_append(const char *new, char **result) /* * Current index to use while initializing the lsmblob secid list. */ -static int lsm_slot __initdata; +static int lsm_slot __lsm_ro_after_init; /** * security_add_hooks - Add a modules hooks to the hook lists. @@ -2412,9 +2412,21 @@ void security_audit_rule_free(void *lsmrule) call_void_hook(audit_rule_free, lsmrule); } -int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule) +int security_audit_rule_match(struct lsmblob *blob, 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(blob->secid[hp->lsmid->slot], + field, op, lsmrule); + if (rc != 0) + return rc; + } + return 0; } #endif /* CONFIG_AUDIT */