From patchwork Wed Nov 24 01:43:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Casey Schaufler X-Patchwork-Id: 12635729 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60441C433EF for ; Wed, 24 Nov 2021 01:58:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239489AbhKXCBJ (ORCPT ); Tue, 23 Nov 2021 21:01:09 -0500 Received: from sonic315-27.consmr.mail.ne1.yahoo.com ([66.163.190.153]:39843 "EHLO sonic315-27.consmr.mail.ne1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239560AbhKXCBH (ORCPT ); Tue, 23 Nov 2021 21:01:07 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1637719078; bh=SaFxVnogzJCq2k92oJIkP1y5i7oZ2jbyQ0ExTgBRwoE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From:Subject:Reply-To; b=VsuByuzNiePh+HXwk4zu3+KvcANeHpivUTWC1xyHAY+lo2dwWoNUQs/tu6/cjZfQ1PtPpF9KltZHdUgbXYz1748VYS99Sro7QOOT7gsuIPrh0pOKMdbwzMIptVpLmfYhxzXJXIRKk/405NTu1Yt1TnWeuldcIQaGJVUxFsh2WH+hYcF8Px6T4JwKIwHGZGMxNnAhQLtqv+ukB+jS19DzA39VerHwTr9Fu+iPrPUEl1i/7tKNSLRkaOuhRDXEcuH3u91BarNkq1WrkqhpUwn0Mc4HdnAROF+rPTP3k74VON7MwhjZpeBQKhg+FzxY5VmxEIkKjljpB5aiH0XUNl1oZQ== X-SONIC-DKIM-SIGN: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s2048; t=1637719078; bh=3SwvkznlKQgH48hA1kOckf3NZlCA5/C9CZBFkyMOy6v=; h=X-Sonic-MF:From:To:Subject:Date:From:Subject; b=FePZWN/OsHPokmVZBDGiOrzn6O19kNuk2jL8LcjwasiZxdHENSLctLZ2phVgm1D+ZC/IGR2oFh4/svuGH4oX7Ef2CZXZNC7vmyv5Y7/tYbODPJlFBPWeUapBCiXVMMsBk0f3wJ2QOBENLahVK3FAquPXhskj+zVVbKlPSW6jQXE/Ev/7ak6G7Q4PVQr9m8LfDCdV33Z6wVuzpnlRc+oAjGqIfd5SfYTbgX9Jp/OH9g8KSJcSbZ9dSfvd/gsEqK90sFa8RlyVS9vixI/3DnsvV9s/WrUeAXmN4XHqY5WLHOlztwOiP4MMd5eG6UBR5fy4lz/x+/Nx4fl4IG+DEylZxw== X-YMail-OSG: DpqoLzYVM1kTH2C3DkX_NfQ0Q2.fl.Wcgi.cFGyJxEJX1ziXmkMSOh.KtBB5hD1 kWDDE.R_hSORliPWQGXm1JQ0J1Hsc18gDEJo3xMjOgGandhtyUTUCAzn9mpLpyQhFxV5eTLKz89o deGHoPYqGo.7r0IzhhX.QRNEnfCDJhnk0IRn448uPv9Bv.EP7ymDw_mi5mAcLC0.DKmhN6HaTW2O DOWUjx5gHm1lYieCqCqInwopI29.NCepjoCrjDUeSVqH6md.wQ2bjUAYNy0Oqo6iO9QsHSXw1_Wb PJfjxrXqta5j8knBOBLsHduTB787idqNZYoQW96QgN2h5CkIuzbW4ckVKCTyaV3ow.._KvXD4v27 E_6MS5pCVt0zoVn6_k8Ungxtgr2bMiGNowK__FaMJo7w5ygMa_tDLhZ0CVE6h.t6xz0qseVRtF8g lG7yvt2W_Vg.d30buJoConrOhmXHnB9DA5bzmSMxczB0pVLUpH3oyKQZpepP5agQXJCTjuZw.9n. oK6gcaWcURF9Th8A3t9pqI3EZZzX7PCAeZ7de7Ienz52.NQeFqc.9NbCxUAakLzw0z9WxTDhUa5P 2iQRg1SWeGdgMDw_ht9uLh9ps0zcoz9KM.xWRhZcm9gOOtcwFxN2HcTpZE5Q5O1ik9lnI1nRjm2M YBVZ1mEqvDNKRfL6_E2ftc_sl5VCugjNvA59KQeE2WGzjpYoE32U4N99clhUwrBCpEiS6lIGtC.I t7OVdLy_lSSMilG74j3z_rO3YvPIP8ywQA.fqf.4iPRNttx0VTOLTtHLsqET5YW_8CRdpTuWJShU jP.LMxvCYAjvWmE2bSfurDsNFXKLE.LtcPFQUxH.e5ap7.pQX_vK7bDjexnJe9MXsf8XlOQUvi.i Q2.MxmITnCWYLe9hNjjM.KTxNnCorUJIxfYfXaW2kFGBaKH0SvdzRW3GXIaEHKhXOCOGDzddy_B9 kiM5kOJRIlfatsKI05UUEYg5UnAHpTr88Q6ct1.FOAfSKhQAMzYo0xrFQxyzKbdZizBmh0uQla29 zn7OfdRTpr.Jn33ws_iU1iHJSVAXh87f3AqmmX3vXeOcvVo1Idqt6vAn8BAExPvf_ieXUFFW9_3R jY0RXMulg6LV9lF1lpakD2IWhUZV5rFHxGY7oeZfcDOENdWAqkDeLqiBXppGRgSvnJhcUt.VnwEZ m1lmybg_uZUoAPn3xldZBnxVlw6aWzgdwfgqq0.xX.SXPNr6Temj84Uhrxj0sK50xNJ2GldIXPO4 tRHaBTvI6zT5Z5fSna6qYg85n7EQJC6cjD_fjWSRQbPUWz8kdJZUepO.XOQqP3H3BjhvylbBzwxd bBnlYesyvvUen1oeD8JJO4CRVDiQsPpR8iVHUk.4MnmVrJs6fRt4eUrD.gbnEui_TVxmX5KV_FHK bYo8nQFA_5Ea5KGGO9aW60wWcCke3NWc_wX3z5PUM0ZXpPuImRkHTqC6WX9QZT1K8QPTwUlCTAQS j3g50uxVESUxzQ5fWmW1UkvMhlbQnKYGBNKVOAQAZoKz3kRJ425dimnUbf0X8.euvV9tX5jBOwdT X7a4wixhG07q2XDncutx43ZXPRJ16HTANM2ElSBQ4Om_nNkxHTBTE1yjYA_NzP3QAMCNLWg3QD8h I5bgu1ALvNYSfr62wQPj0bAlLORM0U2ujlvc74RZ5BukLrJ1gBIt1k619px5JcAEabH3qWlysODC 3IgATvTe3_oOUiNUc2f.UqnNT3VUKLKA5f.OKokN.6J67uAi4KvS8HzYINTluwsozVn6spiZ1VLs D5uxAVEEKmKLyyNCJIGxcERzgRlA3XUNsyHectfKCo0IXsAq.ujERkmCY4kw0MIGTUIGLK5cz4L8 vQuSeKce2gotjmcWfyTUdRughH0cg7WRI1i0XhTIvJgdjFyb.TI_AnyaZAS__50ni6ebUrxE1KOW ny5YgFmWMUURCBanEWqlHpxsRh0q0AMOSwc1YNIQJdszxoDPb5tCrIifgbAxdcC71grkSlVzIzWg _4rSp3r1ryJ9BSTzQKhKIk_ZcR8M7fHQt3zS0v7c9wXeQOVbv8ZETijX4tVg_c3Aes9lT_MLiddf s4wRzeUjZ2jQNDtZX7u2DkCMefifHohXCcijElaAY0pa60iRcWAWRGsbXXU6yTZQWtq2VX8QlmWo dUPDPNj3JpS8KkbvqYhTcFrUd_RecAWDXQkq3NsmlQvmQO1WOfCPNG3Pn53QEmZg04smHhITMbXo SqSXmigbLrWvFcy2JA9fMwwjLld6W4y0LSIUDYp.h85dPr5pHMRg1vbwZdGEB2tX8zFo- X-Sonic-MF: Received: from sonic.gate.mail.ne1.yahoo.com by sonic315.consmr.mail.ne1.yahoo.com with HTTP; Wed, 24 Nov 2021 01:57:58 +0000 Received: by kubenode551.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID fc90a0548d4652347091e08d13a1c44d; Wed, 24 Nov 2021 01:57:55 +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, Stephen Smalley , linux-integrity@vger.kernel.org Subject: [PATCH v30 13/28] LSM: Use lsmblob in security_cred_getsecid Date: Tue, 23 Nov 2021 17:43:17 -0800 Message-Id: <20211124014332.36128-14-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20211124014332.36128-1-casey@schaufler-ca.com> References: <20211124014332.36128-1-casey@schaufler-ca.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Change the security_cred_getsecid() interface to fill in a lsmblob instead of a u32 secid. The associated data elements in the audit sub-system are changed from a secid to a lsmblob to accommodate multiple possible LSM audit users. Reviewed-by: Kees Cook Reviewed-by: John Johansen Acked-by: Stephen Smalley Acked-by: Paul Moore Signed-off-by: Casey Schaufler Cc: linux-integrity@vger.kernel.org Cc: linux-audit@redhat.com --- drivers/android/binder.c | 12 +---------- include/linux/security.h | 2 +- kernel/audit.c | 25 +++++++---------------- kernel/audit.h | 3 ++- kernel/auditsc.c | 33 +++++++++++-------------------- security/integrity/ima/ima_main.c | 8 ++++---- security/security.c | 12 ++++++++--- 7 files changed, 36 insertions(+), 59 deletions(-) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index 780c7e265f3a..2be77ae9ca52 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -2720,18 +2720,8 @@ static void binder_transaction(struct binder_proc *proc, if (target_node && target_node->txn_security_ctx) { struct lsmblob blob; size_t added_size; - u32 secid; - security_cred_getsecid(proc->cred, &secid); - /* - * Later in this patch set security_cred_getsecid() will - * provide a lsmblob instead of a secid. lsmblob_init - * is used to ensure that all the secids in the lsmblob - * get the value returned from security_cred_getsecid(), - * which means that the one expected by - * security_secid_to_secctx() will be set. - */ - lsmblob_init(&blob, secid); + security_cred_getsecid(proc->cred, &blob); ret = security_secid_to_secctx(&blob, &secctx, &secctx_sz); if (ret) { return_error = BR_FAILED_REPLY; diff --git a/include/linux/security.h b/include/linux/security.h index f324acc2c029..5271b2f4dfca 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -484,7 +484,7 @@ int security_cred_alloc_blank(struct cred *cred, gfp_t gfp); 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); +void security_cred_getsecid(const struct cred *c, struct lsmblob *blob); 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); diff --git a/kernel/audit.c b/kernel/audit.c index d92c7b894183..8ec64e6e8bc0 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -125,7 +125,7 @@ static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME; /* The identity of the user shutting down the audit system. */ static kuid_t audit_sig_uid = INVALID_UID; static pid_t audit_sig_pid = -1; -static u32 audit_sig_sid; +struct lsmblob audit_sig_lsm; /* Records can be lost in several ways: 0) [suppressed in audit_alloc] @@ -1441,29 +1441,21 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) } case AUDIT_SIGNAL_INFO: len = 0; - if (audit_sig_sid) { - struct lsmblob blob; - - /* - * lsmblob_init sets all values in the lsmblob - * to audit_sig_sid. This is temporary until - * audit_sig_sid is converted to a lsmblob, which - * happens later in this patch set. - */ - lsmblob_init(&blob, audit_sig_sid); - err = security_secid_to_secctx(&blob, &ctx, &len); + if (lsmblob_is_set(&audit_sig_lsm)) { + err = security_secid_to_secctx(&audit_sig_lsm, &ctx, + &len); if (err) return err; } sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); if (!sig_data) { - if (audit_sig_sid) + if (lsmblob_is_set(&audit_sig_lsm)) security_release_secctx(ctx, len); return -ENOMEM; } sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); sig_data->pid = audit_sig_pid; - if (audit_sig_sid) { + if (lsmblob_is_set(&audit_sig_lsm)) { memcpy(sig_data->ctx, ctx, len); security_release_secctx(ctx, len); } @@ -2352,7 +2344,6 @@ int audit_set_loginuid(kuid_t loginuid) int audit_signal_info(int sig, struct task_struct *t) { kuid_t uid = current_uid(), auid; - struct lsmblob blob; if (auditd_test_task(t) && (sig == SIGTERM || sig == SIGHUP || @@ -2363,9 +2354,7 @@ int audit_signal_info(int sig, struct task_struct *t) audit_sig_uid = auid; else audit_sig_uid = uid; - security_task_getsecid_subj(current, &blob); - /* scaffolding until audit_sig_sid is converted */ - audit_sig_sid = blob.secid[0]; + security_task_getsecid_subj(current, &audit_sig_lsm); } return audit_signal_info_syscall(t); diff --git a/kernel/audit.h b/kernel/audit.h index c4498090a5bd..527d4c4acb12 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -12,6 +12,7 @@ #include #include #include +#include #include #include #include // struct open_how @@ -143,7 +144,7 @@ struct audit_context { kuid_t target_auid; kuid_t target_uid; unsigned int target_sessionid; - u32 target_sid; + struct lsmblob target_lsm; char target_comm[TASK_COMM_LEN]; struct audit_tree_refs *trees, *first_trees; diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 3123c97d13b3..7d256fb2ec03 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -99,7 +99,7 @@ struct audit_aux_data_pids { kuid_t target_auid[AUDIT_AUX_PIDS]; kuid_t target_uid[AUDIT_AUX_PIDS]; unsigned int target_sessionid[AUDIT_AUX_PIDS]; - u32 target_sid[AUDIT_AUX_PIDS]; + struct lsmblob target_lsm[AUDIT_AUX_PIDS]; char target_comm[AUDIT_AUX_PIDS][TASK_COMM_LEN]; int pid_count; }; @@ -1009,7 +1009,7 @@ static void audit_reset_context(struct audit_context *ctx) ctx->target_pid = 0; ctx->target_auid = ctx->target_uid = KUIDT_INIT(0); ctx->target_sessionid = 0; - ctx->target_sid = 0; + lsmblob_init(&ctx->target_lsm, 0); ctx->target_comm[0] = '\0'; unroll_tree_refs(ctx, NULL, 0); WARN_ON(!list_empty(&ctx->killed_trees)); @@ -1107,14 +1107,14 @@ static inline void audit_free_context(struct audit_context *context) } static int audit_log_pid_context(struct audit_context *context, pid_t pid, - kuid_t auid, kuid_t uid, unsigned int sessionid, - u32 sid, char *comm) + kuid_t auid, kuid_t uid, + unsigned int sessionid, + struct lsmblob *blob, char *comm) { struct audit_buffer *ab; char *ctx = NULL; u32 len; int rc = 0; - struct lsmblob blob; ab = audit_log_start(context, GFP_KERNEL, AUDIT_OBJ_PID); if (!ab) @@ -1123,9 +1123,8 @@ static int audit_log_pid_context(struct audit_context *context, pid_t pid, audit_log_format(ab, "opid=%d oauid=%d ouid=%d oses=%d", pid, from_kuid(&init_user_ns, auid), from_kuid(&init_user_ns, uid), sessionid); - if (sid) { - lsmblob_init(&blob, sid); - if (security_secid_to_secctx(&blob, &ctx, &len)) { + if (lsmblob_is_set(blob)) { + if (security_secid_to_secctx(blob, &ctx, &len)) { audit_log_format(ab, " obj=(none)"); rc = 1; } else { @@ -1753,7 +1752,7 @@ static void audit_log_exit(void) axs->target_auid[i], axs->target_uid[i], axs->target_sessionid[i], - axs->target_sid[i], + &axs->target_lsm[i], axs->target_comm[i])) call_panic = 1; } @@ -1762,7 +1761,7 @@ static void audit_log_exit(void) audit_log_pid_context(context, context->target_pid, context->target_auid, context->target_uid, context->target_sessionid, - context->target_sid, context->target_comm)) + &context->target_lsm, context->target_comm)) call_panic = 1; if (context->pwd.dentry && context->pwd.mnt) { @@ -2698,15 +2697,12 @@ int __audit_sockaddr(int len, void *a) void __audit_ptrace(struct task_struct *t) { struct audit_context *context = audit_context(); - struct lsmblob blob; context->target_pid = task_tgid_nr(t); context->target_auid = audit_get_loginuid(t); context->target_uid = task_uid(t); context->target_sessionid = audit_get_sessionid(t); - security_task_getsecid_obj(t, &blob); - /* scaffolding - until target_sid is converted */ - context->target_sid = blob.secid[0]; + security_task_getsecid_obj(t, &context->target_lsm); memcpy(context->target_comm, t->comm, TASK_COMM_LEN); } @@ -2722,7 +2718,6 @@ int audit_signal_info_syscall(struct task_struct *t) struct audit_aux_data_pids *axp; struct audit_context *ctx = audit_context(); kuid_t t_uid = task_uid(t); - struct lsmblob blob; if (!audit_signals || audit_dummy_context()) return 0; @@ -2734,9 +2729,7 @@ int audit_signal_info_syscall(struct task_struct *t) ctx->target_auid = audit_get_loginuid(t); ctx->target_uid = t_uid; ctx->target_sessionid = audit_get_sessionid(t); - security_task_getsecid_obj(t, &blob); - /* scaffolding until target_sid is converted */ - ctx->target_sid = blob.secid[0]; + security_task_getsecid_obj(t, &ctx->target_lsm); memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN); return 0; } @@ -2757,9 +2750,7 @@ int audit_signal_info_syscall(struct task_struct *t) axp->target_auid[axp->pid_count] = audit_get_loginuid(t); axp->target_uid[axp->pid_count] = t_uid; axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t); - security_task_getsecid_obj(t, &blob); - /* scaffolding until target_sid is converted */ - axp->target_sid[axp->pid_count] = blob.secid[0]; + security_task_getsecid_obj(t, &axp->target_lsm[axp->pid_count]); memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN); axp->pid_count++; diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c index c327f93d3962..1a4f7b00253b 100644 --- a/security/integrity/ima/ima_main.c +++ b/security/integrity/ima/ima_main.c @@ -486,7 +486,6 @@ int ima_file_mprotect(struct vm_area_struct *vma, unsigned long prot) int ima_bprm_check(struct linux_binprm *bprm) { int ret; - u32 secid; struct lsmblob blob; security_task_getsecid_subj(current, &blob); @@ -496,9 +495,10 @@ int ima_bprm_check(struct linux_binprm *bprm) if (ret) return ret; - security_cred_getsecid(bprm->cred, &secid); - return process_measurement(bprm->file, bprm->cred, secid, NULL, 0, - MAY_EXEC, CREDS_CHECK); + security_cred_getsecid(bprm->cred, &blob); + /* scaffolding until process_measurement changes */ + return process_measurement(bprm->file, bprm->cred, blob.secid[0], + NULL, 0, MAY_EXEC, CREDS_CHECK); } /** diff --git a/security/security.c b/security/security.c index 54b5dbe63265..f7af2444fcc3 100644 --- a/security/security.c +++ b/security/security.c @@ -1800,10 +1800,16 @@ void security_transfer_creds(struct cred *new, const struct cred *old) call_void_hook(cred_transfer, new, old); } -void security_cred_getsecid(const struct cred *c, u32 *secid) +void security_cred_getsecid(const struct cred *c, struct lsmblob *blob) { - *secid = 0; - call_void_hook(cred_getsecid, c, secid); + struct security_hook_list *hp; + + lsmblob_init(blob, 0); + hlist_for_each_entry(hp, &security_hook_heads.cred_getsecid, list) { + if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot)) + continue; + hp->hook.cred_getsecid(c, &blob->secid[hp->lsmid->slot]); + } } EXPORT_SYMBOL(security_cred_getsecid);