[v29,12/28] LSM: Use lsmblob in security_cred_getsecid

Message ID	20210924175441.7943-13-casey@schaufler-ca.com (mailing list archive)
State	Superseded
Delegated to:	Paul Moore
Headers	show Return-Path: <selinux-owner@kernel.org> From: Casey Schaufler <casey@schaufler-ca.com> 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 <stephen.smalley.work@gmail.com>, linux-integrity@vger.kernel.org Subject: [PATCH v29 12/28] LSM: Use lsmblob in security_cred_getsecid Date: Fri, 24 Sep 2021 10:54:25 -0700 Message-Id: <20210924175441.7943-13-casey@schaufler-ca.com> In-Reply-To: <20210924175441.7943-1-casey@schaufler-ca.com> References: <20210924175441.7943-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	[v29,01/28] LSM: Infrastructure management of the sock security \| expand [v29,01/28] LSM: Infrastructure management of the sock security [v29,02/28] LSM: Add the lsmblob data structure. [v29,03/28] LSM: provide lsm name and id slot mappings [v29,04/28] IMA: avoid label collisions with stacked LSMs [v29,05/28] LSM: Use lsmblob in security_audit_rule_match [v29,06/28] LSM: Use lsmblob in security_kernel_act_as [v29,07/28] LSM: Use lsmblob in security_secctx_to_secid [v29,08/28] LSM: Use lsmblob in security_secid_to_secctx [v29,09/28] LSM: Use lsmblob in security_ipc_getsecid [v29,10/28] LSM: Use lsmblob in security_task_getsecid [v29,11/28] LSM: Use lsmblob in security_inode_getsecid [v29,12/28] LSM: Use lsmblob in security_cred_getsecid [v29,13/28] IMA: Change internal interfaces to use lsmblobs [v29,14/28] LSM: Specify which LSM to display [v29,15/28] LSM: Ensure the correct LSM context releaser [v29,16/28] LSM: Use lsmcontext in security_secid_to_secctx [v29,17/28] LSM: Use lsmcontext in security_inode_getsecctx [v29,18/28] LSM: security_secid_to_secctx in netlink netfilter [v29,19/28] NET: Store LSM netlabel data in a lsmblob [v29,20/28] LSM: Verify LSM display sanity in binder [v29,21/28] LSM: Extend security_secid_to_secctx to include module selection [v29,22/28] Audit: Keep multiple LSM data in audit_names [v29,23/28] Audit: Create audit_stamp structure [v29,24/28] Audit: Add framework for auxiliary records [v29,25/28] Audit: Add record for multiple task security contexts [v29,26/28] Audit: Add record for multiple object security contexts [v29,27/28] LSM: Add /proc attr entry for full LSM context [v29,28/28] AppArmor: Remove the exclusive flag

diff --git a/include/linux/security.h b/include/linux/security.h index 5a336fa10818..58c853eabcc9 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -482,7 +482,7 @@ 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 d6a2c899a8db..d43a08eabd86 100644 --- a/kernel/audit.h +++ b/kernel/audit.h @@ -12,6 +12,7 @@ #include <linux/fs.h> #include <linux/audit.h> #include <linux/skbuff.h> +#include <linux/security.h> #include <uapi/linux/mqueue.h> #include <linux/tty.h> @@ -137,7 +138,7 @@ 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 dcd1b988a2d3..b5807b9b8a4d 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -111,7 +111,7 @@ 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; }; @@ -997,14 +997,14 @@ 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) @@ -1013,9 +1013,8 @@ 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 { @@ -1590,7 +1589,7 @@ 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; } @@ -1599,7 +1598,7 @@ 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) { @@ -1775,7 +1774,7 @@ void __audit_syscall_exit(int success, long return_code) context->aux = NULL; context->aux_pids = NULL; context->target_pid = 0; - context->target_sid = 0; + lsmblob_init(&context->target_lsm, 0); context->sockaddr_len = 0; context->type = 0; context->fds[0] = -1; @@ -2434,15 +2433,12 @@ 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); } @@ -2458,7 +2454,6 @@ 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; @@ -2470,9 +2465,7 @@ 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; } @@ -2493,9 +2486,7 @@ 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 5fbcccbdbccd..f5e9f2eaf5da 100644 --- a/security/security.c +++ b/security/security.c @@ -1799,10 +1799,16 @@ 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);

[v29,12/28] LSM: Use lsmblob in security_cred_getsecid

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