Merge tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit

Pull audit updates from Paul Moore:
"Another reasonable chunk of audit changes for v4.18, thirteen patches
in total.

The thirteen patches can mostly be broken down into one of four
categories: general bug fixes, accessor functions for audit state
stored in the task_struct, negative filter matches on executable
names, and extending the (relatively) new seccomp logging knobs to the
audit subsystem.

The main driver for the accessor functions from Richard are the
changes we're working on to associate audit events with containers,
but I think they have some standalone value too so I figured it would
be good to get them in now.

The seccomp/audit patches from Tyler apply the seccomp logging
improvements from a few releases ago to audit's seccomp logging;
starting with this patchset the changes in
/proc/sys/kernel/seccomp/actions_logged should apply to both the
standard kernel logging and audit.

As usual, everything passes the audit-testsuite and it happens to
merge cleanly with your tree"

[ Heh, except it had trivial merge conflicts with the SELinux tree that
also came in from Paul - Linus ]

* tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
audit: Fix wrong task in comparison of session ID
audit: use existing session info function
audit: normalize loginuid read access
audit: use new audit_context access funciton for seccomp_actions_logged
audit: use inline function to set audit context
audit: use inline function to get audit context
audit: convert sessionid unset to a macro
seccomp: Don't special case audited processes when logging
seccomp: Audit attempts to modify the actions_logged sysctl
seccomp: Configurable separator for the actions_logged string
seccomp: Separate read and write code for actions_logged sysctl
audit: allow not equal op for audit by executable
audit: add syscall information to FEATURE_CHANGE records

Documentation/userspace-api/seccomp_filter.rst

···
 	to the file do not need to be in ordered form but reads from the file
 	will be ordered in the same way as the actions_avail sysctl.
 
-	It is important to note that the value of ``actions_logged`` does not
-	prevent certain actions from being logged when the audit subsystem is
-	configured to audit a task. If the action is not found in
-	``actions_logged`` list, the final decision on whether to audit the
-	action for that task is ultimately left up to the audit subsystem to
-	decide for all seccomp return values other than ``SECCOMP_RET_ALLOW``.
-
 	The ``allow`` string is not accepted in the ``actions_logged`` sysctl
 	as it is not possible to log ``SECCOMP_RET_ALLOW`` actions. Attempting
 	to write ``allow`` to the sysctl will result in an EINVAL being

include/linux/audit.h

···
 extern void __audit_inode_child(struct inode *parent,
 				const struct dentry *dentry,
 				const unsigned char type);
-extern void __audit_seccomp(unsigned long syscall, long signr, int code);
+extern void audit_seccomp(unsigned long syscall, long signr, int code);
+extern void audit_seccomp_actions_logged(const char *names,
+					 const char *old_names, int res);
 extern void __audit_ptrace(struct task_struct *t);
+
+static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
+{
+	task->audit_context = ctx;
+}
+
+static inline struct audit_context *audit_context(void)
+{
+	return current->audit_context;
+}
 
 static inline bool audit_dummy_context(void)
 {
-	void *p = current->audit_context;
+	void *p = audit_context();
 	return !p || *(int *)p;
 }
 static inline void audit_free(struct task_struct *task)
···
 				       unsigned long a1, unsigned long a2,
 				       unsigned long a3)
 {
-	if (unlikely(current->audit_context))
+	if (unlikely(audit_context()))
 		__audit_syscall_entry(major, a0, a1, a2, a3);
 }
 static inline void audit_syscall_exit(void *pt_regs)
 {
-	if (unlikely(current->audit_context)) {
+	if (unlikely(audit_context())) {
 		int success = is_syscall_success(pt_regs);
 		long return_code = regs_return_value(pt_regs);
 
···
 		__audit_inode_child(parent, dentry, type);
 }
 void audit_core_dumps(long signr);
-
-static inline void audit_seccomp(unsigned long syscall, long signr, int code)
-{
-	if (audit_enabled && unlikely(!audit_dummy_context()))
-		__audit_seccomp(syscall, signr, code);
-}
 
 static inline void audit_ptrace(struct task_struct *t)
 {
···
 {
 	return true;
 }
+static inline void audit_set_context(struct task_struct *task, struct audit_context *ctx)
+{ }
+static inline struct audit_context *audit_context(void)
+{
+	return NULL;
+}
 static inline struct filename *audit_reusename(const __user char *name)
 {
 	return NULL;
···
 { }
 static inline void audit_core_dumps(long signr)
 { }
-static inline void __audit_seccomp(unsigned long syscall, long signr, int code)
-{ }
 static inline void audit_seccomp(unsigned long syscall, long signr, int code)
+{ }
+static inline void audit_seccomp_actions_logged(const char *names,
+						const char *old_names, int res)
 { }
 static inline int auditsc_get_stamp(struct audit_context *ctx,
 			      struct timespec64 *t, unsigned int *serial)
···
 }
 static inline unsigned int audit_get_sessionid(struct task_struct *tsk)
 {
-	return -1;
+	return AUDIT_SID_UNSET;
 }
 static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
 { }

include/net/xfrm.h

···
 
 	if (audit_enabled == 0)
 		return NULL;
-	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
+	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC,
 				    AUDIT_MAC_IPSEC_EVENT);
 	if (audit_buf == NULL)
 		return NULL;
···
 					    audit_get_loginuid(current) :
 					    INVALID_UID);
 	const unsigned int ses = task_valid ? audit_get_sessionid(current) :
-		(unsigned int) -1;
+		AUDIT_SID_UNSET;
 
 	audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
 	audit_log_task_context(audit_buf);

include/uapi/linux/audit.h

···
 };
 
 #define AUDIT_UID_UNSET (unsigned int)-1
+#define AUDIT_SID_UNSET ((unsigned int)-1)
 
 /* audit_rule_data supports filter rules with both integer and string
  * fields.  It corresponds with AUDIT_ADD_RULE, AUDIT_DEL_RULE and

init/init_task.c

···
 #include <linux/init.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/audit.h>
 
 #include <asm/pgtable.h>
 #include <linux/uaccess.h>
···
 	.thread_node	= LIST_HEAD_INIT(init_signals.thread_head),
 #ifdef CONFIG_AUDITSYSCALL
 	.loginuid	= INVALID_UID,
-	.sessionid	= (unsigned int)-1,
+	.sessionid	= AUDIT_SID_UNSET,
 #endif
 #ifdef CONFIG_PERF_EVENTS
 	.perf_event_mutex = __MUTEX_INITIALIZER(init_task.perf_event_mutex),

kernel/audit.c

···
 
 	if (audit_enabled == AUDIT_OFF)
 		return;
-
-	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_FEATURE_CHANGE);
 	if (!ab)
 		return;
 	audit_log_task_info(ab, current);
···
 		return;
 
 	/* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
-	ab = audit_log_start(current->audit_context, GFP_KERNEL,
-			     AUDIT_ANOM_LINK);
+	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_ANOM_LINK);
 	if (!ab)
 		return;
 	audit_log_format(ab, "op=%s", operation);

kernel/audit_watch.c

···
 		/* If the update involves invalidating rules, do the inode-based
 		 * filtering now, so we don't omit records. */
 		if (invalidating && !audit_dummy_context())
-			audit_filter_inodes(current, current->audit_context);
+			audit_filter_inodes(current, audit_context());
 
 		/* updating ino will likely change which audit_hash_list we
 		 * are on so we need a new watch for the new list */

kernel/auditfilter.c

···
 			return -EINVAL;
 		break;
 	case AUDIT_EXE:
-		if (f->op != Audit_equal)
+		if (f->op != Audit_not_equal && f->op != Audit_equal)
 			return -EINVAL;
 		if (entry->rule.listnr != AUDIT_FILTER_EXIT)
 			return -EINVAL;
···
 static void audit_log_rule_change(char *action, struct audit_krule *rule, int res)
 {
 	struct audit_buffer *ab;
-	uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
-	unsigned int sessionid = audit_get_sessionid(current);
 
 	if (!audit_enabled)
 		return;
···
 	ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
 	if (!ab)
 		return;
-	audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
+	audit_log_session_info(ab);
 	audit_log_task_context(ab);
 	audit_log_format(ab, " op=%s", action);
 	audit_log_key(ab, rule->filterkey);

kernel/auditsc.c

···
 	case AUDIT_COMPARE_EGID_TO_OBJ_GID:
 		return audit_compare_gid(cred->egid, name, f, ctx);
 	case AUDIT_COMPARE_AUID_TO_OBJ_UID:
-		return audit_compare_uid(tsk->loginuid, name, f, ctx);
+		return audit_compare_uid(audit_get_loginuid(tsk), name, f, ctx);
 	case AUDIT_COMPARE_SUID_TO_OBJ_UID:
 		return audit_compare_uid(cred->suid, name, f, ctx);
 	case AUDIT_COMPARE_SGID_TO_OBJ_GID:
···
 		return audit_compare_gid(cred->fsgid, name, f, ctx);
 	/* uid comparisons */
 	case AUDIT_COMPARE_UID_TO_AUID:
-		return audit_uid_comparator(cred->uid, f->op, tsk->loginuid);
+		return audit_uid_comparator(cred->uid, f->op,
+					    audit_get_loginuid(tsk));
 	case AUDIT_COMPARE_UID_TO_EUID:
 		return audit_uid_comparator(cred->uid, f->op, cred->euid);
 	case AUDIT_COMPARE_UID_TO_SUID:
···
 		return audit_uid_comparator(cred->uid, f->op, cred->fsuid);
 	/* auid comparisons */
 	case AUDIT_COMPARE_AUID_TO_EUID:
-		return audit_uid_comparator(tsk->loginuid, f->op, cred->euid);
+		return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
+					    cred->euid);
 	case AUDIT_COMPARE_AUID_TO_SUID:
-		return audit_uid_comparator(tsk->loginuid, f->op, cred->suid);
+		return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
+					    cred->suid);
 	case AUDIT_COMPARE_AUID_TO_FSUID:
-		return audit_uid_comparator(tsk->loginuid, f->op, cred->fsuid);
+		return audit_uid_comparator(audit_get_loginuid(tsk), f->op,
+					    cred->fsuid);
 	/* euid comparisons */
 	case AUDIT_COMPARE_EUID_TO_SUID:
 		return audit_uid_comparator(cred->euid, f->op, cred->suid);
···
 			break;
 		case AUDIT_EXE:
 			result = audit_exe_compare(tsk, rule->exe);
+			if (f->op == Audit_not_equal)
+				result = !result;
 			break;
 		case AUDIT_UID:
 			result = audit_uid_comparator(cred->uid, f->op, f->uid);
···
 			result = audit_gid_comparator(cred->fsgid, f->op, f->gid);
 			break;
 		case AUDIT_SESSIONID:
-			sessionid = audit_get_sessionid(current);
+			sessionid = audit_get_sessionid(tsk);
 			result = audit_comparator(sessionid, f->op, f->val);
 			break;
 		case AUDIT_PERS:
···
 				result = match_tree_refs(ctx, rule->tree);
 			break;
 		case AUDIT_LOGINUID:
-			result = audit_uid_comparator(tsk->loginuid, f->op, f->uid);
+			result = audit_uid_comparator(audit_get_loginuid(tsk),
+						      f->op, f->uid);
 			break;
 		case AUDIT_LOGINUID_SET:
 			result = audit_comparator(audit_loginuid_set(tsk), f->op, f->val);
···
 		audit_filter_inodes(tsk, context);
 	}
 
-	tsk->audit_context = NULL;
+	audit_set_context(tsk, NULL);
 	return context;
 }
 
···
 	}
 	context->filterkey = key;
 
-	tsk->audit_context  = context;
+	audit_set_context(tsk, context);
 	set_tsk_thread_flag(tsk, TIF_SYSCALL_AUDIT);
 	return 0;
 }
···
 void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
 			   unsigned long a3, unsigned long a4)
 {
-	struct task_struct *tsk = current;
-	struct audit_context *context = tsk->audit_context;
+	struct audit_context *context = audit_context();
 	enum audit_state     state;
 
 	if (!audit_enabled || !context)
···
 	context->dummy = !audit_n_rules;
 	if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
 		context->prio = 0;
-		if (auditd_test_task(tsk))
+		if (auditd_test_task(current))
 			return;
 	}
 
···
  */
 void __audit_syscall_exit(int success, long return_code)
 {
-	struct task_struct *tsk = current;
 	struct audit_context *context;
 
 	if (success)
···
 	else
 		success = AUDITSC_FAILURE;
 
-	context = audit_take_context(tsk, success, return_code);
+	context = audit_take_context(current, success, return_code);
 	if (!context)
 		return;
 
 	if (context->in_syscall && context->current_state == AUDIT_RECORD_CONTEXT)
-		audit_log_exit(context, tsk);
+		audit_log_exit(context, current);
 
 	context->in_syscall = 0;
 	context->prio = context->state == AUDIT_RECORD_CONTEXT ? ~0ULL : 0;
···
 		kfree(context->filterkey);
 		context->filterkey = NULL;
 	}
-	tsk->audit_context = context;
+	audit_set_context(current, context);
 }
 
 static inline void handle_one(const struct inode *inode)
···
 	int count;
 	if (likely(!inode->i_fsnotify_marks))
 		return;
-	context = current->audit_context;
+	context = audit_context();
 	p = context->trees;
 	count = context->tree_count;
 	rcu_read_lock();
···
 	unsigned long seq;
 	int count;
 
-	context = current->audit_context;
+	context = audit_context();
 	p = context->trees;
 	count = context->tree_count;
 retry:
···
 struct filename *
 __audit_reusename(const __user char *uptr)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct audit_names *n;
 
 	list_for_each_entry(n, &context->names_list, list) {
···
  */
 void __audit_getname(struct filename *name)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct audit_names *n;
 
 	if (!context->in_syscall)
···
 void __audit_inode(struct filename *name, const struct dentry *dentry,
 		   unsigned int flags)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct inode *inode = d_backing_inode(dentry);
 	struct audit_names *n;
 	bool parent = flags & AUDIT_INODE_PARENT;
···
 			 const struct dentry *dentry,
 			 const unsigned char type)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct inode *inode = d_backing_inode(dentry);
 	const char *dname = dentry->d_name.name;
 	struct audit_names *n, *found_parent = NULL, *found_child = NULL;
···
 int audit_set_loginuid(kuid_t loginuid)
 {
 	struct task_struct *task = current;
-	unsigned int oldsessionid, sessionid = (unsigned int)-1;
+	unsigned int oldsessionid, sessionid = AUDIT_SID_UNSET;
 	kuid_t oldloginuid;
 	int rc;
 
···
 	/* are we setting or clearing? */
 	if (uid_valid(loginuid)) {
 		sessionid = (unsigned int)atomic_inc_return(&session_id);
-		if (unlikely(sessionid == (unsigned int)-1))
+		if (unlikely(sessionid == AUDIT_SID_UNSET))
 			sessionid = (unsigned int)atomic_inc_return(&session_id);
 	}
 
···
  */
 void __audit_mq_open(int oflag, umode_t mode, struct mq_attr *attr)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	if (attr)
 		memcpy(&context->mq_open.attr, attr, sizeof(struct mq_attr));
···
 void __audit_mq_sendrecv(mqd_t mqdes, size_t msg_len, unsigned int msg_prio,
 			const struct timespec64 *abs_timeout)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct timespec64 *p = &context->mq_sendrecv.abs_timeout;
 
 	if (abs_timeout)
···
 
 void __audit_mq_notify(mqd_t mqdes, const struct sigevent *notification)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	if (notification)
 		context->mq_notify.sigev_signo = notification->sigev_signo;
···
  */
 void __audit_mq_getsetattr(mqd_t mqdes, struct mq_attr *mqstat)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	context->mq_getsetattr.mqdes = mqdes;
 	context->mq_getsetattr.mqstat = *mqstat;
 	context->type = AUDIT_MQ_GETSETATTR;
···
  */
 void __audit_ipc_obj(struct kern_ipc_perm *ipcp)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	context->ipc.uid = ipcp->uid;
 	context->ipc.gid = ipcp->gid;
 	context->ipc.mode = ipcp->mode;
···
  */
 void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	context->ipc.qbytes = qbytes;
 	context->ipc.perm_uid = uid;
···
 
 void __audit_bprm(struct linux_binprm *bprm)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	context->type = AUDIT_EXECVE;
 	context->execve.argc = bprm->argc;
···
  */
 int __audit_socketcall(int nargs, unsigned long *args)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	if (nargs <= 0 || nargs > AUDITSC_ARGS || !args)
 		return -EINVAL;
···
  */
 void __audit_fd_pair(int fd1, int fd2)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	context->fds[0] = fd1;
 	context->fds[1] = fd2;
 }
···
  */
 int __audit_sockaddr(int len, void *a)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	if (!context->sockaddr) {
 		void *p = kmalloc(sizeof(struct sockaddr_storage), GFP_KERNEL);
···
 
 void __audit_ptrace(struct task_struct *t)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	context->target_pid = task_tgid_nr(t);
 	context->target_auid = audit_get_loginuid(t);
···
 int audit_signal_info(int sig, struct task_struct *t)
 {
 	struct audit_aux_data_pids *axp;
-	struct task_struct *tsk = current;
-	struct audit_context *ctx = tsk->audit_context;
-	kuid_t uid = current_uid(), t_uid = task_uid(t);
+	struct audit_context *ctx = audit_context();
+	kuid_t uid = current_uid(), auid, t_uid = task_uid(t);
 
 	if (auditd_test_task(t) &&
 	    (sig == SIGTERM || sig == SIGHUP ||
 	     sig == SIGUSR1 || sig == SIGUSR2)) {
-		audit_sig_pid = task_tgid_nr(tsk);
-		if (uid_valid(tsk->loginuid))
-			audit_sig_uid = tsk->loginuid;
+		audit_sig_pid = task_tgid_nr(current);
+		auid = audit_get_loginuid(current);
+		if (uid_valid(auid))
+			audit_sig_uid = auid;
 		else
 			audit_sig_uid = uid;
-		security_task_getsecid(tsk, &audit_sig_sid);
+		security_task_getsecid(current, &audit_sig_sid);
 	}
 
 	if (!audit_signals || audit_dummy_context())
···
 			   const struct cred *new, const struct cred *old)
 {
 	struct audit_aux_data_bprm_fcaps *ax;
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	struct cpu_vfs_cap_data vcaps;
 
 	ax = kmalloc(sizeof(*ax), GFP_KERNEL);
···
  */
 void __audit_log_capset(const struct cred *new, const struct cred *old)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	context->capset.pid = task_tgid_nr(current);
 	context->capset.cap.effective   = new->cap_effective;
 	context->capset.cap.inheritable = new->cap_effective;
···
 
 void __audit_mmap_fd(int fd, int flags)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 	context->mmap.fd = fd;
 	context->mmap.flags = flags;
 	context->type = AUDIT_MMAP;
···
 
 void __audit_log_kern_module(char *name)
 {
-	struct audit_context *context = current->audit_context;
+	struct audit_context *context = audit_context();
 
 	context->module.name = kmalloc(strlen(name) + 1, GFP_KERNEL);
 	strcpy(context->module.name, name);
···
 
 void __audit_fanotify(unsigned int response)
 {
-	audit_log(current->audit_context, GFP_KERNEL,
+	audit_log(audit_context(), GFP_KERNEL,
 		AUDIT_FANOTIFY,	"resp=%u", response);
 }
 
···
 	audit_log_end(ab);
 }
 
-void __audit_seccomp(unsigned long syscall, long signr, int code)
+/**
+ * audit_seccomp - record information about a seccomp action
+ * @syscall: syscall number
+ * @signr: signal value
+ * @code: the seccomp action
+ *
+ * Record the information associated with a seccomp action. Event filtering for
+ * seccomp actions that are not to be logged is done in seccomp_log().
+ * Therefore, this function forces auditing independent of the audit_enabled
+ * and dummy context state because seccomp actions should be logged even when
+ * audit is not in use.
+ */
+void audit_seccomp(unsigned long syscall, long signr, int code)
 {
 	struct audit_buffer *ab;
 
···
 	audit_log_end(ab);
 }
 
+void audit_seccomp_actions_logged(const char *names, const char *old_names,
+				  int res)
+{
+	struct audit_buffer *ab;
+
+	if (!audit_enabled)
+		return;
+
+	ab = audit_log_start(audit_context(), GFP_KERNEL,
+			     AUDIT_CONFIG_CHANGE);
+	if (unlikely(!ab))
+		return;
+
+	audit_log_format(ab, "op=seccomp-logging");
+	audit_log_format(ab, " actions=%s", names);
+	audit_log_format(ab, " old-actions=%s", old_names);
+	audit_log_format(ab, " res=%d", res);
+	audit_log_end(ab);
+}
+
 struct list_head *audit_killed_trees(void)
 {
-	struct audit_context *ctx = current->audit_context;
+	struct audit_context *ctx = audit_context();
 	if (likely(!ctx || !ctx->in_syscall))
 		return NULL;
 	return &ctx->killed_trees;

kernel/fork.c

···
 	p->start_time = ktime_get_ns();
 	p->real_start_time = ktime_get_boot_ns();
 	p->io_context = NULL;
-	p->audit_context = NULL;
+	audit_set_context(p, NULL);
 	cgroup_fork(p);
 #ifdef CONFIG_NUMA
 	p->mempolicy = mpol_dup(p->mempolicy);

kernel/seccomp.c

···
 	}
 
 	/*
-	 * Force an audit message to be emitted when the action is RET_KILL_*,
-	 * RET_LOG, or the FILTER_FLAG_LOG bit was set and the action is
-	 * allowed to be logged by the admin.
+	 * Emit an audit message when the action is RET_KILL_*, RET_LOG, or the
+	 * FILTER_FLAG_LOG bit was set. The admin has the ability to silence
+	 * any action from being logged by removing the action name from the
+	 * seccomp_actions_logged sysctl.
 	 */
-	if (log)
-		return __audit_seccomp(syscall, signr, action);
+	if (!log)
+		return;
 
-	/*
-	 * Let the audit subsystem decide if the action should be audited based
-	 * on whether the current task itself is being audited.
-	 */
-	return audit_seccomp(syscall, signr, action);
+	audit_seccomp(syscall, signr, action);
 }
 
 /*
···
 };
 
 static bool seccomp_names_from_actions_logged(char *names, size_t size,
-					      u32 actions_logged)
+					      u32 actions_logged,
+					      const char *sep)
 {
 	const struct seccomp_log_name *cur;
-	bool append_space = false;
+	bool append_sep = false;
 
 	for (cur = seccomp_log_names; cur->name && size; cur++) {
 		ssize_t ret;
···
 		if (!(actions_logged & cur->log))
 			continue;
 
-		if (append_space) {
-			ret = strscpy(names, " ", size);
+		if (append_sep) {
+			ret = strscpy(names, sep, size);
 			if (ret < 0)
 				return false;
 
 			names += ret;
 			size -= ret;
 		} else
-			append_space = true;
+			append_sep = true;
 
 		ret = strscpy(names, cur->name, size);
 		if (ret < 0)
···
 	return true;
 }
 
-static int seccomp_actions_logged_handler(struct ctl_table *ro_table, int write,
-					  void __user *buffer, size_t *lenp,
-					  loff_t *ppos)
+static int read_actions_logged(struct ctl_table *ro_table, void __user *buffer,
+			       size_t *lenp, loff_t *ppos)
+{
+	char names[sizeof(seccomp_actions_avail)];
+	struct ctl_table table;
+
+	memset(names, 0, sizeof(names));
+
+	if (!seccomp_names_from_actions_logged(names, sizeof(names),
+					       seccomp_actions_logged, " "))
+		return -EINVAL;
+
+	table = *ro_table;
+	table.data = names;
+	table.maxlen = sizeof(names);
+	return proc_dostring(&table, 0, buffer, lenp, ppos);
+}
+
+static int write_actions_logged(struct ctl_table *ro_table, void __user *buffer,
+				size_t *lenp, loff_t *ppos, u32 *actions_logged)
 {
 	char names[sizeof(seccomp_actions_avail)];
 	struct ctl_table table;
 	int ret;
 
-	if (write && !capable(CAP_SYS_ADMIN))
+	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
 	memset(names, 0, sizeof(names));
 
-	if (!write) {
-		if (!seccomp_names_from_actions_logged(names, sizeof(names),
-						       seccomp_actions_logged))
-			return -EINVAL;
-	}
-
 	table = *ro_table;
 	table.data = names;
 	table.maxlen = sizeof(names);
-	ret = proc_dostring(&table, write, buffer, lenp, ppos);
+	ret = proc_dostring(&table, 1, buffer, lenp, ppos);
 	if (ret)
 		return ret;
 
-	if (write) {
-		u32 actions_logged;
+	if (!seccomp_actions_logged_from_names(actions_logged, table.data))
+		return -EINVAL;
 
-		if (!seccomp_actions_logged_from_names(&actions_logged,
-						       table.data))
-			return -EINVAL;
+	if (*actions_logged & SECCOMP_LOG_ALLOW)
+		return -EINVAL;
 
-		if (actions_logged & SECCOMP_LOG_ALLOW)
-			return -EINVAL;
-
-		seccomp_actions_logged = actions_logged;
-	}
-
+	seccomp_actions_logged = *actions_logged;
 	return 0;
+}
+
+static void audit_actions_logged(u32 actions_logged, u32 old_actions_logged,
+				 int ret)
+{
+	char names[sizeof(seccomp_actions_avail)];
+	char old_names[sizeof(seccomp_actions_avail)];
+	const char *new = names;
+	const char *old = old_names;
+
+	if (!audit_enabled)
+		return;
+
+	memset(names, 0, sizeof(names));
+	memset(old_names, 0, sizeof(old_names));
+
+	if (ret)
+		new = "?";
+	else if (!actions_logged)
+		new = "(none)";
+	else if (!seccomp_names_from_actions_logged(names, sizeof(names),
+						    actions_logged, ","))
+		new = "?";
+
+	if (!old_actions_logged)
+		old = "(none)";
+	else if (!seccomp_names_from_actions_logged(old_names,
+						    sizeof(old_names),
+						    old_actions_logged, ","))
+		old = "?";
+
+	return audit_seccomp_actions_logged(new, old, !ret);
+}
+
+static int seccomp_actions_logged_handler(struct ctl_table *ro_table, int write,
+					  void __user *buffer, size_t *lenp,
+					  loff_t *ppos)
+{
+	int ret;
+
+	if (write) {
+		u32 actions_logged = 0;
+		u32 old_actions_logged = seccomp_actions_logged;
+
+		ret = write_actions_logged(ro_table, buffer, lenp, ppos,
+					   &actions_logged);
+		audit_actions_logged(actions_logged, old_actions_logged, ret);
+	} else
+		ret = read_actions_logged(ro_table, buffer, lenp, ppos);
+
+	return ret;
 }
 
 static struct ctl_path seccomp_sysctl_path[] = {

net/bridge/netfilter/ebtables.c

···
 
 #ifdef CONFIG_AUDIT
 	if (audit_enabled) {
-		audit_log(current->audit_context, GFP_KERNEL,
+		audit_log(audit_context(), GFP_KERNEL,
 			  AUDIT_NETFILTER_CFG,
 			  "table=%s family=%u entries=%u",
 			  repl->name, AF_BRIDGE, repl->nentries);

net/core/dev.c

···
 			dev->flags & IFF_PROMISC ? "entered" : "left");
 		if (audit_enabled) {
 			current_uid_gid(&uid, &gid);
-			audit_log(current->audit_context, GFP_ATOMIC,
-				AUDIT_ANOM_PROMISCUOUS,
-				"dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
-				dev->name, (dev->flags & IFF_PROMISC),
-				(old_flags & IFF_PROMISC),
-				from_kuid(&init_user_ns, audit_get_loginuid(current)),
-				from_kuid(&init_user_ns, uid),
-				from_kgid(&init_user_ns, gid),
-				audit_get_sessionid(current));
+			audit_log(audit_context(), GFP_ATOMIC,
+				  AUDIT_ANOM_PROMISCUOUS,
+				  "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
+				  dev->name, (dev->flags & IFF_PROMISC),
+				  (old_flags & IFF_PROMISC),
+				  from_kuid(&init_user_ns, audit_get_loginuid(current)),
+				  from_kuid(&init_user_ns, uid),
+				  from_kgid(&init_user_ns, gid),
+				  audit_get_sessionid(current));
 		}
 
 		dev_change_rx_flags(dev, IFF_PROMISC);

net/netfilter/x_tables.c

···
 
 #ifdef CONFIG_AUDIT
 	if (audit_enabled) {
-		audit_log(current->audit_context, GFP_KERNEL,
+		audit_log(audit_context(), GFP_KERNEL,
 			  AUDIT_NETFILTER_CFG,
 			  "table=%s family=%u entries=%u",
 			  table->name, table->af, private->number);

net/netlabel/netlabel_user.c

···
 	if (audit_enabled == 0)
 		return NULL;
 
-	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);
+	audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type);
 	if (audit_buf == NULL)
 		return NULL;
 

security/integrity/ima/ima_api.c

···
 		hex_byte_pack(hash + (i * 2), iint->ima_hash->digest[i]);
 	hash[i * 2] = '\0';
 
-	ab = audit_log_start(current->audit_context, GFP_KERNEL,
+	ab = audit_log_start(audit_context(), GFP_KERNEL,
 			     AUDIT_INTEGRITY_RULE);
 	if (!ab)
 		goto out;

security/integrity/integrity_audit.c

···
 	if (!integrity_audit_info && audit_info == 1)	/* Skip info messages */
 		return;
 
-	ab = audit_log_start(current->audit_context, GFP_KERNEL, audit_msgno);
+	ab = audit_log_start(audit_context(), GFP_KERNEL, audit_msgno);
 	audit_log_format(ab, "pid=%d uid=%u auid=%u ses=%u",
 			 task_pid_nr(current),
 			 from_kuid(&init_user_ns, current_cred()->uid),

security/lsm_audit.c

···
 	if (a == NULL)
 		return;
 	/* we use GFP_ATOMIC so we won't sleep */
-	ab = audit_log_start(current->audit_context, GFP_ATOMIC | __GFP_NOWARN,
+	ab = audit_log_start(audit_context(), GFP_ATOMIC | __GFP_NOWARN,
 			     AUDIT_AVC);
 
 	if (ab == NULL)

security/selinux/hooks.c

···
 			} else {
 				audit_size = 0;
 			}
-			ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
+			ab = audit_log_start(audit_context(),
+					     GFP_ATOMIC, AUDIT_SELINUX_ERR);
 			audit_log_format(ab, "op=setxattr invalid_context=");
 			audit_log_n_untrustedstring(ab, value, audit_size);
 			audit_log_end(ab);
···
 					audit_size = size - 1;
 				else
 					audit_size = size;
-				ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR);
+				ab = audit_log_start(audit_context(),
+						     GFP_ATOMIC,
+						     AUDIT_SELINUX_ERR);
 				audit_log_format(ab, "op=fscreate invalid_context=");
 				audit_log_n_untrustedstring(ab, value, audit_size);
 				audit_log_end(ab);

security/selinux/selinuxfs.c

···
 				      NULL);
 		if (length)
 			goto out;
-		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
+		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
 			" enabled=%d old-enabled=%d lsm=selinux res=1",
 			new_value, old_value,
···
 		length = selinux_disable(fsi->state);
 		if (length)
 			goto out;
-		audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
+		audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_STATUS,
 			"enforcing=%d old_enforcing=%d auid=%u ses=%u"
 			" enabled=%d old-enabled=%d lsm=selinux res=1",
 			enforcing, enforcing,
···
 	length = count;
 
 out1:
-	audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
+	audit_log(audit_context(), GFP_KERNEL, AUDIT_MAC_POLICY_LOAD,
 		"auid=%u ses=%u lsm=selinux res=1",
 		from_kuid(&init_user_ns, audit_get_loginuid(current)),
 		audit_get_sessionid(current));

security/selinux/ss/services.c

···
 		goto out;
 
 	/* audit a message */
-	ab = audit_log_start(current->audit_context,
+	ab = audit_log_start(audit_context(),
 			     GFP_ATOMIC, AUDIT_SELINUX_ERR);
 	if (!ab)
 		goto out;
···
 		goto out;
 	if (context_struct_to_string(p, tcontext, &t, &tlen))
 		goto out;
-	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
+	audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
 		  "op=security_validate_transition seresult=denied"
 		  " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
 		  o, n, t, sym_name(p, SYM_CLASSES, tclass-1));
···
 					      &old_name, &length) &&
 		    !context_struct_to_string(policydb, new_context,
 					      &new_name, &length)) {
-			audit_log(current->audit_context,
+			audit_log(audit_context(),
 				  GFP_ATOMIC, AUDIT_SELINUX_ERR,
 				  "op=security_bounded_transition "
 				  "seresult=denied "
···
 		goto out;
 	if (context_struct_to_string(policydb, newcontext, &n, &nlen))
 		goto out;
-	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
+	audit_log(audit_context(), GFP_ATOMIC, AUDIT_SELINUX_ERR,
 		  "op=security_compute_sid invalid_context=%s"
 		  " scontext=%s"
 		  " tcontext=%s"
···
 
 	for (i = 0; i < len; i++) {
 		if (!!values[i] != policydb->bool_val_to_struct[i]->state) {
-			audit_log(current->audit_context, GFP_ATOMIC,
+			audit_log(audit_context(), GFP_ATOMIC,
 				AUDIT_MAC_CONFIG_CHANGE,
 				"bool=%s val=%d old_val=%d auid=%u ses=%u",
 				sym_name(policydb, SYM_BOOLS, i),
···
 		if (rc) {
 			if (!context_struct_to_string(policydb, &newcon, &s,
 						      &len)) {
-				audit_log(current->audit_context,
+				audit_log(audit_context(),
 					  GFP_ATOMIC, AUDIT_SELINUX_ERR,
 					  "op=security_sid_mls_copy "
 					  "invalid_context=%s", s);