Root/security/apparmor/domain.c

1/*
2 * AppArmor security module
3 *
4 * This file contains AppArmor policy attachment and domain transitions
5 *
6 * Copyright (C) 2002-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation, version 2 of the
12 * License.
13 */
14
15#include <linux/errno.h>
16#include <linux/fdtable.h>
17#include <linux/file.h>
18#include <linux/mount.h>
19#include <linux/syscalls.h>
20#include <linux/tracehook.h>
21#include <linux/personality.h>
22
23#include "include/audit.h"
24#include "include/apparmorfs.h"
25#include "include/context.h"
26#include "include/domain.h"
27#include "include/file.h"
28#include "include/ipc.h"
29#include "include/match.h"
30#include "include/path.h"
31#include "include/policy.h"
32
33/**
34 * aa_free_domain_entries - free entries in a domain table
35 * @domain: the domain table to free (MAYBE NULL)
36 */
37void aa_free_domain_entries(struct aa_domain *domain)
38{
39    int i;
40    if (domain) {
41        if (!domain->table)
42            return;
43
44        for (i = 0; i < domain->size; i++)
45            kzfree(domain->table[i]);
46        kzfree(domain->table);
47        domain->table = NULL;
48    }
49}
50
51/**
52 * may_change_ptraced_domain - check if can change profile on ptraced task
53 * @task: task we want to change profile of (NOT NULL)
54 * @to_profile: profile to change to (NOT NULL)
55 *
56 * Check if the task is ptraced and if so if the tracing task is allowed
57 * to trace the new domain
58 *
59 * Returns: %0 or error if change not allowed
60 */
61static int may_change_ptraced_domain(struct task_struct *task,
62                     struct aa_profile *to_profile)
63{
64    struct task_struct *tracer;
65    const struct cred *cred = NULL;
66    struct aa_profile *tracerp = NULL;
67    int error = 0;
68
69    rcu_read_lock();
70    tracer = tracehook_tracer_task(task);
71    if (tracer) {
72        /* released below */
73        cred = get_task_cred(tracer);
74        tracerp = aa_cred_profile(cred);
75    }
76    rcu_read_unlock();
77
78    /* not ptraced */
79    if (!tracer || unconfined(tracerp))
80        goto out;
81
82    error = aa_may_ptrace(tracer, tracerp, to_profile, PTRACE_MODE_ATTACH);
83
84out:
85    if (cred)
86        put_cred(cred);
87
88    return error;
89}
90
91/**
92 * change_profile_perms - find permissions for change_profile
93 * @profile: the current profile (NOT NULL)
94 * @ns: the namespace being switched to (NOT NULL)
95 * @name: the name of the profile to change to (NOT NULL)
96 * @request: requested perms
97 * @start: state to start matching in
98 *
99 * Returns: permission set
100 */
101static struct file_perms change_profile_perms(struct aa_profile *profile,
102                          struct aa_namespace *ns,
103                          const char *name, u32 request,
104                          unsigned int start)
105{
106    struct file_perms perms;
107    struct path_cond cond = { };
108    unsigned int state;
109
110    if (unconfined(profile)) {
111        perms.allow = AA_MAY_CHANGE_PROFILE | AA_MAY_ONEXEC;
112        perms.audit = perms.quiet = perms.kill = 0;
113        return perms;
114    } else if (!profile->file.dfa) {
115        return nullperms;
116    } else if ((ns == profile->ns)) {
117        /* try matching against rules with out namespace prepended */
118        aa_str_perms(profile->file.dfa, start, name, &cond, &perms);
119        if (COMBINED_PERM_MASK(perms) & request)
120            return perms;
121    }
122
123    /* try matching with namespace name and then profile */
124    state = aa_dfa_match(profile->file.dfa, start, ns->base.name);
125    state = aa_dfa_match_len(profile->file.dfa, state, ":", 1);
126    aa_str_perms(profile->file.dfa, state, name, &cond, &perms);
127
128    return perms;
129}
130
131/**
132 * __attach_match_ - find an attachment match
133 * @name - to match against (NOT NULL)
134 * @head - profile list to walk (NOT NULL)
135 *
136 * Do a linear search on the profiles in the list. There is a matching
137 * preference where an exact match is preferred over a name which uses
138 * expressions to match, and matching expressions with the greatest
139 * xmatch_len are preferred.
140 *
141 * Requires: @head not be shared or have appropriate locks held
142 *
143 * Returns: profile or NULL if no match found
144 */
145static struct aa_profile *__attach_match(const char *name,
146                     struct list_head *head)
147{
148    int len = 0;
149    struct aa_profile *profile, *candidate = NULL;
150
151    list_for_each_entry(profile, head, base.list) {
152        if (profile->flags & PFLAG_NULL)
153            continue;
154        if (profile->xmatch && profile->xmatch_len > len) {
155            unsigned int state = aa_dfa_match(profile->xmatch,
156                              DFA_START, name);
157            u32 perm = dfa_user_allow(profile->xmatch, state);
158            /* any accepting state means a valid match. */
159            if (perm & MAY_EXEC) {
160                candidate = profile;
161                len = profile->xmatch_len;
162            }
163        } else if (!strcmp(profile->base.name, name))
164            /* exact non-re match, no more searching required */
165            return profile;
166    }
167
168    return candidate;
169}
170
171/**
172 * find_attach - do attachment search for unconfined processes
173 * @ns: the current namespace (NOT NULL)
174 * @list: list to search (NOT NULL)
175 * @name: the executable name to match against (NOT NULL)
176 *
177 * Returns: profile or NULL if no match found
178 */
179static struct aa_profile *find_attach(struct aa_namespace *ns,
180                      struct list_head *list, const char *name)
181{
182    struct aa_profile *profile;
183
184    read_lock(&ns->lock);
185    profile = aa_get_profile(__attach_match(name, list));
186    read_unlock(&ns->lock);
187
188    return profile;
189}
190
191/**
192 * separate_fqname - separate the namespace and profile names
193 * @fqname: the fqname name to split (NOT NULL)
194 * @ns_name: the namespace name if it exists (NOT NULL)
195 *
196 * This is the xtable equivalent routine of aa_split_fqname. It finds the
197 * split in an xtable fqname which contains an embedded \0 instead of a :
198 * if a namespace is specified. This is done so the xtable is constant and
199 * isn't re-split on every lookup.
200 *
201 * Either the profile or namespace name may be optional but if the namespace
202 * is specified the profile name termination must be present. This results
203 * in the following possible encodings:
204 * profile_name\0
205 * :ns_name\0profile_name\0
206 * :ns_name\0\0
207 *
208 * NOTE: the xtable fqname is pre-validated at load time in unpack_trans_table
209 *
210 * Returns: profile name if it is specified else NULL
211 */
212static const char *separate_fqname(const char *fqname, const char **ns_name)
213{
214    const char *name;
215
216    if (fqname[0] == ':') {
217        /* In this case there is guaranteed to be two \0 terminators
218         * in the string. They are verified at load time by
219         * by unpack_trans_table
220         */
221        *ns_name = fqname + 1; /* skip : */
222        name = *ns_name + strlen(*ns_name) + 1;
223        if (!*name)
224            name = NULL;
225    } else {
226        *ns_name = NULL;
227        name = fqname;
228    }
229
230    return name;
231}
232
233static const char *next_name(int xtype, const char *name)
234{
235    return NULL;
236}
237
238/**
239 * x_table_lookup - lookup an x transition name via transition table
240 * @profile: current profile (NOT NULL)
241 * @xindex: index into x transition table
242 *
243 * Returns: refcounted profile, or NULL on failure (MAYBE NULL)
244 */
245static struct aa_profile *x_table_lookup(struct aa_profile *profile, u32 xindex)
246{
247    struct aa_profile *new_profile = NULL;
248    struct aa_namespace *ns = profile->ns;
249    u32 xtype = xindex & AA_X_TYPE_MASK;
250    int index = xindex & AA_X_INDEX_MASK;
251    const char *name;
252
253    /* index is guaranteed to be in range, validated at load time */
254    for (name = profile->file.trans.table[index]; !new_profile && name;
255         name = next_name(xtype, name)) {
256        struct aa_namespace *new_ns;
257        const char *xname = NULL;
258
259        new_ns = NULL;
260        if (xindex & AA_X_CHILD) {
261            /* release by caller */
262            new_profile = aa_find_child(profile, name);
263            continue;
264        } else if (*name == ':') {
265            /* switching namespace */
266            const char *ns_name;
267            xname = name = separate_fqname(name, &ns_name);
268            if (!xname)
269                /* no name so use profile name */
270                xname = profile->base.hname;
271            if (*ns_name == '@') {
272                /* TODO: variable support */
273                ;
274            }
275            /* released below */
276            new_ns = aa_find_namespace(ns, ns_name);
277            if (!new_ns)
278                continue;
279        } else if (*name == '@') {
280            /* TODO: variable support */
281            continue;
282        } else {
283            /* basic namespace lookup */
284            xname = name;
285        }
286
287        /* released by caller */
288        new_profile = aa_lookup_profile(new_ns ? new_ns : ns, xname);
289        aa_put_namespace(new_ns);
290    }
291
292    /* released by caller */
293    return new_profile;
294}
295
296/**
297 * x_to_profile - get target profile for a given xindex
298 * @profile: current profile (NOT NULL)
299 * @name: name to lookup (NOT NULL)
300 * @xindex: index into x transition table
301 *
302 * find profile for a transition index
303 *
304 * Returns: refcounted profile or NULL if not found available
305 */
306static struct aa_profile *x_to_profile(struct aa_profile *profile,
307                       const char *name, u32 xindex)
308{
309    struct aa_profile *new_profile = NULL;
310    struct aa_namespace *ns = profile->ns;
311    u32 xtype = xindex & AA_X_TYPE_MASK;
312
313    switch (xtype) {
314    case AA_X_NONE:
315        /* fail exec unless ix || ux fallback - handled by caller */
316        return NULL;
317    case AA_X_NAME:
318        if (xindex & AA_X_CHILD)
319            /* released by caller */
320            new_profile = find_attach(ns, &profile->base.profiles,
321                          name);
322        else
323            /* released by caller */
324            new_profile = find_attach(ns, &ns->base.profiles,
325                          name);
326        break;
327    case AA_X_TABLE:
328        /* released by caller */
329        new_profile = x_table_lookup(profile, xindex);
330        break;
331    }
332
333    /* released by caller */
334    return new_profile;
335}
336
337/**
338 * apparmor_bprm_set_creds - set the new creds on the bprm struct
339 * @bprm: binprm for the exec (NOT NULL)
340 *
341 * Returns: %0 or error on failure
342 */
343int apparmor_bprm_set_creds(struct linux_binprm *bprm)
344{
345    struct aa_task_cxt *cxt;
346    struct aa_profile *profile, *new_profile = NULL;
347    struct aa_namespace *ns;
348    char *buffer = NULL;
349    unsigned int state;
350    struct file_perms perms = {};
351    struct path_cond cond = {
352        bprm->file->f_path.dentry->d_inode->i_uid,
353        bprm->file->f_path.dentry->d_inode->i_mode
354    };
355    const char *name = NULL, *target = NULL, *info = NULL;
356    int error = cap_bprm_set_creds(bprm);
357    if (error)
358        return error;
359
360    if (bprm->cred_prepared)
361        return 0;
362
363    cxt = bprm->cred->security;
364    BUG_ON(!cxt);
365
366    profile = aa_get_profile(aa_newest_version(cxt->profile));
367    /*
368     * get the namespace from the replacement profile as replacement
369     * can change the namespace
370     */
371    ns = profile->ns;
372    state = profile->file.start;
373
374    /* buffer freed below, name is pointer into buffer */
375    error = aa_get_name(&bprm->file->f_path, profile->path_flags, &buffer,
376                &name);
377    if (error) {
378        if (profile->flags &
379            (PFLAG_IX_ON_NAME_ERROR | PFLAG_UNCONFINED))
380            error = 0;
381        info = "Exec failed name resolution";
382        name = bprm->filename;
383        goto audit;
384    }
385
386    /* Test for onexec first as onexec directives override other
387     * x transitions.
388     */
389    if (unconfined(profile)) {
390        /* unconfined task */
391        if (cxt->onexec)
392            /* change_profile on exec already been granted */
393            new_profile = aa_get_profile(cxt->onexec);
394        else
395            new_profile = find_attach(ns, &ns->base.profiles, name);
396        if (!new_profile)
397            goto cleanup;
398        goto apply;
399    }
400
401    /* find exec permissions for name */
402    state = aa_str_perms(profile->file.dfa, state, name, &cond, &perms);
403    if (cxt->onexec) {
404        struct file_perms cp;
405        info = "change_profile onexec";
406        if (!(perms.allow & AA_MAY_ONEXEC))
407            goto audit;
408
409        /* test if this exec can be paired with change_profile onexec.
410         * onexec permission is linked to exec with a standard pairing
411         * exec\0change_profile
412         */
413        state = aa_dfa_null_transition(profile->file.dfa, state);
414        cp = change_profile_perms(profile, cxt->onexec->ns, name,
415                      AA_MAY_ONEXEC, state);
416
417        if (!(cp.allow & AA_MAY_ONEXEC))
418            goto audit;
419        new_profile = aa_get_profile(aa_newest_version(cxt->onexec));
420        goto apply;
421    }
422
423    if (perms.allow & MAY_EXEC) {
424        /* exec permission determine how to transition */
425        new_profile = x_to_profile(profile, name, perms.xindex);
426        if (!new_profile) {
427            if (perms.xindex & AA_X_INHERIT) {
428                /* (p|c|n)ix - don't change profile but do
429                 * use the newest version, which was picked
430                 * up above when getting profile
431                 */
432                info = "ix fallback";
433                new_profile = aa_get_profile(profile);
434                goto x_clear;
435            } else if (perms.xindex & AA_X_UNCONFINED) {
436                new_profile = aa_get_profile(ns->unconfined);
437                info = "ux fallback";
438            } else {
439                error = -ENOENT;
440                info = "profile not found";
441            }
442        }
443    } else if (COMPLAIN_MODE(profile)) {
444        /* no exec permission - are we in learning mode */
445        new_profile = aa_new_null_profile(profile, 0);
446        if (!new_profile) {
447            error = -ENOMEM;
448            info = "could not create null profile";
449        } else {
450            error = -EACCES;
451            target = new_profile->base.hname;
452        }
453        perms.xindex |= AA_X_UNSAFE;
454    } else
455        /* fail exec */
456        error = -EACCES;
457
458    if (!new_profile)
459        goto audit;
460
461    if (bprm->unsafe & LSM_UNSAFE_SHARE) {
462        /* FIXME: currently don't mediate shared state */
463        ;
464    }
465
466    if (bprm->unsafe & (LSM_UNSAFE_PTRACE | LSM_UNSAFE_PTRACE_CAP)) {
467        error = may_change_ptraced_domain(current, new_profile);
468        if (error) {
469            aa_put_profile(new_profile);
470            goto audit;
471        }
472    }
473
474    /* Determine if secure exec is needed.
475     * Can be at this point for the following reasons:
476     * 1. unconfined switching to confined
477     * 2. confined switching to different confinement
478     * 3. confined switching to unconfined
479     *
480     * Cases 2 and 3 are marked as requiring secure exec
481     * (unless policy specified "unsafe exec")
482     *
483     * bprm->unsafe is used to cache the AA_X_UNSAFE permission
484     * to avoid having to recompute in secureexec
485     */
486    if (!(perms.xindex & AA_X_UNSAFE)) {
487        AA_DEBUG("scrubbing environment variables for %s profile=%s\n",
488             name, new_profile->base.hname);
489        bprm->unsafe |= AA_SECURE_X_NEEDED;
490    }
491apply:
492    target = new_profile->base.hname;
493    /* when transitioning profiles clear unsafe personality bits */
494    bprm->per_clear |= PER_CLEAR_ON_SETID;
495
496x_clear:
497    aa_put_profile(cxt->profile);
498    /* transfer new profile reference will be released when cxt is freed */
499    cxt->profile = new_profile;
500
501    /* clear out all temporary/transitional state from the context */
502    aa_put_profile(cxt->previous);
503    aa_put_profile(cxt->onexec);
504    cxt->previous = NULL;
505    cxt->onexec = NULL;
506    cxt->token = 0;
507
508audit:
509    error = aa_audit_file(profile, &perms, GFP_KERNEL, OP_EXEC, MAY_EXEC,
510                  name, target, cond.uid, info, error);
511
512cleanup:
513    aa_put_profile(profile);
514    kfree(buffer);
515
516    return error;
517}
518
519/**
520 * apparmor_bprm_secureexec - determine if secureexec is needed
521 * @bprm: binprm for exec (NOT NULL)
522 *
523 * Returns: %1 if secureexec is needed else %0
524 */
525int apparmor_bprm_secureexec(struct linux_binprm *bprm)
526{
527    int ret = cap_bprm_secureexec(bprm);
528
529    /* the decision to use secure exec is computed in set_creds
530     * and stored in bprm->unsafe.
531     */
532    if (!ret && (bprm->unsafe & AA_SECURE_X_NEEDED))
533        ret = 1;
534
535    return ret;
536}
537
538/**
539 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
540 * @bprm: binprm for the exec (NOT NULL)
541 */
542void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
543{
544    struct aa_profile *profile = __aa_current_profile();
545    struct aa_task_cxt *new_cxt = bprm->cred->security;
546
547    /* bail out if unconfined or not changing profile */
548    if ((new_cxt->profile == profile) ||
549        (unconfined(new_cxt->profile)))
550        return;
551
552    current->pdeath_signal = 0;
553
554    /* reset soft limits and set hard limits for the new profile */
555    __aa_transition_rlimits(profile, new_cxt->profile);
556}
557
558/**
559 * apparmor_bprm_commited_cred - do cleanup after new creds committed
560 * @bprm: binprm for the exec (NOT NULL)
561 */
562void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
563{
564    /* TODO: cleanup signals - ipc mediation */
565    return;
566}
567
568/*
569 * Functions for self directed profile change
570 */
571
572/**
573 * new_compound_name - create an hname with @n2 appended to @n1
574 * @n1: base of hname (NOT NULL)
575 * @n2: name to append (NOT NULL)
576 *
577 * Returns: new name or NULL on error
578 */
579static char *new_compound_name(const char *n1, const char *n2)
580{
581    char *name = kmalloc(strlen(n1) + strlen(n2) + 3, GFP_KERNEL);
582    if (name)
583        sprintf(name, "%s//%s", n1, n2);
584    return name;
585}
586
587/**
588 * aa_change_hat - change hat to/from subprofile
589 * @hats: vector of hat names to try changing into (MAYBE NULL if @count == 0)
590 * @count: number of hat names in @hats
591 * @token: magic value to validate the hat change
592 * @permtest: true if this is just a permission test
593 *
594 * Change to the first profile specified in @hats that exists, and store
595 * the @hat_magic in the current task context. If the count == 0 and the
596 * @token matches that stored in the current task context, return to the
597 * top level profile.
598 *
599 * Returns %0 on success, error otherwise.
600 */
601int aa_change_hat(const char *hats[], int count, u64 token, bool permtest)
602{
603    const struct cred *cred;
604    struct aa_task_cxt *cxt;
605    struct aa_profile *profile, *previous_profile, *hat = NULL;
606    char *name = NULL;
607    int i;
608    struct file_perms perms = {};
609    const char *target = NULL, *info = NULL;
610    int error = 0;
611
612    /* released below */
613    cred = get_current_cred();
614    cxt = cred->security;
615    profile = aa_cred_profile(cred);
616    previous_profile = cxt->previous;
617
618    if (unconfined(profile)) {
619        info = "unconfined";
620        error = -EPERM;
621        goto audit;
622    }
623
624    if (count) {
625        /* attempting to change into a new hat or switch to a sibling */
626        struct aa_profile *root;
627        root = PROFILE_IS_HAT(profile) ? profile->parent : profile;
628
629        /* find first matching hat */
630        for (i = 0; i < count && !hat; i++)
631            /* released below */
632            hat = aa_find_child(root, hats[i]);
633        if (!hat) {
634            if (!COMPLAIN_MODE(root) || permtest) {
635                if (list_empty(&root->base.profiles))
636                    error = -ECHILD;
637                else
638                    error = -ENOENT;
639                goto out;
640            }
641
642            /*
643             * In complain mode and failed to match any hats.
644             * Audit the failure is based off of the first hat
645             * supplied. This is done due how userspace
646             * interacts with change_hat.
647             *
648             * TODO: Add logging of all failed hats
649             */
650
651            /* freed below */
652            name = new_compound_name(root->base.hname, hats[0]);
653            target = name;
654            /* released below */
655            hat = aa_new_null_profile(profile, 1);
656            if (!hat) {
657                info = "failed null profile create";
658                error = -ENOMEM;
659                goto audit;
660            }
661        } else {
662            target = hat->base.hname;
663            if (!PROFILE_IS_HAT(hat)) {
664                info = "target not hat";
665                error = -EPERM;
666                goto audit;
667            }
668        }
669
670        error = may_change_ptraced_domain(current, hat);
671        if (error) {
672            info = "ptraced";
673            error = -EPERM;
674            goto audit;
675        }
676
677        if (!permtest) {
678            error = aa_set_current_hat(hat, token);
679            if (error == -EACCES)
680                /* kill task in case of brute force attacks */
681                perms.kill = AA_MAY_CHANGEHAT;
682            else if (name && !error)
683                /* reset error for learning of new hats */
684                error = -ENOENT;
685        }
686    } else if (previous_profile) {
687        /* Return to saved profile. Kill task if restore fails
688         * to avoid brute force attacks
689         */
690        target = previous_profile->base.hname;
691        error = aa_restore_previous_profile(token);
692        perms.kill = AA_MAY_CHANGEHAT;
693    } else
694        /* ignore restores when there is no saved profile */
695        goto out;
696
697audit:
698    if (!permtest)
699        error = aa_audit_file(profile, &perms, GFP_KERNEL,
700                      OP_CHANGE_HAT, AA_MAY_CHANGEHAT, NULL,
701                      target, 0, info, error);
702
703out:
704    aa_put_profile(hat);
705    kfree(name);
706    put_cred(cred);
707
708    return error;
709}
710
711/**
712 * aa_change_profile - perform a one-way profile transition
713 * @ns_name: name of the profile namespace to change to (MAYBE NULL)
714 * @hname: name of profile to change to (MAYBE NULL)
715 * @onexec: whether this transition is to take place immediately or at exec
716 * @permtest: true if this is just a permission test
717 *
718 * Change to new profile @name. Unlike with hats, there is no way
719 * to change back. If @name isn't specified the current profile name is
720 * used.
721 * If @onexec then the transition is delayed until
722 * the next exec.
723 *
724 * Returns %0 on success, error otherwise.
725 */
726int aa_change_profile(const char *ns_name, const char *hname, bool onexec,
727              bool permtest)
728{
729    const struct cred *cred;
730    struct aa_task_cxt *cxt;
731    struct aa_profile *profile, *target = NULL;
732    struct aa_namespace *ns = NULL;
733    struct file_perms perms = {};
734    const char *name = NULL, *info = NULL;
735    int op, error = 0;
736    u32 request;
737
738    if (!hname && !ns_name)
739        return -EINVAL;
740
741    if (onexec) {
742        request = AA_MAY_ONEXEC;
743        op = OP_CHANGE_ONEXEC;
744    } else {
745        request = AA_MAY_CHANGE_PROFILE;
746        op = OP_CHANGE_PROFILE;
747    }
748
749    cred = get_current_cred();
750    cxt = cred->security;
751    profile = aa_cred_profile(cred);
752
753    if (ns_name) {
754        /* released below */
755        ns = aa_find_namespace(profile->ns, ns_name);
756        if (!ns) {
757            /* we don't create new namespace in complain mode */
758            name = ns_name;
759            info = "namespace not found";
760            error = -ENOENT;
761            goto audit;
762        }
763    } else
764        /* released below */
765        ns = aa_get_namespace(profile->ns);
766
767    /* if the name was not specified, use the name of the current profile */
768    if (!hname) {
769        if (unconfined(profile))
770            hname = ns->unconfined->base.hname;
771        else
772            hname = profile->base.hname;
773    }
774
775    perms = change_profile_perms(profile, ns, hname, request,
776                     profile->file.start);
777    if (!(perms.allow & request)) {
778        error = -EACCES;
779        goto audit;
780    }
781
782    /* released below */
783    target = aa_lookup_profile(ns, hname);
784    if (!target) {
785        info = "profile not found";
786        error = -ENOENT;
787        if (permtest || !COMPLAIN_MODE(profile))
788            goto audit;
789        /* released below */
790        target = aa_new_null_profile(profile, 0);
791        if (!target) {
792            info = "failed null profile create";
793            error = -ENOMEM;
794            goto audit;
795        }
796    }
797
798    /* check if tracing task is allowed to trace target domain */
799    error = may_change_ptraced_domain(current, target);
800    if (error) {
801        info = "ptrace prevents transition";
802        goto audit;
803    }
804
805    if (permtest)
806        goto audit;
807
808    if (onexec)
809        error = aa_set_current_onexec(target);
810    else
811        error = aa_replace_current_profile(target);
812
813audit:
814    if (!permtest)
815        error = aa_audit_file(profile, &perms, GFP_KERNEL, op, request,
816                      name, hname, 0, info, error);
817
818    aa_put_namespace(ns);
819    aa_put_profile(target);
820    put_cred(cred);
821
822    return error;
823}
824

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