2 * AppArmor security module
4 * This file contains AppArmor LSM hooks.
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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
15 #include <linux/lsm_hooks.h>
16 #include <linux/moduleparam.h>
18 #include <linux/mman.h>
19 #include <linux/mount.h>
20 #include <linux/namei.h>
21 #include <linux/ptrace.h>
22 #include <linux/ctype.h>
23 #include <linux/sysctl.h>
24 #include <linux/audit.h>
25 #include <linux/user_namespace.h>
26 #include <linux/kmemleak.h>
29 #include "include/apparmor.h"
30 #include "include/apparmorfs.h"
31 #include "include/audit.h"
32 #include "include/capability.h"
33 #include "include/context.h"
34 #include "include/file.h"
35 #include "include/ipc.h"
36 #include "include/path.h"
37 #include "include/label.h"
38 #include "include/policy.h"
39 #include "include/policy_ns.h"
40 #include "include/procattr.h"
42 /* Flag indicating whether initialization completed */
43 int apparmor_initialized;
45 DEFINE_PER_CPU(struct aa_buffers, aa_buffers);
53 * free the associated aa_task_ctx and put its labels
55 static void apparmor_cred_free(struct cred *cred)
57 aa_free_task_context(cred_ctx(cred));
58 cred_ctx(cred) = NULL;
62 * allocate the apparmor part of blank credentials
64 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
66 /* freed by apparmor_cred_free */
67 struct aa_task_ctx *ctx = aa_alloc_task_context(gfp);
77 * prepare new aa_task_ctx for modification by prepare_cred block
79 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
82 /* freed by apparmor_cred_free */
83 struct aa_task_ctx *ctx = aa_alloc_task_context(gfp);
88 aa_dup_task_context(ctx, cred_ctx(old));
94 * transfer the apparmor data to a blank set of creds
96 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
98 const struct aa_task_ctx *old_ctx = cred_ctx(old);
99 struct aa_task_ctx *new_ctx = cred_ctx(new);
101 aa_dup_task_context(new_ctx, old_ctx);
104 static int apparmor_ptrace_access_check(struct task_struct *child,
107 struct aa_label *tracer, *tracee;
110 tracer = begin_current_label_crit_section();
111 tracee = aa_get_task_label(child);
112 error = aa_may_ptrace(tracer, tracee,
113 mode == PTRACE_MODE_READ ? AA_PTRACE_READ : AA_PTRACE_TRACE);
114 aa_put_label(tracee);
115 end_current_label_crit_section(tracer);
120 static int apparmor_ptrace_traceme(struct task_struct *parent)
122 struct aa_label *tracer, *tracee;
125 tracee = begin_current_label_crit_section();
126 tracer = aa_get_task_label(parent);
127 error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
128 aa_put_label(tracer);
129 end_current_label_crit_section(tracee);
134 /* Derived from security/commoncap.c:cap_capget */
135 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
136 kernel_cap_t *inheritable, kernel_cap_t *permitted)
138 struct aa_label *label;
139 const struct cred *cred;
142 cred = __task_cred(target);
143 label = aa_get_newest_cred_label(cred);
146 * cap_capget is stacked ahead of this and will
147 * initialize effective and permitted.
149 if (!unconfined(label)) {
150 struct aa_profile *profile;
153 label_for_each_confined(i, label, profile) {
154 if (COMPLAIN_MODE(profile))
156 *effective = cap_intersect(*effective,
157 profile->caps.allow);
158 *permitted = cap_intersect(*permitted,
159 profile->caps.allow);
168 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
171 struct aa_label *label;
174 label = aa_get_newest_cred_label(cred);
175 if (!unconfined(label))
176 error = aa_capable(label, cap, audit);
183 * common_perm - basic common permission check wrapper fn for paths
184 * @op: operation being checked
185 * @path: path to check permission of (NOT NULL)
186 * @mask: requested permissions mask
187 * @cond: conditional info for the permission request (NOT NULL)
189 * Returns: %0 else error code if error or permission denied
191 static int common_perm(const char *op, const struct path *path, u32 mask,
192 struct path_cond *cond)
194 struct aa_label *label;
197 label = __begin_current_label_crit_section();
198 if (!unconfined(label))
199 error = aa_path_perm(op, label, path, 0, mask, cond);
200 __end_current_label_crit_section(label);
206 * common_perm_cond - common permission wrapper around inode cond
207 * @op: operation being checked
208 * @path: location to check (NOT NULL)
209 * @mask: requested permissions mask
211 * Returns: %0 else error code if error or permission denied
213 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
215 struct path_cond cond = { d_backing_inode(path->dentry)->i_uid,
216 d_backing_inode(path->dentry)->i_mode
219 if (!path_mediated_fs(path->dentry))
222 return common_perm(op, path, mask, &cond);
226 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
227 * @op: operation being checked
228 * @dir: directory of the dentry (NOT NULL)
229 * @dentry: dentry to check (NOT NULL)
230 * @mask: requested permissions mask
231 * @cond: conditional info for the permission request (NOT NULL)
233 * Returns: %0 else error code if error or permission denied
235 static int common_perm_dir_dentry(const char *op, const struct path *dir,
236 struct dentry *dentry, u32 mask,
237 struct path_cond *cond)
239 struct path path = { .mnt = dir->mnt, .dentry = dentry };
241 return common_perm(op, &path, mask, cond);
245 * common_perm_rm - common permission wrapper for operations doing rm
246 * @op: operation being checked
247 * @dir: directory that the dentry is in (NOT NULL)
248 * @dentry: dentry being rm'd (NOT NULL)
249 * @mask: requested permission mask
251 * Returns: %0 else error code if error or permission denied
253 static int common_perm_rm(const char *op, const struct path *dir,
254 struct dentry *dentry, u32 mask)
256 struct inode *inode = d_backing_inode(dentry);
257 struct path_cond cond = { };
259 if (!inode || !path_mediated_fs(dentry))
262 cond.uid = inode->i_uid;
263 cond.mode = inode->i_mode;
265 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
269 * common_perm_create - common permission wrapper for operations doing create
270 * @op: operation being checked
271 * @dir: directory that dentry will be created in (NOT NULL)
272 * @dentry: dentry to create (NOT NULL)
273 * @mask: request permission mask
274 * @mode: created file mode
276 * Returns: %0 else error code if error or permission denied
278 static int common_perm_create(const char *op, const struct path *dir,
279 struct dentry *dentry, u32 mask, umode_t mode)
281 struct path_cond cond = { current_fsuid(), mode };
283 if (!path_mediated_fs(dir->dentry))
286 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
289 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
291 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
294 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
297 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
301 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
303 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
306 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
307 umode_t mode, unsigned int dev)
309 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
312 static int apparmor_path_truncate(const struct path *path)
314 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
317 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
318 const char *old_name)
320 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
324 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
325 struct dentry *new_dentry)
327 struct aa_label *label;
330 if (!path_mediated_fs(old_dentry))
333 label = begin_current_label_crit_section();
334 if (!unconfined(label))
335 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
336 end_current_label_crit_section(label);
341 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
342 const struct path *new_dir, struct dentry *new_dentry)
344 struct aa_label *label;
347 if (!path_mediated_fs(old_dentry))
350 label = begin_current_label_crit_section();
351 if (!unconfined(label)) {
352 struct path old_path = { .mnt = old_dir->mnt,
353 .dentry = old_dentry };
354 struct path new_path = { .mnt = new_dir->mnt,
355 .dentry = new_dentry };
356 struct path_cond cond = { d_backing_inode(old_dentry)->i_uid,
357 d_backing_inode(old_dentry)->i_mode
360 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
361 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
362 AA_MAY_SETATTR | AA_MAY_DELETE,
365 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
366 0, MAY_WRITE | AA_MAY_SETATTR |
367 AA_MAY_CREATE, &cond);
370 end_current_label_crit_section(label);
375 static int apparmor_path_chmod(const struct path *path, umode_t mode)
377 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
380 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
382 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
385 static int apparmor_inode_getattr(const struct path *path)
387 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
390 static int apparmor_file_open(struct file *file, const struct cred *cred)
392 struct aa_file_ctx *fctx = file_ctx(file);
393 struct aa_label *label;
396 if (!path_mediated_fs(file->f_path.dentry))
399 /* If in exec, permission is handled by bprm hooks.
400 * Cache permissions granted by the previous exec check, with
401 * implicit read and executable mmap which are required to
402 * actually execute the image.
404 if (current->in_execve) {
405 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
409 label = aa_get_newest_cred_label(cred);
410 if (!unconfined(label)) {
411 struct inode *inode = file_inode(file);
412 struct path_cond cond = { inode->i_uid, inode->i_mode };
414 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
415 aa_map_file_to_perms(file), &cond);
416 /* todo cache full allowed permissions set and state */
417 fctx->allow = aa_map_file_to_perms(file);
424 static int apparmor_file_alloc_security(struct file *file)
428 /* freed by apparmor_file_free_security */
429 struct aa_label *label = begin_current_label_crit_section();
430 file->f_security = aa_alloc_file_ctx(label, GFP_KERNEL);
433 end_current_label_crit_section(label);
438 static void apparmor_file_free_security(struct file *file)
440 aa_free_file_ctx(file_ctx(file));
443 static int common_file_perm(const char *op, struct file *file, u32 mask)
445 struct aa_label *label;
448 /* don't reaudit files closed during inheritance */
449 if (file->f_path.dentry == aa_null.dentry)
452 label = __begin_current_label_crit_section();
453 error = aa_file_perm(op, label, file, mask);
454 __end_current_label_crit_section(label);
459 static int apparmor_file_receive(struct file *file)
461 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file));
464 static int apparmor_file_permission(struct file *file, int mask)
466 return common_file_perm(OP_FPERM, file, mask);
469 static int apparmor_file_lock(struct file *file, unsigned int cmd)
471 u32 mask = AA_MAY_LOCK;
476 return common_file_perm(OP_FLOCK, file, mask);
479 static int common_mmap(const char *op, struct file *file, unsigned long prot,
484 if (!file || !file_ctx(file))
487 if (prot & PROT_READ)
490 * Private mappings don't require write perms since they don't
491 * write back to the files
493 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
495 if (prot & PROT_EXEC)
496 mask |= AA_EXEC_MMAP;
498 return common_file_perm(op, file, mask);
501 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
502 unsigned long prot, unsigned long flags)
504 return common_mmap(OP_FMMAP, file, prot, flags);
507 static int apparmor_file_mprotect(struct vm_area_struct *vma,
508 unsigned long reqprot, unsigned long prot)
510 return common_mmap(OP_FMPROT, vma->vm_file, prot,
511 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
514 static int apparmor_getprocattr(struct task_struct *task, char *name,
519 const struct cred *cred = get_task_cred(task);
520 struct aa_task_ctx *ctx = cred_ctx(cred);
521 struct aa_label *label = NULL;
523 if (strcmp(name, "current") == 0)
524 label = aa_get_newest_label(ctx->label);
525 else if (strcmp(name, "prev") == 0 && ctx->previous)
526 label = aa_get_newest_label(ctx->previous);
527 else if (strcmp(name, "exec") == 0 && ctx->onexec)
528 label = aa_get_newest_label(ctx->onexec);
533 error = aa_getprocattr(label, value);
541 static int apparmor_setprocattr(const char *name, void *value,
544 char *command, *largs = NULL, *args = value;
547 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
552 /* AppArmor requires that the buffer must be null terminated atm */
553 if (args[size - 1] != '\0') {
555 largs = args = kmalloc(size + 1, GFP_KERNEL);
558 memcpy(args, value, size);
564 command = strsep(&args, " ");
567 args = skip_spaces(args);
571 arg_size = size - (args - (largs ? largs : (char *) value));
572 if (strcmp(name, "current") == 0) {
573 if (strcmp(command, "changehat") == 0) {
574 error = aa_setprocattr_changehat(args, arg_size,
576 } else if (strcmp(command, "permhat") == 0) {
577 error = aa_setprocattr_changehat(args, arg_size,
579 } else if (strcmp(command, "changeprofile") == 0) {
580 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
581 } else if (strcmp(command, "permprofile") == 0) {
582 error = aa_change_profile(args, AA_CHANGE_TEST);
583 } else if (strcmp(command, "stack") == 0) {
584 error = aa_change_profile(args, AA_CHANGE_STACK);
587 } else if (strcmp(name, "exec") == 0) {
588 if (strcmp(command, "exec") == 0)
589 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
590 else if (strcmp(command, "stack") == 0)
591 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
596 /* only support the "current" and "exec" process attributes */
606 aad(&sa)->label = begin_current_label_crit_section();
607 aad(&sa)->info = name;
608 aad(&sa)->error = error = -EINVAL;
609 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
610 end_current_label_crit_section(aad(&sa)->label);
615 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
616 * @bprm: binprm for the exec (NOT NULL)
618 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
620 struct aa_label *label = aa_current_raw_label();
621 struct aa_task_ctx *new_ctx = cred_ctx(bprm->cred);
623 /* bail out if unconfined or not changing profile */
624 if ((new_ctx->label->proxy == label->proxy) ||
625 (unconfined(new_ctx->label)))
628 aa_inherit_files(bprm->cred, current->files);
630 current->pdeath_signal = 0;
632 /* reset soft limits and set hard limits for the new label */
633 __aa_transition_rlimits(label, new_ctx->label);
637 * apparmor_bprm_committed_cred - do cleanup after new creds committed
638 * @bprm: binprm for the exec (NOT NULL)
640 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
642 /* TODO: cleanup signals - ipc mediation */
646 static int apparmor_task_setrlimit(struct task_struct *task,
647 unsigned int resource, struct rlimit *new_rlim)
649 struct aa_label *label = __begin_current_label_crit_section();
652 if (!unconfined(label))
653 error = aa_task_setrlimit(label, task, resource, new_rlim);
654 __end_current_label_crit_section(label);
659 static int apparmor_task_kill(struct task_struct *target, struct siginfo *info,
662 struct aa_label *cl, *tl;
666 /* TODO: after secid to label mapping is done.
667 * Dealing with USB IO specific behavior
670 cl = __begin_current_label_crit_section();
671 tl = aa_get_task_label(target);
672 error = aa_may_signal(cl, tl, sig);
674 __end_current_label_crit_section(cl);
679 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
680 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
681 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
682 LSM_HOOK_INIT(capget, apparmor_capget),
683 LSM_HOOK_INIT(capable, apparmor_capable),
685 LSM_HOOK_INIT(path_link, apparmor_path_link),
686 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
687 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
688 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
689 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
690 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
691 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
692 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
693 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
694 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
695 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
697 LSM_HOOK_INIT(file_open, apparmor_file_open),
698 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
699 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
700 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
701 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
702 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
703 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
704 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
706 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
707 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
709 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
710 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
711 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
712 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
714 LSM_HOOK_INIT(bprm_set_creds, apparmor_bprm_set_creds),
715 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
716 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
717 LSM_HOOK_INIT(bprm_secureexec, apparmor_bprm_secureexec),
719 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
720 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
724 * AppArmor sysfs module parameters
727 static int param_set_aabool(const char *val, const struct kernel_param *kp);
728 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
729 #define param_check_aabool param_check_bool
730 static const struct kernel_param_ops param_ops_aabool = {
731 .flags = KERNEL_PARAM_OPS_FL_NOARG,
732 .set = param_set_aabool,
733 .get = param_get_aabool
736 static int param_set_aauint(const char *val, const struct kernel_param *kp);
737 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
738 #define param_check_aauint param_check_uint
739 static const struct kernel_param_ops param_ops_aauint = {
740 .set = param_set_aauint,
741 .get = param_get_aauint
744 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
745 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
746 #define param_check_aalockpolicy param_check_bool
747 static const struct kernel_param_ops param_ops_aalockpolicy = {
748 .flags = KERNEL_PARAM_OPS_FL_NOARG,
749 .set = param_set_aalockpolicy,
750 .get = param_get_aalockpolicy
753 static int param_set_audit(const char *val, struct kernel_param *kp);
754 static int param_get_audit(char *buffer, struct kernel_param *kp);
756 static int param_set_mode(const char *val, struct kernel_param *kp);
757 static int param_get_mode(char *buffer, struct kernel_param *kp);
759 /* Flag values, also controllable via /sys/module/apparmor/parameters
760 * We define special types as we want to do additional mediation.
763 /* AppArmor global enforcement switch - complain, enforce, kill */
764 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
765 module_param_call(mode, param_set_mode, param_get_mode,
766 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
768 /* whether policy verification hashing is enabled */
769 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
770 #ifdef CONFIG_SECURITY_APPARMOR_HASH
771 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
775 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
776 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
779 enum audit_mode aa_g_audit;
780 module_param_call(audit, param_set_audit, param_get_audit,
781 &aa_g_audit, S_IRUSR | S_IWUSR);
783 /* Determines if audit header is included in audited messages. This
784 * provides more context if the audit daemon is not running
786 bool aa_g_audit_header = 1;
787 module_param_named(audit_header, aa_g_audit_header, aabool,
790 /* lock out loading/removal of policy
791 * TODO: add in at boot loading of policy, which is the only way to
792 * load policy, if lock_policy is set
794 bool aa_g_lock_policy;
795 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
798 /* Syscall logging mode */
799 bool aa_g_logsyscall;
800 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
802 /* Maximum pathname length before accesses will start getting rejected */
803 unsigned int aa_g_path_max = 2 * PATH_MAX;
804 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
806 /* Determines how paranoid loading of policy is and how much verification
807 * on the loaded policy is done.
808 * DEPRECATED: read only as strict checking of load is always done now
809 * that none root users (user namespaces) can load policy.
811 bool aa_g_paranoid_load = 1;
812 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
814 /* Boot time disable flag */
815 static bool apparmor_enabled = CONFIG_SECURITY_APPARMOR_BOOTPARAM_VALUE;
816 module_param_named(enabled, apparmor_enabled, bool, S_IRUGO);
818 static int __init apparmor_enabled_setup(char *str)
820 unsigned long enabled;
821 int error = kstrtoul(str, 0, &enabled);
823 apparmor_enabled = enabled ? 1 : 0;
827 __setup("apparmor=", apparmor_enabled_setup);
829 /* set global flag turning off the ability to load policy */
830 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
832 if (!apparmor_enabled)
834 if (apparmor_initialized && !policy_admin_capable(NULL))
836 return param_set_bool(val, kp);
839 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
841 if (!apparmor_enabled)
843 if (apparmor_initialized && !policy_view_capable(NULL))
845 return param_get_bool(buffer, kp);
848 static int param_set_aabool(const char *val, const struct kernel_param *kp)
850 if (!apparmor_enabled)
852 if (apparmor_initialized && !policy_admin_capable(NULL))
854 return param_set_bool(val, kp);
857 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
859 if (!apparmor_enabled)
861 if (apparmor_initialized && !policy_view_capable(NULL))
863 return param_get_bool(buffer, kp);
866 static int param_set_aauint(const char *val, const struct kernel_param *kp)
870 if (!apparmor_enabled)
872 /* file is ro but enforce 2nd line check */
873 if (apparmor_initialized)
876 error = param_set_uint(val, kp);
877 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
882 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
884 if (!apparmor_enabled)
886 if (apparmor_initialized && !policy_view_capable(NULL))
888 return param_get_uint(buffer, kp);
891 static int param_get_audit(char *buffer, struct kernel_param *kp)
893 if (!apparmor_enabled)
895 if (apparmor_initialized && !policy_view_capable(NULL))
897 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
900 static int param_set_audit(const char *val, struct kernel_param *kp)
904 if (!apparmor_enabled)
908 if (apparmor_initialized && !policy_admin_capable(NULL))
911 for (i = 0; i < AUDIT_MAX_INDEX; i++) {
912 if (strcmp(val, audit_mode_names[i]) == 0) {
921 static int param_get_mode(char *buffer, struct kernel_param *kp)
923 if (!apparmor_enabled)
925 if (apparmor_initialized && !policy_view_capable(NULL))
928 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
931 static int param_set_mode(const char *val, struct kernel_param *kp)
935 if (!apparmor_enabled)
939 if (apparmor_initialized && !policy_admin_capable(NULL))
942 for (i = 0; i < APPARMOR_MODE_NAMES_MAX_INDEX; i++) {
943 if (strcmp(val, aa_profile_mode_names[i]) == 0) {
944 aa_g_profile_mode = i;
953 * AppArmor init functions
957 * set_init_ctx - set a task context and profile on the first task.
959 * TODO: allow setting an alternate profile than unconfined
961 static int __init set_init_ctx(void)
963 struct cred *cred = (struct cred *)current->real_cred;
964 struct aa_task_ctx *ctx;
966 ctx = aa_alloc_task_context(GFP_KERNEL);
970 ctx->label = aa_get_label(ns_unconfined(root_ns));
971 cred_ctx(cred) = ctx;
976 static void destroy_buffers(void)
980 for_each_possible_cpu(i) {
981 for_each_cpu_buffer(j) {
982 kfree(per_cpu(aa_buffers, i).buf[j]);
983 per_cpu(aa_buffers, i).buf[j] = NULL;
988 static int __init alloc_buffers(void)
992 for_each_possible_cpu(i) {
993 for_each_cpu_buffer(j) {
996 if (cpu_to_node(i) > num_online_nodes())
997 /* fallback to kmalloc for offline nodes */
998 buffer = kmalloc(aa_g_path_max, GFP_KERNEL);
1000 buffer = kmalloc_node(aa_g_path_max, GFP_KERNEL,
1006 per_cpu(aa_buffers, i).buf[j] = buffer;
1013 #ifdef CONFIG_SYSCTL
1014 static int apparmor_dointvec(struct ctl_table *table, int write,
1015 void __user *buffer, size_t *lenp, loff_t *ppos)
1017 if (!policy_admin_capable(NULL))
1019 if (!apparmor_enabled)
1022 return proc_dointvec(table, write, buffer, lenp, ppos);
1025 static struct ctl_path apparmor_sysctl_path[] = {
1026 { .procname = "kernel", },
1030 static struct ctl_table apparmor_sysctl_table[] = {
1032 .procname = "unprivileged_userns_apparmor_policy",
1033 .data = &unprivileged_userns_apparmor_policy,
1034 .maxlen = sizeof(int),
1036 .proc_handler = apparmor_dointvec,
1041 static int __init apparmor_init_sysctl(void)
1043 return register_sysctl_paths(apparmor_sysctl_path,
1044 apparmor_sysctl_table) ? 0 : -ENOMEM;
1047 static inline int apparmor_init_sysctl(void)
1051 #endif /* CONFIG_SYSCTL */
1053 static int __init apparmor_init(void)
1057 if (!apparmor_enabled || !security_module_enable("apparmor")) {
1058 aa_info_message("AppArmor disabled by boot time parameter");
1059 apparmor_enabled = 0;
1063 error = aa_setup_dfa_engine();
1065 AA_ERROR("Unable to setup dfa engine\n");
1069 error = aa_alloc_root_ns();
1071 AA_ERROR("Unable to allocate default profile namespace\n");
1075 error = apparmor_init_sysctl();
1077 AA_ERROR("Unable to register sysctls\n");
1082 error = alloc_buffers();
1084 AA_ERROR("Unable to allocate work buffers\n");
1088 error = set_init_ctx();
1090 AA_ERROR("Failed to set context on init task\n");
1094 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1097 /* Report that AppArmor successfully initialized */
1098 apparmor_initialized = 1;
1099 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1100 aa_info_message("AppArmor initialized: complain mode enabled");
1101 else if (aa_g_profile_mode == APPARMOR_KILL)
1102 aa_info_message("AppArmor initialized: kill mode enabled");
1104 aa_info_message("AppArmor initialized");
1113 aa_teardown_dfa_engine();
1115 apparmor_enabled = 0;
1119 security_initcall(apparmor_init);