1 // SPDX-License-Identifier: GPL-2.0-only
3 * AppArmor security module
5 * This file contains AppArmor LSM hooks.
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
11 #include <linux/lsm_hooks.h>
12 #include <linux/moduleparam.h>
14 #include <linux/mman.h>
15 #include <linux/mount.h>
16 #include <linux/namei.h>
17 #include <linux/ptrace.h>
18 #include <linux/ctype.h>
19 #include <linux/sysctl.h>
20 #include <linux/audit.h>
21 #include <linux/user_namespace.h>
22 #include <linux/netfilter_ipv4.h>
23 #include <linux/netfilter_ipv6.h>
24 #include <linux/zlib.h>
26 #include <uapi/linux/mount.h>
28 #include "include/apparmor.h"
29 #include "include/apparmorfs.h"
30 #include "include/audit.h"
31 #include "include/capability.h"
32 #include "include/cred.h"
33 #include "include/file.h"
34 #include "include/ipc.h"
35 #include "include/net.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"
41 #include "include/mount.h"
42 #include "include/secid.h"
44 /* Flag indicating whether initialization completed */
45 int apparmor_initialized;
48 struct list_head list;
52 #define RESERVE_COUNT 2
53 static int reserve_count = RESERVE_COUNT;
54 static int buffer_count;
56 static LIST_HEAD(aa_global_buffers);
57 static DEFINE_SPINLOCK(aa_buffers_lock);
64 * put the associated labels
66 static void apparmor_cred_free(struct cred *cred)
68 aa_put_label(cred_label(cred));
69 set_cred_label(cred, NULL);
73 * allocate the apparmor part of blank credentials
75 static int apparmor_cred_alloc_blank(struct cred *cred, gfp_t gfp)
77 set_cred_label(cred, NULL);
82 * prepare new cred label for modification by prepare_cred block
84 static int apparmor_cred_prepare(struct cred *new, const struct cred *old,
87 set_cred_label(new, aa_get_newest_label(cred_label(old)));
92 * transfer the apparmor data to a blank set of creds
94 static void apparmor_cred_transfer(struct cred *new, const struct cred *old)
96 set_cred_label(new, aa_get_newest_label(cred_label(old)));
99 static void apparmor_task_free(struct task_struct *task)
102 aa_free_task_ctx(task_ctx(task));
105 static int apparmor_task_alloc(struct task_struct *task,
106 unsigned long clone_flags)
108 struct aa_task_ctx *new = task_ctx(task);
110 aa_dup_task_ctx(new, task_ctx(current));
115 static int apparmor_ptrace_access_check(struct task_struct *child,
118 struct aa_label *tracer, *tracee;
121 tracer = __begin_current_label_crit_section();
122 tracee = aa_get_task_label(child);
123 error = aa_may_ptrace(tracer, tracee,
124 (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
126 aa_put_label(tracee);
127 __end_current_label_crit_section(tracer);
132 static int apparmor_ptrace_traceme(struct task_struct *parent)
134 struct aa_label *tracer, *tracee;
137 tracee = __begin_current_label_crit_section();
138 tracer = aa_get_task_label(parent);
139 error = aa_may_ptrace(tracer, tracee, AA_PTRACE_TRACE);
140 aa_put_label(tracer);
141 __end_current_label_crit_section(tracee);
146 /* Derived from security/commoncap.c:cap_capget */
147 static int apparmor_capget(struct task_struct *target, kernel_cap_t *effective,
148 kernel_cap_t *inheritable, kernel_cap_t *permitted)
150 struct aa_label *label;
151 const struct cred *cred;
154 cred = __task_cred(target);
155 label = aa_get_newest_cred_label(cred);
158 * cap_capget is stacked ahead of this and will
159 * initialize effective and permitted.
161 if (!unconfined(label)) {
162 struct aa_profile *profile;
165 label_for_each_confined(i, label, profile) {
166 if (COMPLAIN_MODE(profile))
168 *effective = cap_intersect(*effective,
169 profile->caps.allow);
170 *permitted = cap_intersect(*permitted,
171 profile->caps.allow);
180 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
181 int cap, unsigned int opts)
183 struct aa_label *label;
186 label = aa_get_newest_cred_label(cred);
187 if (!unconfined(label))
188 error = aa_capable(label, cap, opts);
195 * common_perm - basic common permission check wrapper fn for paths
196 * @op: operation being checked
197 * @path: path to check permission of (NOT NULL)
198 * @mask: requested permissions mask
199 * @cond: conditional info for the permission request (NOT NULL)
201 * Returns: %0 else error code if error or permission denied
203 static int common_perm(const char *op, const struct path *path, u32 mask,
204 struct path_cond *cond)
206 struct aa_label *label;
209 label = __begin_current_label_crit_section();
210 if (!unconfined(label))
211 error = aa_path_perm(op, label, path, 0, mask, cond);
212 __end_current_label_crit_section(label);
218 * common_perm_cond - common permission wrapper around inode cond
219 * @op: operation being checked
220 * @path: location to check (NOT NULL)
221 * @mask: requested permissions mask
223 * Returns: %0 else error code if error or permission denied
225 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
227 struct user_namespace *mnt_userns = mnt_user_ns(path->mnt);
228 struct path_cond cond = {
229 i_uid_into_mnt(mnt_userns, d_backing_inode(path->dentry)),
230 d_backing_inode(path->dentry)->i_mode
233 if (!path_mediated_fs(path->dentry))
236 return common_perm(op, path, mask, &cond);
240 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
241 * @op: operation being checked
242 * @dir: directory of the dentry (NOT NULL)
243 * @dentry: dentry to check (NOT NULL)
244 * @mask: requested permissions mask
245 * @cond: conditional info for the permission request (NOT NULL)
247 * Returns: %0 else error code if error or permission denied
249 static int common_perm_dir_dentry(const char *op, const struct path *dir,
250 struct dentry *dentry, u32 mask,
251 struct path_cond *cond)
253 struct path path = { .mnt = dir->mnt, .dentry = dentry };
255 return common_perm(op, &path, mask, cond);
259 * common_perm_rm - common permission wrapper for operations doing rm
260 * @op: operation being checked
261 * @dir: directory that the dentry is in (NOT NULL)
262 * @dentry: dentry being rm'd (NOT NULL)
263 * @mask: requested permission mask
265 * Returns: %0 else error code if error or permission denied
267 static int common_perm_rm(const char *op, const struct path *dir,
268 struct dentry *dentry, u32 mask)
270 struct inode *inode = d_backing_inode(dentry);
271 struct user_namespace *mnt_userns = mnt_user_ns(dir->mnt);
272 struct path_cond cond = { };
274 if (!inode || !path_mediated_fs(dentry))
277 cond.uid = i_uid_into_mnt(mnt_userns, inode);
278 cond.mode = inode->i_mode;
280 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
284 * common_perm_create - common permission wrapper for operations doing create
285 * @op: operation being checked
286 * @dir: directory that dentry will be created in (NOT NULL)
287 * @dentry: dentry to create (NOT NULL)
288 * @mask: request permission mask
289 * @mode: created file mode
291 * Returns: %0 else error code if error or permission denied
293 static int common_perm_create(const char *op, const struct path *dir,
294 struct dentry *dentry, u32 mask, umode_t mode)
296 struct path_cond cond = { current_fsuid(), mode };
298 if (!path_mediated_fs(dir->dentry))
301 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
304 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
306 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
309 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
312 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
316 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
318 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
321 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
322 umode_t mode, unsigned int dev)
324 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
327 static int apparmor_path_truncate(const struct path *path)
329 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
332 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
333 const char *old_name)
335 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
339 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
340 struct dentry *new_dentry)
342 struct aa_label *label;
345 if (!path_mediated_fs(old_dentry))
348 label = begin_current_label_crit_section();
349 if (!unconfined(label))
350 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
351 end_current_label_crit_section(label);
356 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
357 const struct path *new_dir, struct dentry *new_dentry,
358 const unsigned int flags)
360 struct aa_label *label;
363 if (!path_mediated_fs(old_dentry))
365 if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
368 label = begin_current_label_crit_section();
369 if (!unconfined(label)) {
370 struct user_namespace *mnt_userns = mnt_user_ns(old_dir->mnt);
371 struct path old_path = { .mnt = old_dir->mnt,
372 .dentry = old_dentry };
373 struct path new_path = { .mnt = new_dir->mnt,
374 .dentry = new_dentry };
375 struct path_cond cond = {
376 i_uid_into_mnt(mnt_userns, d_backing_inode(old_dentry)),
377 d_backing_inode(old_dentry)->i_mode
380 if (flags & RENAME_EXCHANGE) {
381 struct path_cond cond_exchange = {
382 i_uid_into_mnt(mnt_userns, d_backing_inode(new_dentry)),
383 d_backing_inode(new_dentry)->i_mode
386 error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0,
387 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
388 AA_MAY_SETATTR | AA_MAY_DELETE,
391 error = aa_path_perm(OP_RENAME_DEST, label, &old_path,
392 0, MAY_WRITE | AA_MAY_SETATTR |
393 AA_MAY_CREATE, &cond_exchange);
397 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
398 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
399 AA_MAY_SETATTR | AA_MAY_DELETE,
402 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
403 0, MAY_WRITE | AA_MAY_SETATTR |
404 AA_MAY_CREATE, &cond);
407 end_current_label_crit_section(label);
412 static int apparmor_path_chmod(const struct path *path, umode_t mode)
414 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
417 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
419 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
422 static int apparmor_inode_getattr(const struct path *path)
424 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
427 static int apparmor_file_open(struct file *file)
429 struct aa_file_ctx *fctx = file_ctx(file);
430 struct aa_label *label;
433 if (!path_mediated_fs(file->f_path.dentry))
436 /* If in exec, permission is handled by bprm hooks.
437 * Cache permissions granted by the previous exec check, with
438 * implicit read and executable mmap which are required to
439 * actually execute the image.
441 if (current->in_execve) {
442 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
446 label = aa_get_newest_cred_label(file->f_cred);
447 if (!unconfined(label)) {
448 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
449 struct inode *inode = file_inode(file);
450 struct path_cond cond = {
451 i_uid_into_mnt(mnt_userns, inode),
455 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
456 aa_map_file_to_perms(file), &cond);
457 /* todo cache full allowed permissions set and state */
458 fctx->allow = aa_map_file_to_perms(file);
465 static int apparmor_file_alloc_security(struct file *file)
467 struct aa_file_ctx *ctx = file_ctx(file);
468 struct aa_label *label = begin_current_label_crit_section();
470 spin_lock_init(&ctx->lock);
471 rcu_assign_pointer(ctx->label, aa_get_label(label));
472 end_current_label_crit_section(label);
476 static void apparmor_file_free_security(struct file *file)
478 struct aa_file_ctx *ctx = file_ctx(file);
481 aa_put_label(rcu_access_pointer(ctx->label));
484 static int common_file_perm(const char *op, struct file *file, u32 mask,
487 struct aa_label *label;
490 /* don't reaudit files closed during inheritance */
491 if (file->f_path.dentry == aa_null.dentry)
494 label = __begin_current_label_crit_section();
495 error = aa_file_perm(op, label, file, mask, in_atomic);
496 __end_current_label_crit_section(label);
501 static int apparmor_file_receive(struct file *file)
503 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
507 static int apparmor_file_permission(struct file *file, int mask)
509 return common_file_perm(OP_FPERM, file, mask, false);
512 static int apparmor_file_lock(struct file *file, unsigned int cmd)
514 u32 mask = AA_MAY_LOCK;
519 return common_file_perm(OP_FLOCK, file, mask, false);
522 static int common_mmap(const char *op, struct file *file, unsigned long prot,
523 unsigned long flags, bool in_atomic)
527 if (!file || !file_ctx(file))
530 if (prot & PROT_READ)
533 * Private mappings don't require write perms since they don't
534 * write back to the files
536 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
538 if (prot & PROT_EXEC)
539 mask |= AA_EXEC_MMAP;
541 return common_file_perm(op, file, mask, in_atomic);
544 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
545 unsigned long prot, unsigned long flags)
547 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
550 static int apparmor_file_mprotect(struct vm_area_struct *vma,
551 unsigned long reqprot, unsigned long prot)
553 return common_mmap(OP_FMPROT, vma->vm_file, prot,
554 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
558 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
559 const char *type, unsigned long flags, void *data)
561 struct aa_label *label;
565 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
566 flags &= ~MS_MGC_MSK;
568 flags &= ~AA_MS_IGNORE_MASK;
570 label = __begin_current_label_crit_section();
571 if (!unconfined(label)) {
572 if (flags & MS_REMOUNT)
573 error = aa_remount(label, path, flags, data);
574 else if (flags & MS_BIND)
575 error = aa_bind_mount(label, path, dev_name, flags);
576 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
578 error = aa_mount_change_type(label, path, flags);
579 else if (flags & MS_MOVE)
580 error = aa_move_mount(label, path, dev_name);
582 error = aa_new_mount(label, dev_name, path, type,
585 __end_current_label_crit_section(label);
590 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
592 struct aa_label *label;
595 label = __begin_current_label_crit_section();
596 if (!unconfined(label))
597 error = aa_umount(label, mnt, flags);
598 __end_current_label_crit_section(label);
603 static int apparmor_sb_pivotroot(const struct path *old_path,
604 const struct path *new_path)
606 struct aa_label *label;
609 label = aa_get_current_label();
610 if (!unconfined(label))
611 error = aa_pivotroot(label, old_path, new_path);
617 static int apparmor_getprocattr(struct task_struct *task, const char *name,
622 const struct cred *cred = get_task_cred(task);
623 struct aa_task_ctx *ctx = task_ctx(current);
624 struct aa_label *label = NULL;
626 if (strcmp(name, "current") == 0)
627 label = aa_get_newest_label(cred_label(cred));
628 else if (strcmp(name, "prev") == 0 && ctx->previous)
629 label = aa_get_newest_label(ctx->previous);
630 else if (strcmp(name, "exec") == 0 && ctx->onexec)
631 label = aa_get_newest_label(ctx->onexec);
636 error = aa_getprocattr(label, value);
644 static int apparmor_setprocattr(const char *name, void *value,
647 char *command, *largs = NULL, *args = value;
650 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
655 /* AppArmor requires that the buffer must be null terminated atm */
656 if (args[size - 1] != '\0') {
658 largs = args = kmalloc(size + 1, GFP_KERNEL);
661 memcpy(args, value, size);
667 command = strsep(&args, " ");
670 args = skip_spaces(args);
674 arg_size = size - (args - (largs ? largs : (char *) value));
675 if (strcmp(name, "current") == 0) {
676 if (strcmp(command, "changehat") == 0) {
677 error = aa_setprocattr_changehat(args, arg_size,
679 } else if (strcmp(command, "permhat") == 0) {
680 error = aa_setprocattr_changehat(args, arg_size,
682 } else if (strcmp(command, "changeprofile") == 0) {
683 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
684 } else if (strcmp(command, "permprofile") == 0) {
685 error = aa_change_profile(args, AA_CHANGE_TEST);
686 } else if (strcmp(command, "stack") == 0) {
687 error = aa_change_profile(args, AA_CHANGE_STACK);
690 } else if (strcmp(name, "exec") == 0) {
691 if (strcmp(command, "exec") == 0)
692 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
693 else if (strcmp(command, "stack") == 0)
694 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
699 /* only support the "current" and "exec" process attributes */
709 aad(&sa)->label = begin_current_label_crit_section();
710 aad(&sa)->info = name;
711 aad(&sa)->error = error = -EINVAL;
712 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
713 end_current_label_crit_section(aad(&sa)->label);
718 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
719 * @bprm: binprm for the exec (NOT NULL)
721 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
723 struct aa_label *label = aa_current_raw_label();
724 struct aa_label *new_label = cred_label(bprm->cred);
726 /* bail out if unconfined or not changing profile */
727 if ((new_label->proxy == label->proxy) ||
728 (unconfined(new_label)))
731 aa_inherit_files(bprm->cred, current->files);
733 current->pdeath_signal = 0;
735 /* reset soft limits and set hard limits for the new label */
736 __aa_transition_rlimits(label, new_label);
740 * apparmor_bprm_committed_cred - do cleanup after new creds committed
741 * @bprm: binprm for the exec (NOT NULL)
743 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
745 /* clear out temporary/transitional state from the context */
746 aa_clear_task_ctx_trans(task_ctx(current));
751 static void apparmor_current_getsecid_subj(u32 *secid)
753 struct aa_label *label = aa_get_current_label();
754 *secid = label->secid;
758 static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
760 struct aa_label *label = aa_get_task_label(p);
761 *secid = label->secid;
765 static int apparmor_task_setrlimit(struct task_struct *task,
766 unsigned int resource, struct rlimit *new_rlim)
768 struct aa_label *label = __begin_current_label_crit_section();
771 if (!unconfined(label))
772 error = aa_task_setrlimit(label, task, resource, new_rlim);
773 __end_current_label_crit_section(label);
778 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
779 int sig, const struct cred *cred)
781 struct aa_label *cl, *tl;
786 * Dealing with USB IO specific behavior
788 cl = aa_get_newest_cred_label(cred);
789 tl = aa_get_task_label(target);
790 error = aa_may_signal(cl, tl, sig);
796 cl = __begin_current_label_crit_section();
797 tl = aa_get_task_label(target);
798 error = aa_may_signal(cl, tl, sig);
800 __end_current_label_crit_section(cl);
806 * apparmor_sk_alloc_security - allocate and attach the sk_security field
808 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
810 struct aa_sk_ctx *ctx;
812 ctx = kzalloc(sizeof(*ctx), flags);
822 * apparmor_sk_free_security - free the sk_security field
824 static void apparmor_sk_free_security(struct sock *sk)
826 struct aa_sk_ctx *ctx = SK_CTX(sk);
829 aa_put_label(ctx->label);
830 aa_put_label(ctx->peer);
835 * apparmor_sk_clone_security - clone the sk_security field
837 static void apparmor_sk_clone_security(const struct sock *sk,
840 struct aa_sk_ctx *ctx = SK_CTX(sk);
841 struct aa_sk_ctx *new = SK_CTX(newsk);
844 aa_put_label(new->label);
845 new->label = aa_get_label(ctx->label);
848 aa_put_label(new->peer);
849 new->peer = aa_get_label(ctx->peer);
853 * apparmor_socket_create - check perms before creating a new socket
855 static int apparmor_socket_create(int family, int type, int protocol, int kern)
857 struct aa_label *label;
860 AA_BUG(in_interrupt());
862 label = begin_current_label_crit_section();
863 if (!(kern || unconfined(label)))
864 error = af_select(family,
865 create_perm(label, family, type, protocol),
866 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
867 family, type, protocol));
868 end_current_label_crit_section(label);
874 * apparmor_socket_post_create - setup the per-socket security struct
877 * - kernel sockets currently labeled unconfined but we may want to
878 * move to a special kernel label
879 * - socket may not have sk here if created with sock_create_lite or
880 * sock_alloc. These should be accept cases which will be handled in
883 static int apparmor_socket_post_create(struct socket *sock, int family,
884 int type, int protocol, int kern)
886 struct aa_label *label;
889 label = aa_get_label(kernel_t);
891 label = aa_get_current_label();
894 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
896 aa_put_label(ctx->label);
897 ctx->label = aa_get_label(label);
905 * apparmor_socket_bind - check perms before bind addr to socket
907 static int apparmor_socket_bind(struct socket *sock,
908 struct sockaddr *address, int addrlen)
913 AA_BUG(in_interrupt());
915 return af_select(sock->sk->sk_family,
916 bind_perm(sock, address, addrlen),
917 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
921 * apparmor_socket_connect - check perms before connecting @sock to @address
923 static int apparmor_socket_connect(struct socket *sock,
924 struct sockaddr *address, int addrlen)
929 AA_BUG(in_interrupt());
931 return af_select(sock->sk->sk_family,
932 connect_perm(sock, address, addrlen),
933 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
937 * apparmor_socket_listen - check perms before allowing listen
939 static int apparmor_socket_listen(struct socket *sock, int backlog)
943 AA_BUG(in_interrupt());
945 return af_select(sock->sk->sk_family,
946 listen_perm(sock, backlog),
947 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
951 * apparmor_socket_accept - check perms before accepting a new connection.
953 * Note: while @newsock is created and has some information, the accept
956 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
961 AA_BUG(in_interrupt());
963 return af_select(sock->sk->sk_family,
964 accept_perm(sock, newsock),
965 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
968 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
969 struct msghdr *msg, int size)
974 AA_BUG(in_interrupt());
976 return af_select(sock->sk->sk_family,
977 msg_perm(op, request, sock, msg, size),
978 aa_sk_perm(op, request, sock->sk));
982 * apparmor_socket_sendmsg - check perms before sending msg to another socket
984 static int apparmor_socket_sendmsg(struct socket *sock,
985 struct msghdr *msg, int size)
987 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
991 * apparmor_socket_recvmsg - check perms before receiving a message
993 static int apparmor_socket_recvmsg(struct socket *sock,
994 struct msghdr *msg, int size, int flags)
996 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
999 /* revaliation, get/set attr, shutdown */
1000 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
1004 AA_BUG(in_interrupt());
1006 return af_select(sock->sk->sk_family,
1007 sock_perm(op, request, sock),
1008 aa_sk_perm(op, request, sock->sk));
1012 * apparmor_socket_getsockname - check perms before getting the local address
1014 static int apparmor_socket_getsockname(struct socket *sock)
1016 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
1020 * apparmor_socket_getpeername - check perms before getting remote address
1022 static int apparmor_socket_getpeername(struct socket *sock)
1024 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
1027 /* revaliation, get/set attr, opt */
1028 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
1029 int level, int optname)
1033 AA_BUG(in_interrupt());
1035 return af_select(sock->sk->sk_family,
1036 opt_perm(op, request, sock, level, optname),
1037 aa_sk_perm(op, request, sock->sk));
1041 * apparmor_socket_getsockopt - check perms before getting socket options
1043 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1046 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1051 * apparmor_socket_setsockopt - check perms before setting socket options
1053 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1056 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1061 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1063 static int apparmor_socket_shutdown(struct socket *sock, int how)
1065 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1068 #ifdef CONFIG_NETWORK_SECMARK
1070 * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
1072 * Note: can not sleep may be called with locks held
1074 * dont want protocol specific in __skb_recv_datagram()
1075 * to deny an incoming connection socket_sock_rcv_skb()
1077 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1079 struct aa_sk_ctx *ctx = SK_CTX(sk);
1084 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1090 static struct aa_label *sk_peer_label(struct sock *sk)
1092 struct aa_sk_ctx *ctx = SK_CTX(sk);
1097 return ERR_PTR(-ENOPROTOOPT);
1101 * apparmor_socket_getpeersec_stream - get security context of peer
1103 * Note: for tcp only valid if using ipsec or cipso on lan
1105 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1106 char __user *optval,
1111 int slen, error = 0;
1112 struct aa_label *label;
1113 struct aa_label *peer;
1115 label = begin_current_label_crit_section();
1116 peer = sk_peer_label(sock->sk);
1118 error = PTR_ERR(peer);
1121 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1122 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1123 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1124 /* don't include terminating \0 in slen, it breaks some apps */
1130 } else if (copy_to_user(optval, name, slen)) {
1134 if (put_user(slen, optlen))
1142 end_current_label_crit_section(label);
1148 * apparmor_socket_getpeersec_dgram - get security label of packet
1149 * @sock: the peer socket
1151 * @secid: pointer to where to put the secid of the packet
1153 * Sets the netlabel socket state on sk from parent
1155 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1156 struct sk_buff *skb, u32 *secid)
1159 /* TODO: requires secid support */
1160 return -ENOPROTOOPT;
1164 * apparmor_sock_graft - Initialize newly created socket
1166 * @parent: parent socket
1168 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1169 * just set sk security information off of current creating process label
1170 * Labeling of sk for accept case - probably should be sock based
1171 * instead of task, because of the case where an implicitly labeled
1172 * socket is shared by different tasks.
1174 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1176 struct aa_sk_ctx *ctx = SK_CTX(sk);
1179 ctx->label = aa_get_current_label();
1182 #ifdef CONFIG_NETWORK_SECMARK
1183 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1184 struct request_sock *req)
1186 struct aa_sk_ctx *ctx = SK_CTX(sk);
1191 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1197 * The cred blob is a pointer to, not an instance of, an aa_label.
1199 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1200 .lbs_cred = sizeof(struct aa_label *),
1201 .lbs_file = sizeof(struct aa_file_ctx),
1202 .lbs_task = sizeof(struct aa_task_ctx),
1205 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1206 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1207 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1208 LSM_HOOK_INIT(capget, apparmor_capget),
1209 LSM_HOOK_INIT(capable, apparmor_capable),
1211 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1212 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1213 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1215 LSM_HOOK_INIT(path_link, apparmor_path_link),
1216 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1217 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1218 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1219 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1220 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1221 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1222 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1223 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1224 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1225 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1227 LSM_HOOK_INIT(file_open, apparmor_file_open),
1228 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1229 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1230 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1231 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1232 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1233 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1234 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1236 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1237 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1239 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1240 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1241 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1243 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1244 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1245 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1246 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1247 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1248 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1249 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1250 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1251 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1252 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1253 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1254 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1255 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1256 #ifdef CONFIG_NETWORK_SECMARK
1257 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1259 LSM_HOOK_INIT(socket_getpeersec_stream,
1260 apparmor_socket_getpeersec_stream),
1261 LSM_HOOK_INIT(socket_getpeersec_dgram,
1262 apparmor_socket_getpeersec_dgram),
1263 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1264 #ifdef CONFIG_NETWORK_SECMARK
1265 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1268 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1269 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1270 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1271 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1273 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1274 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1275 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1277 LSM_HOOK_INIT(task_free, apparmor_task_free),
1278 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1279 LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
1280 LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
1281 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1282 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1285 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1286 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1287 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1288 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1291 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1292 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1293 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1297 * AppArmor sysfs module parameters
1300 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1301 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1302 #define param_check_aabool param_check_bool
1303 static const struct kernel_param_ops param_ops_aabool = {
1304 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1305 .set = param_set_aabool,
1306 .get = param_get_aabool
1309 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1310 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1311 #define param_check_aauint param_check_uint
1312 static const struct kernel_param_ops param_ops_aauint = {
1313 .set = param_set_aauint,
1314 .get = param_get_aauint
1317 static int param_set_aacompressionlevel(const char *val,
1318 const struct kernel_param *kp);
1319 static int param_get_aacompressionlevel(char *buffer,
1320 const struct kernel_param *kp);
1321 #define param_check_aacompressionlevel param_check_int
1322 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1323 .set = param_set_aacompressionlevel,
1324 .get = param_get_aacompressionlevel
1327 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1328 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1329 #define param_check_aalockpolicy param_check_bool
1330 static const struct kernel_param_ops param_ops_aalockpolicy = {
1331 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1332 .set = param_set_aalockpolicy,
1333 .get = param_get_aalockpolicy
1336 static int param_set_audit(const char *val, const struct kernel_param *kp);
1337 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1339 static int param_set_mode(const char *val, const struct kernel_param *kp);
1340 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1342 /* Flag values, also controllable via /sys/module/apparmor/parameters
1343 * We define special types as we want to do additional mediation.
1346 /* AppArmor global enforcement switch - complain, enforce, kill */
1347 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1348 module_param_call(mode, param_set_mode, param_get_mode,
1349 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1351 /* whether policy verification hashing is enabled */
1352 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1353 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1354 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1357 /* whether policy exactly as loaded is retained for debug and checkpointing */
1358 bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
1359 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1360 module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
1363 /* policy loaddata compression level */
1364 int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
1365 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1366 aacompressionlevel, 0400);
1369 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1370 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1373 enum audit_mode aa_g_audit;
1374 module_param_call(audit, param_set_audit, param_get_audit,
1375 &aa_g_audit, S_IRUSR | S_IWUSR);
1377 /* Determines if audit header is included in audited messages. This
1378 * provides more context if the audit daemon is not running
1380 bool aa_g_audit_header = true;
1381 module_param_named(audit_header, aa_g_audit_header, aabool,
1384 /* lock out loading/removal of policy
1385 * TODO: add in at boot loading of policy, which is the only way to
1386 * load policy, if lock_policy is set
1388 bool aa_g_lock_policy;
1389 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1392 /* Syscall logging mode */
1393 bool aa_g_logsyscall;
1394 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1396 /* Maximum pathname length before accesses will start getting rejected */
1397 unsigned int aa_g_path_max = 2 * PATH_MAX;
1398 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1400 /* Determines how paranoid loading of policy is and how much verification
1401 * on the loaded policy is done.
1402 * DEPRECATED: read only as strict checking of load is always done now
1403 * that none root users (user namespaces) can load policy.
1405 bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
1406 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1408 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1409 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1410 #define param_check_aaintbool param_check_int
1411 static const struct kernel_param_ops param_ops_aaintbool = {
1412 .set = param_set_aaintbool,
1413 .get = param_get_aaintbool
1415 /* Boot time disable flag */
1416 static int apparmor_enabled __lsm_ro_after_init = 1;
1417 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1419 static int __init apparmor_enabled_setup(char *str)
1421 unsigned long enabled;
1422 int error = kstrtoul(str, 0, &enabled);
1424 apparmor_enabled = enabled ? 1 : 0;
1428 __setup("apparmor=", apparmor_enabled_setup);
1430 /* set global flag turning off the ability to load policy */
1431 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1433 if (!apparmor_enabled)
1435 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1437 return param_set_bool(val, kp);
1440 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1442 if (!apparmor_enabled)
1444 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1446 return param_get_bool(buffer, kp);
1449 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1451 if (!apparmor_enabled)
1453 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1455 return param_set_bool(val, kp);
1458 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1460 if (!apparmor_enabled)
1462 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1464 return param_get_bool(buffer, kp);
1467 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1471 if (!apparmor_enabled)
1473 /* file is ro but enforce 2nd line check */
1474 if (apparmor_initialized)
1477 error = param_set_uint(val, kp);
1478 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1479 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1484 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1486 if (!apparmor_enabled)
1488 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1490 return param_get_uint(buffer, kp);
1493 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1494 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1496 struct kernel_param kp_local;
1500 if (apparmor_initialized)
1503 /* Create local copy, with arg pointing to bool type. */
1504 value = !!*((int *)kp->arg);
1505 memcpy(&kp_local, kp, sizeof(kp_local));
1506 kp_local.arg = &value;
1508 error = param_set_bool(val, &kp_local);
1510 *((int *)kp->arg) = *((bool *)kp_local.arg);
1515 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1516 * 1/0, this converts the "int that is actually bool" back to bool for
1517 * display in the /sys filesystem, while keeping it "int" for the LSM
1520 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1522 struct kernel_param kp_local;
1525 /* Create local copy, with arg pointing to bool type. */
1526 value = !!*((int *)kp->arg);
1527 memcpy(&kp_local, kp, sizeof(kp_local));
1528 kp_local.arg = &value;
1530 return param_get_bool(buffer, &kp_local);
1533 static int param_set_aacompressionlevel(const char *val,
1534 const struct kernel_param *kp)
1538 if (!apparmor_enabled)
1540 if (apparmor_initialized)
1543 error = param_set_int(val, kp);
1545 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1547 Z_BEST_COMPRESSION);
1548 pr_info("AppArmor: policy rawdata compression level set to %u\n",
1549 aa_g_rawdata_compression_level);
1554 static int param_get_aacompressionlevel(char *buffer,
1555 const struct kernel_param *kp)
1557 if (!apparmor_enabled)
1559 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1561 return param_get_int(buffer, kp);
1564 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1566 if (!apparmor_enabled)
1568 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1570 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1573 static int param_set_audit(const char *val, const struct kernel_param *kp)
1577 if (!apparmor_enabled)
1581 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1584 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1592 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1594 if (!apparmor_enabled)
1596 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1599 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1602 static int param_set_mode(const char *val, const struct kernel_param *kp)
1606 if (!apparmor_enabled)
1610 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1613 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1618 aa_g_profile_mode = i;
1622 char *aa_get_buffer(bool in_atomic)
1624 union aa_buffer *aa_buf;
1625 bool try_again = true;
1626 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1629 spin_lock(&aa_buffers_lock);
1630 if (buffer_count > reserve_count ||
1631 (in_atomic && !list_empty(&aa_global_buffers))) {
1632 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1634 list_del(&aa_buf->list);
1636 spin_unlock(&aa_buffers_lock);
1637 return &aa_buf->buffer[0];
1641 * out of reserve buffers and in atomic context so increase
1642 * how many buffers to keep in reserve
1647 spin_unlock(&aa_buffers_lock);
1651 aa_buf = kmalloc(aa_g_path_max, flags);
1657 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1660 return &aa_buf->buffer[0];
1663 void aa_put_buffer(char *buf)
1665 union aa_buffer *aa_buf;
1669 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1671 spin_lock(&aa_buffers_lock);
1672 list_add(&aa_buf->list, &aa_global_buffers);
1674 spin_unlock(&aa_buffers_lock);
1678 * AppArmor init functions
1682 * set_init_ctx - set a task context and profile on the first task.
1684 * TODO: allow setting an alternate profile than unconfined
1686 static int __init set_init_ctx(void)
1688 struct cred *cred = (__force struct cred *)current->real_cred;
1690 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1695 static void destroy_buffers(void)
1697 union aa_buffer *aa_buf;
1699 spin_lock(&aa_buffers_lock);
1700 while (!list_empty(&aa_global_buffers)) {
1701 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1703 list_del(&aa_buf->list);
1704 spin_unlock(&aa_buffers_lock);
1706 spin_lock(&aa_buffers_lock);
1708 spin_unlock(&aa_buffers_lock);
1711 static int __init alloc_buffers(void)
1713 union aa_buffer *aa_buf;
1717 * A function may require two buffers at once. Usually the buffers are
1718 * used for a short period of time and are shared. On UP kernel buffers
1719 * two should be enough, with more CPUs it is possible that more
1720 * buffers will be used simultaneously. The preallocated pool may grow.
1721 * This preallocation has also the side-effect that AppArmor will be
1722 * disabled early at boot if aa_g_path_max is extremly high.
1724 if (num_online_cpus() > 1)
1725 num = 4 + RESERVE_COUNT;
1727 num = 2 + RESERVE_COUNT;
1729 for (i = 0; i < num; i++) {
1731 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1732 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1737 aa_put_buffer(&aa_buf->buffer[0]);
1742 #ifdef CONFIG_SYSCTL
1743 static int apparmor_dointvec(struct ctl_table *table, int write,
1744 void *buffer, size_t *lenp, loff_t *ppos)
1746 if (!aa_current_policy_admin_capable(NULL))
1748 if (!apparmor_enabled)
1751 return proc_dointvec(table, write, buffer, lenp, ppos);
1754 static struct ctl_path apparmor_sysctl_path[] = {
1755 { .procname = "kernel", },
1759 static struct ctl_table apparmor_sysctl_table[] = {
1761 .procname = "unprivileged_userns_apparmor_policy",
1762 .data = &unprivileged_userns_apparmor_policy,
1763 .maxlen = sizeof(int),
1765 .proc_handler = apparmor_dointvec,
1768 .procname = "apparmor_display_secid_mode",
1769 .data = &apparmor_display_secid_mode,
1770 .maxlen = sizeof(int),
1772 .proc_handler = apparmor_dointvec,
1778 static int __init apparmor_init_sysctl(void)
1780 return register_sysctl_paths(apparmor_sysctl_path,
1781 apparmor_sysctl_table) ? 0 : -ENOMEM;
1784 static inline int apparmor_init_sysctl(void)
1788 #endif /* CONFIG_SYSCTL */
1790 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1791 static unsigned int apparmor_ip_postroute(void *priv,
1792 struct sk_buff *skb,
1793 const struct nf_hook_state *state)
1795 struct aa_sk_ctx *ctx;
1801 sk = skb_to_full_sk(skb);
1806 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1810 return NF_DROP_ERR(-ECONNREFUSED);
1814 static const struct nf_hook_ops apparmor_nf_ops[] = {
1816 .hook = apparmor_ip_postroute,
1818 .hooknum = NF_INET_POST_ROUTING,
1819 .priority = NF_IP_PRI_SELINUX_FIRST,
1821 #if IS_ENABLED(CONFIG_IPV6)
1823 .hook = apparmor_ip_postroute,
1825 .hooknum = NF_INET_POST_ROUTING,
1826 .priority = NF_IP6_PRI_SELINUX_FIRST,
1831 static int __net_init apparmor_nf_register(struct net *net)
1833 return nf_register_net_hooks(net, apparmor_nf_ops,
1834 ARRAY_SIZE(apparmor_nf_ops));
1837 static void __net_exit apparmor_nf_unregister(struct net *net)
1839 nf_unregister_net_hooks(net, apparmor_nf_ops,
1840 ARRAY_SIZE(apparmor_nf_ops));
1843 static struct pernet_operations apparmor_net_ops = {
1844 .init = apparmor_nf_register,
1845 .exit = apparmor_nf_unregister,
1848 static int __init apparmor_nf_ip_init(void)
1852 if (!apparmor_enabled)
1855 err = register_pernet_subsys(&apparmor_net_ops);
1857 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1861 __initcall(apparmor_nf_ip_init);
1864 static int __init apparmor_init(void)
1868 error = aa_setup_dfa_engine();
1870 AA_ERROR("Unable to setup dfa engine\n");
1874 error = aa_alloc_root_ns();
1876 AA_ERROR("Unable to allocate default profile namespace\n");
1880 error = apparmor_init_sysctl();
1882 AA_ERROR("Unable to register sysctls\n");
1887 error = alloc_buffers();
1889 AA_ERROR("Unable to allocate work buffers\n");
1893 error = set_init_ctx();
1895 AA_ERROR("Failed to set context on init task\n");
1899 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1902 /* Report that AppArmor successfully initialized */
1903 apparmor_initialized = 1;
1904 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1905 aa_info_message("AppArmor initialized: complain mode enabled");
1906 else if (aa_g_profile_mode == APPARMOR_KILL)
1907 aa_info_message("AppArmor initialized: kill mode enabled");
1909 aa_info_message("AppArmor initialized");
1917 aa_teardown_dfa_engine();
1919 apparmor_enabled = false;
1923 DEFINE_LSM(apparmor) = {
1925 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1926 .enabled = &apparmor_enabled,
1927 .blobs = &apparmor_blob_sizes,
1928 .init = apparmor_init,