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 vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_userns,
229 d_backing_inode(path->dentry));
230 struct path_cond cond = {
231 vfsuid_into_kuid(vfsuid),
232 d_backing_inode(path->dentry)->i_mode
235 if (!path_mediated_fs(path->dentry))
238 return common_perm(op, path, mask, &cond);
242 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
243 * @op: operation being checked
244 * @dir: directory of the dentry (NOT NULL)
245 * @dentry: dentry to check (NOT NULL)
246 * @mask: requested permissions mask
247 * @cond: conditional info for the permission request (NOT NULL)
249 * Returns: %0 else error code if error or permission denied
251 static int common_perm_dir_dentry(const char *op, const struct path *dir,
252 struct dentry *dentry, u32 mask,
253 struct path_cond *cond)
255 struct path path = { .mnt = dir->mnt, .dentry = dentry };
257 return common_perm(op, &path, mask, cond);
261 * common_perm_rm - common permission wrapper for operations doing rm
262 * @op: operation being checked
263 * @dir: directory that the dentry is in (NOT NULL)
264 * @dentry: dentry being rm'd (NOT NULL)
265 * @mask: requested permission mask
267 * Returns: %0 else error code if error or permission denied
269 static int common_perm_rm(const char *op, const struct path *dir,
270 struct dentry *dentry, u32 mask)
272 struct inode *inode = d_backing_inode(dentry);
273 struct user_namespace *mnt_userns = mnt_user_ns(dir->mnt);
274 struct path_cond cond = { };
277 if (!inode || !path_mediated_fs(dentry))
280 vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
281 cond.uid = vfsuid_into_kuid(vfsuid);
282 cond.mode = inode->i_mode;
284 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
288 * common_perm_create - common permission wrapper for operations doing create
289 * @op: operation being checked
290 * @dir: directory that dentry will be created in (NOT NULL)
291 * @dentry: dentry to create (NOT NULL)
292 * @mask: request permission mask
293 * @mode: created file mode
295 * Returns: %0 else error code if error or permission denied
297 static int common_perm_create(const char *op, const struct path *dir,
298 struct dentry *dentry, u32 mask, umode_t mode)
300 struct path_cond cond = { current_fsuid(), mode };
302 if (!path_mediated_fs(dir->dentry))
305 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
308 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
310 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
313 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
316 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
320 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
322 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
325 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
326 umode_t mode, unsigned int dev)
328 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
331 static int apparmor_path_truncate(const struct path *path)
333 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
336 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
337 const char *old_name)
339 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
343 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
344 struct dentry *new_dentry)
346 struct aa_label *label;
349 if (!path_mediated_fs(old_dentry))
352 label = begin_current_label_crit_section();
353 if (!unconfined(label))
354 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
355 end_current_label_crit_section(label);
360 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
361 const struct path *new_dir, struct dentry *new_dentry,
362 const unsigned int flags)
364 struct aa_label *label;
367 if (!path_mediated_fs(old_dentry))
369 if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
372 label = begin_current_label_crit_section();
373 if (!unconfined(label)) {
374 struct user_namespace *mnt_userns = mnt_user_ns(old_dir->mnt);
376 struct path old_path = { .mnt = old_dir->mnt,
377 .dentry = old_dentry };
378 struct path new_path = { .mnt = new_dir->mnt,
379 .dentry = new_dentry };
380 struct path_cond cond = {
381 .mode = d_backing_inode(old_dentry)->i_mode
383 vfsuid = i_uid_into_vfsuid(mnt_userns, d_backing_inode(old_dentry));
384 cond.uid = vfsuid_into_kuid(vfsuid);
386 if (flags & RENAME_EXCHANGE) {
387 struct path_cond cond_exchange = {
388 .mode = d_backing_inode(new_dentry)->i_mode,
390 vfsuid = i_uid_into_vfsuid(mnt_userns, d_backing_inode(old_dentry));
391 cond_exchange.uid = vfsuid_into_kuid(vfsuid);
393 error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0,
394 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
395 AA_MAY_SETATTR | AA_MAY_DELETE,
398 error = aa_path_perm(OP_RENAME_DEST, label, &old_path,
399 0, MAY_WRITE | AA_MAY_SETATTR |
400 AA_MAY_CREATE, &cond_exchange);
404 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
405 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
406 AA_MAY_SETATTR | AA_MAY_DELETE,
409 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
410 0, MAY_WRITE | AA_MAY_SETATTR |
411 AA_MAY_CREATE, &cond);
414 end_current_label_crit_section(label);
419 static int apparmor_path_chmod(const struct path *path, umode_t mode)
421 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
424 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
426 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
429 static int apparmor_inode_getattr(const struct path *path)
431 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
434 static int apparmor_file_open(struct file *file)
436 struct aa_file_ctx *fctx = file_ctx(file);
437 struct aa_label *label;
440 if (!path_mediated_fs(file->f_path.dentry))
443 /* If in exec, permission is handled by bprm hooks.
444 * Cache permissions granted by the previous exec check, with
445 * implicit read and executable mmap which are required to
446 * actually execute the image.
448 if (current->in_execve) {
449 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
453 label = aa_get_newest_cred_label(file->f_cred);
454 if (!unconfined(label)) {
455 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
456 struct inode *inode = file_inode(file);
458 struct path_cond cond = {
459 .mode = inode->i_mode,
461 vfsuid = i_uid_into_vfsuid(mnt_userns, inode);
462 cond.uid = vfsuid_into_kuid(vfsuid);
464 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
465 aa_map_file_to_perms(file), &cond);
466 /* todo cache full allowed permissions set and state */
467 fctx->allow = aa_map_file_to_perms(file);
474 static int apparmor_file_alloc_security(struct file *file)
476 struct aa_file_ctx *ctx = file_ctx(file);
477 struct aa_label *label = begin_current_label_crit_section();
479 spin_lock_init(&ctx->lock);
480 rcu_assign_pointer(ctx->label, aa_get_label(label));
481 end_current_label_crit_section(label);
485 static void apparmor_file_free_security(struct file *file)
487 struct aa_file_ctx *ctx = file_ctx(file);
490 aa_put_label(rcu_access_pointer(ctx->label));
493 static int common_file_perm(const char *op, struct file *file, u32 mask,
496 struct aa_label *label;
499 /* don't reaudit files closed during inheritance */
500 if (file->f_path.dentry == aa_null.dentry)
503 label = __begin_current_label_crit_section();
504 error = aa_file_perm(op, label, file, mask, in_atomic);
505 __end_current_label_crit_section(label);
510 static int apparmor_file_receive(struct file *file)
512 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
516 static int apparmor_file_permission(struct file *file, int mask)
518 return common_file_perm(OP_FPERM, file, mask, false);
521 static int apparmor_file_lock(struct file *file, unsigned int cmd)
523 u32 mask = AA_MAY_LOCK;
528 return common_file_perm(OP_FLOCK, file, mask, false);
531 static int common_mmap(const char *op, struct file *file, unsigned long prot,
532 unsigned long flags, bool in_atomic)
536 if (!file || !file_ctx(file))
539 if (prot & PROT_READ)
542 * Private mappings don't require write perms since they don't
543 * write back to the files
545 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
547 if (prot & PROT_EXEC)
548 mask |= AA_EXEC_MMAP;
550 return common_file_perm(op, file, mask, in_atomic);
553 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
554 unsigned long prot, unsigned long flags)
556 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
559 static int apparmor_file_mprotect(struct vm_area_struct *vma,
560 unsigned long reqprot, unsigned long prot)
562 return common_mmap(OP_FMPROT, vma->vm_file, prot,
563 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
567 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
568 const char *type, unsigned long flags, void *data)
570 struct aa_label *label;
574 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
575 flags &= ~MS_MGC_MSK;
577 flags &= ~AA_MS_IGNORE_MASK;
579 label = __begin_current_label_crit_section();
580 if (!unconfined(label)) {
581 if (flags & MS_REMOUNT)
582 error = aa_remount(label, path, flags, data);
583 else if (flags & MS_BIND)
584 error = aa_bind_mount(label, path, dev_name, flags);
585 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
587 error = aa_mount_change_type(label, path, flags);
588 else if (flags & MS_MOVE)
589 error = aa_move_mount(label, path, dev_name);
591 error = aa_new_mount(label, dev_name, path, type,
594 __end_current_label_crit_section(label);
599 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
601 struct aa_label *label;
604 label = __begin_current_label_crit_section();
605 if (!unconfined(label))
606 error = aa_umount(label, mnt, flags);
607 __end_current_label_crit_section(label);
612 static int apparmor_sb_pivotroot(const struct path *old_path,
613 const struct path *new_path)
615 struct aa_label *label;
618 label = aa_get_current_label();
619 if (!unconfined(label))
620 error = aa_pivotroot(label, old_path, new_path);
626 static int apparmor_getprocattr(struct task_struct *task, const char *name,
631 const struct cred *cred = get_task_cred(task);
632 struct aa_task_ctx *ctx = task_ctx(current);
633 struct aa_label *label = NULL;
635 if (strcmp(name, "current") == 0)
636 label = aa_get_newest_label(cred_label(cred));
637 else if (strcmp(name, "prev") == 0 && ctx->previous)
638 label = aa_get_newest_label(ctx->previous);
639 else if (strcmp(name, "exec") == 0 && ctx->onexec)
640 label = aa_get_newest_label(ctx->onexec);
645 error = aa_getprocattr(label, value);
653 static int apparmor_setprocattr(const char *name, void *value,
656 char *command, *largs = NULL, *args = value;
659 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
664 /* AppArmor requires that the buffer must be null terminated atm */
665 if (args[size - 1] != '\0') {
667 largs = args = kmalloc(size + 1, GFP_KERNEL);
670 memcpy(args, value, size);
676 command = strsep(&args, " ");
679 args = skip_spaces(args);
683 arg_size = size - (args - (largs ? largs : (char *) value));
684 if (strcmp(name, "current") == 0) {
685 if (strcmp(command, "changehat") == 0) {
686 error = aa_setprocattr_changehat(args, arg_size,
688 } else if (strcmp(command, "permhat") == 0) {
689 error = aa_setprocattr_changehat(args, arg_size,
691 } else if (strcmp(command, "changeprofile") == 0) {
692 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
693 } else if (strcmp(command, "permprofile") == 0) {
694 error = aa_change_profile(args, AA_CHANGE_TEST);
695 } else if (strcmp(command, "stack") == 0) {
696 error = aa_change_profile(args, AA_CHANGE_STACK);
699 } else if (strcmp(name, "exec") == 0) {
700 if (strcmp(command, "exec") == 0)
701 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
702 else if (strcmp(command, "stack") == 0)
703 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
708 /* only support the "current" and "exec" process attributes */
718 aad(&sa)->label = begin_current_label_crit_section();
719 aad(&sa)->info = name;
720 aad(&sa)->error = error = -EINVAL;
721 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
722 end_current_label_crit_section(aad(&sa)->label);
727 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
728 * @bprm: binprm for the exec (NOT NULL)
730 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
732 struct aa_label *label = aa_current_raw_label();
733 struct aa_label *new_label = cred_label(bprm->cred);
735 /* bail out if unconfined or not changing profile */
736 if ((new_label->proxy == label->proxy) ||
737 (unconfined(new_label)))
740 aa_inherit_files(bprm->cred, current->files);
742 current->pdeath_signal = 0;
744 /* reset soft limits and set hard limits for the new label */
745 __aa_transition_rlimits(label, new_label);
749 * apparmor_bprm_committed_cred - do cleanup after new creds committed
750 * @bprm: binprm for the exec (NOT NULL)
752 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
754 /* clear out temporary/transitional state from the context */
755 aa_clear_task_ctx_trans(task_ctx(current));
760 static void apparmor_current_getsecid_subj(u32 *secid)
762 struct aa_label *label = aa_get_current_label();
763 *secid = label->secid;
767 static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
769 struct aa_label *label = aa_get_task_label(p);
770 *secid = label->secid;
774 static int apparmor_task_setrlimit(struct task_struct *task,
775 unsigned int resource, struct rlimit *new_rlim)
777 struct aa_label *label = __begin_current_label_crit_section();
780 if (!unconfined(label))
781 error = aa_task_setrlimit(label, task, resource, new_rlim);
782 __end_current_label_crit_section(label);
787 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
788 int sig, const struct cred *cred)
790 struct aa_label *cl, *tl;
795 * Dealing with USB IO specific behavior
797 cl = aa_get_newest_cred_label(cred);
798 tl = aa_get_task_label(target);
799 error = aa_may_signal(cl, tl, sig);
805 cl = __begin_current_label_crit_section();
806 tl = aa_get_task_label(target);
807 error = aa_may_signal(cl, tl, sig);
809 __end_current_label_crit_section(cl);
815 * apparmor_sk_alloc_security - allocate and attach the sk_security field
817 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
819 struct aa_sk_ctx *ctx;
821 ctx = kzalloc(sizeof(*ctx), flags);
831 * apparmor_sk_free_security - free the sk_security field
833 static void apparmor_sk_free_security(struct sock *sk)
835 struct aa_sk_ctx *ctx = SK_CTX(sk);
838 aa_put_label(ctx->label);
839 aa_put_label(ctx->peer);
844 * apparmor_sk_clone_security - clone the sk_security field
846 static void apparmor_sk_clone_security(const struct sock *sk,
849 struct aa_sk_ctx *ctx = SK_CTX(sk);
850 struct aa_sk_ctx *new = SK_CTX(newsk);
853 aa_put_label(new->label);
854 new->label = aa_get_label(ctx->label);
857 aa_put_label(new->peer);
858 new->peer = aa_get_label(ctx->peer);
862 * apparmor_socket_create - check perms before creating a new socket
864 static int apparmor_socket_create(int family, int type, int protocol, int kern)
866 struct aa_label *label;
869 AA_BUG(in_interrupt());
871 label = begin_current_label_crit_section();
872 if (!(kern || unconfined(label)))
873 error = af_select(family,
874 create_perm(label, family, type, protocol),
875 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
876 family, type, protocol));
877 end_current_label_crit_section(label);
883 * apparmor_socket_post_create - setup the per-socket security struct
886 * - kernel sockets currently labeled unconfined but we may want to
887 * move to a special kernel label
888 * - socket may not have sk here if created with sock_create_lite or
889 * sock_alloc. These should be accept cases which will be handled in
892 static int apparmor_socket_post_create(struct socket *sock, int family,
893 int type, int protocol, int kern)
895 struct aa_label *label;
898 label = aa_get_label(kernel_t);
900 label = aa_get_current_label();
903 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
905 aa_put_label(ctx->label);
906 ctx->label = aa_get_label(label);
914 * apparmor_socket_bind - check perms before bind addr to socket
916 static int apparmor_socket_bind(struct socket *sock,
917 struct sockaddr *address, int addrlen)
922 AA_BUG(in_interrupt());
924 return af_select(sock->sk->sk_family,
925 bind_perm(sock, address, addrlen),
926 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
930 * apparmor_socket_connect - check perms before connecting @sock to @address
932 static int apparmor_socket_connect(struct socket *sock,
933 struct sockaddr *address, int addrlen)
938 AA_BUG(in_interrupt());
940 return af_select(sock->sk->sk_family,
941 connect_perm(sock, address, addrlen),
942 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
946 * apparmor_socket_listen - check perms before allowing listen
948 static int apparmor_socket_listen(struct socket *sock, int backlog)
952 AA_BUG(in_interrupt());
954 return af_select(sock->sk->sk_family,
955 listen_perm(sock, backlog),
956 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
960 * apparmor_socket_accept - check perms before accepting a new connection.
962 * Note: while @newsock is created and has some information, the accept
965 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
970 AA_BUG(in_interrupt());
972 return af_select(sock->sk->sk_family,
973 accept_perm(sock, newsock),
974 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
977 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
978 struct msghdr *msg, int size)
983 AA_BUG(in_interrupt());
985 return af_select(sock->sk->sk_family,
986 msg_perm(op, request, sock, msg, size),
987 aa_sk_perm(op, request, sock->sk));
991 * apparmor_socket_sendmsg - check perms before sending msg to another socket
993 static int apparmor_socket_sendmsg(struct socket *sock,
994 struct msghdr *msg, int size)
996 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
1000 * apparmor_socket_recvmsg - check perms before receiving a message
1002 static int apparmor_socket_recvmsg(struct socket *sock,
1003 struct msghdr *msg, int size, int flags)
1005 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
1008 /* revaliation, get/set attr, shutdown */
1009 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
1013 AA_BUG(in_interrupt());
1015 return af_select(sock->sk->sk_family,
1016 sock_perm(op, request, sock),
1017 aa_sk_perm(op, request, sock->sk));
1021 * apparmor_socket_getsockname - check perms before getting the local address
1023 static int apparmor_socket_getsockname(struct socket *sock)
1025 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
1029 * apparmor_socket_getpeername - check perms before getting remote address
1031 static int apparmor_socket_getpeername(struct socket *sock)
1033 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
1036 /* revaliation, get/set attr, opt */
1037 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
1038 int level, int optname)
1042 AA_BUG(in_interrupt());
1044 return af_select(sock->sk->sk_family,
1045 opt_perm(op, request, sock, level, optname),
1046 aa_sk_perm(op, request, sock->sk));
1050 * apparmor_socket_getsockopt - check perms before getting socket options
1052 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1055 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1060 * apparmor_socket_setsockopt - check perms before setting socket options
1062 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1065 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1070 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1072 static int apparmor_socket_shutdown(struct socket *sock, int how)
1074 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1077 #ifdef CONFIG_NETWORK_SECMARK
1079 * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
1081 * Note: can not sleep may be called with locks held
1083 * dont want protocol specific in __skb_recv_datagram()
1084 * to deny an incoming connection socket_sock_rcv_skb()
1086 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1088 struct aa_sk_ctx *ctx = SK_CTX(sk);
1093 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1099 static struct aa_label *sk_peer_label(struct sock *sk)
1101 struct aa_sk_ctx *ctx = SK_CTX(sk);
1106 return ERR_PTR(-ENOPROTOOPT);
1110 * apparmor_socket_getpeersec_stream - get security context of peer
1112 * Note: for tcp only valid if using ipsec or cipso on lan
1114 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1115 char __user *optval,
1120 int slen, error = 0;
1121 struct aa_label *label;
1122 struct aa_label *peer;
1124 label = begin_current_label_crit_section();
1125 peer = sk_peer_label(sock->sk);
1127 error = PTR_ERR(peer);
1130 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1131 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1132 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1133 /* don't include terminating \0 in slen, it breaks some apps */
1139 } else if (copy_to_user(optval, name, slen)) {
1143 if (put_user(slen, optlen))
1151 end_current_label_crit_section(label);
1157 * apparmor_socket_getpeersec_dgram - get security label of packet
1158 * @sock: the peer socket
1160 * @secid: pointer to where to put the secid of the packet
1162 * Sets the netlabel socket state on sk from parent
1164 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1165 struct sk_buff *skb, u32 *secid)
1168 /* TODO: requires secid support */
1169 return -ENOPROTOOPT;
1173 * apparmor_sock_graft - Initialize newly created socket
1175 * @parent: parent socket
1177 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1178 * just set sk security information off of current creating process label
1179 * Labeling of sk for accept case - probably should be sock based
1180 * instead of task, because of the case where an implicitly labeled
1181 * socket is shared by different tasks.
1183 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1185 struct aa_sk_ctx *ctx = SK_CTX(sk);
1188 ctx->label = aa_get_current_label();
1191 #ifdef CONFIG_NETWORK_SECMARK
1192 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1193 struct request_sock *req)
1195 struct aa_sk_ctx *ctx = SK_CTX(sk);
1200 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1206 * The cred blob is a pointer to, not an instance of, an aa_task_ctx.
1208 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1209 .lbs_cred = sizeof(struct aa_task_ctx *),
1210 .lbs_file = sizeof(struct aa_file_ctx),
1211 .lbs_task = sizeof(struct aa_task_ctx),
1214 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1215 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1216 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1217 LSM_HOOK_INIT(capget, apparmor_capget),
1218 LSM_HOOK_INIT(capable, apparmor_capable),
1220 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1221 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1222 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1224 LSM_HOOK_INIT(path_link, apparmor_path_link),
1225 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1226 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1227 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1228 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1229 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1230 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1231 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1232 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1233 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1234 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1236 LSM_HOOK_INIT(file_open, apparmor_file_open),
1237 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1238 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1239 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1240 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1241 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1242 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1243 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1245 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1246 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1248 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1249 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1250 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1252 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1253 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1254 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1255 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1256 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1257 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1258 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1259 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1260 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1261 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1262 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1263 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1264 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1265 #ifdef CONFIG_NETWORK_SECMARK
1266 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1268 LSM_HOOK_INIT(socket_getpeersec_stream,
1269 apparmor_socket_getpeersec_stream),
1270 LSM_HOOK_INIT(socket_getpeersec_dgram,
1271 apparmor_socket_getpeersec_dgram),
1272 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1273 #ifdef CONFIG_NETWORK_SECMARK
1274 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1277 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1278 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1279 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1280 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1282 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1283 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1284 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1286 LSM_HOOK_INIT(task_free, apparmor_task_free),
1287 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1288 LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
1289 LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
1290 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1291 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1294 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1295 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1296 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1297 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1300 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1301 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1302 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1306 * AppArmor sysfs module parameters
1309 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1310 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1311 #define param_check_aabool param_check_bool
1312 static const struct kernel_param_ops param_ops_aabool = {
1313 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1314 .set = param_set_aabool,
1315 .get = param_get_aabool
1318 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1319 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1320 #define param_check_aauint param_check_uint
1321 static const struct kernel_param_ops param_ops_aauint = {
1322 .set = param_set_aauint,
1323 .get = param_get_aauint
1326 static int param_set_aacompressionlevel(const char *val,
1327 const struct kernel_param *kp);
1328 static int param_get_aacompressionlevel(char *buffer,
1329 const struct kernel_param *kp);
1330 #define param_check_aacompressionlevel param_check_int
1331 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1332 .set = param_set_aacompressionlevel,
1333 .get = param_get_aacompressionlevel
1336 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1337 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1338 #define param_check_aalockpolicy param_check_bool
1339 static const struct kernel_param_ops param_ops_aalockpolicy = {
1340 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1341 .set = param_set_aalockpolicy,
1342 .get = param_get_aalockpolicy
1345 static int param_set_audit(const char *val, const struct kernel_param *kp);
1346 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1348 static int param_set_mode(const char *val, const struct kernel_param *kp);
1349 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1351 /* Flag values, also controllable via /sys/module/apparmor/parameters
1352 * We define special types as we want to do additional mediation.
1355 /* AppArmor global enforcement switch - complain, enforce, kill */
1356 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1357 module_param_call(mode, param_set_mode, param_get_mode,
1358 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1360 /* whether policy verification hashing is enabled */
1361 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1362 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1363 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1366 /* whether policy exactly as loaded is retained for debug and checkpointing */
1367 bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
1368 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1369 module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
1372 /* policy loaddata compression level */
1373 int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
1374 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1375 aacompressionlevel, 0400);
1378 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1379 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1382 enum audit_mode aa_g_audit;
1383 module_param_call(audit, param_set_audit, param_get_audit,
1384 &aa_g_audit, S_IRUSR | S_IWUSR);
1386 /* Determines if audit header is included in audited messages. This
1387 * provides more context if the audit daemon is not running
1389 bool aa_g_audit_header = true;
1390 module_param_named(audit_header, aa_g_audit_header, aabool,
1393 /* lock out loading/removal of policy
1394 * TODO: add in at boot loading of policy, which is the only way to
1395 * load policy, if lock_policy is set
1397 bool aa_g_lock_policy;
1398 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1401 /* Syscall logging mode */
1402 bool aa_g_logsyscall;
1403 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1405 /* Maximum pathname length before accesses will start getting rejected */
1406 unsigned int aa_g_path_max = 2 * PATH_MAX;
1407 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1409 /* Determines how paranoid loading of policy is and how much verification
1410 * on the loaded policy is done.
1411 * DEPRECATED: read only as strict checking of load is always done now
1412 * that none root users (user namespaces) can load policy.
1414 bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
1415 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1417 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1418 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1419 #define param_check_aaintbool param_check_int
1420 static const struct kernel_param_ops param_ops_aaintbool = {
1421 .set = param_set_aaintbool,
1422 .get = param_get_aaintbool
1424 /* Boot time disable flag */
1425 static int apparmor_enabled __lsm_ro_after_init = 1;
1426 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1428 static int __init apparmor_enabled_setup(char *str)
1430 unsigned long enabled;
1431 int error = kstrtoul(str, 0, &enabled);
1433 apparmor_enabled = enabled ? 1 : 0;
1437 __setup("apparmor=", apparmor_enabled_setup);
1439 /* set global flag turning off the ability to load policy */
1440 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1442 if (!apparmor_enabled)
1444 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1446 return param_set_bool(val, kp);
1449 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1451 if (!apparmor_enabled)
1453 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1455 return param_get_bool(buffer, kp);
1458 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1460 if (!apparmor_enabled)
1462 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1464 return param_set_bool(val, kp);
1467 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1469 if (!apparmor_enabled)
1471 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1473 return param_get_bool(buffer, kp);
1476 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1480 if (!apparmor_enabled)
1482 /* file is ro but enforce 2nd line check */
1483 if (apparmor_initialized)
1486 error = param_set_uint(val, kp);
1487 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1488 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1493 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1495 if (!apparmor_enabled)
1497 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1499 return param_get_uint(buffer, kp);
1502 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1503 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1505 struct kernel_param kp_local;
1509 if (apparmor_initialized)
1512 /* Create local copy, with arg pointing to bool type. */
1513 value = !!*((int *)kp->arg);
1514 memcpy(&kp_local, kp, sizeof(kp_local));
1515 kp_local.arg = &value;
1517 error = param_set_bool(val, &kp_local);
1519 *((int *)kp->arg) = *((bool *)kp_local.arg);
1524 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1525 * 1/0, this converts the "int that is actually bool" back to bool for
1526 * display in the /sys filesystem, while keeping it "int" for the LSM
1529 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1531 struct kernel_param kp_local;
1534 /* Create local copy, with arg pointing to bool type. */
1535 value = !!*((int *)kp->arg);
1536 memcpy(&kp_local, kp, sizeof(kp_local));
1537 kp_local.arg = &value;
1539 return param_get_bool(buffer, &kp_local);
1542 static int param_set_aacompressionlevel(const char *val,
1543 const struct kernel_param *kp)
1547 if (!apparmor_enabled)
1549 if (apparmor_initialized)
1552 error = param_set_int(val, kp);
1554 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1556 Z_BEST_COMPRESSION);
1557 pr_info("AppArmor: policy rawdata compression level set to %u\n",
1558 aa_g_rawdata_compression_level);
1563 static int param_get_aacompressionlevel(char *buffer,
1564 const struct kernel_param *kp)
1566 if (!apparmor_enabled)
1568 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1570 return param_get_int(buffer, kp);
1573 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1575 if (!apparmor_enabled)
1577 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1579 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1582 static int param_set_audit(const char *val, const struct kernel_param *kp)
1586 if (!apparmor_enabled)
1590 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1593 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1601 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1603 if (!apparmor_enabled)
1605 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1608 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1611 static int param_set_mode(const char *val, const struct kernel_param *kp)
1615 if (!apparmor_enabled)
1619 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1622 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1627 aa_g_profile_mode = i;
1631 char *aa_get_buffer(bool in_atomic)
1633 union aa_buffer *aa_buf;
1634 bool try_again = true;
1635 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1638 spin_lock(&aa_buffers_lock);
1639 if (buffer_count > reserve_count ||
1640 (in_atomic && !list_empty(&aa_global_buffers))) {
1641 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1643 list_del(&aa_buf->list);
1645 spin_unlock(&aa_buffers_lock);
1646 return &aa_buf->buffer[0];
1650 * out of reserve buffers and in atomic context so increase
1651 * how many buffers to keep in reserve
1656 spin_unlock(&aa_buffers_lock);
1660 aa_buf = kmalloc(aa_g_path_max, flags);
1666 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1669 return &aa_buf->buffer[0];
1672 void aa_put_buffer(char *buf)
1674 union aa_buffer *aa_buf;
1678 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1680 spin_lock(&aa_buffers_lock);
1681 list_add(&aa_buf->list, &aa_global_buffers);
1683 spin_unlock(&aa_buffers_lock);
1687 * AppArmor init functions
1691 * set_init_ctx - set a task context and profile on the first task.
1693 * TODO: allow setting an alternate profile than unconfined
1695 static int __init set_init_ctx(void)
1697 struct cred *cred = (__force struct cred *)current->real_cred;
1699 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1704 static void destroy_buffers(void)
1706 union aa_buffer *aa_buf;
1708 spin_lock(&aa_buffers_lock);
1709 while (!list_empty(&aa_global_buffers)) {
1710 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1712 list_del(&aa_buf->list);
1713 spin_unlock(&aa_buffers_lock);
1715 spin_lock(&aa_buffers_lock);
1717 spin_unlock(&aa_buffers_lock);
1720 static int __init alloc_buffers(void)
1722 union aa_buffer *aa_buf;
1726 * A function may require two buffers at once. Usually the buffers are
1727 * used for a short period of time and are shared. On UP kernel buffers
1728 * two should be enough, with more CPUs it is possible that more
1729 * buffers will be used simultaneously. The preallocated pool may grow.
1730 * This preallocation has also the side-effect that AppArmor will be
1731 * disabled early at boot if aa_g_path_max is extremly high.
1733 if (num_online_cpus() > 1)
1734 num = 4 + RESERVE_COUNT;
1736 num = 2 + RESERVE_COUNT;
1738 for (i = 0; i < num; i++) {
1740 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1741 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1746 aa_put_buffer(&aa_buf->buffer[0]);
1751 #ifdef CONFIG_SYSCTL
1752 static int apparmor_dointvec(struct ctl_table *table, int write,
1753 void *buffer, size_t *lenp, loff_t *ppos)
1755 if (!aa_current_policy_admin_capable(NULL))
1757 if (!apparmor_enabled)
1760 return proc_dointvec(table, write, buffer, lenp, ppos);
1763 static struct ctl_path apparmor_sysctl_path[] = {
1764 { .procname = "kernel", },
1768 static struct ctl_table apparmor_sysctl_table[] = {
1770 .procname = "unprivileged_userns_apparmor_policy",
1771 .data = &unprivileged_userns_apparmor_policy,
1772 .maxlen = sizeof(int),
1774 .proc_handler = apparmor_dointvec,
1777 .procname = "apparmor_display_secid_mode",
1778 .data = &apparmor_display_secid_mode,
1779 .maxlen = sizeof(int),
1781 .proc_handler = apparmor_dointvec,
1787 static int __init apparmor_init_sysctl(void)
1789 return register_sysctl_paths(apparmor_sysctl_path,
1790 apparmor_sysctl_table) ? 0 : -ENOMEM;
1793 static inline int apparmor_init_sysctl(void)
1797 #endif /* CONFIG_SYSCTL */
1799 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1800 static unsigned int apparmor_ip_postroute(void *priv,
1801 struct sk_buff *skb,
1802 const struct nf_hook_state *state)
1804 struct aa_sk_ctx *ctx;
1810 sk = skb_to_full_sk(skb);
1815 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1819 return NF_DROP_ERR(-ECONNREFUSED);
1823 static const struct nf_hook_ops apparmor_nf_ops[] = {
1825 .hook = apparmor_ip_postroute,
1827 .hooknum = NF_INET_POST_ROUTING,
1828 .priority = NF_IP_PRI_SELINUX_FIRST,
1830 #if IS_ENABLED(CONFIG_IPV6)
1832 .hook = apparmor_ip_postroute,
1834 .hooknum = NF_INET_POST_ROUTING,
1835 .priority = NF_IP6_PRI_SELINUX_FIRST,
1840 static int __net_init apparmor_nf_register(struct net *net)
1842 return nf_register_net_hooks(net, apparmor_nf_ops,
1843 ARRAY_SIZE(apparmor_nf_ops));
1846 static void __net_exit apparmor_nf_unregister(struct net *net)
1848 nf_unregister_net_hooks(net, apparmor_nf_ops,
1849 ARRAY_SIZE(apparmor_nf_ops));
1852 static struct pernet_operations apparmor_net_ops = {
1853 .init = apparmor_nf_register,
1854 .exit = apparmor_nf_unregister,
1857 static int __init apparmor_nf_ip_init(void)
1861 if (!apparmor_enabled)
1864 err = register_pernet_subsys(&apparmor_net_ops);
1866 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1870 __initcall(apparmor_nf_ip_init);
1873 static int __init apparmor_init(void)
1877 error = aa_setup_dfa_engine();
1879 AA_ERROR("Unable to setup dfa engine\n");
1883 error = aa_alloc_root_ns();
1885 AA_ERROR("Unable to allocate default profile namespace\n");
1889 error = apparmor_init_sysctl();
1891 AA_ERROR("Unable to register sysctls\n");
1896 error = alloc_buffers();
1898 AA_ERROR("Unable to allocate work buffers\n");
1902 error = set_init_ctx();
1904 AA_ERROR("Failed to set context on init task\n");
1908 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1911 /* Report that AppArmor successfully initialized */
1912 apparmor_initialized = 1;
1913 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1914 aa_info_message("AppArmor initialized: complain mode enabled");
1915 else if (aa_g_profile_mode == APPARMOR_KILL)
1916 aa_info_message("AppArmor initialized: kill mode enabled");
1918 aa_info_message("AppArmor initialized");
1926 aa_teardown_dfa_engine();
1928 apparmor_enabled = false;
1932 DEFINE_LSM(apparmor) = {
1934 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1935 .enabled = &apparmor_enabled,
1936 .blobs = &apparmor_blob_sizes,
1937 .init = apparmor_init,