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_file_truncate(struct file *file)
334 return apparmor_path_truncate(&file->f_path);
337 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
338 const char *old_name)
340 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
344 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
345 struct dentry *new_dentry)
347 struct aa_label *label;
350 if (!path_mediated_fs(old_dentry))
353 label = begin_current_label_crit_section();
354 if (!unconfined(label))
355 error = aa_path_link(label, old_dentry, new_dir, new_dentry);
356 end_current_label_crit_section(label);
361 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
362 const struct path *new_dir, struct dentry *new_dentry,
363 const unsigned int flags)
365 struct aa_label *label;
368 if (!path_mediated_fs(old_dentry))
370 if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
373 label = begin_current_label_crit_section();
374 if (!unconfined(label)) {
375 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 i_uid_into_mnt(mnt_userns, d_backing_inode(old_dentry)),
382 d_backing_inode(old_dentry)->i_mode
385 if (flags & RENAME_EXCHANGE) {
386 struct path_cond cond_exchange = {
387 i_uid_into_mnt(mnt_userns, d_backing_inode(new_dentry)),
388 d_backing_inode(new_dentry)->i_mode
391 error = aa_path_perm(OP_RENAME_SRC, label, &new_path, 0,
392 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
393 AA_MAY_SETATTR | AA_MAY_DELETE,
396 error = aa_path_perm(OP_RENAME_DEST, label, &old_path,
397 0, MAY_WRITE | AA_MAY_SETATTR |
398 AA_MAY_CREATE, &cond_exchange);
402 error = aa_path_perm(OP_RENAME_SRC, label, &old_path, 0,
403 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
404 AA_MAY_SETATTR | AA_MAY_DELETE,
407 error = aa_path_perm(OP_RENAME_DEST, label, &new_path,
408 0, MAY_WRITE | AA_MAY_SETATTR |
409 AA_MAY_CREATE, &cond);
412 end_current_label_crit_section(label);
417 static int apparmor_path_chmod(const struct path *path, umode_t mode)
419 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
422 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
424 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
427 static int apparmor_inode_getattr(const struct path *path)
429 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
432 static int apparmor_file_open(struct file *file)
434 struct aa_file_ctx *fctx = file_ctx(file);
435 struct aa_label *label;
438 if (!path_mediated_fs(file->f_path.dentry))
441 /* If in exec, permission is handled by bprm hooks.
442 * Cache permissions granted by the previous exec check, with
443 * implicit read and executable mmap which are required to
444 * actually execute the image.
446 if (current->in_execve) {
447 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
451 label = aa_get_newest_cred_label(file->f_cred);
452 if (!unconfined(label)) {
453 struct user_namespace *mnt_userns = file_mnt_user_ns(file);
454 struct inode *inode = file_inode(file);
455 struct path_cond cond = {
456 i_uid_into_mnt(mnt_userns, inode),
460 error = aa_path_perm(OP_OPEN, label, &file->f_path, 0,
461 aa_map_file_to_perms(file), &cond);
462 /* todo cache full allowed permissions set and state */
463 fctx->allow = aa_map_file_to_perms(file);
470 static int apparmor_file_alloc_security(struct file *file)
472 struct aa_file_ctx *ctx = file_ctx(file);
473 struct aa_label *label = begin_current_label_crit_section();
475 spin_lock_init(&ctx->lock);
476 rcu_assign_pointer(ctx->label, aa_get_label(label));
477 end_current_label_crit_section(label);
481 static void apparmor_file_free_security(struct file *file)
483 struct aa_file_ctx *ctx = file_ctx(file);
486 aa_put_label(rcu_access_pointer(ctx->label));
489 static int common_file_perm(const char *op, struct file *file, u32 mask,
492 struct aa_label *label;
495 /* don't reaudit files closed during inheritance */
496 if (file->f_path.dentry == aa_null.dentry)
499 label = __begin_current_label_crit_section();
500 error = aa_file_perm(op, label, file, mask, in_atomic);
501 __end_current_label_crit_section(label);
506 static int apparmor_file_receive(struct file *file)
508 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
512 static int apparmor_file_permission(struct file *file, int mask)
514 return common_file_perm(OP_FPERM, file, mask, false);
517 static int apparmor_file_lock(struct file *file, unsigned int cmd)
519 u32 mask = AA_MAY_LOCK;
524 return common_file_perm(OP_FLOCK, file, mask, false);
527 static int common_mmap(const char *op, struct file *file, unsigned long prot,
528 unsigned long flags, bool in_atomic)
532 if (!file || !file_ctx(file))
535 if (prot & PROT_READ)
538 * Private mappings don't require write perms since they don't
539 * write back to the files
541 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
543 if (prot & PROT_EXEC)
544 mask |= AA_EXEC_MMAP;
546 return common_file_perm(op, file, mask, in_atomic);
549 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
550 unsigned long prot, unsigned long flags)
552 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
555 static int apparmor_file_mprotect(struct vm_area_struct *vma,
556 unsigned long reqprot, unsigned long prot)
558 return common_mmap(OP_FMPROT, vma->vm_file, prot,
559 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
563 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
564 const char *type, unsigned long flags, void *data)
566 struct aa_label *label;
570 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
571 flags &= ~MS_MGC_MSK;
573 flags &= ~AA_MS_IGNORE_MASK;
575 label = __begin_current_label_crit_section();
576 if (!unconfined(label)) {
577 if (flags & MS_REMOUNT)
578 error = aa_remount(label, path, flags, data);
579 else if (flags & MS_BIND)
580 error = aa_bind_mount(label, path, dev_name, flags);
581 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
583 error = aa_mount_change_type(label, path, flags);
584 else if (flags & MS_MOVE)
585 error = aa_move_mount(label, path, dev_name);
587 error = aa_new_mount(label, dev_name, path, type,
590 __end_current_label_crit_section(label);
595 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
597 struct aa_label *label;
600 label = __begin_current_label_crit_section();
601 if (!unconfined(label))
602 error = aa_umount(label, mnt, flags);
603 __end_current_label_crit_section(label);
608 static int apparmor_sb_pivotroot(const struct path *old_path,
609 const struct path *new_path)
611 struct aa_label *label;
614 label = aa_get_current_label();
615 if (!unconfined(label))
616 error = aa_pivotroot(label, old_path, new_path);
622 static int apparmor_getprocattr(struct task_struct *task, const char *name,
627 const struct cred *cred = get_task_cred(task);
628 struct aa_task_ctx *ctx = task_ctx(current);
629 struct aa_label *label = NULL;
631 if (strcmp(name, "current") == 0)
632 label = aa_get_newest_label(cred_label(cred));
633 else if (strcmp(name, "prev") == 0 && ctx->previous)
634 label = aa_get_newest_label(ctx->previous);
635 else if (strcmp(name, "exec") == 0 && ctx->onexec)
636 label = aa_get_newest_label(ctx->onexec);
641 error = aa_getprocattr(label, value);
649 static int apparmor_setprocattr(const char *name, void *value,
652 char *command, *largs = NULL, *args = value;
655 DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, OP_SETPROCATTR);
660 /* AppArmor requires that the buffer must be null terminated atm */
661 if (args[size - 1] != '\0') {
663 largs = args = kmalloc(size + 1, GFP_KERNEL);
666 memcpy(args, value, size);
672 command = strsep(&args, " ");
675 args = skip_spaces(args);
679 arg_size = size - (args - (largs ? largs : (char *) value));
680 if (strcmp(name, "current") == 0) {
681 if (strcmp(command, "changehat") == 0) {
682 error = aa_setprocattr_changehat(args, arg_size,
684 } else if (strcmp(command, "permhat") == 0) {
685 error = aa_setprocattr_changehat(args, arg_size,
687 } else if (strcmp(command, "changeprofile") == 0) {
688 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
689 } else if (strcmp(command, "permprofile") == 0) {
690 error = aa_change_profile(args, AA_CHANGE_TEST);
691 } else if (strcmp(command, "stack") == 0) {
692 error = aa_change_profile(args, AA_CHANGE_STACK);
695 } else if (strcmp(name, "exec") == 0) {
696 if (strcmp(command, "exec") == 0)
697 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
698 else if (strcmp(command, "stack") == 0)
699 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
704 /* only support the "current" and "exec" process attributes */
714 aad(&sa)->label = begin_current_label_crit_section();
715 aad(&sa)->info = name;
716 aad(&sa)->error = error = -EINVAL;
717 aa_audit_msg(AUDIT_APPARMOR_DENIED, &sa, NULL);
718 end_current_label_crit_section(aad(&sa)->label);
723 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
724 * @bprm: binprm for the exec (NOT NULL)
726 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
728 struct aa_label *label = aa_current_raw_label();
729 struct aa_label *new_label = cred_label(bprm->cred);
731 /* bail out if unconfined or not changing profile */
732 if ((new_label->proxy == label->proxy) ||
733 (unconfined(new_label)))
736 aa_inherit_files(bprm->cred, current->files);
738 current->pdeath_signal = 0;
740 /* reset soft limits and set hard limits for the new label */
741 __aa_transition_rlimits(label, new_label);
745 * apparmor_bprm_committed_cred - do cleanup after new creds committed
746 * @bprm: binprm for the exec (NOT NULL)
748 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
750 /* clear out temporary/transitional state from the context */
751 aa_clear_task_ctx_trans(task_ctx(current));
756 static void apparmor_current_getsecid_subj(u32 *secid)
758 struct aa_label *label = aa_get_current_label();
759 *secid = label->secid;
763 static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
765 struct aa_label *label = aa_get_task_label(p);
766 *secid = label->secid;
770 static int apparmor_task_setrlimit(struct task_struct *task,
771 unsigned int resource, struct rlimit *new_rlim)
773 struct aa_label *label = __begin_current_label_crit_section();
776 if (!unconfined(label))
777 error = aa_task_setrlimit(label, task, resource, new_rlim);
778 __end_current_label_crit_section(label);
783 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
784 int sig, const struct cred *cred)
786 struct aa_label *cl, *tl;
791 * Dealing with USB IO specific behavior
793 cl = aa_get_newest_cred_label(cred);
794 tl = aa_get_task_label(target);
795 error = aa_may_signal(cl, tl, sig);
801 cl = __begin_current_label_crit_section();
802 tl = aa_get_task_label(target);
803 error = aa_may_signal(cl, tl, sig);
805 __end_current_label_crit_section(cl);
811 * apparmor_sk_alloc_security - allocate and attach the sk_security field
813 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
815 struct aa_sk_ctx *ctx;
817 ctx = kzalloc(sizeof(*ctx), flags);
827 * apparmor_sk_free_security - free the sk_security field
829 static void apparmor_sk_free_security(struct sock *sk)
831 struct aa_sk_ctx *ctx = SK_CTX(sk);
834 aa_put_label(ctx->label);
835 aa_put_label(ctx->peer);
840 * apparmor_sk_clone_security - clone the sk_security field
842 static void apparmor_sk_clone_security(const struct sock *sk,
845 struct aa_sk_ctx *ctx = SK_CTX(sk);
846 struct aa_sk_ctx *new = SK_CTX(newsk);
849 aa_put_label(new->label);
850 new->label = aa_get_label(ctx->label);
853 aa_put_label(new->peer);
854 new->peer = aa_get_label(ctx->peer);
858 * apparmor_socket_create - check perms before creating a new socket
860 static int apparmor_socket_create(int family, int type, int protocol, int kern)
862 struct aa_label *label;
865 AA_BUG(in_interrupt());
867 label = begin_current_label_crit_section();
868 if (!(kern || unconfined(label)))
869 error = af_select(family,
870 create_perm(label, family, type, protocol),
871 aa_af_perm(label, OP_CREATE, AA_MAY_CREATE,
872 family, type, protocol));
873 end_current_label_crit_section(label);
879 * apparmor_socket_post_create - setup the per-socket security struct
882 * - kernel sockets currently labeled unconfined but we may want to
883 * move to a special kernel label
884 * - socket may not have sk here if created with sock_create_lite or
885 * sock_alloc. These should be accept cases which will be handled in
888 static int apparmor_socket_post_create(struct socket *sock, int family,
889 int type, int protocol, int kern)
891 struct aa_label *label;
894 label = aa_get_label(kernel_t);
896 label = aa_get_current_label();
899 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
901 aa_put_label(ctx->label);
902 ctx->label = aa_get_label(label);
910 * apparmor_socket_bind - check perms before bind addr to socket
912 static int apparmor_socket_bind(struct socket *sock,
913 struct sockaddr *address, int addrlen)
918 AA_BUG(in_interrupt());
920 return af_select(sock->sk->sk_family,
921 bind_perm(sock, address, addrlen),
922 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
926 * apparmor_socket_connect - check perms before connecting @sock to @address
928 static int apparmor_socket_connect(struct socket *sock,
929 struct sockaddr *address, int addrlen)
934 AA_BUG(in_interrupt());
936 return af_select(sock->sk->sk_family,
937 connect_perm(sock, address, addrlen),
938 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
942 * apparmor_socket_listen - check perms before allowing listen
944 static int apparmor_socket_listen(struct socket *sock, int backlog)
948 AA_BUG(in_interrupt());
950 return af_select(sock->sk->sk_family,
951 listen_perm(sock, backlog),
952 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
956 * apparmor_socket_accept - check perms before accepting a new connection.
958 * Note: while @newsock is created and has some information, the accept
961 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
966 AA_BUG(in_interrupt());
968 return af_select(sock->sk->sk_family,
969 accept_perm(sock, newsock),
970 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
973 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
974 struct msghdr *msg, int size)
979 AA_BUG(in_interrupt());
981 return af_select(sock->sk->sk_family,
982 msg_perm(op, request, sock, msg, size),
983 aa_sk_perm(op, request, sock->sk));
987 * apparmor_socket_sendmsg - check perms before sending msg to another socket
989 static int apparmor_socket_sendmsg(struct socket *sock,
990 struct msghdr *msg, int size)
992 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
996 * apparmor_socket_recvmsg - check perms before receiving a message
998 static int apparmor_socket_recvmsg(struct socket *sock,
999 struct msghdr *msg, int size, int flags)
1001 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
1004 /* revaliation, get/set attr, shutdown */
1005 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
1009 AA_BUG(in_interrupt());
1011 return af_select(sock->sk->sk_family,
1012 sock_perm(op, request, sock),
1013 aa_sk_perm(op, request, sock->sk));
1017 * apparmor_socket_getsockname - check perms before getting the local address
1019 static int apparmor_socket_getsockname(struct socket *sock)
1021 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
1025 * apparmor_socket_getpeername - check perms before getting remote address
1027 static int apparmor_socket_getpeername(struct socket *sock)
1029 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
1032 /* revaliation, get/set attr, opt */
1033 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
1034 int level, int optname)
1038 AA_BUG(in_interrupt());
1040 return af_select(sock->sk->sk_family,
1041 opt_perm(op, request, sock, level, optname),
1042 aa_sk_perm(op, request, sock->sk));
1046 * apparmor_socket_getsockopt - check perms before getting socket options
1048 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1051 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1056 * apparmor_socket_setsockopt - check perms before setting socket options
1058 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1061 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1066 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1068 static int apparmor_socket_shutdown(struct socket *sock, int how)
1070 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1073 #ifdef CONFIG_NETWORK_SECMARK
1075 * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
1077 * Note: can not sleep may be called with locks held
1079 * dont want protocol specific in __skb_recv_datagram()
1080 * to deny an incoming connection socket_sock_rcv_skb()
1082 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1084 struct aa_sk_ctx *ctx = SK_CTX(sk);
1089 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1095 static struct aa_label *sk_peer_label(struct sock *sk)
1097 struct aa_sk_ctx *ctx = SK_CTX(sk);
1102 return ERR_PTR(-ENOPROTOOPT);
1106 * apparmor_socket_getpeersec_stream - get security context of peer
1108 * Note: for tcp only valid if using ipsec or cipso on lan
1110 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1111 char __user *optval,
1116 int slen, error = 0;
1117 struct aa_label *label;
1118 struct aa_label *peer;
1120 label = begin_current_label_crit_section();
1121 peer = sk_peer_label(sock->sk);
1123 error = PTR_ERR(peer);
1126 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1127 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1128 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1129 /* don't include terminating \0 in slen, it breaks some apps */
1135 } else if (copy_to_user(optval, name, slen)) {
1139 if (put_user(slen, optlen))
1147 end_current_label_crit_section(label);
1153 * apparmor_socket_getpeersec_dgram - get security label of packet
1154 * @sock: the peer socket
1156 * @secid: pointer to where to put the secid of the packet
1158 * Sets the netlabel socket state on sk from parent
1160 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1161 struct sk_buff *skb, u32 *secid)
1164 /* TODO: requires secid support */
1165 return -ENOPROTOOPT;
1169 * apparmor_sock_graft - Initialize newly created socket
1171 * @parent: parent socket
1173 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1174 * just set sk security information off of current creating process label
1175 * Labeling of sk for accept case - probably should be sock based
1176 * instead of task, because of the case where an implicitly labeled
1177 * socket is shared by different tasks.
1179 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1181 struct aa_sk_ctx *ctx = SK_CTX(sk);
1184 ctx->label = aa_get_current_label();
1187 #ifdef CONFIG_NETWORK_SECMARK
1188 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1189 struct request_sock *req)
1191 struct aa_sk_ctx *ctx = SK_CTX(sk);
1196 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1202 * The cred blob is a pointer to, not an instance of, an aa_task_ctx.
1204 struct lsm_blob_sizes apparmor_blob_sizes __lsm_ro_after_init = {
1205 .lbs_cred = sizeof(struct aa_task_ctx *),
1206 .lbs_file = sizeof(struct aa_file_ctx),
1207 .lbs_task = sizeof(struct aa_task_ctx),
1210 static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
1211 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1212 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1213 LSM_HOOK_INIT(capget, apparmor_capget),
1214 LSM_HOOK_INIT(capable, apparmor_capable),
1216 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1217 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1218 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1220 LSM_HOOK_INIT(path_link, apparmor_path_link),
1221 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1222 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1223 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1224 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1225 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1226 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1227 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1228 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1229 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1230 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1232 LSM_HOOK_INIT(file_open, apparmor_file_open),
1233 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1234 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1235 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1236 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1237 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1238 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1239 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1240 LSM_HOOK_INIT(file_truncate, apparmor_file_truncate),
1242 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1243 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1245 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1246 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1247 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1249 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1250 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1251 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1252 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1253 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1254 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1255 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1256 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1257 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1258 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1259 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1260 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1261 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1262 #ifdef CONFIG_NETWORK_SECMARK
1263 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1265 LSM_HOOK_INIT(socket_getpeersec_stream,
1266 apparmor_socket_getpeersec_stream),
1267 LSM_HOOK_INIT(socket_getpeersec_dgram,
1268 apparmor_socket_getpeersec_dgram),
1269 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1270 #ifdef CONFIG_NETWORK_SECMARK
1271 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1274 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1275 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1276 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1277 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1279 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1280 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1281 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1283 LSM_HOOK_INIT(task_free, apparmor_task_free),
1284 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1285 LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
1286 LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
1287 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1288 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1291 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1292 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1293 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1294 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1297 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1298 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1299 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1303 * AppArmor sysfs module parameters
1306 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1307 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1308 #define param_check_aabool param_check_bool
1309 static const struct kernel_param_ops param_ops_aabool = {
1310 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1311 .set = param_set_aabool,
1312 .get = param_get_aabool
1315 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1316 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1317 #define param_check_aauint param_check_uint
1318 static const struct kernel_param_ops param_ops_aauint = {
1319 .set = param_set_aauint,
1320 .get = param_get_aauint
1323 static int param_set_aacompressionlevel(const char *val,
1324 const struct kernel_param *kp);
1325 static int param_get_aacompressionlevel(char *buffer,
1326 const struct kernel_param *kp);
1327 #define param_check_aacompressionlevel param_check_int
1328 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1329 .set = param_set_aacompressionlevel,
1330 .get = param_get_aacompressionlevel
1333 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1334 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1335 #define param_check_aalockpolicy param_check_bool
1336 static const struct kernel_param_ops param_ops_aalockpolicy = {
1337 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1338 .set = param_set_aalockpolicy,
1339 .get = param_get_aalockpolicy
1342 static int param_set_audit(const char *val, const struct kernel_param *kp);
1343 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1345 static int param_set_mode(const char *val, const struct kernel_param *kp);
1346 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1348 /* Flag values, also controllable via /sys/module/apparmor/parameters
1349 * We define special types as we want to do additional mediation.
1352 /* AppArmor global enforcement switch - complain, enforce, kill */
1353 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1354 module_param_call(mode, param_set_mode, param_get_mode,
1355 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1357 /* whether policy verification hashing is enabled */
1358 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1359 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1360 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1363 /* whether policy exactly as loaded is retained for debug and checkpointing */
1364 bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
1365 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1366 module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
1369 /* policy loaddata compression level */
1370 int aa_g_rawdata_compression_level = Z_DEFAULT_COMPRESSION;
1371 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1372 aacompressionlevel, 0400);
1375 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1376 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1379 enum audit_mode aa_g_audit;
1380 module_param_call(audit, param_set_audit, param_get_audit,
1381 &aa_g_audit, S_IRUSR | S_IWUSR);
1383 /* Determines if audit header is included in audited messages. This
1384 * provides more context if the audit daemon is not running
1386 bool aa_g_audit_header = true;
1387 module_param_named(audit_header, aa_g_audit_header, aabool,
1390 /* lock out loading/removal of policy
1391 * TODO: add in at boot loading of policy, which is the only way to
1392 * load policy, if lock_policy is set
1394 bool aa_g_lock_policy;
1395 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1398 /* Syscall logging mode */
1399 bool aa_g_logsyscall;
1400 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1402 /* Maximum pathname length before accesses will start getting rejected */
1403 unsigned int aa_g_path_max = 2 * PATH_MAX;
1404 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1406 /* Determines how paranoid loading of policy is and how much verification
1407 * on the loaded policy is done.
1408 * DEPRECATED: read only as strict checking of load is always done now
1409 * that none root users (user namespaces) can load policy.
1411 bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
1412 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1414 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1415 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1416 #define param_check_aaintbool param_check_int
1417 static const struct kernel_param_ops param_ops_aaintbool = {
1418 .set = param_set_aaintbool,
1419 .get = param_get_aaintbool
1421 /* Boot time disable flag */
1422 static int apparmor_enabled __lsm_ro_after_init = 1;
1423 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1425 static int __init apparmor_enabled_setup(char *str)
1427 unsigned long enabled;
1428 int error = kstrtoul(str, 0, &enabled);
1430 apparmor_enabled = enabled ? 1 : 0;
1434 __setup("apparmor=", apparmor_enabled_setup);
1436 /* set global flag turning off the ability to load policy */
1437 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1439 if (!apparmor_enabled)
1441 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1443 return param_set_bool(val, kp);
1446 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1448 if (!apparmor_enabled)
1450 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1452 return param_get_bool(buffer, kp);
1455 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1457 if (!apparmor_enabled)
1459 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1461 return param_set_bool(val, kp);
1464 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1466 if (!apparmor_enabled)
1468 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1470 return param_get_bool(buffer, kp);
1473 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1477 if (!apparmor_enabled)
1479 /* file is ro but enforce 2nd line check */
1480 if (apparmor_initialized)
1483 error = param_set_uint(val, kp);
1484 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1485 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1490 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1492 if (!apparmor_enabled)
1494 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1496 return param_get_uint(buffer, kp);
1499 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1500 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1502 struct kernel_param kp_local;
1506 if (apparmor_initialized)
1509 /* Create local copy, with arg pointing to bool type. */
1510 value = !!*((int *)kp->arg);
1511 memcpy(&kp_local, kp, sizeof(kp_local));
1512 kp_local.arg = &value;
1514 error = param_set_bool(val, &kp_local);
1516 *((int *)kp->arg) = *((bool *)kp_local.arg);
1521 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1522 * 1/0, this converts the "int that is actually bool" back to bool for
1523 * display in the /sys filesystem, while keeping it "int" for the LSM
1526 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1528 struct kernel_param kp_local;
1531 /* Create local copy, with arg pointing to bool type. */
1532 value = !!*((int *)kp->arg);
1533 memcpy(&kp_local, kp, sizeof(kp_local));
1534 kp_local.arg = &value;
1536 return param_get_bool(buffer, &kp_local);
1539 static int param_set_aacompressionlevel(const char *val,
1540 const struct kernel_param *kp)
1544 if (!apparmor_enabled)
1546 if (apparmor_initialized)
1549 error = param_set_int(val, kp);
1551 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1553 Z_BEST_COMPRESSION);
1554 pr_info("AppArmor: policy rawdata compression level set to %u\n",
1555 aa_g_rawdata_compression_level);
1560 static int param_get_aacompressionlevel(char *buffer,
1561 const struct kernel_param *kp)
1563 if (!apparmor_enabled)
1565 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1567 return param_get_int(buffer, kp);
1570 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1572 if (!apparmor_enabled)
1574 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1576 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1579 static int param_set_audit(const char *val, const struct kernel_param *kp)
1583 if (!apparmor_enabled)
1587 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1590 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1598 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1600 if (!apparmor_enabled)
1602 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1605 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1608 static int param_set_mode(const char *val, const struct kernel_param *kp)
1612 if (!apparmor_enabled)
1616 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1619 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1624 aa_g_profile_mode = i;
1628 char *aa_get_buffer(bool in_atomic)
1630 union aa_buffer *aa_buf;
1631 bool try_again = true;
1632 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1635 spin_lock(&aa_buffers_lock);
1636 if (buffer_count > reserve_count ||
1637 (in_atomic && !list_empty(&aa_global_buffers))) {
1638 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1640 list_del(&aa_buf->list);
1642 spin_unlock(&aa_buffers_lock);
1643 return &aa_buf->buffer[0];
1647 * out of reserve buffers and in atomic context so increase
1648 * how many buffers to keep in reserve
1653 spin_unlock(&aa_buffers_lock);
1657 aa_buf = kmalloc(aa_g_path_max, flags);
1663 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1666 return &aa_buf->buffer[0];
1669 void aa_put_buffer(char *buf)
1671 union aa_buffer *aa_buf;
1675 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1677 spin_lock(&aa_buffers_lock);
1678 list_add(&aa_buf->list, &aa_global_buffers);
1680 spin_unlock(&aa_buffers_lock);
1684 * AppArmor init functions
1688 * set_init_ctx - set a task context and profile on the first task.
1690 * TODO: allow setting an alternate profile than unconfined
1692 static int __init set_init_ctx(void)
1694 struct cred *cred = (__force struct cred *)current->real_cred;
1696 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1701 static void destroy_buffers(void)
1703 union aa_buffer *aa_buf;
1705 spin_lock(&aa_buffers_lock);
1706 while (!list_empty(&aa_global_buffers)) {
1707 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1709 list_del(&aa_buf->list);
1710 spin_unlock(&aa_buffers_lock);
1712 spin_lock(&aa_buffers_lock);
1714 spin_unlock(&aa_buffers_lock);
1717 static int __init alloc_buffers(void)
1719 union aa_buffer *aa_buf;
1723 * A function may require two buffers at once. Usually the buffers are
1724 * used for a short period of time and are shared. On UP kernel buffers
1725 * two should be enough, with more CPUs it is possible that more
1726 * buffers will be used simultaneously. The preallocated pool may grow.
1727 * This preallocation has also the side-effect that AppArmor will be
1728 * disabled early at boot if aa_g_path_max is extremly high.
1730 if (num_online_cpus() > 1)
1731 num = 4 + RESERVE_COUNT;
1733 num = 2 + RESERVE_COUNT;
1735 for (i = 0; i < num; i++) {
1737 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1738 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1743 aa_put_buffer(&aa_buf->buffer[0]);
1748 #ifdef CONFIG_SYSCTL
1749 static int apparmor_dointvec(struct ctl_table *table, int write,
1750 void *buffer, size_t *lenp, loff_t *ppos)
1752 if (!aa_current_policy_admin_capable(NULL))
1754 if (!apparmor_enabled)
1757 return proc_dointvec(table, write, buffer, lenp, ppos);
1760 static struct ctl_path apparmor_sysctl_path[] = {
1761 { .procname = "kernel", },
1765 static struct ctl_table apparmor_sysctl_table[] = {
1767 .procname = "unprivileged_userns_apparmor_policy",
1768 .data = &unprivileged_userns_apparmor_policy,
1769 .maxlen = sizeof(int),
1771 .proc_handler = apparmor_dointvec,
1774 .procname = "apparmor_display_secid_mode",
1775 .data = &apparmor_display_secid_mode,
1776 .maxlen = sizeof(int),
1778 .proc_handler = apparmor_dointvec,
1784 static int __init apparmor_init_sysctl(void)
1786 return register_sysctl_paths(apparmor_sysctl_path,
1787 apparmor_sysctl_table) ? 0 : -ENOMEM;
1790 static inline int apparmor_init_sysctl(void)
1794 #endif /* CONFIG_SYSCTL */
1796 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1797 static unsigned int apparmor_ip_postroute(void *priv,
1798 struct sk_buff *skb,
1799 const struct nf_hook_state *state)
1801 struct aa_sk_ctx *ctx;
1807 sk = skb_to_full_sk(skb);
1812 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1816 return NF_DROP_ERR(-ECONNREFUSED);
1820 static const struct nf_hook_ops apparmor_nf_ops[] = {
1822 .hook = apparmor_ip_postroute,
1824 .hooknum = NF_INET_POST_ROUTING,
1825 .priority = NF_IP_PRI_SELINUX_FIRST,
1827 #if IS_ENABLED(CONFIG_IPV6)
1829 .hook = apparmor_ip_postroute,
1831 .hooknum = NF_INET_POST_ROUTING,
1832 .priority = NF_IP6_PRI_SELINUX_FIRST,
1837 static int __net_init apparmor_nf_register(struct net *net)
1839 return nf_register_net_hooks(net, apparmor_nf_ops,
1840 ARRAY_SIZE(apparmor_nf_ops));
1843 static void __net_exit apparmor_nf_unregister(struct net *net)
1845 nf_unregister_net_hooks(net, apparmor_nf_ops,
1846 ARRAY_SIZE(apparmor_nf_ops));
1849 static struct pernet_operations apparmor_net_ops = {
1850 .init = apparmor_nf_register,
1851 .exit = apparmor_nf_unregister,
1854 static int __init apparmor_nf_ip_init(void)
1858 if (!apparmor_enabled)
1861 err = register_pernet_subsys(&apparmor_net_ops);
1863 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1867 __initcall(apparmor_nf_ip_init);
1870 static int __init apparmor_init(void)
1874 error = aa_setup_dfa_engine();
1876 AA_ERROR("Unable to setup dfa engine\n");
1880 error = aa_alloc_root_ns();
1882 AA_ERROR("Unable to allocate default profile namespace\n");
1886 error = apparmor_init_sysctl();
1888 AA_ERROR("Unable to register sysctls\n");
1893 error = alloc_buffers();
1895 AA_ERROR("Unable to allocate work buffers\n");
1899 error = set_init_ctx();
1901 AA_ERROR("Failed to set context on init task\n");
1905 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1908 /* Report that AppArmor successfully initialized */
1909 apparmor_initialized = 1;
1910 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1911 aa_info_message("AppArmor initialized: complain mode enabled");
1912 else if (aa_g_profile_mode == APPARMOR_KILL)
1913 aa_info_message("AppArmor initialized: kill mode enabled");
1915 aa_info_message("AppArmor initialized");
1923 aa_teardown_dfa_engine();
1925 apparmor_enabled = false;
1929 DEFINE_LSM(apparmor) = {
1931 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1932 .enabled = &apparmor_enabled,
1933 .blobs = &apparmor_blob_sizes,
1934 .init = apparmor_init,