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/zstd.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;
49 DECLARE_FLEX_ARRAY(char, buffer);
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;
119 const struct cred *cred;
122 cred = get_task_cred(child);
123 tracee = cred_label(cred); /* ref count on cred */
124 tracer = __begin_current_label_crit_section();
125 error = aa_may_ptrace(current_cred(), tracer, cred, tracee,
126 (mode & PTRACE_MODE_READ) ? AA_PTRACE_READ
128 __end_current_label_crit_section(tracer);
134 static int apparmor_ptrace_traceme(struct task_struct *parent)
136 struct aa_label *tracer, *tracee;
137 const struct cred *cred;
140 tracee = __begin_current_label_crit_section();
141 cred = get_task_cred(parent);
142 tracer = cred_label(cred); /* ref count on cred */
143 error = aa_may_ptrace(cred, tracer, current_cred(), tracee,
146 __end_current_label_crit_section(tracee);
151 /* Derived from security/commoncap.c:cap_capget */
152 static int apparmor_capget(const struct task_struct *target, kernel_cap_t *effective,
153 kernel_cap_t *inheritable, kernel_cap_t *permitted)
155 struct aa_label *label;
156 const struct cred *cred;
159 cred = __task_cred(target);
160 label = aa_get_newest_cred_label(cred);
163 * cap_capget is stacked ahead of this and will
164 * initialize effective and permitted.
166 if (!unconfined(label)) {
167 struct aa_profile *profile;
170 label_for_each_confined(i, label, profile) {
171 struct aa_ruleset *rules;
172 if (COMPLAIN_MODE(profile))
174 rules = list_first_entry(&profile->rules,
175 typeof(*rules), list);
176 *effective = cap_intersect(*effective,
178 *permitted = cap_intersect(*permitted,
188 static int apparmor_capable(const struct cred *cred, struct user_namespace *ns,
189 int cap, unsigned int opts)
191 struct aa_label *label;
194 label = aa_get_newest_cred_label(cred);
195 if (!unconfined(label))
196 error = aa_capable(cred, label, cap, opts);
203 * common_perm - basic common permission check wrapper fn for paths
204 * @op: operation being checked
205 * @path: path to check permission of (NOT NULL)
206 * @mask: requested permissions mask
207 * @cond: conditional info for the permission request (NOT NULL)
209 * Returns: %0 else error code if error or permission denied
211 static int common_perm(const char *op, const struct path *path, u32 mask,
212 struct path_cond *cond)
214 struct aa_label *label;
217 label = __begin_current_label_crit_section();
218 if (!unconfined(label))
219 error = aa_path_perm(op, current_cred(), label, path, 0, mask,
221 __end_current_label_crit_section(label);
227 * common_perm_cond - common permission wrapper around inode cond
228 * @op: operation being checked
229 * @path: location to check (NOT NULL)
230 * @mask: requested permissions mask
232 * Returns: %0 else error code if error or permission denied
234 static int common_perm_cond(const char *op, const struct path *path, u32 mask)
236 vfsuid_t vfsuid = i_uid_into_vfsuid(mnt_idmap(path->mnt),
237 d_backing_inode(path->dentry));
238 struct path_cond cond = {
239 vfsuid_into_kuid(vfsuid),
240 d_backing_inode(path->dentry)->i_mode
243 if (!path_mediated_fs(path->dentry))
246 return common_perm(op, path, mask, &cond);
250 * common_perm_dir_dentry - common permission wrapper when path is dir, dentry
251 * @op: operation being checked
252 * @dir: directory of the dentry (NOT NULL)
253 * @dentry: dentry to check (NOT NULL)
254 * @mask: requested permissions mask
255 * @cond: conditional info for the permission request (NOT NULL)
257 * Returns: %0 else error code if error or permission denied
259 static int common_perm_dir_dentry(const char *op, const struct path *dir,
260 struct dentry *dentry, u32 mask,
261 struct path_cond *cond)
263 struct path path = { .mnt = dir->mnt, .dentry = dentry };
265 return common_perm(op, &path, mask, cond);
269 * common_perm_rm - common permission wrapper for operations doing rm
270 * @op: operation being checked
271 * @dir: directory that the dentry is in (NOT NULL)
272 * @dentry: dentry being rm'd (NOT NULL)
273 * @mask: requested permission mask
275 * Returns: %0 else error code if error or permission denied
277 static int common_perm_rm(const char *op, const struct path *dir,
278 struct dentry *dentry, u32 mask)
280 struct inode *inode = d_backing_inode(dentry);
281 struct path_cond cond = { };
284 if (!inode || !path_mediated_fs(dentry))
287 vfsuid = i_uid_into_vfsuid(mnt_idmap(dir->mnt), inode);
288 cond.uid = vfsuid_into_kuid(vfsuid);
289 cond.mode = inode->i_mode;
291 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
295 * common_perm_create - common permission wrapper for operations doing create
296 * @op: operation being checked
297 * @dir: directory that dentry will be created in (NOT NULL)
298 * @dentry: dentry to create (NOT NULL)
299 * @mask: request permission mask
300 * @mode: created file mode
302 * Returns: %0 else error code if error or permission denied
304 static int common_perm_create(const char *op, const struct path *dir,
305 struct dentry *dentry, u32 mask, umode_t mode)
307 struct path_cond cond = { current_fsuid(), mode };
309 if (!path_mediated_fs(dir->dentry))
312 return common_perm_dir_dentry(op, dir, dentry, mask, &cond);
315 static int apparmor_path_unlink(const struct path *dir, struct dentry *dentry)
317 return common_perm_rm(OP_UNLINK, dir, dentry, AA_MAY_DELETE);
320 static int apparmor_path_mkdir(const struct path *dir, struct dentry *dentry,
323 return common_perm_create(OP_MKDIR, dir, dentry, AA_MAY_CREATE,
327 static int apparmor_path_rmdir(const struct path *dir, struct dentry *dentry)
329 return common_perm_rm(OP_RMDIR, dir, dentry, AA_MAY_DELETE);
332 static int apparmor_path_mknod(const struct path *dir, struct dentry *dentry,
333 umode_t mode, unsigned int dev)
335 return common_perm_create(OP_MKNOD, dir, dentry, AA_MAY_CREATE, mode);
338 static int apparmor_path_truncate(const struct path *path)
340 return common_perm_cond(OP_TRUNC, path, MAY_WRITE | AA_MAY_SETATTR);
343 static int apparmor_file_truncate(struct file *file)
345 return apparmor_path_truncate(&file->f_path);
348 static int apparmor_path_symlink(const struct path *dir, struct dentry *dentry,
349 const char *old_name)
351 return common_perm_create(OP_SYMLINK, dir, dentry, AA_MAY_CREATE,
355 static int apparmor_path_link(struct dentry *old_dentry, const struct path *new_dir,
356 struct dentry *new_dentry)
358 struct aa_label *label;
361 if (!path_mediated_fs(old_dentry))
364 label = begin_current_label_crit_section();
365 if (!unconfined(label))
366 error = aa_path_link(current_cred(), label, old_dentry, new_dir,
368 end_current_label_crit_section(label);
373 static int apparmor_path_rename(const struct path *old_dir, struct dentry *old_dentry,
374 const struct path *new_dir, struct dentry *new_dentry,
375 const unsigned int flags)
377 struct aa_label *label;
380 if (!path_mediated_fs(old_dentry))
382 if ((flags & RENAME_EXCHANGE) && !path_mediated_fs(new_dentry))
385 label = begin_current_label_crit_section();
386 if (!unconfined(label)) {
387 struct mnt_idmap *idmap = mnt_idmap(old_dir->mnt);
389 struct path old_path = { .mnt = old_dir->mnt,
390 .dentry = old_dentry };
391 struct path new_path = { .mnt = new_dir->mnt,
392 .dentry = new_dentry };
393 struct path_cond cond = {
394 .mode = d_backing_inode(old_dentry)->i_mode
396 vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry));
397 cond.uid = vfsuid_into_kuid(vfsuid);
399 if (flags & RENAME_EXCHANGE) {
400 struct path_cond cond_exchange = {
401 .mode = d_backing_inode(new_dentry)->i_mode,
403 vfsuid = i_uid_into_vfsuid(idmap, d_backing_inode(old_dentry));
404 cond_exchange.uid = vfsuid_into_kuid(vfsuid);
406 error = aa_path_perm(OP_RENAME_SRC, current_cred(),
408 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
409 AA_MAY_SETATTR | AA_MAY_DELETE,
412 error = aa_path_perm(OP_RENAME_DEST, current_cred(),
414 0, MAY_WRITE | AA_MAY_SETATTR |
415 AA_MAY_CREATE, &cond_exchange);
419 error = aa_path_perm(OP_RENAME_SRC, current_cred(),
421 MAY_READ | AA_MAY_GETATTR | MAY_WRITE |
422 AA_MAY_SETATTR | AA_MAY_DELETE,
425 error = aa_path_perm(OP_RENAME_DEST, current_cred(),
427 0, MAY_WRITE | AA_MAY_SETATTR |
428 AA_MAY_CREATE, &cond);
431 end_current_label_crit_section(label);
436 static int apparmor_path_chmod(const struct path *path, umode_t mode)
438 return common_perm_cond(OP_CHMOD, path, AA_MAY_CHMOD);
441 static int apparmor_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
443 return common_perm_cond(OP_CHOWN, path, AA_MAY_CHOWN);
446 static int apparmor_inode_getattr(const struct path *path)
448 return common_perm_cond(OP_GETATTR, path, AA_MAY_GETATTR);
451 static int apparmor_file_open(struct file *file)
453 struct aa_file_ctx *fctx = file_ctx(file);
454 struct aa_label *label;
457 if (!path_mediated_fs(file->f_path.dentry))
460 /* If in exec, permission is handled by bprm hooks.
461 * Cache permissions granted by the previous exec check, with
462 * implicit read and executable mmap which are required to
463 * actually execute the image.
465 if (current->in_execve) {
466 fctx->allow = MAY_EXEC | MAY_READ | AA_EXEC_MMAP;
470 label = aa_get_newest_cred_label(file->f_cred);
471 if (!unconfined(label)) {
472 struct mnt_idmap *idmap = file_mnt_idmap(file);
473 struct inode *inode = file_inode(file);
475 struct path_cond cond = {
476 .mode = inode->i_mode,
478 vfsuid = i_uid_into_vfsuid(idmap, inode);
479 cond.uid = vfsuid_into_kuid(vfsuid);
481 error = aa_path_perm(OP_OPEN, file->f_cred,
482 label, &file->f_path, 0,
483 aa_map_file_to_perms(file), &cond);
484 /* todo cache full allowed permissions set and state */
485 fctx->allow = aa_map_file_to_perms(file);
492 static int apparmor_file_alloc_security(struct file *file)
494 struct aa_file_ctx *ctx = file_ctx(file);
495 struct aa_label *label = begin_current_label_crit_section();
497 spin_lock_init(&ctx->lock);
498 rcu_assign_pointer(ctx->label, aa_get_label(label));
499 end_current_label_crit_section(label);
503 static void apparmor_file_free_security(struct file *file)
505 struct aa_file_ctx *ctx = file_ctx(file);
508 aa_put_label(rcu_access_pointer(ctx->label));
511 static int common_file_perm(const char *op, struct file *file, u32 mask,
514 struct aa_label *label;
517 /* don't reaudit files closed during inheritance */
518 if (file->f_path.dentry == aa_null.dentry)
521 label = __begin_current_label_crit_section();
522 error = aa_file_perm(op, current_cred(), label, file, mask, in_atomic);
523 __end_current_label_crit_section(label);
528 static int apparmor_file_receive(struct file *file)
530 return common_file_perm(OP_FRECEIVE, file, aa_map_file_to_perms(file),
534 static int apparmor_file_permission(struct file *file, int mask)
536 return common_file_perm(OP_FPERM, file, mask, false);
539 static int apparmor_file_lock(struct file *file, unsigned int cmd)
541 u32 mask = AA_MAY_LOCK;
546 return common_file_perm(OP_FLOCK, file, mask, false);
549 static int common_mmap(const char *op, struct file *file, unsigned long prot,
550 unsigned long flags, bool in_atomic)
554 if (!file || !file_ctx(file))
557 if (prot & PROT_READ)
560 * Private mappings don't require write perms since they don't
561 * write back to the files
563 if ((prot & PROT_WRITE) && !(flags & MAP_PRIVATE))
565 if (prot & PROT_EXEC)
566 mask |= AA_EXEC_MMAP;
568 return common_file_perm(op, file, mask, in_atomic);
571 static int apparmor_mmap_file(struct file *file, unsigned long reqprot,
572 unsigned long prot, unsigned long flags)
574 return common_mmap(OP_FMMAP, file, prot, flags, GFP_ATOMIC);
577 static int apparmor_file_mprotect(struct vm_area_struct *vma,
578 unsigned long reqprot, unsigned long prot)
580 return common_mmap(OP_FMPROT, vma->vm_file, prot,
581 !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0,
585 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
586 const char *type, unsigned long flags, void *data)
588 struct aa_label *label;
592 if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
593 flags &= ~MS_MGC_MSK;
595 flags &= ~AA_MS_IGNORE_MASK;
597 label = __begin_current_label_crit_section();
598 if (!unconfined(label)) {
599 if (flags & MS_REMOUNT)
600 error = aa_remount(current_cred(), label, path, flags,
602 else if (flags & MS_BIND)
603 error = aa_bind_mount(current_cred(), label, path,
605 else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE |
607 error = aa_mount_change_type(current_cred(), label,
609 else if (flags & MS_MOVE)
610 error = aa_move_mount(current_cred(), label, path,
613 error = aa_new_mount(current_cred(), label, dev_name,
614 path, type, flags, data);
616 __end_current_label_crit_section(label);
621 static int apparmor_sb_umount(struct vfsmount *mnt, int flags)
623 struct aa_label *label;
626 label = __begin_current_label_crit_section();
627 if (!unconfined(label))
628 error = aa_umount(current_cred(), label, mnt, flags);
629 __end_current_label_crit_section(label);
634 static int apparmor_sb_pivotroot(const struct path *old_path,
635 const struct path *new_path)
637 struct aa_label *label;
640 label = aa_get_current_label();
641 if (!unconfined(label))
642 error = aa_pivotroot(current_cred(), label, old_path, new_path);
648 static int apparmor_getprocattr(struct task_struct *task, const char *name,
653 const struct cred *cred = get_task_cred(task);
654 struct aa_task_ctx *ctx = task_ctx(current);
655 struct aa_label *label = NULL;
657 if (strcmp(name, "current") == 0)
658 label = aa_get_newest_label(cred_label(cred));
659 else if (strcmp(name, "prev") == 0 && ctx->previous)
660 label = aa_get_newest_label(ctx->previous);
661 else if (strcmp(name, "exec") == 0 && ctx->onexec)
662 label = aa_get_newest_label(ctx->onexec);
667 error = aa_getprocattr(label, value);
675 static int apparmor_setprocattr(const char *name, void *value,
678 char *command, *largs = NULL, *args = value;
681 DEFINE_AUDIT_DATA(ad, LSM_AUDIT_DATA_NONE, AA_CLASS_NONE,
687 /* AppArmor requires that the buffer must be null terminated atm */
688 if (args[size - 1] != '\0') {
690 largs = args = kmalloc(size + 1, GFP_KERNEL);
693 memcpy(args, value, size);
699 command = strsep(&args, " ");
702 args = skip_spaces(args);
706 arg_size = size - (args - (largs ? largs : (char *) value));
707 if (strcmp(name, "current") == 0) {
708 if (strcmp(command, "changehat") == 0) {
709 error = aa_setprocattr_changehat(args, arg_size,
711 } else if (strcmp(command, "permhat") == 0) {
712 error = aa_setprocattr_changehat(args, arg_size,
714 } else if (strcmp(command, "changeprofile") == 0) {
715 error = aa_change_profile(args, AA_CHANGE_NOFLAGS);
716 } else if (strcmp(command, "permprofile") == 0) {
717 error = aa_change_profile(args, AA_CHANGE_TEST);
718 } else if (strcmp(command, "stack") == 0) {
719 error = aa_change_profile(args, AA_CHANGE_STACK);
722 } else if (strcmp(name, "exec") == 0) {
723 if (strcmp(command, "exec") == 0)
724 error = aa_change_profile(args, AA_CHANGE_ONEXEC);
725 else if (strcmp(command, "stack") == 0)
726 error = aa_change_profile(args, (AA_CHANGE_ONEXEC |
731 /* only support the "current" and "exec" process attributes */
741 ad.subj_label = begin_current_label_crit_section();
743 ad.error = error = -EINVAL;
744 aa_audit_msg(AUDIT_APPARMOR_DENIED, &ad, NULL);
745 end_current_label_crit_section(ad.subj_label);
750 * apparmor_bprm_committing_creds - do task cleanup on committing new creds
751 * @bprm: binprm for the exec (NOT NULL)
753 static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
755 struct aa_label *label = aa_current_raw_label();
756 struct aa_label *new_label = cred_label(bprm->cred);
758 /* bail out if unconfined or not changing profile */
759 if ((new_label->proxy == label->proxy) ||
760 (unconfined(new_label)))
763 aa_inherit_files(bprm->cred, current->files);
765 current->pdeath_signal = 0;
767 /* reset soft limits and set hard limits for the new label */
768 __aa_transition_rlimits(label, new_label);
772 * apparmor_bprm_committed_creds() - do cleanup after new creds committed
773 * @bprm: binprm for the exec (NOT NULL)
775 static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
777 /* clear out temporary/transitional state from the context */
778 aa_clear_task_ctx_trans(task_ctx(current));
783 static void apparmor_current_getsecid_subj(u32 *secid)
785 struct aa_label *label = aa_get_current_label();
786 *secid = label->secid;
790 static void apparmor_task_getsecid_obj(struct task_struct *p, u32 *secid)
792 struct aa_label *label = aa_get_task_label(p);
793 *secid = label->secid;
797 static int apparmor_task_setrlimit(struct task_struct *task,
798 unsigned int resource, struct rlimit *new_rlim)
800 struct aa_label *label = __begin_current_label_crit_section();
803 if (!unconfined(label))
804 error = aa_task_setrlimit(current_cred(), label, task,
806 __end_current_label_crit_section(label);
811 static int apparmor_task_kill(struct task_struct *target, struct kernel_siginfo *info,
812 int sig, const struct cred *cred)
814 const struct cred *tc;
815 struct aa_label *cl, *tl;
818 tc = get_task_cred(target);
819 tl = aa_get_newest_cred_label(tc);
822 * Dealing with USB IO specific behavior
824 cl = aa_get_newest_cred_label(cred);
825 error = aa_may_signal(cred, cl, tc, tl, sig);
829 cl = __begin_current_label_crit_section();
830 error = aa_may_signal(current_cred(), cl, tc, tl, sig);
831 __end_current_label_crit_section(cl);
840 * apparmor_sk_alloc_security - allocate and attach the sk_security field
842 static int apparmor_sk_alloc_security(struct sock *sk, int family, gfp_t flags)
844 struct aa_sk_ctx *ctx;
846 ctx = kzalloc(sizeof(*ctx), flags);
856 * apparmor_sk_free_security - free the sk_security field
858 static void apparmor_sk_free_security(struct sock *sk)
860 struct aa_sk_ctx *ctx = SK_CTX(sk);
863 aa_put_label(ctx->label);
864 aa_put_label(ctx->peer);
869 * apparmor_sk_clone_security - clone the sk_security field
871 static void apparmor_sk_clone_security(const struct sock *sk,
874 struct aa_sk_ctx *ctx = SK_CTX(sk);
875 struct aa_sk_ctx *new = SK_CTX(newsk);
878 aa_put_label(new->label);
879 new->label = aa_get_label(ctx->label);
882 aa_put_label(new->peer);
883 new->peer = aa_get_label(ctx->peer);
887 * apparmor_socket_create - check perms before creating a new socket
889 static int apparmor_socket_create(int family, int type, int protocol, int kern)
891 struct aa_label *label;
894 AA_BUG(in_interrupt());
896 label = begin_current_label_crit_section();
897 if (!(kern || unconfined(label)))
898 error = af_select(family,
899 create_perm(label, family, type, protocol),
900 aa_af_perm(current_cred(), label,
901 OP_CREATE, AA_MAY_CREATE,
902 family, type, protocol));
903 end_current_label_crit_section(label);
909 * apparmor_socket_post_create - setup the per-socket security struct
912 * - kernel sockets currently labeled unconfined but we may want to
913 * move to a special kernel label
914 * - socket may not have sk here if created with sock_create_lite or
915 * sock_alloc. These should be accept cases which will be handled in
918 static int apparmor_socket_post_create(struct socket *sock, int family,
919 int type, int protocol, int kern)
921 struct aa_label *label;
924 label = aa_get_label(kernel_t);
926 label = aa_get_current_label();
929 struct aa_sk_ctx *ctx = SK_CTX(sock->sk);
931 aa_put_label(ctx->label);
932 ctx->label = aa_get_label(label);
940 * apparmor_socket_bind - check perms before bind addr to socket
942 static int apparmor_socket_bind(struct socket *sock,
943 struct sockaddr *address, int addrlen)
948 AA_BUG(in_interrupt());
950 return af_select(sock->sk->sk_family,
951 bind_perm(sock, address, addrlen),
952 aa_sk_perm(OP_BIND, AA_MAY_BIND, sock->sk));
956 * apparmor_socket_connect - check perms before connecting @sock to @address
958 static int apparmor_socket_connect(struct socket *sock,
959 struct sockaddr *address, int addrlen)
964 AA_BUG(in_interrupt());
966 return af_select(sock->sk->sk_family,
967 connect_perm(sock, address, addrlen),
968 aa_sk_perm(OP_CONNECT, AA_MAY_CONNECT, sock->sk));
972 * apparmor_socket_listen - check perms before allowing listen
974 static int apparmor_socket_listen(struct socket *sock, int backlog)
978 AA_BUG(in_interrupt());
980 return af_select(sock->sk->sk_family,
981 listen_perm(sock, backlog),
982 aa_sk_perm(OP_LISTEN, AA_MAY_LISTEN, sock->sk));
986 * apparmor_socket_accept - check perms before accepting a new connection.
988 * Note: while @newsock is created and has some information, the accept
991 static int apparmor_socket_accept(struct socket *sock, struct socket *newsock)
996 AA_BUG(in_interrupt());
998 return af_select(sock->sk->sk_family,
999 accept_perm(sock, newsock),
1000 aa_sk_perm(OP_ACCEPT, AA_MAY_ACCEPT, sock->sk));
1003 static int aa_sock_msg_perm(const char *op, u32 request, struct socket *sock,
1004 struct msghdr *msg, int size)
1009 AA_BUG(in_interrupt());
1011 return af_select(sock->sk->sk_family,
1012 msg_perm(op, request, sock, msg, size),
1013 aa_sk_perm(op, request, sock->sk));
1017 * apparmor_socket_sendmsg - check perms before sending msg to another socket
1019 static int apparmor_socket_sendmsg(struct socket *sock,
1020 struct msghdr *msg, int size)
1022 return aa_sock_msg_perm(OP_SENDMSG, AA_MAY_SEND, sock, msg, size);
1026 * apparmor_socket_recvmsg - check perms before receiving a message
1028 static int apparmor_socket_recvmsg(struct socket *sock,
1029 struct msghdr *msg, int size, int flags)
1031 return aa_sock_msg_perm(OP_RECVMSG, AA_MAY_RECEIVE, sock, msg, size);
1034 /* revaliation, get/set attr, shutdown */
1035 static int aa_sock_perm(const char *op, u32 request, struct socket *sock)
1039 AA_BUG(in_interrupt());
1041 return af_select(sock->sk->sk_family,
1042 sock_perm(op, request, sock),
1043 aa_sk_perm(op, request, sock->sk));
1047 * apparmor_socket_getsockname - check perms before getting the local address
1049 static int apparmor_socket_getsockname(struct socket *sock)
1051 return aa_sock_perm(OP_GETSOCKNAME, AA_MAY_GETATTR, sock);
1055 * apparmor_socket_getpeername - check perms before getting remote address
1057 static int apparmor_socket_getpeername(struct socket *sock)
1059 return aa_sock_perm(OP_GETPEERNAME, AA_MAY_GETATTR, sock);
1062 /* revaliation, get/set attr, opt */
1063 static int aa_sock_opt_perm(const char *op, u32 request, struct socket *sock,
1064 int level, int optname)
1068 AA_BUG(in_interrupt());
1070 return af_select(sock->sk->sk_family,
1071 opt_perm(op, request, sock, level, optname),
1072 aa_sk_perm(op, request, sock->sk));
1076 * apparmor_socket_getsockopt - check perms before getting socket options
1078 static int apparmor_socket_getsockopt(struct socket *sock, int level,
1081 return aa_sock_opt_perm(OP_GETSOCKOPT, AA_MAY_GETOPT, sock,
1086 * apparmor_socket_setsockopt - check perms before setting socket options
1088 static int apparmor_socket_setsockopt(struct socket *sock, int level,
1091 return aa_sock_opt_perm(OP_SETSOCKOPT, AA_MAY_SETOPT, sock,
1096 * apparmor_socket_shutdown - check perms before shutting down @sock conn
1098 static int apparmor_socket_shutdown(struct socket *sock, int how)
1100 return aa_sock_perm(OP_SHUTDOWN, AA_MAY_SHUTDOWN, sock);
1103 #ifdef CONFIG_NETWORK_SECMARK
1105 * apparmor_socket_sock_rcv_skb - check perms before associating skb to sk
1107 * Note: can not sleep may be called with locks held
1109 * dont want protocol specific in __skb_recv_datagram()
1110 * to deny an incoming connection socket_sock_rcv_skb()
1112 static int apparmor_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
1114 struct aa_sk_ctx *ctx = SK_CTX(sk);
1119 return apparmor_secmark_check(ctx->label, OP_RECVMSG, AA_MAY_RECEIVE,
1125 static struct aa_label *sk_peer_label(struct sock *sk)
1127 struct aa_sk_ctx *ctx = SK_CTX(sk);
1132 return ERR_PTR(-ENOPROTOOPT);
1136 * apparmor_socket_getpeersec_stream - get security context of peer
1138 * Note: for tcp only valid if using ipsec or cipso on lan
1140 static int apparmor_socket_getpeersec_stream(struct socket *sock,
1141 sockptr_t optval, sockptr_t optlen,
1145 int slen, error = 0;
1146 struct aa_label *label;
1147 struct aa_label *peer;
1149 label = begin_current_label_crit_section();
1150 peer = sk_peer_label(sock->sk);
1152 error = PTR_ERR(peer);
1155 slen = aa_label_asxprint(&name, labels_ns(label), peer,
1156 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
1157 FLAG_HIDDEN_UNCONFINED, GFP_KERNEL);
1158 /* don't include terminating \0 in slen, it breaks some apps */
1168 if (copy_to_sockptr(optval, name, slen))
1171 if (copy_to_sockptr(optlen, &slen, sizeof(slen)))
1174 end_current_label_crit_section(label);
1180 * apparmor_socket_getpeersec_dgram - get security label of packet
1181 * @sock: the peer socket
1183 * @secid: pointer to where to put the secid of the packet
1185 * Sets the netlabel socket state on sk from parent
1187 static int apparmor_socket_getpeersec_dgram(struct socket *sock,
1188 struct sk_buff *skb, u32 *secid)
1191 /* TODO: requires secid support */
1192 return -ENOPROTOOPT;
1196 * apparmor_sock_graft - Initialize newly created socket
1198 * @parent: parent socket
1200 * Note: could set off of SOCK_CTX(parent) but need to track inode and we can
1201 * just set sk security information off of current creating process label
1202 * Labeling of sk for accept case - probably should be sock based
1203 * instead of task, because of the case where an implicitly labeled
1204 * socket is shared by different tasks.
1206 static void apparmor_sock_graft(struct sock *sk, struct socket *parent)
1208 struct aa_sk_ctx *ctx = SK_CTX(sk);
1211 ctx->label = aa_get_current_label();
1214 #ifdef CONFIG_NETWORK_SECMARK
1215 static int apparmor_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
1216 struct request_sock *req)
1218 struct aa_sk_ctx *ctx = SK_CTX(sk);
1223 return apparmor_secmark_check(ctx->label, OP_CONNECT, AA_MAY_CONNECT,
1229 * The cred blob is a pointer to, not an instance of, an aa_label.
1231 struct lsm_blob_sizes apparmor_blob_sizes __ro_after_init = {
1232 .lbs_cred = sizeof(struct aa_label *),
1233 .lbs_file = sizeof(struct aa_file_ctx),
1234 .lbs_task = sizeof(struct aa_task_ctx),
1237 static struct security_hook_list apparmor_hooks[] __ro_after_init = {
1238 LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check),
1239 LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme),
1240 LSM_HOOK_INIT(capget, apparmor_capget),
1241 LSM_HOOK_INIT(capable, apparmor_capable),
1243 LSM_HOOK_INIT(sb_mount, apparmor_sb_mount),
1244 LSM_HOOK_INIT(sb_umount, apparmor_sb_umount),
1245 LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot),
1247 LSM_HOOK_INIT(path_link, apparmor_path_link),
1248 LSM_HOOK_INIT(path_unlink, apparmor_path_unlink),
1249 LSM_HOOK_INIT(path_symlink, apparmor_path_symlink),
1250 LSM_HOOK_INIT(path_mkdir, apparmor_path_mkdir),
1251 LSM_HOOK_INIT(path_rmdir, apparmor_path_rmdir),
1252 LSM_HOOK_INIT(path_mknod, apparmor_path_mknod),
1253 LSM_HOOK_INIT(path_rename, apparmor_path_rename),
1254 LSM_HOOK_INIT(path_chmod, apparmor_path_chmod),
1255 LSM_HOOK_INIT(path_chown, apparmor_path_chown),
1256 LSM_HOOK_INIT(path_truncate, apparmor_path_truncate),
1257 LSM_HOOK_INIT(inode_getattr, apparmor_inode_getattr),
1259 LSM_HOOK_INIT(file_open, apparmor_file_open),
1260 LSM_HOOK_INIT(file_receive, apparmor_file_receive),
1261 LSM_HOOK_INIT(file_permission, apparmor_file_permission),
1262 LSM_HOOK_INIT(file_alloc_security, apparmor_file_alloc_security),
1263 LSM_HOOK_INIT(file_free_security, apparmor_file_free_security),
1264 LSM_HOOK_INIT(mmap_file, apparmor_mmap_file),
1265 LSM_HOOK_INIT(file_mprotect, apparmor_file_mprotect),
1266 LSM_HOOK_INIT(file_lock, apparmor_file_lock),
1267 LSM_HOOK_INIT(file_truncate, apparmor_file_truncate),
1269 LSM_HOOK_INIT(getprocattr, apparmor_getprocattr),
1270 LSM_HOOK_INIT(setprocattr, apparmor_setprocattr),
1272 LSM_HOOK_INIT(sk_alloc_security, apparmor_sk_alloc_security),
1273 LSM_HOOK_INIT(sk_free_security, apparmor_sk_free_security),
1274 LSM_HOOK_INIT(sk_clone_security, apparmor_sk_clone_security),
1276 LSM_HOOK_INIT(socket_create, apparmor_socket_create),
1277 LSM_HOOK_INIT(socket_post_create, apparmor_socket_post_create),
1278 LSM_HOOK_INIT(socket_bind, apparmor_socket_bind),
1279 LSM_HOOK_INIT(socket_connect, apparmor_socket_connect),
1280 LSM_HOOK_INIT(socket_listen, apparmor_socket_listen),
1281 LSM_HOOK_INIT(socket_accept, apparmor_socket_accept),
1282 LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg),
1283 LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg),
1284 LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname),
1285 LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername),
1286 LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt),
1287 LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt),
1288 LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown),
1289 #ifdef CONFIG_NETWORK_SECMARK
1290 LSM_HOOK_INIT(socket_sock_rcv_skb, apparmor_socket_sock_rcv_skb),
1292 LSM_HOOK_INIT(socket_getpeersec_stream,
1293 apparmor_socket_getpeersec_stream),
1294 LSM_HOOK_INIT(socket_getpeersec_dgram,
1295 apparmor_socket_getpeersec_dgram),
1296 LSM_HOOK_INIT(sock_graft, apparmor_sock_graft),
1297 #ifdef CONFIG_NETWORK_SECMARK
1298 LSM_HOOK_INIT(inet_conn_request, apparmor_inet_conn_request),
1301 LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank),
1302 LSM_HOOK_INIT(cred_free, apparmor_cred_free),
1303 LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare),
1304 LSM_HOOK_INIT(cred_transfer, apparmor_cred_transfer),
1306 LSM_HOOK_INIT(bprm_creds_for_exec, apparmor_bprm_creds_for_exec),
1307 LSM_HOOK_INIT(bprm_committing_creds, apparmor_bprm_committing_creds),
1308 LSM_HOOK_INIT(bprm_committed_creds, apparmor_bprm_committed_creds),
1310 LSM_HOOK_INIT(task_free, apparmor_task_free),
1311 LSM_HOOK_INIT(task_alloc, apparmor_task_alloc),
1312 LSM_HOOK_INIT(current_getsecid_subj, apparmor_current_getsecid_subj),
1313 LSM_HOOK_INIT(task_getsecid_obj, apparmor_task_getsecid_obj),
1314 LSM_HOOK_INIT(task_setrlimit, apparmor_task_setrlimit),
1315 LSM_HOOK_INIT(task_kill, apparmor_task_kill),
1318 LSM_HOOK_INIT(audit_rule_init, aa_audit_rule_init),
1319 LSM_HOOK_INIT(audit_rule_known, aa_audit_rule_known),
1320 LSM_HOOK_INIT(audit_rule_match, aa_audit_rule_match),
1321 LSM_HOOK_INIT(audit_rule_free, aa_audit_rule_free),
1324 LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
1325 LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
1326 LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
1330 * AppArmor sysfs module parameters
1333 static int param_set_aabool(const char *val, const struct kernel_param *kp);
1334 static int param_get_aabool(char *buffer, const struct kernel_param *kp);
1335 #define param_check_aabool param_check_bool
1336 static const struct kernel_param_ops param_ops_aabool = {
1337 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1338 .set = param_set_aabool,
1339 .get = param_get_aabool
1342 static int param_set_aauint(const char *val, const struct kernel_param *kp);
1343 static int param_get_aauint(char *buffer, const struct kernel_param *kp);
1344 #define param_check_aauint param_check_uint
1345 static const struct kernel_param_ops param_ops_aauint = {
1346 .set = param_set_aauint,
1347 .get = param_get_aauint
1350 static int param_set_aacompressionlevel(const char *val,
1351 const struct kernel_param *kp);
1352 static int param_get_aacompressionlevel(char *buffer,
1353 const struct kernel_param *kp);
1354 #define param_check_aacompressionlevel param_check_int
1355 static const struct kernel_param_ops param_ops_aacompressionlevel = {
1356 .set = param_set_aacompressionlevel,
1357 .get = param_get_aacompressionlevel
1360 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp);
1361 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp);
1362 #define param_check_aalockpolicy param_check_bool
1363 static const struct kernel_param_ops param_ops_aalockpolicy = {
1364 .flags = KERNEL_PARAM_OPS_FL_NOARG,
1365 .set = param_set_aalockpolicy,
1366 .get = param_get_aalockpolicy
1369 static int param_set_audit(const char *val, const struct kernel_param *kp);
1370 static int param_get_audit(char *buffer, const struct kernel_param *kp);
1372 static int param_set_mode(const char *val, const struct kernel_param *kp);
1373 static int param_get_mode(char *buffer, const struct kernel_param *kp);
1375 /* Flag values, also controllable via /sys/module/apparmor/parameters
1376 * We define special types as we want to do additional mediation.
1379 /* AppArmor global enforcement switch - complain, enforce, kill */
1380 enum profile_mode aa_g_profile_mode = APPARMOR_ENFORCE;
1381 module_param_call(mode, param_set_mode, param_get_mode,
1382 &aa_g_profile_mode, S_IRUSR | S_IWUSR);
1384 /* whether policy verification hashing is enabled */
1385 bool aa_g_hash_policy = IS_ENABLED(CONFIG_SECURITY_APPARMOR_HASH_DEFAULT);
1386 #ifdef CONFIG_SECURITY_APPARMOR_HASH
1387 module_param_named(hash_policy, aa_g_hash_policy, aabool, S_IRUSR | S_IWUSR);
1390 /* whether policy exactly as loaded is retained for debug and checkpointing */
1391 bool aa_g_export_binary = IS_ENABLED(CONFIG_SECURITY_APPARMOR_EXPORT_BINARY);
1392 #ifdef CONFIG_SECURITY_APPARMOR_EXPORT_BINARY
1393 module_param_named(export_binary, aa_g_export_binary, aabool, 0600);
1396 /* policy loaddata compression level */
1397 int aa_g_rawdata_compression_level = AA_DEFAULT_CLEVEL;
1398 module_param_named(rawdata_compression_level, aa_g_rawdata_compression_level,
1399 aacompressionlevel, 0400);
1402 bool aa_g_debug = IS_ENABLED(CONFIG_SECURITY_APPARMOR_DEBUG_MESSAGES);
1403 module_param_named(debug, aa_g_debug, aabool, S_IRUSR | S_IWUSR);
1406 enum audit_mode aa_g_audit;
1407 module_param_call(audit, param_set_audit, param_get_audit,
1408 &aa_g_audit, S_IRUSR | S_IWUSR);
1410 /* Determines if audit header is included in audited messages. This
1411 * provides more context if the audit daemon is not running
1413 bool aa_g_audit_header = true;
1414 module_param_named(audit_header, aa_g_audit_header, aabool,
1417 /* lock out loading/removal of policy
1418 * TODO: add in at boot loading of policy, which is the only way to
1419 * load policy, if lock_policy is set
1421 bool aa_g_lock_policy;
1422 module_param_named(lock_policy, aa_g_lock_policy, aalockpolicy,
1425 /* Syscall logging mode */
1426 bool aa_g_logsyscall;
1427 module_param_named(logsyscall, aa_g_logsyscall, aabool, S_IRUSR | S_IWUSR);
1429 /* Maximum pathname length before accesses will start getting rejected */
1430 unsigned int aa_g_path_max = 2 * PATH_MAX;
1431 module_param_named(path_max, aa_g_path_max, aauint, S_IRUSR);
1433 /* Determines how paranoid loading of policy is and how much verification
1434 * on the loaded policy is done.
1435 * DEPRECATED: read only as strict checking of load is always done now
1436 * that none root users (user namespaces) can load policy.
1438 bool aa_g_paranoid_load = IS_ENABLED(CONFIG_SECURITY_APPARMOR_PARANOID_LOAD);
1439 module_param_named(paranoid_load, aa_g_paranoid_load, aabool, S_IRUGO);
1441 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp);
1442 static int param_set_aaintbool(const char *val, const struct kernel_param *kp);
1443 #define param_check_aaintbool param_check_int
1444 static const struct kernel_param_ops param_ops_aaintbool = {
1445 .set = param_set_aaintbool,
1446 .get = param_get_aaintbool
1448 /* Boot time disable flag */
1449 static int apparmor_enabled __ro_after_init = 1;
1450 module_param_named(enabled, apparmor_enabled, aaintbool, 0444);
1452 static int __init apparmor_enabled_setup(char *str)
1454 unsigned long enabled;
1455 int error = kstrtoul(str, 0, &enabled);
1457 apparmor_enabled = enabled ? 1 : 0;
1461 __setup("apparmor=", apparmor_enabled_setup);
1463 /* set global flag turning off the ability to load policy */
1464 static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp)
1466 if (!apparmor_enabled)
1468 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1470 return param_set_bool(val, kp);
1473 static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
1475 if (!apparmor_enabled)
1477 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1479 return param_get_bool(buffer, kp);
1482 static int param_set_aabool(const char *val, const struct kernel_param *kp)
1484 if (!apparmor_enabled)
1486 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1488 return param_set_bool(val, kp);
1491 static int param_get_aabool(char *buffer, const struct kernel_param *kp)
1493 if (!apparmor_enabled)
1495 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1497 return param_get_bool(buffer, kp);
1500 static int param_set_aauint(const char *val, const struct kernel_param *kp)
1504 if (!apparmor_enabled)
1506 /* file is ro but enforce 2nd line check */
1507 if (apparmor_initialized)
1510 error = param_set_uint(val, kp);
1511 aa_g_path_max = max_t(uint32_t, aa_g_path_max, sizeof(union aa_buffer));
1512 pr_info("AppArmor: buffer size set to %d bytes\n", aa_g_path_max);
1517 static int param_get_aauint(char *buffer, const struct kernel_param *kp)
1519 if (!apparmor_enabled)
1521 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1523 return param_get_uint(buffer, kp);
1526 /* Can only be set before AppArmor is initialized (i.e. on boot cmdline). */
1527 static int param_set_aaintbool(const char *val, const struct kernel_param *kp)
1529 struct kernel_param kp_local;
1533 if (apparmor_initialized)
1536 /* Create local copy, with arg pointing to bool type. */
1537 value = !!*((int *)kp->arg);
1538 memcpy(&kp_local, kp, sizeof(kp_local));
1539 kp_local.arg = &value;
1541 error = param_set_bool(val, &kp_local);
1543 *((int *)kp->arg) = *((bool *)kp_local.arg);
1548 * To avoid changing /sys/module/apparmor/parameters/enabled from Y/N to
1549 * 1/0, this converts the "int that is actually bool" back to bool for
1550 * display in the /sys filesystem, while keeping it "int" for the LSM
1553 static int param_get_aaintbool(char *buffer, const struct kernel_param *kp)
1555 struct kernel_param kp_local;
1558 /* Create local copy, with arg pointing to bool type. */
1559 value = !!*((int *)kp->arg);
1560 memcpy(&kp_local, kp, sizeof(kp_local));
1561 kp_local.arg = &value;
1563 return param_get_bool(buffer, &kp_local);
1566 static int param_set_aacompressionlevel(const char *val,
1567 const struct kernel_param *kp)
1571 if (!apparmor_enabled)
1573 if (apparmor_initialized)
1576 error = param_set_int(val, kp);
1578 aa_g_rawdata_compression_level = clamp(aa_g_rawdata_compression_level,
1579 AA_MIN_CLEVEL, AA_MAX_CLEVEL);
1580 pr_info("AppArmor: policy rawdata compression level set to %d\n",
1581 aa_g_rawdata_compression_level);
1586 static int param_get_aacompressionlevel(char *buffer,
1587 const struct kernel_param *kp)
1589 if (!apparmor_enabled)
1591 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1593 return param_get_int(buffer, kp);
1596 static int param_get_audit(char *buffer, const struct kernel_param *kp)
1598 if (!apparmor_enabled)
1600 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1602 return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
1605 static int param_set_audit(const char *val, const struct kernel_param *kp)
1609 if (!apparmor_enabled)
1613 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1616 i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
1624 static int param_get_mode(char *buffer, const struct kernel_param *kp)
1626 if (!apparmor_enabled)
1628 if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
1631 return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
1634 static int param_set_mode(const char *val, const struct kernel_param *kp)
1638 if (!apparmor_enabled)
1642 if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
1645 i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
1650 aa_g_profile_mode = i;
1654 char *aa_get_buffer(bool in_atomic)
1656 union aa_buffer *aa_buf;
1657 bool try_again = true;
1658 gfp_t flags = (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1661 spin_lock(&aa_buffers_lock);
1662 if (buffer_count > reserve_count ||
1663 (in_atomic && !list_empty(&aa_global_buffers))) {
1664 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1666 list_del(&aa_buf->list);
1668 spin_unlock(&aa_buffers_lock);
1669 return aa_buf->buffer;
1673 * out of reserve buffers and in atomic context so increase
1674 * how many buffers to keep in reserve
1679 spin_unlock(&aa_buffers_lock);
1683 aa_buf = kmalloc(aa_g_path_max, flags);
1689 pr_warn_once("AppArmor: Failed to allocate a memory buffer.\n");
1692 return aa_buf->buffer;
1695 void aa_put_buffer(char *buf)
1697 union aa_buffer *aa_buf;
1701 aa_buf = container_of(buf, union aa_buffer, buffer[0]);
1703 spin_lock(&aa_buffers_lock);
1704 list_add(&aa_buf->list, &aa_global_buffers);
1706 spin_unlock(&aa_buffers_lock);
1710 * AppArmor init functions
1714 * set_init_ctx - set a task context and profile on the first task.
1716 * TODO: allow setting an alternate profile than unconfined
1718 static int __init set_init_ctx(void)
1720 struct cred *cred = (__force struct cred *)current->real_cred;
1722 set_cred_label(cred, aa_get_label(ns_unconfined(root_ns)));
1727 static void destroy_buffers(void)
1729 union aa_buffer *aa_buf;
1731 spin_lock(&aa_buffers_lock);
1732 while (!list_empty(&aa_global_buffers)) {
1733 aa_buf = list_first_entry(&aa_global_buffers, union aa_buffer,
1735 list_del(&aa_buf->list);
1736 spin_unlock(&aa_buffers_lock);
1738 spin_lock(&aa_buffers_lock);
1740 spin_unlock(&aa_buffers_lock);
1743 static int __init alloc_buffers(void)
1745 union aa_buffer *aa_buf;
1749 * A function may require two buffers at once. Usually the buffers are
1750 * used for a short period of time and are shared. On UP kernel buffers
1751 * two should be enough, with more CPUs it is possible that more
1752 * buffers will be used simultaneously. The preallocated pool may grow.
1753 * This preallocation has also the side-effect that AppArmor will be
1754 * disabled early at boot if aa_g_path_max is extremly high.
1756 if (num_online_cpus() > 1)
1757 num = 4 + RESERVE_COUNT;
1759 num = 2 + RESERVE_COUNT;
1761 for (i = 0; i < num; i++) {
1763 aa_buf = kmalloc(aa_g_path_max, GFP_KERNEL |
1764 __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
1769 aa_put_buffer(aa_buf->buffer);
1774 #ifdef CONFIG_SYSCTL
1775 static int apparmor_dointvec(struct ctl_table *table, int write,
1776 void *buffer, size_t *lenp, loff_t *ppos)
1778 if (!aa_current_policy_admin_capable(NULL))
1780 if (!apparmor_enabled)
1783 return proc_dointvec(table, write, buffer, lenp, ppos);
1786 static struct ctl_table apparmor_sysctl_table[] = {
1788 .procname = "unprivileged_userns_apparmor_policy",
1789 .data = &unprivileged_userns_apparmor_policy,
1790 .maxlen = sizeof(int),
1792 .proc_handler = apparmor_dointvec,
1795 .procname = "apparmor_display_secid_mode",
1796 .data = &apparmor_display_secid_mode,
1797 .maxlen = sizeof(int),
1799 .proc_handler = apparmor_dointvec,
1805 static int __init apparmor_init_sysctl(void)
1807 return register_sysctl("kernel", apparmor_sysctl_table) ? 0 : -ENOMEM;
1810 static inline int apparmor_init_sysctl(void)
1814 #endif /* CONFIG_SYSCTL */
1816 #if defined(CONFIG_NETFILTER) && defined(CONFIG_NETWORK_SECMARK)
1817 static unsigned int apparmor_ip_postroute(void *priv,
1818 struct sk_buff *skb,
1819 const struct nf_hook_state *state)
1821 struct aa_sk_ctx *ctx;
1827 sk = skb_to_full_sk(skb);
1832 if (!apparmor_secmark_check(ctx->label, OP_SENDMSG, AA_MAY_SEND,
1836 return NF_DROP_ERR(-ECONNREFUSED);
1840 static const struct nf_hook_ops apparmor_nf_ops[] = {
1842 .hook = apparmor_ip_postroute,
1844 .hooknum = NF_INET_POST_ROUTING,
1845 .priority = NF_IP_PRI_SELINUX_FIRST,
1847 #if IS_ENABLED(CONFIG_IPV6)
1849 .hook = apparmor_ip_postroute,
1851 .hooknum = NF_INET_POST_ROUTING,
1852 .priority = NF_IP6_PRI_SELINUX_FIRST,
1857 static int __net_init apparmor_nf_register(struct net *net)
1859 return nf_register_net_hooks(net, apparmor_nf_ops,
1860 ARRAY_SIZE(apparmor_nf_ops));
1863 static void __net_exit apparmor_nf_unregister(struct net *net)
1865 nf_unregister_net_hooks(net, apparmor_nf_ops,
1866 ARRAY_SIZE(apparmor_nf_ops));
1869 static struct pernet_operations apparmor_net_ops = {
1870 .init = apparmor_nf_register,
1871 .exit = apparmor_nf_unregister,
1874 static int __init apparmor_nf_ip_init(void)
1878 if (!apparmor_enabled)
1881 err = register_pernet_subsys(&apparmor_net_ops);
1883 panic("Apparmor: register_pernet_subsys: error %d\n", err);
1887 __initcall(apparmor_nf_ip_init);
1890 static int __init apparmor_init(void)
1894 error = aa_setup_dfa_engine();
1896 AA_ERROR("Unable to setup dfa engine\n");
1900 error = aa_alloc_root_ns();
1902 AA_ERROR("Unable to allocate default profile namespace\n");
1906 error = apparmor_init_sysctl();
1908 AA_ERROR("Unable to register sysctls\n");
1913 error = alloc_buffers();
1915 AA_ERROR("Unable to allocate work buffers\n");
1919 error = set_init_ctx();
1921 AA_ERROR("Failed to set context on init task\n");
1925 security_add_hooks(apparmor_hooks, ARRAY_SIZE(apparmor_hooks),
1928 /* Report that AppArmor successfully initialized */
1929 apparmor_initialized = 1;
1930 if (aa_g_profile_mode == APPARMOR_COMPLAIN)
1931 aa_info_message("AppArmor initialized: complain mode enabled");
1932 else if (aa_g_profile_mode == APPARMOR_KILL)
1933 aa_info_message("AppArmor initialized: kill mode enabled");
1935 aa_info_message("AppArmor initialized");
1943 aa_teardown_dfa_engine();
1945 apparmor_enabled = false;
1949 DEFINE_LSM(apparmor) = {
1951 .flags = LSM_FLAG_LEGACY_MAJOR | LSM_FLAG_EXCLUSIVE,
1952 .enabled = &apparmor_enabled,
1953 .blobs = &apparmor_blob_sizes,
1954 .init = apparmor_init,