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1664 lines
72 KiB
1664 lines
72 KiB
/* |
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* Linux Security Module interfaces |
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* |
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* Copyright (C) 2001 WireX Communications, Inc <[email protected]> |
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* Copyright (C) 2001 Greg Kroah-Hartman <[email protected]> |
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* Copyright (C) 2001 Networks Associates Technology, Inc <[email protected]> |
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* Copyright (C) 2001 James Morris <[email protected]> |
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* Copyright (C) 2001 Silicon Graphics, Inc. (Trust Technology Group) |
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* Copyright (C) 2015 Intel Corporation. |
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* Copyright (C) 2015 Casey Schaufler <[email protected]> |
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* Copyright (C) 2016 Mellanox Techonologies |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* Due to this file being licensed under the GPL there is controversy over |
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* whether this permits you to write a module that #includes this file |
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* without placing your module under the GPL. Please consult a lawyer for |
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* advice before doing this. |
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* |
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*/ |
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#ifndef __LINUX_LSM_HOOKS_H |
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#define __LINUX_LSM_HOOKS_H |
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#include <linux/security.h> |
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#include <linux/init.h> |
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#include <linux/rculist.h> |
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|
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/** |
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* union security_list_options - Linux Security Module hook function list |
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* |
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* Security hooks for program execution operations. |
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* |
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* @bprm_creds_for_exec: |
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* If the setup in prepare_exec_creds did not setup @bprm->cred->security |
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* properly for executing @bprm->file, update the LSM's portion of |
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* @bprm->cred->security to be what commit_creds needs to install for the |
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* new program. This hook may also optionally check permissions |
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* (e.g. for transitions between security domains). |
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* The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to |
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* request libc enable secure mode. |
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* @bprm contains the linux_binprm structure. |
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* Return 0 if the hook is successful and permission is granted. |
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* @bprm_creds_from_file: |
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* If @file is setpcap, suid, sgid or otherwise marked to change |
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* privilege upon exec, update @bprm->cred to reflect that change. |
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* This is called after finding the binary that will be executed. |
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* without an interpreter. This ensures that the credentials will not |
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* be derived from a script that the binary will need to reopen, which |
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* when reopend may end up being a completely different file. This |
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* hook may also optionally check permissions (e.g. for transitions |
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* between security domains). |
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* The hook must set @bprm->secureexec to 1 if AT_SECURE should be set to |
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* request libc enable secure mode. |
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* The hook must add to @bprm->per_clear any personality flags that |
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* should be cleared from current->personality. |
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* @bprm contains the linux_binprm structure. |
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* Return 0 if the hook is successful and permission is granted. |
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* @bprm_check_security: |
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* This hook mediates the point when a search for a binary handler will |
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* begin. It allows a check against the @bprm->cred->security value |
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* which was set in the preceding creds_for_exec call. The argv list and |
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* envp list are reliably available in @bprm. This hook may be called |
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* multiple times during a single execve. |
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* @bprm contains the linux_binprm structure. |
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* Return 0 if the hook is successful and permission is granted. |
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* @bprm_committing_creds: |
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* Prepare to install the new security attributes of a process being |
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* transformed by an execve operation, based on the old credentials |
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* pointed to by @current->cred and the information set in @bprm->cred by |
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* the bprm_creds_for_exec hook. @bprm points to the linux_binprm |
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* structure. This hook is a good place to perform state changes on the |
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* process such as closing open file descriptors to which access will no |
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* longer be granted when the attributes are changed. This is called |
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* immediately before commit_creds(). |
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* @bprm_committed_creds: |
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* Tidy up after the installation of the new security attributes of a |
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* process being transformed by an execve operation. The new credentials |
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* have, by this point, been set to @current->cred. @bprm points to the |
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* linux_binprm structure. This hook is a good place to perform state |
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* changes on the process such as clearing out non-inheritable signal |
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* state. This is called immediately after commit_creds(). |
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* |
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* Security hooks for mount using fs_context. |
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* [See also Documentation/filesystems/mount_api.rst] |
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* |
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* @fs_context_dup: |
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* Allocate and attach a security structure to sc->security. This pointer |
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* is initialised to NULL by the caller. |
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* @fc indicates the new filesystem context. |
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* @src_fc indicates the original filesystem context. |
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* @fs_context_parse_param: |
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* Userspace provided a parameter to configure a superblock. The LSM may |
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* reject it with an error and may use it for itself, in which case it |
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* should return 0; otherwise it should return -ENOPARAM to pass it on to |
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* the filesystem. |
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* @fc indicates the filesystem context. |
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* @param The parameter |
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* |
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* Security hooks for filesystem operations. |
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* |
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* @sb_alloc_security: |
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* Allocate and attach a security structure to the sb->s_security field. |
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* The s_security field is initialized to NULL when the structure is |
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* allocated. |
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* @sb contains the super_block structure to be modified. |
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* Return 0 if operation was successful. |
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* @sb_free_security: |
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* Deallocate and clear the sb->s_security field. |
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* @sb contains the super_block structure to be modified. |
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* @sb_free_mnt_opts: |
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* Free memory associated with @mnt_ops. |
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* @sb_eat_lsm_opts: |
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* Eat (scan @orig options) and save them in @mnt_opts. |
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* @sb_statfs: |
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* Check permission before obtaining filesystem statistics for the @mnt |
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* mountpoint. |
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* @dentry is a handle on the superblock for the filesystem. |
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* Return 0 if permission is granted. |
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* @sb_mount: |
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* Check permission before an object specified by @dev_name is mounted on |
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* the mount point named by @nd. For an ordinary mount, @dev_name |
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* identifies a device if the file system type requires a device. For a |
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* remount (@flags & MS_REMOUNT), @dev_name is irrelevant. For a |
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* loopback/bind mount (@flags & MS_BIND), @dev_name identifies the |
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* pathname of the object being mounted. |
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* @dev_name contains the name for object being mounted. |
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* @path contains the path for mount point object. |
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* @type contains the filesystem type. |
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* @flags contains the mount flags. |
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* @data contains the filesystem-specific data. |
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* Return 0 if permission is granted. |
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* @sb_copy_data: |
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* Allow mount option data to be copied prior to parsing by the filesystem, |
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* so that the security module can extract security-specific mount |
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* options cleanly (a filesystem may modify the data e.g. with strsep()). |
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* This also allows the original mount data to be stripped of security- |
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* specific options to avoid having to make filesystems aware of them. |
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* @orig the original mount data copied from userspace. |
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* @copy copied data which will be passed to the security module. |
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* Returns 0 if the copy was successful. |
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* @sb_remount: |
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* Extracts security system specific mount options and verifies no changes |
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* are being made to those options. |
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* @sb superblock being remounted |
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* @data contains the filesystem-specific data. |
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* Return 0 if permission is granted. |
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* @sb_kern_mount: |
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* Mount this @sb if allowed by permissions. |
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* @sb_show_options: |
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* Show (print on @m) mount options for this @sb. |
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* @sb_umount: |
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* Check permission before the @mnt file system is unmounted. |
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* @mnt contains the mounted file system. |
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* @flags contains the unmount flags, e.g. MNT_FORCE. |
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* Return 0 if permission is granted. |
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* @sb_pivotroot: |
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* Check permission before pivoting the root filesystem. |
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* @old_path contains the path for the new location of the |
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* current root (put_old). |
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* @new_path contains the path for the new root (new_root). |
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* Return 0 if permission is granted. |
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* @sb_set_mnt_opts: |
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* Set the security relevant mount options used for a superblock |
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* @sb the superblock to set security mount options for |
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* @opts binary data structure containing all lsm mount data |
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* @sb_clone_mnt_opts: |
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* Copy all security options from a given superblock to another |
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* @oldsb old superblock which contain information to clone |
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* @newsb new superblock which needs filled in |
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* @sb_add_mnt_opt: |
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* Add one mount @option to @mnt_opts. |
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* @sb_parse_opts_str: |
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* Parse a string of security data filling in the opts structure |
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* @options string containing all mount options known by the LSM |
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* @opts binary data structure usable by the LSM |
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* @move_mount: |
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* Check permission before a mount is moved. |
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* @from_path indicates the mount that is going to be moved. |
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* @to_path indicates the mountpoint that will be mounted upon. |
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* @dentry_init_security: |
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* Compute a context for a dentry as the inode is not yet available |
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* since NFSv4 has no label backed by an EA anyway. |
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* @dentry dentry to use in calculating the context. |
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* @mode mode used to determine resource type. |
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* @name name of the last path component used to create file |
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* @ctx pointer to place the pointer to the resulting context in. |
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* @ctxlen point to place the length of the resulting context. |
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* @dentry_create_files_as: |
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* Compute a context for a dentry as the inode is not yet available |
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* and set that context in passed in creds so that new files are |
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* created using that context. Context is calculated using the |
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* passed in creds and not the creds of the caller. |
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* @dentry dentry to use in calculating the context. |
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* @mode mode used to determine resource type. |
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* @name name of the last path component used to create file |
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* @old creds which should be used for context calculation |
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* @new creds to modify |
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* |
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* |
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* Security hooks for inode operations. |
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* |
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* @inode_alloc_security: |
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* Allocate and attach a security structure to @inode->i_security. The |
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* i_security field is initialized to NULL when the inode structure is |
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* allocated. |
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* @inode contains the inode structure. |
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* Return 0 if operation was successful. |
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* @inode_free_security: |
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* @inode contains the inode structure. |
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* Deallocate the inode security structure and set @inode->i_security to |
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* NULL. |
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* @inode_init_security: |
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* Obtain the security attribute name suffix and value to set on a newly |
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* created inode and set up the incore security field for the new inode. |
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* This hook is called by the fs code as part of the inode creation |
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* transaction and provides for atomic labeling of the inode, unlike |
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* the post_create/mkdir/... hooks called by the VFS. The hook function |
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* is expected to allocate the name and value via kmalloc, with the caller |
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* being responsible for calling kfree after using them. |
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* If the security module does not use security attributes or does |
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* not wish to put a security attribute on this particular inode, |
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* then it should return -EOPNOTSUPP to skip this processing. |
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* @inode contains the inode structure of the newly created inode. |
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* @dir contains the inode structure of the parent directory. |
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* @qstr contains the last path component of the new object |
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* @name will be set to the allocated name suffix (e.g. selinux). |
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* @value will be set to the allocated attribute value. |
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* @len will be set to the length of the value. |
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* Returns 0 if @name and @value have been successfully set, |
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* -EOPNOTSUPP if no security attribute is needed, or |
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* -ENOMEM on memory allocation failure. |
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* @inode_init_security_anon: |
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* Set up the incore security field for the new anonymous inode |
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* and return whether the inode creation is permitted by the security |
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* module or not. |
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* @inode contains the inode structure |
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* @name name of the anonymous inode class |
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* @context_inode optional related inode |
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* Returns 0 on success, -EACCES if the security module denies the |
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* creation of this inode, or another -errno upon other errors. |
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* @inode_create: |
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* Check permission to create a regular file. |
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* @dir contains inode structure of the parent of the new file. |
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* @dentry contains the dentry structure for the file to be created. |
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* @mode contains the file mode of the file to be created. |
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* Return 0 if permission is granted. |
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* @inode_link: |
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* Check permission before creating a new hard link to a file. |
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* @old_dentry contains the dentry structure for an existing |
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* link to the file. |
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* @dir contains the inode structure of the parent directory |
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* of the new link. |
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* @new_dentry contains the dentry structure for the new link. |
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* Return 0 if permission is granted. |
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* @path_link: |
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* Check permission before creating a new hard link to a file. |
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* @old_dentry contains the dentry structure for an existing link |
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* to the file. |
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* @new_dir contains the path structure of the parent directory of |
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* the new link. |
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* @new_dentry contains the dentry structure for the new link. |
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* Return 0 if permission is granted. |
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* @inode_unlink: |
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* Check the permission to remove a hard link to a file. |
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* @dir contains the inode structure of parent directory of the file. |
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* @dentry contains the dentry structure for file to be unlinked. |
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* Return 0 if permission is granted. |
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* @path_unlink: |
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* Check the permission to remove a hard link to a file. |
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* @dir contains the path structure of parent directory of the file. |
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* @dentry contains the dentry structure for file to be unlinked. |
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* Return 0 if permission is granted. |
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* @inode_symlink: |
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* Check the permission to create a symbolic link to a file. |
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* @dir contains the inode structure of parent directory of |
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* the symbolic link. |
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* @dentry contains the dentry structure of the symbolic link. |
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* @old_name contains the pathname of file. |
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* Return 0 if permission is granted. |
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* @path_symlink: |
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* Check the permission to create a symbolic link to a file. |
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* @dir contains the path structure of parent directory of |
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* the symbolic link. |
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* @dentry contains the dentry structure of the symbolic link. |
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* @old_name contains the pathname of file. |
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* Return 0 if permission is granted. |
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* @inode_mkdir: |
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* Check permissions to create a new directory in the existing directory |
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* associated with inode structure @dir. |
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* @dir contains the inode structure of parent of the directory |
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* to be created. |
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* @dentry contains the dentry structure of new directory. |
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* @mode contains the mode of new directory. |
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* Return 0 if permission is granted. |
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* @path_mkdir: |
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* Check permissions to create a new directory in the existing directory |
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* associated with path structure @path. |
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* @dir contains the path structure of parent of the directory |
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* to be created. |
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* @dentry contains the dentry structure of new directory. |
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* @mode contains the mode of new directory. |
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* Return 0 if permission is granted. |
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* @inode_rmdir: |
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* Check the permission to remove a directory. |
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* @dir contains the inode structure of parent of the directory |
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* to be removed. |
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* @dentry contains the dentry structure of directory to be removed. |
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* Return 0 if permission is granted. |
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* @path_rmdir: |
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* Check the permission to remove a directory. |
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* @dir contains the path structure of parent of the directory to be |
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* removed. |
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* @dentry contains the dentry structure of directory to be removed. |
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* Return 0 if permission is granted. |
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* @inode_mknod: |
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* Check permissions when creating a special file (or a socket or a fifo |
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* file created via the mknod system call). Note that if mknod operation |
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* is being done for a regular file, then the create hook will be called |
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* and not this hook. |
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* @dir contains the inode structure of parent of the new file. |
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* @dentry contains the dentry structure of the new file. |
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* @mode contains the mode of the new file. |
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* @dev contains the device number. |
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* Return 0 if permission is granted. |
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* @path_mknod: |
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* Check permissions when creating a file. Note that this hook is called |
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* even if mknod operation is being done for a regular file. |
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* @dir contains the path structure of parent of the new file. |
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* @dentry contains the dentry structure of the new file. |
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* @mode contains the mode of the new file. |
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* @dev contains the undecoded device number. Use new_decode_dev() to get |
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* the decoded device number. |
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* Return 0 if permission is granted. |
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* @inode_rename: |
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* Check for permission to rename a file or directory. |
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* @old_dir contains the inode structure for parent of the old link. |
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* @old_dentry contains the dentry structure of the old link. |
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* @new_dir contains the inode structure for parent of the new link. |
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* @new_dentry contains the dentry structure of the new link. |
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* Return 0 if permission is granted. |
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* @path_rename: |
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* Check for permission to rename a file or directory. |
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* @old_dir contains the path structure for parent of the old link. |
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* @old_dentry contains the dentry structure of the old link. |
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* @new_dir contains the path structure for parent of the new link. |
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* @new_dentry contains the dentry structure of the new link. |
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* Return 0 if permission is granted. |
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* @path_chmod: |
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* Check for permission to change a mode of the file @path. The new |
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* mode is specified in @mode. |
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* @path contains the path structure of the file to change the mode. |
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* @mode contains the new DAC's permission, which is a bitmask of |
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* constants from <include/uapi/linux/stat.h> |
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* Return 0 if permission is granted. |
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* @path_chown: |
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* Check for permission to change owner/group of a file or directory. |
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* @path contains the path structure. |
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* @uid contains new owner's ID. |
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* @gid contains new group's ID. |
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* Return 0 if permission is granted. |
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* @path_chroot: |
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* Check for permission to change root directory. |
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* @path contains the path structure. |
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* Return 0 if permission is granted. |
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* @path_notify: |
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* Check permissions before setting a watch on events as defined by @mask, |
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* on an object at @path, whose type is defined by @obj_type. |
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* @inode_readlink: |
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* Check the permission to read the symbolic link. |
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* @dentry contains the dentry structure for the file link. |
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* Return 0 if permission is granted. |
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* @inode_follow_link: |
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* Check permission to follow a symbolic link when looking up a pathname. |
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* @dentry contains the dentry structure for the link. |
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* @inode contains the inode, which itself is not stable in RCU-walk |
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* @rcu indicates whether we are in RCU-walk mode. |
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* Return 0 if permission is granted. |
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* @inode_permission: |
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* Check permission before accessing an inode. This hook is called by the |
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* existing Linux permission function, so a security module can use it to |
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* provide additional checking for existing Linux permission checks. |
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* Notice that this hook is called when a file is opened (as well as many |
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* other operations), whereas the file_security_ops permission hook is |
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* called when the actual read/write operations are performed. |
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* @inode contains the inode structure to check. |
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* @mask contains the permission mask. |
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* Return 0 if permission is granted. |
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* @inode_setattr: |
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* Check permission before setting file attributes. Note that the kernel |
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* call to notify_change is performed from several locations, whenever |
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* file attributes change (such as when a file is truncated, chown/chmod |
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* operations, transferring disk quotas, etc). |
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* @dentry contains the dentry structure for the file. |
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* @attr is the iattr structure containing the new file attributes. |
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* Return 0 if permission is granted. |
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* @path_truncate: |
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* Check permission before truncating a file. |
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* @path contains the path structure for the file. |
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* Return 0 if permission is granted. |
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* @inode_getattr: |
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* Check permission before obtaining file attributes. |
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* @path contains the path structure for the file. |
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* Return 0 if permission is granted. |
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* @inode_setxattr: |
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* Check permission before setting the extended attributes |
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* @value identified by @name for @dentry. |
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* Return 0 if permission is granted. |
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* @inode_post_setxattr: |
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* Update inode security field after successful setxattr operation. |
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* @value identified by @name for @dentry. |
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* @inode_getxattr: |
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* Check permission before obtaining the extended attributes |
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* identified by @name for @dentry. |
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* Return 0 if permission is granted. |
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* @inode_listxattr: |
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* Check permission before obtaining the list of extended attribute |
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* names for @dentry. |
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* Return 0 if permission is granted. |
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* @inode_removexattr: |
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* Check permission before removing the extended attribute |
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* identified by @name for @dentry. |
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* Return 0 if permission is granted. |
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* @inode_getsecurity: |
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* Retrieve a copy of the extended attribute representation of the |
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* security label associated with @name for @inode via @buffer. Note that |
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* @name is the remainder of the attribute name after the security prefix |
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* has been removed. @alloc is used to specify of the call should return a |
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* value via the buffer or just the value length Return size of buffer on |
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* success. |
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* @inode_setsecurity: |
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* Set the security label associated with @name for @inode from the |
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* extended attribute value @value. @size indicates the size of the |
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* @value in bytes. @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. |
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* Note that @name is the remainder of the attribute name after the |
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* security. prefix has been removed. |
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* Return 0 on success. |
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* @inode_listsecurity: |
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* Copy the extended attribute names for the security labels |
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* associated with @inode into @buffer. The maximum size of @buffer |
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* is specified by @buffer_size. @buffer may be NULL to request |
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* the size of the buffer required. |
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* Returns number of bytes used/required on success. |
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* @inode_need_killpriv: |
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* Called when an inode has been changed. |
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* @dentry is the dentry being changed. |
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* Return <0 on error to abort the inode change operation. |
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* Return 0 if inode_killpriv does not need to be called. |
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* Return >0 if inode_killpriv does need to be called. |
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* @inode_killpriv: |
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* The setuid bit is being removed. Remove similar security labels. |
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* Called with the dentry->d_inode->i_mutex held. |
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* @mnt_userns: user namespace of the mount |
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* @dentry is the dentry being changed. |
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* Return 0 on success. If error is returned, then the operation |
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* causing setuid bit removal is failed. |
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* @inode_getsecid: |
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* Get the secid associated with the node. |
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* @inode contains a pointer to the inode. |
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* @secid contains a pointer to the location where result will be saved. |
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* In case of failure, @secid will be set to zero. |
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* @inode_copy_up: |
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* A file is about to be copied up from lower layer to upper layer of |
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* overlay filesystem. Security module can prepare a set of new creds |
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* and modify as need be and return new creds. Caller will switch to |
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* new creds temporarily to create new file and release newly allocated |
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* creds. |
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* @src indicates the union dentry of file that is being copied up. |
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* @new pointer to pointer to return newly allocated creds. |
|
* Returns 0 on success or a negative error code on error. |
|
* @inode_copy_up_xattr: |
|
* Filter the xattrs being copied up when a unioned file is copied |
|
* up from a lower layer to the union/overlay layer. |
|
* @name indicates the name of the xattr. |
|
* Returns 0 to accept the xattr, 1 to discard the xattr, -EOPNOTSUPP if |
|
* security module does not know about attribute or a negative error code |
|
* to abort the copy up. Note that the caller is responsible for reading |
|
* and writing the xattrs as this hook is merely a filter. |
|
* @d_instantiate: |
|
* Fill in @inode security information for a @dentry if allowed. |
|
* @getprocattr: |
|
* Read attribute @name for process @p and store it into @value if allowed. |
|
* @setprocattr: |
|
* Write (set) attribute @name to @value, size @size if allowed. |
|
* |
|
* Security hooks for kernfs node operations |
|
* |
|
* @kernfs_init_security: |
|
* Initialize the security context of a newly created kernfs node based |
|
* on its own and its parent's attributes. |
|
* |
|
* @kn_dir the parent kernfs node |
|
* @kn the new child kernfs node |
|
* |
|
* Security hooks for file operations |
|
* |
|
* @file_permission: |
|
* Check file permissions before accessing an open file. This hook is |
|
* called by various operations that read or write files. A security |
|
* module can use this hook to perform additional checking on these |
|
* operations, e.g. to revalidate permissions on use to support privilege |
|
* bracketing or policy changes. Notice that this hook is used when the |
|
* actual read/write operations are performed, whereas the |
|
* inode_security_ops hook is called when a file is opened (as well as |
|
* many other operations). |
|
* Caveat: Although this hook can be used to revalidate permissions for |
|
* various system call operations that read or write files, it does not |
|
* address the revalidation of permissions for memory-mapped files. |
|
* Security modules must handle this separately if they need such |
|
* revalidation. |
|
* @file contains the file structure being accessed. |
|
* @mask contains the requested permissions. |
|
* Return 0 if permission is granted. |
|
* @file_alloc_security: |
|
* Allocate and attach a security structure to the file->f_security field. |
|
* The security field is initialized to NULL when the structure is first |
|
* created. |
|
* @file contains the file structure to secure. |
|
* Return 0 if the hook is successful and permission is granted. |
|
* @file_free_security: |
|
* Deallocate and free any security structures stored in file->f_security. |
|
* @file contains the file structure being modified. |
|
* @file_ioctl: |
|
* @file contains the file structure. |
|
* @cmd contains the operation to perform. |
|
* @arg contains the operational arguments. |
|
* Check permission for an ioctl operation on @file. Note that @arg |
|
* sometimes represents a user space pointer; in other cases, it may be a |
|
* simple integer value. When @arg represents a user space pointer, it |
|
* should never be used by the security module. |
|
* Return 0 if permission is granted. |
|
* @mmap_addr : |
|
* Check permissions for a mmap operation at @addr. |
|
* @addr contains virtual address that will be used for the operation. |
|
* Return 0 if permission is granted. |
|
* @mmap_file : |
|
* Check permissions for a mmap operation. The @file may be NULL, e.g. |
|
* if mapping anonymous memory. |
|
* @file contains the file structure for file to map (may be NULL). |
|
* @reqprot contains the protection requested by the application. |
|
* @prot contains the protection that will be applied by the kernel. |
|
* @flags contains the operational flags. |
|
* Return 0 if permission is granted. |
|
* @file_mprotect: |
|
* Check permissions before changing memory access permissions. |
|
* @vma contains the memory region to modify. |
|
* @reqprot contains the protection requested by the application. |
|
* @prot contains the protection that will be applied by the kernel. |
|
* Return 0 if permission is granted. |
|
* @file_lock: |
|
* Check permission before performing file locking operations. |
|
* Note the hook mediates both flock and fcntl style locks. |
|
* @file contains the file structure. |
|
* @cmd contains the posix-translated lock operation to perform |
|
* (e.g. F_RDLCK, F_WRLCK). |
|
* Return 0 if permission is granted. |
|
* @file_fcntl: |
|
* Check permission before allowing the file operation specified by @cmd |
|
* from being performed on the file @file. Note that @arg sometimes |
|
* represents a user space pointer; in other cases, it may be a simple |
|
* integer value. When @arg represents a user space pointer, it should |
|
* never be used by the security module. |
|
* @file contains the file structure. |
|
* @cmd contains the operation to be performed. |
|
* @arg contains the operational arguments. |
|
* Return 0 if permission is granted. |
|
* @file_set_fowner: |
|
* Save owner security information (typically from current->security) in |
|
* file->f_security for later use by the send_sigiotask hook. |
|
* @file contains the file structure to update. |
|
* Return 0 on success. |
|
* @file_send_sigiotask: |
|
* Check permission for the file owner @fown to send SIGIO or SIGURG to the |
|
* process @tsk. Note that this hook is sometimes called from interrupt. |
|
* Note that the fown_struct, @fown, is never outside the context of a |
|
* struct file, so the file structure (and associated security information) |
|
* can always be obtained: container_of(fown, struct file, f_owner) |
|
* @tsk contains the structure of task receiving signal. |
|
* @fown contains the file owner information. |
|
* @sig is the signal that will be sent. When 0, kernel sends SIGIO. |
|
* Return 0 if permission is granted. |
|
* @file_receive: |
|
* This hook allows security modules to control the ability of a process |
|
* to receive an open file descriptor via socket IPC. |
|
* @file contains the file structure being received. |
|
* Return 0 if permission is granted. |
|
* @file_open: |
|
* Save open-time permission checking state for later use upon |
|
* file_permission, and recheck access if anything has changed |
|
* since inode_permission. |
|
* |
|
* Security hooks for task operations. |
|
* |
|
* @task_alloc: |
|
* @task task being allocated. |
|
* @clone_flags contains the flags indicating what should be shared. |
|
* Handle allocation of task-related resources. |
|
* Returns a zero on success, negative values on failure. |
|
* @task_free: |
|
* @task task about to be freed. |
|
* Handle release of task-related resources. (Note that this can be called |
|
* from interrupt context.) |
|
* @cred_alloc_blank: |
|
* @cred points to the credentials. |
|
* @gfp indicates the atomicity of any memory allocations. |
|
* Only allocate sufficient memory and attach to @cred such that |
|
* cred_transfer() will not get ENOMEM. |
|
* @cred_free: |
|
* @cred points to the credentials. |
|
* Deallocate and clear the cred->security field in a set of credentials. |
|
* @cred_prepare: |
|
* @new points to the new credentials. |
|
* @old points to the original credentials. |
|
* @gfp indicates the atomicity of any memory allocations. |
|
* Prepare a new set of credentials by copying the data from the old set. |
|
* @cred_transfer: |
|
* @new points to the new credentials. |
|
* @old points to the original credentials. |
|
* Transfer data from original creds to new creds |
|
* @cred_getsecid: |
|
* Retrieve the security identifier of the cred structure @c |
|
* @c contains the credentials, secid will be placed into @secid. |
|
* In case of failure, @secid will be set to zero. |
|
* @kernel_act_as: |
|
* Set the credentials for a kernel service to act as (subjective context). |
|
* @new points to the credentials to be modified. |
|
* @secid specifies the security ID to be set |
|
* The current task must be the one that nominated @secid. |
|
* Return 0 if successful. |
|
* @kernel_create_files_as: |
|
* Set the file creation context in a set of credentials to be the same as |
|
* the objective context of the specified inode. |
|
* @new points to the credentials to be modified. |
|
* @inode points to the inode to use as a reference. |
|
* The current task must be the one that nominated @inode. |
|
* Return 0 if successful. |
|
* @kernel_module_request: |
|
* Ability to trigger the kernel to automatically upcall to userspace for |
|
* userspace to load a kernel module with the given name. |
|
* @kmod_name name of the module requested by the kernel |
|
* Return 0 if successful. |
|
* @kernel_load_data: |
|
* Load data provided by userspace. |
|
* @id kernel load data identifier |
|
* @contents if a subsequent @kernel_post_load_data will be called. |
|
* Return 0 if permission is granted. |
|
* @kernel_post_load_data: |
|
* Load data provided by a non-file source (usually userspace buffer). |
|
* @buf pointer to buffer containing the data contents. |
|
* @size length of the data contents. |
|
* @id kernel load data identifier |
|
* @description a text description of what was loaded, @id-specific |
|
* Return 0 if permission is granted. |
|
* This must be paired with a prior @kernel_load_data call that had |
|
* @contents set to true. |
|
* @kernel_read_file: |
|
* Read a file specified by userspace. |
|
* @file contains the file structure pointing to the file being read |
|
* by the kernel. |
|
* @id kernel read file identifier |
|
* @contents if a subsequent @kernel_post_read_file will be called. |
|
* Return 0 if permission is granted. |
|
* @kernel_post_read_file: |
|
* Read a file specified by userspace. |
|
* @file contains the file structure pointing to the file being read |
|
* by the kernel. |
|
* @buf pointer to buffer containing the file contents. |
|
* @size length of the file contents. |
|
* @id kernel read file identifier |
|
* This must be paired with a prior @kernel_read_file call that had |
|
* @contents set to true. |
|
* Return 0 if permission is granted. |
|
* @task_fix_setuid: |
|
* Update the module's state after setting one or more of the user |
|
* identity attributes of the current process. The @flags parameter |
|
* indicates which of the set*uid system calls invoked this hook. If |
|
* @new is the set of credentials that will be installed. Modifications |
|
* should be made to this rather than to @current->cred. |
|
* @old is the set of credentials that are being replaces |
|
* @flags contains one of the LSM_SETID_* values. |
|
* Return 0 on success. |
|
* @task_fix_setgid: |
|
* Update the module's state after setting one or more of the group |
|
* identity attributes of the current process. The @flags parameter |
|
* indicates which of the set*gid system calls invoked this hook. |
|
* @new is the set of credentials that will be installed. Modifications |
|
* should be made to this rather than to @current->cred. |
|
* @old is the set of credentials that are being replaced. |
|
* @flags contains one of the LSM_SETID_* values. |
|
* Return 0 on success. |
|
* @task_setpgid: |
|
* Check permission before setting the process group identifier of the |
|
* process @p to @pgid. |
|
* @p contains the task_struct for process being modified. |
|
* @pgid contains the new pgid. |
|
* Return 0 if permission is granted. |
|
* @task_getpgid: |
|
* Check permission before getting the process group identifier of the |
|
* process @p. |
|
* @p contains the task_struct for the process. |
|
* Return 0 if permission is granted. |
|
* @task_getsid: |
|
* Check permission before getting the session identifier of the process |
|
* @p. |
|
* @p contains the task_struct for the process. |
|
* Return 0 if permission is granted. |
|
* @task_getsecid: |
|
* Retrieve the security identifier of the process @p. |
|
* @p contains the task_struct for the process and place is into @secid. |
|
* In case of failure, @secid will be set to zero. |
|
* |
|
* @task_setnice: |
|
* Check permission before setting the nice value of @p to @nice. |
|
* @p contains the task_struct of process. |
|
* @nice contains the new nice value. |
|
* Return 0 if permission is granted. |
|
* @task_setioprio: |
|
* Check permission before setting the ioprio value of @p to @ioprio. |
|
* @p contains the task_struct of process. |
|
* @ioprio contains the new ioprio value |
|
* Return 0 if permission is granted. |
|
* @task_getioprio: |
|
* Check permission before getting the ioprio value of @p. |
|
* @p contains the task_struct of process. |
|
* Return 0 if permission is granted. |
|
* @task_prlimit: |
|
* Check permission before getting and/or setting the resource limits of |
|
* another task. |
|
* @cred points to the cred structure for the current task. |
|
* @tcred points to the cred structure for the target task. |
|
* @flags contains the LSM_PRLIMIT_* flag bits indicating whether the |
|
* resource limits are being read, modified, or both. |
|
* Return 0 if permission is granted. |
|
* @task_setrlimit: |
|
* Check permission before setting the resource limits of process @p |
|
* for @resource to @new_rlim. The old resource limit values can |
|
* be examined by dereferencing (p->signal->rlim + resource). |
|
* @p points to the task_struct for the target task's group leader. |
|
* @resource contains the resource whose limit is being set. |
|
* @new_rlim contains the new limits for @resource. |
|
* Return 0 if permission is granted. |
|
* @task_setscheduler: |
|
* Check permission before setting scheduling policy and/or parameters of |
|
* process @p. |
|
* @p contains the task_struct for process. |
|
* Return 0 if permission is granted. |
|
* @task_getscheduler: |
|
* Check permission before obtaining scheduling information for process |
|
* @p. |
|
* @p contains the task_struct for process. |
|
* Return 0 if permission is granted. |
|
* @task_movememory: |
|
* Check permission before moving memory owned by process @p. |
|
* @p contains the task_struct for process. |
|
* Return 0 if permission is granted. |
|
* @task_kill: |
|
* Check permission before sending signal @sig to @p. @info can be NULL, |
|
* the constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or |
|
* SI_FROMKERNEL(info) is true, then the signal should be viewed as coming |
|
* from the kernel and should typically be permitted. |
|
* SIGIO signals are handled separately by the send_sigiotask hook in |
|
* file_security_ops. |
|
* @p contains the task_struct for process. |
|
* @info contains the signal information. |
|
* @sig contains the signal value. |
|
* @cred contains the cred of the process where the signal originated, or |
|
* NULL if the current task is the originator. |
|
* Return 0 if permission is granted. |
|
* @task_prctl: |
|
* Check permission before performing a process control operation on the |
|
* current process. |
|
* @option contains the operation. |
|
* @arg2 contains a argument. |
|
* @arg3 contains a argument. |
|
* @arg4 contains a argument. |
|
* @arg5 contains a argument. |
|
* Return -ENOSYS if no-one wanted to handle this op, any other value to |
|
* cause prctl() to return immediately with that value. |
|
* @task_to_inode: |
|
* Set the security attributes for an inode based on an associated task's |
|
* security attributes, e.g. for /proc/pid inodes. |
|
* @p contains the task_struct for the task. |
|
* @inode contains the inode structure for the inode. |
|
* |
|
* Security hooks for Netlink messaging. |
|
* |
|
* @netlink_send: |
|
* Save security information for a netlink message so that permission |
|
* checking can be performed when the message is processed. The security |
|
* information can be saved using the eff_cap field of the |
|
* netlink_skb_parms structure. Also may be used to provide fine |
|
* grained control over message transmission. |
|
* @sk associated sock of task sending the message. |
|
* @skb contains the sk_buff structure for the netlink message. |
|
* Return 0 if the information was successfully saved and message |
|
* is allowed to be transmitted. |
|
* |
|
* Security hooks for Unix domain networking. |
|
* |
|
* @unix_stream_connect: |
|
* Check permissions before establishing a Unix domain stream connection |
|
* between @sock and @other. |
|
* @sock contains the sock structure. |
|
* @other contains the peer sock structure. |
|
* @newsk contains the new sock structure. |
|
* Return 0 if permission is granted. |
|
* @unix_may_send: |
|
* Check permissions before connecting or sending datagrams from @sock to |
|
* @other. |
|
* @sock contains the socket structure. |
|
* @other contains the peer socket structure. |
|
* Return 0 if permission is granted. |
|
* |
|
* The @unix_stream_connect and @unix_may_send hooks were necessary because |
|
* Linux provides an alternative to the conventional file name space for Unix |
|
* domain sockets. Whereas binding and connecting to sockets in the file name |
|
* space is mediated by the typical file permissions (and caught by the mknod |
|
* and permission hooks in inode_security_ops), binding and connecting to |
|
* sockets in the abstract name space is completely unmediated. Sufficient |
|
* control of Unix domain sockets in the abstract name space isn't possible |
|
* using only the socket layer hooks, since we need to know the actual target |
|
* socket, which is not looked up until we are inside the af_unix code. |
|
* |
|
* Security hooks for socket operations. |
|
* |
|
* @socket_create: |
|
* Check permissions prior to creating a new socket. |
|
* @family contains the requested protocol family. |
|
* @type contains the requested communications type. |
|
* @protocol contains the requested protocol. |
|
* @kern set to 1 if a kernel socket. |
|
* Return 0 if permission is granted. |
|
* @socket_post_create: |
|
* This hook allows a module to update or allocate a per-socket security |
|
* structure. Note that the security field was not added directly to the |
|
* socket structure, but rather, the socket security information is stored |
|
* in the associated inode. Typically, the inode alloc_security hook will |
|
* allocate and attach security information to |
|
* SOCK_INODE(sock)->i_security. This hook may be used to update the |
|
* SOCK_INODE(sock)->i_security field with additional information that |
|
* wasn't available when the inode was allocated. |
|
* @sock contains the newly created socket structure. |
|
* @family contains the requested protocol family. |
|
* @type contains the requested communications type. |
|
* @protocol contains the requested protocol. |
|
* @kern set to 1 if a kernel socket. |
|
* @socket_socketpair: |
|
* Check permissions before creating a fresh pair of sockets. |
|
* @socka contains the first socket structure. |
|
* @sockb contains the second socket structure. |
|
* Return 0 if permission is granted and the connection was established. |
|
* @socket_bind: |
|
* Check permission before socket protocol layer bind operation is |
|
* performed and the socket @sock is bound to the address specified in the |
|
* @address parameter. |
|
* @sock contains the socket structure. |
|
* @address contains the address to bind to. |
|
* @addrlen contains the length of address. |
|
* Return 0 if permission is granted. |
|
* @socket_connect: |
|
* Check permission before socket protocol layer connect operation |
|
* attempts to connect socket @sock to a remote address, @address. |
|
* @sock contains the socket structure. |
|
* @address contains the address of remote endpoint. |
|
* @addrlen contains the length of address. |
|
* Return 0 if permission is granted. |
|
* @socket_listen: |
|
* Check permission before socket protocol layer listen operation. |
|
* @sock contains the socket structure. |
|
* @backlog contains the maximum length for the pending connection queue. |
|
* Return 0 if permission is granted. |
|
* @socket_accept: |
|
* Check permission before accepting a new connection. Note that the new |
|
* socket, @newsock, has been created and some information copied to it, |
|
* but the accept operation has not actually been performed. |
|
* @sock contains the listening socket structure. |
|
* @newsock contains the newly created server socket for connection. |
|
* Return 0 if permission is granted. |
|
* @socket_sendmsg: |
|
* Check permission before transmitting a message to another socket. |
|
* @sock contains the socket structure. |
|
* @msg contains the message to be transmitted. |
|
* @size contains the size of message. |
|
* Return 0 if permission is granted. |
|
* @socket_recvmsg: |
|
* Check permission before receiving a message from a socket. |
|
* @sock contains the socket structure. |
|
* @msg contains the message structure. |
|
* @size contains the size of message structure. |
|
* @flags contains the operational flags. |
|
* Return 0 if permission is granted. |
|
* @socket_getsockname: |
|
* Check permission before the local address (name) of the socket object |
|
* @sock is retrieved. |
|
* @sock contains the socket structure. |
|
* Return 0 if permission is granted. |
|
* @socket_getpeername: |
|
* Check permission before the remote address (name) of a socket object |
|
* @sock is retrieved. |
|
* @sock contains the socket structure. |
|
* Return 0 if permission is granted. |
|
* @socket_getsockopt: |
|
* Check permissions before retrieving the options associated with socket |
|
* @sock. |
|
* @sock contains the socket structure. |
|
* @level contains the protocol level to retrieve option from. |
|
* @optname contains the name of option to retrieve. |
|
* Return 0 if permission is granted. |
|
* @socket_setsockopt: |
|
* Check permissions before setting the options associated with socket |
|
* @sock. |
|
* @sock contains the socket structure. |
|
* @level contains the protocol level to set options for. |
|
* @optname contains the name of the option to set. |
|
* Return 0 if permission is granted. |
|
* @socket_shutdown: |
|
* Checks permission before all or part of a connection on the socket |
|
* @sock is shut down. |
|
* @sock contains the socket structure. |
|
* @how contains the flag indicating how future sends and receives |
|
* are handled. |
|
* Return 0 if permission is granted. |
|
* @socket_sock_rcv_skb: |
|
* Check permissions on incoming network packets. This hook is distinct |
|
* from Netfilter's IP input hooks since it is the first time that the |
|
* incoming sk_buff @skb has been associated with a particular socket, @sk. |
|
* Must not sleep inside this hook because some callers hold spinlocks. |
|
* @sk contains the sock (not socket) associated with the incoming sk_buff. |
|
* @skb contains the incoming network data. |
|
* @socket_getpeersec_stream: |
|
* This hook allows the security module to provide peer socket security |
|
* state for unix or connected tcp sockets to userspace via getsockopt |
|
* SO_GETPEERSEC. For tcp sockets this can be meaningful if the |
|
* socket is associated with an ipsec SA. |
|
* @sock is the local socket. |
|
* @optval userspace memory where the security state is to be copied. |
|
* @optlen userspace int where the module should copy the actual length |
|
* of the security state. |
|
* @len as input is the maximum length to copy to userspace provided |
|
* by the caller. |
|
* Return 0 if all is well, otherwise, typical getsockopt return |
|
* values. |
|
* @socket_getpeersec_dgram: |
|
* This hook allows the security module to provide peer socket security |
|
* state for udp sockets on a per-packet basis to userspace via |
|
* getsockopt SO_GETPEERSEC. The application must first have indicated |
|
* the IP_PASSSEC option via getsockopt. It can then retrieve the |
|
* security state returned by this hook for a packet via the SCM_SECURITY |
|
* ancillary message type. |
|
* @sock contains the peer socket. May be NULL. |
|
* @skb is the sk_buff for the packet being queried. May be NULL. |
|
* @secid pointer to store the secid of the packet. |
|
* Return 0 on success, error on failure. |
|
* @sk_alloc_security: |
|
* Allocate and attach a security structure to the sk->sk_security field, |
|
* which is used to copy security attributes between local stream sockets. |
|
* @sk_free_security: |
|
* Deallocate security structure. |
|
* @sk_clone_security: |
|
* Clone/copy security structure. |
|
* @sk_getsecid: |
|
* Retrieve the LSM-specific secid for the sock to enable caching |
|
* of network authorizations. |
|
* @sock_graft: |
|
* Sets the socket's isec sid to the sock's sid. |
|
* @inet_conn_request: |
|
* Sets the openreq's sid to socket's sid with MLS portion taken |
|
* from peer sid. |
|
* @inet_csk_clone: |
|
* Sets the new child socket's sid to the openreq sid. |
|
* @inet_conn_established: |
|
* Sets the connection's peersid to the secmark on skb. |
|
* @secmark_relabel_packet: |
|
* check if the process should be allowed to relabel packets to |
|
* the given secid |
|
* @secmark_refcount_inc: |
|
* tells the LSM to increment the number of secmark labeling rules loaded |
|
* @secmark_refcount_dec: |
|
* tells the LSM to decrement the number of secmark labeling rules loaded |
|
* @req_classify_flow: |
|
* Sets the flow's sid to the openreq sid. |
|
* @tun_dev_alloc_security: |
|
* This hook allows a module to allocate a security structure for a TUN |
|
* device. |
|
* @security pointer to a security structure pointer. |
|
* Returns a zero on success, negative values on failure. |
|
* @tun_dev_free_security: |
|
* This hook allows a module to free the security structure for a TUN |
|
* device. |
|
* @security pointer to the TUN device's security structure |
|
* @tun_dev_create: |
|
* Check permissions prior to creating a new TUN device. |
|
* @tun_dev_attach_queue: |
|
* Check permissions prior to attaching to a TUN device queue. |
|
* @security pointer to the TUN device's security structure. |
|
* @tun_dev_attach: |
|
* This hook can be used by the module to update any security state |
|
* associated with the TUN device's sock structure. |
|
* @sk contains the existing sock structure. |
|
* @security pointer to the TUN device's security structure. |
|
* @tun_dev_open: |
|
* This hook can be used by the module to update any security state |
|
* associated with the TUN device's security structure. |
|
* @security pointer to the TUN devices's security structure. |
|
* |
|
* Security hooks for SCTP |
|
* |
|
* @sctp_assoc_request: |
|
* Passes the @ep and @chunk->skb of the association INIT packet to |
|
* the security module. |
|
* @ep pointer to sctp endpoint structure. |
|
* @skb pointer to skbuff of association packet. |
|
* Return 0 on success, error on failure. |
|
* @sctp_bind_connect: |
|
* Validiate permissions required for each address associated with sock |
|
* @sk. Depending on @optname, the addresses will be treated as either |
|
* for a connect or bind service. The @addrlen is calculated on each |
|
* ipv4 and ipv6 address using sizeof(struct sockaddr_in) or |
|
* sizeof(struct sockaddr_in6). |
|
* @sk pointer to sock structure. |
|
* @optname name of the option to validate. |
|
* @address list containing one or more ipv4/ipv6 addresses. |
|
* @addrlen total length of address(s). |
|
* Return 0 on success, error on failure. |
|
* @sctp_sk_clone: |
|
* Called whenever a new socket is created by accept(2) (i.e. a TCP |
|
* style socket) or when a socket is 'peeled off' e.g userspace |
|
* calls sctp_peeloff(3). |
|
* @ep pointer to current sctp endpoint structure. |
|
* @sk pointer to current sock structure. |
|
* @sk pointer to new sock structure. |
|
* |
|
* Security hooks for Infiniband |
|
* |
|
* @ib_pkey_access: |
|
* Check permission to access a pkey when modifing a QP. |
|
* @subnet_prefix the subnet prefix of the port being used. |
|
* @pkey the pkey to be accessed. |
|
* @sec pointer to a security structure. |
|
* @ib_endport_manage_subnet: |
|
* Check permissions to send and receive SMPs on a end port. |
|
* @dev_name the IB device name (i.e. mlx4_0). |
|
* @port_num the port number. |
|
* @sec pointer to a security structure. |
|
* @ib_alloc_security: |
|
* Allocate a security structure for Infiniband objects. |
|
* @sec pointer to a security structure pointer. |
|
* Returns 0 on success, non-zero on failure |
|
* @ib_free_security: |
|
* Deallocate an Infiniband security structure. |
|
* @sec contains the security structure to be freed. |
|
* |
|
* Security hooks for XFRM operations. |
|
* |
|
* @xfrm_policy_alloc_security: |
|
* @ctxp is a pointer to the xfrm_sec_ctx being added to Security Policy |
|
* Database used by the XFRM system. |
|
* @sec_ctx contains the security context information being provided by |
|
* the user-level policy update program (e.g., setkey). |
|
* Allocate a security structure to the xp->security field; the security |
|
* field is initialized to NULL when the xfrm_policy is allocated. |
|
* Return 0 if operation was successful (memory to allocate, legal context) |
|
* @gfp is to specify the context for the allocation |
|
* @xfrm_policy_clone_security: |
|
* @old_ctx contains an existing xfrm_sec_ctx. |
|
* @new_ctxp contains a new xfrm_sec_ctx being cloned from old. |
|
* Allocate a security structure in new_ctxp that contains the |
|
* information from the old_ctx structure. |
|
* Return 0 if operation was successful (memory to allocate). |
|
* @xfrm_policy_free_security: |
|
* @ctx contains the xfrm_sec_ctx |
|
* Deallocate xp->security. |
|
* @xfrm_policy_delete_security: |
|
* @ctx contains the xfrm_sec_ctx. |
|
* Authorize deletion of xp->security. |
|
* @xfrm_state_alloc: |
|
* @x contains the xfrm_state being added to the Security Association |
|
* Database by the XFRM system. |
|
* @sec_ctx contains the security context information being provided by |
|
* the user-level SA generation program (e.g., setkey or racoon). |
|
* Allocate a security structure to the x->security field; the security |
|
* field is initialized to NULL when the xfrm_state is allocated. Set the |
|
* context to correspond to sec_ctx. Return 0 if operation was successful |
|
* (memory to allocate, legal context). |
|
* @xfrm_state_alloc_acquire: |
|
* @x contains the xfrm_state being added to the Security Association |
|
* Database by the XFRM system. |
|
* @polsec contains the policy's security context. |
|
* @secid contains the secid from which to take the mls portion of the |
|
* context. |
|
* Allocate a security structure to the x->security field; the security |
|
* field is initialized to NULL when the xfrm_state is allocated. Set the |
|
* context to correspond to secid. Return 0 if operation was successful |
|
* (memory to allocate, legal context). |
|
* @xfrm_state_free_security: |
|
* @x contains the xfrm_state. |
|
* Deallocate x->security. |
|
* @xfrm_state_delete_security: |
|
* @x contains the xfrm_state. |
|
* Authorize deletion of x->security. |
|
* @xfrm_policy_lookup: |
|
* @ctx contains the xfrm_sec_ctx for which the access control is being |
|
* checked. |
|
* @fl_secid contains the flow security label that is used to authorize |
|
* access to the policy xp. |
|
* @dir contains the direction of the flow (input or output). |
|
* Check permission when a flow selects a xfrm_policy for processing |
|
* XFRMs on a packet. The hook is called when selecting either a |
|
* per-socket policy or a generic xfrm policy. |
|
* Return 0 if permission is granted, -ESRCH otherwise, or -errno |
|
* on other errors. |
|
* @xfrm_state_pol_flow_match: |
|
* @x contains the state to match. |
|
* @xp contains the policy to check for a match. |
|
* @flic contains the flowi_common struct to check for a match. |
|
* Return 1 if there is a match. |
|
* @xfrm_decode_session: |
|
* @skb points to skb to decode. |
|
* @secid points to the flow key secid to set. |
|
* @ckall says if all xfrms used should be checked for same secid. |
|
* Return 0 if ckall is zero or all xfrms used have the same secid. |
|
* |
|
* Security hooks affecting all Key Management operations |
|
* |
|
* @key_alloc: |
|
* Permit allocation of a key and assign security data. Note that key does |
|
* not have a serial number assigned at this point. |
|
* @key points to the key. |
|
* @flags is the allocation flags |
|
* Return 0 if permission is granted, -ve error otherwise. |
|
* @key_free: |
|
* Notification of destruction; free security data. |
|
* @key points to the key. |
|
* No return value. |
|
* @key_permission: |
|
* See whether a specific operational right is granted to a process on a |
|
* key. |
|
* @key_ref refers to the key (key pointer + possession attribute bit). |
|
* @cred points to the credentials to provide the context against which to |
|
* evaluate the security data on the key. |
|
* @perm describes the combination of permissions required of this key. |
|
* Return 0 if permission is granted, -ve error otherwise. |
|
* @key_getsecurity: |
|
* Get a textual representation of the security context attached to a key |
|
* for the purposes of honouring KEYCTL_GETSECURITY. This function |
|
* allocates the storage for the NUL-terminated string and the caller |
|
* should free it. |
|
* @key points to the key to be queried. |
|
* @_buffer points to a pointer that should be set to point to the |
|
* resulting string (if no label or an error occurs). |
|
* Return the length of the string (including terminating NUL) or -ve if |
|
* an error. |
|
* May also return 0 (and a NULL buffer pointer) if there is no label. |
|
* |
|
* Security hooks affecting all System V IPC operations. |
|
* |
|
* @ipc_permission: |
|
* Check permissions for access to IPC |
|
* @ipcp contains the kernel IPC permission structure |
|
* @flag contains the desired (requested) permission set |
|
* Return 0 if permission is granted. |
|
* @ipc_getsecid: |
|
* Get the secid associated with the ipc object. |
|
* @ipcp contains the kernel IPC permission structure. |
|
* @secid contains a pointer to the location where result will be saved. |
|
* In case of failure, @secid will be set to zero. |
|
* |
|
* Security hooks for individual messages held in System V IPC message queues |
|
* |
|
* @msg_msg_alloc_security: |
|
* Allocate and attach a security structure to the msg->security field. |
|
* The security field is initialized to NULL when the structure is first |
|
* created. |
|
* @msg contains the message structure to be modified. |
|
* Return 0 if operation was successful and permission is granted. |
|
* @msg_msg_free_security: |
|
* Deallocate the security structure for this message. |
|
* @msg contains the message structure to be modified. |
|
* |
|
* Security hooks for System V IPC Message Queues |
|
* |
|
* @msg_queue_alloc_security: |
|
* Allocate and attach a security structure to the |
|
* @perm->security field. The security field is initialized to |
|
* NULL when the structure is first created. |
|
* @perm contains the IPC permissions of the message queue. |
|
* Return 0 if operation was successful and permission is granted. |
|
* @msg_queue_free_security: |
|
* Deallocate security field @perm->security for the message queue. |
|
* @perm contains the IPC permissions of the message queue. |
|
* @msg_queue_associate: |
|
* Check permission when a message queue is requested through the |
|
* msgget system call. This hook is only called when returning the |
|
* message queue identifier for an existing message queue, not when a |
|
* new message queue is created. |
|
* @perm contains the IPC permissions of the message queue. |
|
* @msqflg contains the operation control flags. |
|
* Return 0 if permission is granted. |
|
* @msg_queue_msgctl: |
|
* Check permission when a message control operation specified by @cmd |
|
* is to be performed on the message queue with permissions @perm. |
|
* The @perm may be NULL, e.g. for IPC_INFO or MSG_INFO. |
|
* @perm contains the IPC permissions of the msg queue. May be NULL. |
|
* @cmd contains the operation to be performed. |
|
* Return 0 if permission is granted. |
|
* @msg_queue_msgsnd: |
|
* Check permission before a message, @msg, is enqueued on the message |
|
* queue with permissions @perm. |
|
* @perm contains the IPC permissions of the message queue. |
|
* @msg contains the message to be enqueued. |
|
* @msqflg contains operational flags. |
|
* Return 0 if permission is granted. |
|
* @msg_queue_msgrcv: |
|
* Check permission before a message, @msg, is removed from the message |
|
* queue. The @target task structure contains a pointer to the |
|
* process that will be receiving the message (not equal to the current |
|
* process when inline receives are being performed). |
|
* @perm contains the IPC permissions of the message queue. |
|
* @msg contains the message destination. |
|
* @target contains the task structure for recipient process. |
|
* @type contains the type of message requested. |
|
* @mode contains the operational flags. |
|
* Return 0 if permission is granted. |
|
* |
|
* Security hooks for System V Shared Memory Segments |
|
* |
|
* @shm_alloc_security: |
|
* Allocate and attach a security structure to the @perm->security |
|
* field. The security field is initialized to NULL when the structure is |
|
* first created. |
|
* @perm contains the IPC permissions of the shared memory structure. |
|
* Return 0 if operation was successful and permission is granted. |
|
* @shm_free_security: |
|
* Deallocate the security structure @perm->security for the memory segment. |
|
* @perm contains the IPC permissions of the shared memory structure. |
|
* @shm_associate: |
|
* Check permission when a shared memory region is requested through the |
|
* shmget system call. This hook is only called when returning the shared |
|
* memory region identifier for an existing region, not when a new shared |
|
* memory region is created. |
|
* @perm contains the IPC permissions of the shared memory structure. |
|
* @shmflg contains the operation control flags. |
|
* Return 0 if permission is granted. |
|
* @shm_shmctl: |
|
* Check permission when a shared memory control operation specified by |
|
* @cmd is to be performed on the shared memory region with permissions @perm. |
|
* The @perm may be NULL, e.g. for IPC_INFO or SHM_INFO. |
|
* @perm contains the IPC permissions of the shared memory structure. |
|
* @cmd contains the operation to be performed. |
|
* Return 0 if permission is granted. |
|
* @shm_shmat: |
|
* Check permissions prior to allowing the shmat system call to attach the |
|
* shared memory segment with permissions @perm to the data segment of the |
|
* calling process. The attaching address is specified by @shmaddr. |
|
* @perm contains the IPC permissions of the shared memory structure. |
|
* @shmaddr contains the address to attach memory region to. |
|
* @shmflg contains the operational flags. |
|
* Return 0 if permission is granted. |
|
* |
|
* Security hooks for System V Semaphores |
|
* |
|
* @sem_alloc_security: |
|
* Allocate and attach a security structure to the @perm->security |
|
* field. The security field is initialized to NULL when the structure is |
|
* first created. |
|
* @perm contains the IPC permissions of the semaphore. |
|
* Return 0 if operation was successful and permission is granted. |
|
* @sem_free_security: |
|
* Deallocate security structure @perm->security for the semaphore. |
|
* @perm contains the IPC permissions of the semaphore. |
|
* @sem_associate: |
|
* Check permission when a semaphore is requested through the semget |
|
* system call. This hook is only called when returning the semaphore |
|
* identifier for an existing semaphore, not when a new one must be |
|
* created. |
|
* @perm contains the IPC permissions of the semaphore. |
|
* @semflg contains the operation control flags. |
|
* Return 0 if permission is granted. |
|
* @sem_semctl: |
|
* Check permission when a semaphore operation specified by @cmd is to be |
|
* performed on the semaphore. The @perm may be NULL, e.g. for |
|
* IPC_INFO or SEM_INFO. |
|
* @perm contains the IPC permissions of the semaphore. May be NULL. |
|
* @cmd contains the operation to be performed. |
|
* Return 0 if permission is granted. |
|
* @sem_semop: |
|
* Check permissions before performing operations on members of the |
|
* semaphore set. If the @alter flag is nonzero, the semaphore set |
|
* may be modified. |
|
* @perm contains the IPC permissions of the semaphore. |
|
* @sops contains the operations to perform. |
|
* @nsops contains the number of operations to perform. |
|
* @alter contains the flag indicating whether changes are to be made. |
|
* Return 0 if permission is granted. |
|
* |
|
* @binder_set_context_mgr: |
|
* Check whether @mgr is allowed to be the binder context manager. |
|
* @mgr contains the task_struct for the task being registered. |
|
* Return 0 if permission is granted. |
|
* @binder_transaction: |
|
* Check whether @from is allowed to invoke a binder transaction call |
|
* to @to. |
|
* @from contains the task_struct for the sending task. |
|
* @to contains the task_struct for the receiving task. |
|
* @binder_transfer_binder: |
|
* Check whether @from is allowed to transfer a binder reference to @to. |
|
* @from contains the task_struct for the sending task. |
|
* @to contains the task_struct for the receiving task. |
|
* @binder_transfer_file: |
|
* Check whether @from is allowed to transfer @file to @to. |
|
* @from contains the task_struct for the sending task. |
|
* @file contains the struct file being transferred. |
|
* @to contains the task_struct for the receiving task. |
|
* |
|
* @ptrace_access_check: |
|
* Check permission before allowing the current process to trace the |
|
* @child process. |
|
* Security modules may also want to perform a process tracing check |
|
* during an execve in the set_security or apply_creds hooks of |
|
* tracing check during an execve in the bprm_set_creds hook of |
|
* binprm_security_ops if the process is being traced and its security |
|
* attributes would be changed by the execve. |
|
* @child contains the task_struct structure for the target process. |
|
* @mode contains the PTRACE_MODE flags indicating the form of access. |
|
* Return 0 if permission is granted. |
|
* @ptrace_traceme: |
|
* Check that the @parent process has sufficient permission to trace the |
|
* current process before allowing the current process to present itself |
|
* to the @parent process for tracing. |
|
* @parent contains the task_struct structure for debugger process. |
|
* Return 0 if permission is granted. |
|
* @capget: |
|
* Get the @effective, @inheritable, and @permitted capability sets for |
|
* the @target process. The hook may also perform permission checking to |
|
* determine if the current process is allowed to see the capability sets |
|
* of the @target process. |
|
* @target contains the task_struct structure for target process. |
|
* @effective contains the effective capability set. |
|
* @inheritable contains the inheritable capability set. |
|
* @permitted contains the permitted capability set. |
|
* Return 0 if the capability sets were successfully obtained. |
|
* @capset: |
|
* Set the @effective, @inheritable, and @permitted capability sets for |
|
* the current process. |
|
* @new contains the new credentials structure for target process. |
|
* @old contains the current credentials structure for target process. |
|
* @effective contains the effective capability set. |
|
* @inheritable contains the inheritable capability set. |
|
* @permitted contains the permitted capability set. |
|
* Return 0 and update @new if permission is granted. |
|
* @capable: |
|
* Check whether the @tsk process has the @cap capability in the indicated |
|
* credentials. |
|
* @cred contains the credentials to use. |
|
* @ns contains the user namespace we want the capability in |
|
* @cap contains the capability <include/linux/capability.h>. |
|
* @opts contains options for the capable check <include/linux/security.h> |
|
* Return 0 if the capability is granted for @tsk. |
|
* @quotactl: |
|
* Check whether the quotactl syscall is allowed for this @sb. |
|
* @quota_on: |
|
* Check whether QUOTAON is allowed for this @dentry. |
|
* @syslog: |
|
* Check permission before accessing the kernel message ring or changing |
|
* logging to the console. |
|
* See the syslog(2) manual page for an explanation of the @type values. |
|
* @type contains the SYSLOG_ACTION_* constant from <include/linux/syslog.h> |
|
* Return 0 if permission is granted. |
|
* @settime: |
|
* Check permission to change the system time. |
|
* struct timespec64 is defined in <include/linux/time64.h> and timezone |
|
* is defined in <include/linux/time.h> |
|
* @ts contains new time |
|
* @tz contains new timezone |
|
* Return 0 if permission is granted. |
|
* @vm_enough_memory: |
|
* Check permissions for allocating a new virtual mapping. |
|
* @mm contains the mm struct it is being added to. |
|
* @pages contains the number of pages. |
|
* Return 0 if permission is granted. |
|
* |
|
* @ismaclabel: |
|
* Check if the extended attribute specified by @name |
|
* represents a MAC label. Returns 1 if name is a MAC |
|
* attribute otherwise returns 0. |
|
* @name full extended attribute name to check against |
|
* LSM as a MAC label. |
|
* |
|
* @secid_to_secctx: |
|
* Convert secid to security context. If secdata is NULL the length of |
|
* the result will be returned in seclen, but no secdata will be returned. |
|
* This does mean that the length could change between calls to check the |
|
* length and the next call which actually allocates and returns the |
|
* secdata. |
|
* @secid contains the security ID. |
|
* @secdata contains the pointer that stores the converted security |
|
* context. |
|
* @seclen pointer which contains the length of the data |
|
* @secctx_to_secid: |
|
* Convert security context to secid. |
|
* @secid contains the pointer to the generated security ID. |
|
* @secdata contains the security context. |
|
* |
|
* @release_secctx: |
|
* Release the security context. |
|
* @secdata contains the security context. |
|
* @seclen contains the length of the security context. |
|
* |
|
* Security hooks for Audit |
|
* |
|
* @audit_rule_init: |
|
* Allocate and initialize an LSM audit rule structure. |
|
* @field contains the required Audit action. |
|
* Fields flags are defined in <include/linux/audit.h> |
|
* @op contains the operator the rule uses. |
|
* @rulestr contains the context where the rule will be applied to. |
|
* @lsmrule contains a pointer to receive the result. |
|
* Return 0 if @lsmrule has been successfully set, |
|
* -EINVAL in case of an invalid rule. |
|
* |
|
* @audit_rule_known: |
|
* Specifies whether given @krule contains any fields related to |
|
* current LSM. |
|
* @krule contains the audit rule of interest. |
|
* Return 1 in case of relation found, 0 otherwise. |
|
* |
|
* @audit_rule_match: |
|
* Determine if given @secid matches a rule previously approved |
|
* by @audit_rule_known. |
|
* @secid contains the security id in question. |
|
* @field contains the field which relates to current LSM. |
|
* @op contains the operator that will be used for matching. |
|
* @lrule points to the audit rule that will be checked against. |
|
* Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure. |
|
* |
|
* @audit_rule_free: |
|
* Deallocate the LSM audit rule structure previously allocated by |
|
* audit_rule_init. |
|
* @lsmrule contains the allocated rule |
|
* |
|
* @inode_invalidate_secctx: |
|
* Notify the security module that it must revalidate the security context |
|
* of an inode. |
|
* |
|
* @inode_notifysecctx: |
|
* Notify the security module of what the security context of an inode |
|
* should be. Initializes the incore security context managed by the |
|
* security module for this inode. Example usage: NFS client invokes |
|
* this hook to initialize the security context in its incore inode to the |
|
* value provided by the server for the file when the server returned the |
|
* file's attributes to the client. |
|
* Must be called with inode->i_mutex locked. |
|
* @inode we wish to set the security context of. |
|
* @ctx contains the string which we wish to set in the inode. |
|
* @ctxlen contains the length of @ctx. |
|
* |
|
* @inode_setsecctx: |
|
* Change the security context of an inode. Updates the |
|
* incore security context managed by the security module and invokes the |
|
* fs code as needed (via __vfs_setxattr_noperm) to update any backing |
|
* xattrs that represent the context. Example usage: NFS server invokes |
|
* this hook to change the security context in its incore inode and on the |
|
* backing filesystem to a value provided by the client on a SETATTR |
|
* operation. |
|
* Must be called with inode->i_mutex locked. |
|
* @dentry contains the inode we wish to set the security context of. |
|
* @ctx contains the string which we wish to set in the inode. |
|
* @ctxlen contains the length of @ctx. |
|
* |
|
* @inode_getsecctx: |
|
* On success, returns 0 and fills out @ctx and @ctxlen with the security |
|
* context for the given @inode. |
|
* @inode we wish to get the security context of. |
|
* @ctx is a pointer in which to place the allocated security context. |
|
* @ctxlen points to the place to put the length of @ctx. |
|
* |
|
* Security hooks for the general notification queue: |
|
* |
|
* @post_notification: |
|
* Check to see if a watch notification can be posted to a particular |
|
* queue. |
|
* @w_cred: The credentials of the whoever set the watch. |
|
* @cred: The event-triggerer's credentials |
|
* @n: The notification being posted |
|
* |
|
* @watch_key: |
|
* Check to see if a process is allowed to watch for event notifications |
|
* from a key or keyring. |
|
* @key: The key to watch. |
|
* |
|
* Security hooks for using the eBPF maps and programs functionalities through |
|
* eBPF syscalls. |
|
* |
|
* @bpf: |
|
* Do a initial check for all bpf syscalls after the attribute is copied |
|
* into the kernel. The actual security module can implement their own |
|
* rules to check the specific cmd they need. |
|
* |
|
* @bpf_map: |
|
* Do a check when the kernel generate and return a file descriptor for |
|
* eBPF maps. |
|
* |
|
* @map: bpf map that we want to access |
|
* @mask: the access flags |
|
* |
|
* @bpf_prog: |
|
* Do a check when the kernel generate and return a file descriptor for |
|
* eBPF programs. |
|
* |
|
* @prog: bpf prog that userspace want to use. |
|
* |
|
* @bpf_map_alloc_security: |
|
* Initialize the security field inside bpf map. |
|
* |
|
* @bpf_map_free_security: |
|
* Clean up the security information stored inside bpf map. |
|
* |
|
* @bpf_prog_alloc_security: |
|
* Initialize the security field inside bpf program. |
|
* |
|
* @bpf_prog_free_security: |
|
* Clean up the security information stored inside bpf prog. |
|
* |
|
* @locked_down: |
|
* Determine whether a kernel feature that potentially enables arbitrary |
|
* code execution in kernel space should be permitted. |
|
* |
|
* @what: kernel feature being accessed |
|
* |
|
* Security hooks for perf events |
|
* |
|
* @perf_event_open: |
|
* Check whether the @type of perf_event_open syscall is allowed. |
|
* @perf_event_alloc: |
|
* Allocate and save perf_event security info. |
|
* @perf_event_free: |
|
* Release (free) perf_event security info. |
|
* @perf_event_read: |
|
* Read perf_event security info if allowed. |
|
* @perf_event_write: |
|
* Write perf_event security info if allowed. |
|
*/ |
|
union security_list_options { |
|
#define LSM_HOOK(RET, DEFAULT, NAME, ...) RET (*NAME)(__VA_ARGS__); |
|
#include "lsm_hook_defs.h" |
|
#undef LSM_HOOK |
|
}; |
|
|
|
struct security_hook_heads { |
|
#define LSM_HOOK(RET, DEFAULT, NAME, ...) struct hlist_head NAME; |
|
#include "lsm_hook_defs.h" |
|
#undef LSM_HOOK |
|
} __randomize_layout; |
|
|
|
/* |
|
* Security module hook list structure. |
|
* For use with generic list macros for common operations. |
|
*/ |
|
struct security_hook_list { |
|
struct hlist_node list; |
|
struct hlist_head *head; |
|
union security_list_options hook; |
|
char *lsm; |
|
} __randomize_layout; |
|
|
|
/* |
|
* Security blob size or offset data. |
|
*/ |
|
struct lsm_blob_sizes { |
|
int lbs_cred; |
|
int lbs_file; |
|
int lbs_inode; |
|
int lbs_ipc; |
|
int lbs_msg_msg; |
|
int lbs_task; |
|
}; |
|
|
|
/* |
|
* LSM_RET_VOID is used as the default value in LSM_HOOK definitions for void |
|
* LSM hooks (in include/linux/lsm_hook_defs.h). |
|
*/ |
|
#define LSM_RET_VOID ((void) 0) |
|
|
|
/* |
|
* Initializing a security_hook_list structure takes |
|
* up a lot of space in a source file. This macro takes |
|
* care of the common case and reduces the amount of |
|
* text involved. |
|
*/ |
|
#define LSM_HOOK_INIT(HEAD, HOOK) \ |
|
{ .head = &security_hook_heads.HEAD, .hook = { .HEAD = HOOK } } |
|
|
|
extern struct security_hook_heads security_hook_heads; |
|
extern char *lsm_names; |
|
|
|
extern void security_add_hooks(struct security_hook_list *hooks, int count, |
|
char *lsm); |
|
|
|
#define LSM_FLAG_LEGACY_MAJOR BIT(0) |
|
#define LSM_FLAG_EXCLUSIVE BIT(1) |
|
|
|
enum lsm_order { |
|
LSM_ORDER_FIRST = -1, /* This is only for capabilities. */ |
|
LSM_ORDER_MUTABLE = 0, |
|
}; |
|
|
|
struct lsm_info { |
|
const char *name; /* Required. */ |
|
enum lsm_order order; /* Optional: default is LSM_ORDER_MUTABLE */ |
|
unsigned long flags; /* Optional: flags describing LSM */ |
|
int *enabled; /* Optional: controlled by CONFIG_LSM */ |
|
int (*init)(void); /* Required. */ |
|
struct lsm_blob_sizes *blobs; /* Optional: for blob sharing. */ |
|
}; |
|
|
|
extern struct lsm_info __start_lsm_info[], __end_lsm_info[]; |
|
extern struct lsm_info __start_early_lsm_info[], __end_early_lsm_info[]; |
|
|
|
#define DEFINE_LSM(lsm) \ |
|
static struct lsm_info __lsm_##lsm \ |
|
__used __section(".lsm_info.init") \ |
|
__aligned(sizeof(unsigned long)) |
|
|
|
#define DEFINE_EARLY_LSM(lsm) \ |
|
static struct lsm_info __early_lsm_##lsm \ |
|
__used __section(".early_lsm_info.init") \ |
|
__aligned(sizeof(unsigned long)) |
|
|
|
#ifdef CONFIG_SECURITY_SELINUX_DISABLE |
|
/* |
|
* Assuring the safety of deleting a security module is up to |
|
* the security module involved. This may entail ordering the |
|
* module's hook list in a particular way, refusing to disable |
|
* the module once a policy is loaded or any number of other |
|
* actions better imagined than described. |
|
* |
|
* The name of the configuration option reflects the only module |
|
* that currently uses the mechanism. Any developer who thinks |
|
* disabling their module is a good idea needs to be at least as |
|
* careful as the SELinux team. |
|
*/ |
|
static inline void security_delete_hooks(struct security_hook_list *hooks, |
|
int count) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < count; i++) |
|
hlist_del_rcu(&hooks[i].list); |
|
} |
|
#endif /* CONFIG_SECURITY_SELINUX_DISABLE */ |
|
|
|
/* Currently required to handle SELinux runtime hook disable. */ |
|
#ifdef CONFIG_SECURITY_WRITABLE_HOOKS |
|
#define __lsm_ro_after_init |
|
#else |
|
#define __lsm_ro_after_init __ro_after_init |
|
#endif /* CONFIG_SECURITY_WRITABLE_HOOKS */ |
|
|
|
extern int lsm_inode_alloc(struct inode *inode); |
|
|
|
#endif /* ! __LINUX_LSM_HOOKS_H */
|
|
|