^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * fs/sdcardfs/sdcardfs.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * The sdcardfs v2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * This file system replaces the sdcard daemon on Android
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * On version 2.0, some of the daemon functions have been ported
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * to support the multi-user concepts of Android 4.4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Copyright (c) 2013 Samsung Electronics Co. Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Sunghwan Yun, Sungjong Seo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * This program has been developed as a stackable file system based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * the WrapFS which written by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Copyright (c) 1998-2011 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Copyright (c) 2009 Shrikar Archak
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Copyright (c) 2003-2011 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * Copyright (c) 2003-2011 The Research Foundation of SUNY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * This file is dual licensed. It may be redistributed and/or modified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * under the terms of the Apache 2.0 License OR version 2 of the GNU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #ifndef _SDCARDFS_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define _SDCARDFS_H_
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/dcache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/aio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/kref.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/mount.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/namei.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/seq_file.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/statfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/fs_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/magic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #include "multiuser.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* the file system name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define SDCARDFS_NAME "sdcardfs"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /* sdcardfs root inode number */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define SDCARDFS_ROOT_INO 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) /* useful for tracking code reachability */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define UDBG pr_default("DBG:%s:%s:%d\n", __FILE__, __func__, __LINE__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #define SDCARDFS_DIRENT_SIZE 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /* temporary static uid settings for development */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) #define AID_ROOT 0 /* uid for accessing /mnt/sdcard & extSdcard */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define AID_MEDIA_RW 1023 /* internal media storage write access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) #define AID_SDCARD_RW 1015 /* external storage write access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) #define AID_SDCARD_R 1028 /* external storage read access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) #define AID_SDCARD_PICS 1033 /* external storage photos access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #define AID_SDCARD_AV 1034 /* external storage audio/video access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) #define AID_SDCARD_ALL 1035 /* access all users external storage */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #define AID_MEDIA_OBB 1059 /* obb files */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) #define AID_SDCARD_IMAGE 1057
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) #define AID_PACKAGE_INFO 1027
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) * Permissions are handled by our permission function.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * We don't want anyone who happens to look at our inode value to prematurely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * block access, so store more permissive values. These are probably never
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) * used.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #define fixup_tmp_permissions(x) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) do { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) (x)->i_uid = make_kuid(&init_user_ns, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) SDCARDFS_I(x)->data->d_uid); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) (x)->i_gid = make_kgid(&init_user_ns, AID_SDCARD_RW); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) (x)->i_mode = ((x)->i_mode & S_IFMT) | 0775;\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Android 5.0 support */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) /* Permission mode for a specific node. Controls how file permissions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) * are derived for children nodes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) typedef enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) /* Nothing special; this node should just inherit from its parent. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) PERM_INHERIT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) /* This node is one level above a normal root; used for legacy layouts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * which use the first level to represent user_id.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) PERM_PRE_ROOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* This node is "/" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) PERM_ROOT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) /* This node is "/Android" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) PERM_ANDROID,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) /* This node is "/Android/data" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) PERM_ANDROID_DATA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) /* This node is "/Android/obb" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) PERM_ANDROID_OBB,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* This node is "/Android/media" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) PERM_ANDROID_MEDIA,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* This node is "/Android/[data|media|obb]/[package]" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) PERM_ANDROID_PACKAGE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) /* This node is "/Android/[data|media|obb]/[package]/cache" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) PERM_ANDROID_PACKAGE_CACHE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) } perm_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) struct sdcardfs_sb_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) struct sdcardfs_mount_options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) struct sdcardfs_inode_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) struct sdcardfs_inode_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) /* Do not directly use this function. Use OVERRIDE_CRED() instead. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) const struct cred *override_fsids(struct sdcardfs_sb_info *sbi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct sdcardfs_inode_data *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) /* Do not directly use this function, use REVERT_CRED() instead. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void revert_fsids(const struct cred *old_cred);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* operations vectors defined in specific files */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) extern const struct file_operations sdcardfs_main_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) extern const struct file_operations sdcardfs_dir_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) extern const struct inode_operations sdcardfs_main_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) extern const struct inode_operations sdcardfs_dir_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) extern const struct inode_operations sdcardfs_symlink_iops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) extern const struct super_operations sdcardfs_sops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) extern const struct dentry_operations sdcardfs_ci_dops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) extern const struct address_space_operations sdcardfs_aops, sdcardfs_dummy_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) extern const struct vm_operations_struct sdcardfs_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) extern int sdcardfs_init_inode_cache(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) extern void sdcardfs_destroy_inode_cache(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) extern int sdcardfs_init_dentry_cache(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) extern void sdcardfs_destroy_dentry_cache(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) extern int new_dentry_private_data(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) extern void free_dentry_private_data(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) extern struct dentry *sdcardfs_lookup(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) unsigned int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) extern struct inode *sdcardfs_iget(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) struct inode *lower_inode, userid_t id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) extern int sdcardfs_interpose(struct dentry *dentry, struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) struct path *lower_path, userid_t id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) extern int sdcardfs_on_fscrypt_key_removed(struct notifier_block *nb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) unsigned long action, void *data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* file private data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) struct sdcardfs_file_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct file *lower_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) const struct vm_operations_struct *lower_vm_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) struct sdcardfs_inode_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct kref refcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) bool abandoned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) perm_t perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) userid_t userid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) uid_t d_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) bool under_android;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) bool under_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) bool under_obb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* sdcardfs inode data in memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct sdcardfs_inode_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) struct inode *lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) /* state derived based on current position in hierarchy */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct sdcardfs_inode_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) /* top folder for ownership */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) spinlock_t top_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct sdcardfs_inode_data *top_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) struct inode vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) /* sdcardfs dentry data in memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) struct sdcardfs_dentry_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) spinlock_t lock; /* protects lower_path */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) struct path lower_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct path orig_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct sdcardfs_mount_options {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) uid_t fs_low_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) gid_t fs_low_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) userid_t fs_user_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) bool multiuser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) bool gid_derivation;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) bool default_normal;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) bool unshared_obb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) unsigned int reserved_mb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) bool nocache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) struct sdcardfs_vfsmount_options {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) gid_t gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) mode_t mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) extern int parse_options_remount(struct super_block *sb, char *options, int silent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) struct sdcardfs_vfsmount_options *vfsopts);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) /* sdcardfs super-block data in memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) struct sdcardfs_sb_info {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct super_block *lower_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* derived perm policy : some of options have been added
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) * to sdcardfs_mount_options (Android 4.4 support)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct sdcardfs_mount_options options;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) spinlock_t lock; /* protects obbpath */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) char *obbpath_s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct path obbpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) void *pkgl_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) struct notifier_block fscrypt_nb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) * inode to private data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) * Since we use containers and the struct inode is _inside_ the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) * sdcardfs_inode_info structure, SDCARDFS_I will always (given a non-NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) * inode pointer), return a valid non-NULL pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) static inline struct sdcardfs_inode_info *SDCARDFS_I(const struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) return container_of(inode, struct sdcardfs_inode_info, vfs_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) /* dentry to private data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) #define SDCARDFS_D(dent) ((struct sdcardfs_dentry_info *)(dent)->d_fsdata)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /* superblock to private data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) #define SDCARDFS_SB(super) ((struct sdcardfs_sb_info *)(super)->s_fs_info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) /* file to private Data */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) #define SDCARDFS_F(file) ((struct sdcardfs_file_info *)((file)->private_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) /* file to lower file */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) static inline struct file *sdcardfs_lower_file(const struct file *f)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) return SDCARDFS_F(f)->lower_file;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) static inline void sdcardfs_set_lower_file(struct file *f, struct file *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) SDCARDFS_F(f)->lower_file = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) /* inode to lower inode. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) static inline struct inode *sdcardfs_lower_inode(const struct inode *i)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) return SDCARDFS_I(i)->lower_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static inline void sdcardfs_set_lower_inode(struct inode *i, struct inode *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) SDCARDFS_I(i)->lower_inode = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) /* superblock to lower superblock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static inline struct super_block *sdcardfs_lower_super(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) const struct super_block *sb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) return SDCARDFS_SB(sb)->lower_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static inline void sdcardfs_set_lower_super(struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) struct super_block *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) SDCARDFS_SB(sb)->lower_sb = val;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) /* path based (dentry/mnt) macros */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static inline void pathcpy(struct path *dst, const struct path *src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) dst->dentry = src->dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) dst->mnt = src->mnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) /* sdcardfs_get_pname functions calls path_get()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * therefore, the caller must call "proper" path_put functions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) #define SDCARDFS_DENT_FUNC(pname) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) static inline void sdcardfs_get_##pname(const struct dentry *dent, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct path *pname) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) spin_lock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) pathcpy(pname, &SDCARDFS_D(dent)->pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) path_get(pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) spin_unlock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) static inline void sdcardfs_put_##pname(const struct dentry *dent, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) struct path *pname) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) path_put(pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) static inline void sdcardfs_set_##pname(const struct dentry *dent, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) struct path *pname) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) spin_lock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) pathcpy(&SDCARDFS_D(dent)->pname, pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) spin_unlock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) static inline void sdcardfs_reset_##pname(const struct dentry *dent) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) spin_lock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) SDCARDFS_D(dent)->pname.dentry = NULL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) SDCARDFS_D(dent)->pname.mnt = NULL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) spin_unlock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) static inline void sdcardfs_put_reset_##pname(const struct dentry *dent) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) struct path pname; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) spin_lock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) if (SDCARDFS_D(dent)->pname.dentry) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) pathcpy(&pname, &SDCARDFS_D(dent)->pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) SDCARDFS_D(dent)->pname.dentry = NULL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) SDCARDFS_D(dent)->pname.mnt = NULL; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) spin_unlock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) path_put(&pname); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) } else \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) spin_unlock(&SDCARDFS_D(dent)->lock); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) return; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) SDCARDFS_DENT_FUNC(lower_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) SDCARDFS_DENT_FUNC(orig_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) static inline bool sbinfo_has_sdcard_magic(struct sdcardfs_sb_info *sbinfo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) return sbinfo && sbinfo->sb
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) && sbinfo->sb->s_magic == SDCARDFS_SUPER_MAGIC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) static inline struct sdcardfs_inode_data *data_get(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) struct sdcardfs_inode_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) if (data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) kref_get(&data->refcount);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static inline struct sdcardfs_inode_data *top_data_get(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) struct sdcardfs_inode_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) struct sdcardfs_inode_data *top_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) spin_lock(&info->top_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) top_data = data_get(info->top_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) spin_unlock(&info->top_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) return top_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) extern void data_release(struct kref *ref);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) static inline void data_put(struct sdcardfs_inode_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) kref_put(&data->refcount, data_release);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) static inline void release_own_data(struct sdcardfs_inode_info *info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * This happens exactly once per inode. At this point, the inode that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) * originally held this data is about to be freed, and all references
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) * to it are held as a top value, and will likely be released soon.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) info->data->abandoned = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) data_put(info->data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) static inline void set_top(struct sdcardfs_inode_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) struct sdcardfs_inode_info *top_owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) struct sdcardfs_inode_data *old_top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) struct sdcardfs_inode_data *new_top = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) if (top_owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) new_top = top_data_get(top_owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) spin_lock(&info->top_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) old_top = info->top_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) info->top_data = new_top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (old_top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) data_put(old_top);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) spin_unlock(&info->top_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) static inline int get_gid(struct vfsmount *mnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct super_block *sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct sdcardfs_inode_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) struct sdcardfs_vfsmount_options *vfsopts = mnt->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (vfsopts->gid == AID_SDCARD_RW && !sbi->options.default_normal)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) /* As an optimization, certain trusted system components only run
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) * as owner but operate across all users. Since we're now handing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) * out the sdcard_rw GID only to trusted apps, we're okay relaxing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) * the user boundary enforcement for the default view. The UIDs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) * assigned to app directories are still multiuser aware.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) return AID_SDCARD_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) return multiuser_get_uid(data->userid, vfsopts->gid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) static inline int get_mode(struct vfsmount *mnt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) struct sdcardfs_inode_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) struct sdcardfs_inode_data *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) int owner_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) int filtered_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) struct sdcardfs_vfsmount_options *opts = mnt->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) int visible_mode = 0775 & ~opts->mask;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) if (data->perm == PERM_PRE_ROOT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) /* Top of multi-user view should always be visible to ensure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) * secondary users can traverse inside.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) visible_mode = 0711;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) } else if (data->under_android) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) /* Block "other" access to Android directories, since only apps
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * belonging to a specific user should be in there; we still
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * leave +x open for the default view.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) if (opts->gid == AID_SDCARD_RW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) visible_mode = visible_mode & ~0006;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) visible_mode = visible_mode & ~0007;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) owner_mode = info->lower_inode->i_mode & 0700;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) filtered_mode = visible_mode & (owner_mode | (owner_mode >> 3) | (owner_mode >> 6));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) return filtered_mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) static inline int has_graft_path(const struct dentry *dent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) spin_lock(&SDCARDFS_D(dent)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (SDCARDFS_D(dent)->orig_path.dentry != NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) spin_unlock(&SDCARDFS_D(dent)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static inline void sdcardfs_get_real_lower(const struct dentry *dent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) struct path *real_lower)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) /* in case of a local obb dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) * the orig_path should be returned
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) if (has_graft_path(dent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) sdcardfs_get_orig_path(dent, real_lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) sdcardfs_get_lower_path(dent, real_lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) static inline void sdcardfs_put_real_lower(const struct dentry *dent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) struct path *real_lower)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) if (has_graft_path(dent))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) sdcardfs_put_orig_path(dent, real_lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) sdcardfs_put_lower_path(dent, real_lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) extern struct mutex sdcardfs_super_list_lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) extern struct list_head sdcardfs_super_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) /* for packagelist.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) extern appid_t get_appid(const char *app_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) extern appid_t get_ext_gid(const char *app_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) extern appid_t is_excluded(const char *app_name, userid_t userid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) extern int check_caller_access_to_name(struct inode *parent_node, const struct qstr *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) extern int packagelist_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) extern void packagelist_exit(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) /* for derived_perm.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) #define BY_NAME (1 << 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) #define BY_USERID (1 << 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) struct limit_search {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) unsigned int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) struct qstr name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) userid_t userid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) extern void setup_derived_state(struct inode *inode, perm_t perm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) userid_t userid, uid_t uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) extern void get_derived_permission(struct dentry *parent, struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) extern void get_derived_permission_new(struct dentry *parent, struct dentry *dentry, const struct qstr *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) extern void fixup_perms_recursive(struct dentry *dentry, struct limit_search *limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) extern void update_derived_permission_lock(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) void fixup_lower_ownership(struct dentry *dentry, const char *name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) extern int need_graft_path(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) extern int is_base_obbpath(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) extern int is_obbpath_invalid(struct dentry *dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) extern int setup_obb_dentry(struct dentry *dentry, struct path *lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /* locking helpers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) static inline struct dentry *lock_parent(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) struct dentry *dir = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) static inline void unlock_dir(struct dentry *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) inode_unlock(d_inode(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) dput(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) static inline int prepare_dir(const char *path_s, uid_t uid, gid_t gid, mode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) struct dentry *dent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) struct iattr attrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) struct path parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) dent = kern_path_locked(path_s, &parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) if (IS_ERR(dent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) err = PTR_ERR(dent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) if (err == -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) goto out_unlock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) err = vfs_mkdir2(parent.mnt, d_inode(parent.dentry), dent, mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) if (err == -EEXIST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) goto out_dput;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) attrs.ia_uid = make_kuid(&init_user_ns, uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) attrs.ia_gid = make_kgid(&init_user_ns, gid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) attrs.ia_valid = ATTR_UID | ATTR_GID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) inode_lock(d_inode(dent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) notify_change2(parent.mnt, dent, &attrs, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) inode_unlock(d_inode(dent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) out_dput:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) dput(dent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) out_unlock:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) /* parent dentry locked by lookup_create */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) inode_unlock(d_inode(parent.dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) path_put(&parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) * Return 1, if a disk has enough free space, otherwise 0.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) * We assume that any files can not be overwritten.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static inline int check_min_free_space(struct dentry *dentry, size_t size, int dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) struct path lower_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) struct kstatfs statfs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) u64 avail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) if (sbi->options.reserved_mb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) /* Get fs stat of lower filesystem. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) sdcardfs_get_lower_path(dentry, &lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) err = vfs_statfs(&lower_path, &statfs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) sdcardfs_put_lower_path(dentry, &lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) /* Invalid statfs informations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) if (unlikely(statfs.f_bsize == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) /* if you are checking directory, set size to f_bsize. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) if (unlikely(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) size = statfs.f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) /* available size */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) avail = statfs.f_bavail * statfs.f_bsize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) /* not enough space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) if ((u64)size > avail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) /* enough space */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) if ((avail - size) > (sbi->options.reserved_mb * 1024 * 1024))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) * Copies attrs and maintains sdcardfs managed attrs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) * Since our permission check handles all special permissions, set those to be open
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) static inline void sdcardfs_copy_and_fix_attrs(struct inode *dest, const struct inode *src)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) dest->i_mode = (src->i_mode & S_IFMT) | S_IRWXU | S_IRWXG |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) S_IROTH | S_IXOTH; /* 0775 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) dest->i_uid = make_kuid(&init_user_ns, SDCARDFS_I(dest)->data->d_uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) dest->i_gid = make_kgid(&init_user_ns, AID_SDCARD_RW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) dest->i_rdev = src->i_rdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) dest->i_atime = src->i_atime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) dest->i_mtime = src->i_mtime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) dest->i_ctime = src->i_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) dest->i_blkbits = src->i_blkbits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) dest->i_flags = src->i_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) set_nlink(dest, src->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) static inline bool str_case_eq(const char *s1, const char *s2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) return !strcasecmp(s1, s2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) static inline bool str_n_case_eq(const char *s1, const char *s2, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) return !strncasecmp(s1, s2, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) static inline bool qstr_case_eq(const struct qstr *q1, const struct qstr *q2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) return q1->len == q2->len && str_n_case_eq(q1->name, q2->name, q2->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) #define QSTR_LITERAL(string) QSTR_INIT(string, sizeof(string)-1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) #endif /* not _SDCARDFS_H_ */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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