^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * fs/sdcardfs/derived_perm.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2013 Samsung Electronics Co. Ltd
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Authors: Daeho Jeong, Woojoong Lee, Seunghwan Hyun,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Sunghwan Yun, Sungjong Seo
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * This program has been developed as a stackable file system based on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * the WrapFS which written by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (c) 1998-2011 Erez Zadok
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Copyright (c) 2009 Shrikar Archak
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Copyright (c) 2003-2011 Stony Brook University
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (c) 2003-2011 The Research Foundation of SUNY
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * This file is dual licensed. It may be redistributed and/or modified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * under the terms of the Apache 2.0 License OR version 2 of the GNU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * General Public License.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include "sdcardfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) /* copy derived state from parent inode */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static void inherit_derived_state(struct inode *parent, struct inode *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) struct sdcardfs_inode_info *pi = SDCARDFS_I(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct sdcardfs_inode_info *ci = SDCARDFS_I(child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) ci->data->perm = PERM_INHERIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) ci->data->userid = pi->data->userid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) ci->data->d_uid = pi->data->d_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) ci->data->under_android = pi->data->under_android;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) ci->data->under_cache = pi->data->under_cache;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) ci->data->under_obb = pi->data->under_obb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) /* helper function for derived state */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) void setup_derived_state(struct inode *inode, perm_t perm, userid_t userid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) uid_t uid)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) struct sdcardfs_inode_info *info = SDCARDFS_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) info->data->perm = perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) info->data->userid = userid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) info->data->d_uid = uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) info->data->under_android = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) info->data->under_cache = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) info->data->under_obb = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) /* While renaming, there is a point where we want the path from dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * but the name from newdentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) void get_derived_permission_new(struct dentry *parent, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) const struct qstr *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct sdcardfs_inode_info *info = SDCARDFS_I(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct sdcardfs_inode_info *parent_info = SDCARDFS_I(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct sdcardfs_inode_data *parent_data = parent_info->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) appid_t appid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) unsigned long user_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) struct qstr q_Android = QSTR_LITERAL("Android");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct qstr q_data = QSTR_LITERAL("data");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct qstr q_sandbox = QSTR_LITERAL("sandbox");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) struct qstr q_obb = QSTR_LITERAL("obb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) struct qstr q_media = QSTR_LITERAL("media");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) struct qstr q_cache = QSTR_LITERAL("cache");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) /* By default, each inode inherits from its parent.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) * the properties are maintained on its private fields
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) * because the inode attributes will be modified with that of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) * its lower inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * These values are used by our custom permission call instead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * of using the inode permissions.
^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) inherit_derived_state(d_inode(parent), d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) /* Files don't get special labels */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) if (!S_ISDIR(d_inode(dentry)->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) set_top(info, parent_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /* Derive custom permissions based on parent and current node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) switch (parent_data->perm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) case PERM_INHERIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) case PERM_ANDROID_PACKAGE_CACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) set_top(info, parent_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) case PERM_PRE_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Legacy internal layout places users at top level */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) info->data->perm = PERM_ROOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) err = kstrtoul(name->name, 10, &user_num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) info->data->userid = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) info->data->userid = user_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) case PERM_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* Assume masked off by default. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (qstr_case_eq(name, &q_Android)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) /* App-specific directories inside; let anyone traverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) info->data->perm = PERM_ANDROID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) info->data->under_android = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) set_top(info, parent_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) case PERM_ANDROID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (qstr_case_eq(name, &q_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) /* App-specific directories inside; let anyone traverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) info->data->perm = PERM_ANDROID_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) } else if (qstr_case_eq(name, &q_sandbox)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) /* App-specific directories inside; let anyone traverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) info->data->perm = PERM_ANDROID_DATA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) } else if (qstr_case_eq(name, &q_obb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) /* App-specific directories inside; let anyone traverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) info->data->perm = PERM_ANDROID_OBB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) info->data->under_obb = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) /* Single OBB directory is always shared */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) } else if (qstr_case_eq(name, &q_media)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) /* App-specific directories inside; let anyone traverse */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) info->data->perm = PERM_ANDROID_MEDIA;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) set_top(info, parent_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) case PERM_ANDROID_OBB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) case PERM_ANDROID_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) case PERM_ANDROID_MEDIA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) info->data->perm = PERM_ANDROID_PACKAGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) appid = get_appid(name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (appid != 0 && !is_excluded(name->name, parent_data->userid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) info->data->d_uid =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) multiuser_get_uid(parent_data->userid, appid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) case PERM_ANDROID_PACKAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) if (qstr_case_eq(name, &q_cache)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) info->data->perm = PERM_ANDROID_PACKAGE_CACHE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) info->data->under_cache = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) set_top(info, parent_info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) void get_derived_permission(struct dentry *parent, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) get_derived_permission_new(parent, dentry, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) static appid_t get_type(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) const char *ext = strrchr(name, '.');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) appid_t id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (ext && ext[0]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) ext = &ext[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) id = get_ext_gid(ext);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return id?:AID_MEDIA_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return AID_MEDIA_RW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) void fixup_lower_ownership(struct dentry *dentry, const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) struct path path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct inode *delegated_inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct sdcardfs_inode_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) struct sdcardfs_inode_data *info_d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) struct sdcardfs_inode_data *info_top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) perm_t perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) uid_t uid = sbi->options.fs_low_uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) gid_t gid = sbi->options.fs_low_gid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct iattr newattrs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) if (!sbi->options.gid_derivation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) info = SDCARDFS_I(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) info_d = info->data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) perm = info_d->perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) if (info_d->under_obb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) perm = PERM_ANDROID_OBB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) } else if (info_d->under_cache) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) perm = PERM_ANDROID_PACKAGE_CACHE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) } else if (perm == PERM_INHERIT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) info_top = top_data_get(info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) perm = info_top->perm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) data_put(info_top);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) switch (perm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) case PERM_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) case PERM_ANDROID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) case PERM_ANDROID_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) case PERM_ANDROID_MEDIA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) case PERM_ANDROID_PACKAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) case PERM_ANDROID_PACKAGE_CACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) uid = multiuser_get_uid(info_d->userid, uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) case PERM_ANDROID_OBB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) uid = AID_MEDIA_OBB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) case PERM_PRE_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) switch (perm) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) case PERM_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) case PERM_ANDROID:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) case PERM_ANDROID_DATA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) case PERM_ANDROID_MEDIA:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) if (S_ISDIR(d_inode(dentry)->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) gid = multiuser_get_uid(info_d->userid, AID_MEDIA_RW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) gid = multiuser_get_uid(info_d->userid, get_type(name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) case PERM_ANDROID_OBB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) gid = AID_MEDIA_OBB;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) case PERM_ANDROID_PACKAGE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) if (uid_is_app(info_d->d_uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) gid = multiuser_get_ext_gid(info_d->d_uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) gid = multiuser_get_uid(info_d->userid, AID_MEDIA_RW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) case PERM_ANDROID_PACKAGE_CACHE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) if (uid_is_app(info_d->d_uid))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) gid = multiuser_get_ext_cache_gid(info_d->d_uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) gid = multiuser_get_uid(info_d->userid, AID_MEDIA_RW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) case PERM_PRE_ROOT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) sdcardfs_get_lower_path(dentry, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) inode = d_inode(path.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) if (d_inode(path.dentry)->i_gid.val != gid || d_inode(path.dentry)->i_uid.val != uid) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) retry_deleg:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) newattrs.ia_valid = ATTR_GID | ATTR_UID | ATTR_FORCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) newattrs.ia_uid = make_kuid(current_user_ns(), uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) newattrs.ia_gid = make_kgid(current_user_ns(), gid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (!S_ISDIR(inode->i_mode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) newattrs.ia_valid |=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) inode_lock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) error = security_path_chown(&path, newattrs.ia_uid, newattrs.ia_gid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) error = notify_change2(path.mnt, path.dentry, &newattrs, &delegated_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) inode_unlock(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) if (delegated_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) error = break_deleg_wait(&delegated_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (!error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) goto retry_deleg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) pr_debug("sdcardfs: Failed to touch up lower fs gid/uid for %s\n", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) sdcardfs_put_lower_path(dentry, &path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static int descendant_may_need_fixup(struct sdcardfs_inode_data *data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) struct limit_search *limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (data->perm == PERM_ROOT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) return (limit->flags & BY_USERID) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) data->userid == limit->userid : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) if (data->perm == PERM_PRE_ROOT || data->perm == PERM_ANDROID)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) static int needs_fixup(perm_t perm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) if (perm == PERM_ANDROID_DATA || perm == PERM_ANDROID_OBB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) || perm == PERM_ANDROID_MEDIA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) return 0;
^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) static void __fixup_perms_recursive(struct dentry *dentry, struct limit_search *limit, int depth)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) struct dentry *child;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct sdcardfs_inode_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) * All paths will terminate their recursion on hitting PERM_ANDROID_OBB,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) * PERM_ANDROID_MEDIA, or PERM_ANDROID_DATA. This happens at a depth of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) * at most 3.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) WARN(depth > 3, "%s: Max expected depth exceeded!\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) spin_lock_nested(&dentry->d_lock, depth);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) if (!d_inode(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) spin_unlock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) info = SDCARDFS_I(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) if (needs_fixup(info->data->perm)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) list_for_each_entry(child, &dentry->d_subdirs, d_child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) spin_lock_nested(&child->d_lock, depth + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) if (!(limit->flags & BY_NAME) || qstr_case_eq(&child->d_name, &limit->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) if (d_inode(child)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) get_derived_permission(dentry, child);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) fixup_tmp_permissions(d_inode(child));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) spin_unlock(&child->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) spin_unlock(&child->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) } else if (descendant_may_need_fixup(info->data, limit)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) list_for_each_entry(child, &dentry->d_subdirs, d_child) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) __fixup_perms_recursive(child, limit, depth + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) spin_unlock(&dentry->d_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) void fixup_perms_recursive(struct dentry *dentry, struct limit_search *limit)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) __fixup_perms_recursive(dentry, limit, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) /* main function for updating derived permission */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) inline void update_derived_permission_lock(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) struct dentry *parent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) if (!dentry || !d_inode(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) pr_err("sdcardfs: %s: invalid dentry\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) /* FIXME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * 1. need to check whether the dentry is updated or not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) * 2. remove the root dentry update
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) if (!IS_ROOT(dentry)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) parent = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) if (parent) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) get_derived_permission(parent, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) dput(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) fixup_tmp_permissions(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) int need_graft_path(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) struct dentry *parent = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) struct sdcardfs_inode_info *parent_info = SDCARDFS_I(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) struct qstr obb = QSTR_LITERAL("obb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (!sbi->options.unshared_obb &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) parent_info->data->perm == PERM_ANDROID &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) qstr_case_eq(&dentry->d_name, &obb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) /* /Android/obb is the base obbpath of DERIVED_UNIFIED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) if (!(sbi->options.multiuser == false
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) && parent_info->data->userid == 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) ret = 1;
^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) dput(parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) int is_obbpath_invalid(struct dentry *dent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) struct sdcardfs_dentry_info *di = SDCARDFS_D(dent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dent->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) char *path_buf, *obbpath_s;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) int need_put = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) struct path lower_path;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) /* check the base obbpath has been changed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) * this routine can check an uninitialized obb dentry as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) * regarding the uninitialized obb, refer to the sdcardfs_mkdir()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) spin_lock(&di->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) if (di->orig_path.dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) if (!di->lower_path.dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) path_get(&di->lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) path_buf = kmalloc(PATH_MAX, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) if (!path_buf) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) pr_err("sdcardfs: fail to allocate path_buf in %s.\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) obbpath_s = d_path(&di->lower_path, path_buf, PATH_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) if (d_unhashed(di->lower_path.dentry) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) !str_case_eq(sbi->obbpath_s, obbpath_s)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) kfree(path_buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) pathcpy(&lower_path, &di->lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) need_put = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) spin_unlock(&di->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) if (need_put)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) path_put(&lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) int is_base_obbpath(struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) struct dentry *parent = dget_parent(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) struct sdcardfs_inode_info *parent_info = SDCARDFS_I(d_inode(parent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) struct qstr q_obb = QSTR_LITERAL("obb");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) spin_lock(&SDCARDFS_D(dentry)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (sbi->options.multiuser) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) if (parent_info->data->perm == PERM_PRE_ROOT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) qstr_case_eq(&dentry->d_name, &q_obb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) } else if (parent_info->data->perm == PERM_ANDROID &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) qstr_case_eq(&dentry->d_name, &q_obb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) spin_unlock(&SDCARDFS_D(dentry)->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) /* The lower_path will be stored to the dentry's orig_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) * and the base obbpath will be copyed to the lower_path variable.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) * if an error returned, there's no change in the lower_path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) * returns: -ERRNO if error (0: no error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) int setup_obb_dentry(struct dentry *dentry, struct path *lower_path)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) struct sdcardfs_sb_info *sbi = SDCARDFS_SB(dentry->d_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) struct path obbpath;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) /* A local obb dentry must have its own orig_path to support rmdir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) * and mkdir of itself. Usually, we expect that the sbi->obbpath
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) * is avaiable on this stage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) sdcardfs_set_orig_path(dentry, lower_path);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) err = kern_path(sbi->obbpath_s,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &obbpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) /* the obbpath base has been found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) pathcpy(lower_path, &obbpath);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) /* if the sbi->obbpath is not available, we can optionally
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) * setup the lower_path with its orig_path.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) * but, the current implementation just returns an error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) * because the sdcard daemon also regards this case as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) * a lookup fail.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) pr_info("sdcardfs: the sbi->obbpath is not available\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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