1b3b94faaSDavid Teigland /* 2b3b94faaSDavid Teigland * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. 3b3b94faaSDavid Teigland * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. 4b3b94faaSDavid Teigland * 5b3b94faaSDavid Teigland * This copyrighted material is made available to anyone wishing to use, 6b3b94faaSDavid Teigland * modify, copy, or redistribute it subject to the terms and conditions 7b3b94faaSDavid Teigland * of the GNU General Public License v.2. 8b3b94faaSDavid Teigland */ 9b3b94faaSDavid Teigland 10b3b94faaSDavid Teigland #include <linux/sched.h> 11b3b94faaSDavid Teigland #include <linux/slab.h> 12b3b94faaSDavid Teigland #include <linux/spinlock.h> 13b3b94faaSDavid Teigland #include <linux/completion.h> 14b3b94faaSDavid Teigland #include <linux/buffer_head.h> 15b3b94faaSDavid Teigland #include <linux/posix_acl.h> 16b3b94faaSDavid Teigland #include <linux/posix_acl_xattr.h> 17b3b94faaSDavid Teigland #include <asm/semaphore.h> 18b3b94faaSDavid Teigland 19b3b94faaSDavid Teigland #include "gfs2.h" 20b3b94faaSDavid Teigland #include "acl.h" 21b3b94faaSDavid Teigland #include "eaops.h" 22b3b94faaSDavid Teigland #include "eattr.h" 23b3b94faaSDavid Teigland #include "glock.h" 24b3b94faaSDavid Teigland #include "inode.h" 25b3b94faaSDavid Teigland #include "meta_io.h" 26b3b94faaSDavid Teigland #include "trans.h" 27b3b94faaSDavid Teigland 28b3b94faaSDavid Teigland #define ACL_ACCESS 1 29b3b94faaSDavid Teigland #define ACL_DEFAULT 0 30b3b94faaSDavid Teigland 31b3b94faaSDavid Teigland int gfs2_acl_validate_set(struct gfs2_inode *ip, int access, 32b3b94faaSDavid Teigland struct gfs2_ea_request *er, 33b3b94faaSDavid Teigland int *remove, mode_t *mode) 34b3b94faaSDavid Teigland { 35b3b94faaSDavid Teigland struct posix_acl *acl; 36b3b94faaSDavid Teigland int error; 37b3b94faaSDavid Teigland 38b3b94faaSDavid Teigland error = gfs2_acl_validate_remove(ip, access); 39b3b94faaSDavid Teigland if (error) 40b3b94faaSDavid Teigland return error; 41b3b94faaSDavid Teigland 42b3b94faaSDavid Teigland if (!er->er_data) 43b3b94faaSDavid Teigland return -EINVAL; 44b3b94faaSDavid Teigland 45b3b94faaSDavid Teigland acl = posix_acl_from_xattr(er->er_data, er->er_data_len); 46b3b94faaSDavid Teigland if (IS_ERR(acl)) 47b3b94faaSDavid Teigland return PTR_ERR(acl); 48b3b94faaSDavid Teigland if (!acl) { 49b3b94faaSDavid Teigland *remove = 1; 50b3b94faaSDavid Teigland return 0; 51b3b94faaSDavid Teigland } 52b3b94faaSDavid Teigland 53b3b94faaSDavid Teigland error = posix_acl_valid(acl); 54b3b94faaSDavid Teigland if (error) 55b3b94faaSDavid Teigland goto out; 56b3b94faaSDavid Teigland 57b3b94faaSDavid Teigland if (access) { 58b3b94faaSDavid Teigland error = posix_acl_equiv_mode(acl, mode); 59b3b94faaSDavid Teigland if (!error) 60b3b94faaSDavid Teigland *remove = 1; 61b3b94faaSDavid Teigland else if (error > 0) 62b3b94faaSDavid Teigland error = 0; 63b3b94faaSDavid Teigland } 64b3b94faaSDavid Teigland 65b3b94faaSDavid Teigland out: 66b3b94faaSDavid Teigland posix_acl_release(acl); 67b3b94faaSDavid Teigland 68b3b94faaSDavid Teigland return error; 69b3b94faaSDavid Teigland } 70b3b94faaSDavid Teigland 71b3b94faaSDavid Teigland int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access) 72b3b94faaSDavid Teigland { 73b3b94faaSDavid Teigland if (!ip->i_sbd->sd_args.ar_posix_acl) 74b3b94faaSDavid Teigland return -EOPNOTSUPP; 75b3b94faaSDavid Teigland if (current->fsuid != ip->i_di.di_uid && !capable(CAP_FOWNER)) 76b3b94faaSDavid Teigland return -EPERM; 77b3b94faaSDavid Teigland if (S_ISLNK(ip->i_di.di_mode)) 78b3b94faaSDavid Teigland return -EOPNOTSUPP; 79b3b94faaSDavid Teigland if (!access && !S_ISDIR(ip->i_di.di_mode)) 80b3b94faaSDavid Teigland return -EACCES; 81b3b94faaSDavid Teigland 82b3b94faaSDavid Teigland return 0; 83b3b94faaSDavid Teigland } 84b3b94faaSDavid Teigland 85b3b94faaSDavid Teigland static int acl_get(struct gfs2_inode *ip, int access, struct posix_acl **acl, 86b3b94faaSDavid Teigland struct gfs2_ea_location *el, char **data, unsigned int *len) 87b3b94faaSDavid Teigland { 88b3b94faaSDavid Teigland struct gfs2_ea_request er; 89b3b94faaSDavid Teigland struct gfs2_ea_location el_this; 90b3b94faaSDavid Teigland int error; 91b3b94faaSDavid Teigland 92b3b94faaSDavid Teigland if (!ip->i_di.di_eattr) 93b3b94faaSDavid Teigland return 0; 94b3b94faaSDavid Teigland 95b3b94faaSDavid Teigland memset(&er, 0, sizeof(struct gfs2_ea_request)); 96b3b94faaSDavid Teigland if (access) { 97b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_ACCESS; 98b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN; 99b3b94faaSDavid Teigland } else { 100b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_DEFAULT; 101b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN; 102b3b94faaSDavid Teigland } 103b3b94faaSDavid Teigland er.er_type = GFS2_EATYPE_SYS; 104b3b94faaSDavid Teigland 105b3b94faaSDavid Teigland if (!el) 106b3b94faaSDavid Teigland el = &el_this; 107b3b94faaSDavid Teigland 108b3b94faaSDavid Teigland error = gfs2_ea_find(ip, &er, el); 109b3b94faaSDavid Teigland if (error) 110b3b94faaSDavid Teigland return error; 111b3b94faaSDavid Teigland if (!el->el_ea) 112b3b94faaSDavid Teigland return 0; 113b3b94faaSDavid Teigland if (!GFS2_EA_DATA_LEN(el->el_ea)) 114b3b94faaSDavid Teigland goto out; 115b3b94faaSDavid Teigland 116b3b94faaSDavid Teigland er.er_data_len = GFS2_EA_DATA_LEN(el->el_ea); 117b3b94faaSDavid Teigland er.er_data = kmalloc(er.er_data_len, GFP_KERNEL); 118b3b94faaSDavid Teigland error = -ENOMEM; 119b3b94faaSDavid Teigland if (!er.er_data) 120b3b94faaSDavid Teigland goto out; 121b3b94faaSDavid Teigland 122b3b94faaSDavid Teigland error = gfs2_ea_get_copy(ip, el, er.er_data); 123b3b94faaSDavid Teigland if (error) 124b3b94faaSDavid Teigland goto out_kfree; 125b3b94faaSDavid Teigland 126b3b94faaSDavid Teigland if (acl) { 127b3b94faaSDavid Teigland *acl = posix_acl_from_xattr(er.er_data, er.er_data_len); 128b3b94faaSDavid Teigland if (IS_ERR(*acl)) 129b3b94faaSDavid Teigland error = PTR_ERR(*acl); 130b3b94faaSDavid Teigland } 131b3b94faaSDavid Teigland 132b3b94faaSDavid Teigland out_kfree: 133b3b94faaSDavid Teigland if (error || !data) 134b3b94faaSDavid Teigland kfree(er.er_data); 135b3b94faaSDavid Teigland else { 136b3b94faaSDavid Teigland *data = er.er_data; 137b3b94faaSDavid Teigland *len = er.er_data_len; 138b3b94faaSDavid Teigland } 139b3b94faaSDavid Teigland 140b3b94faaSDavid Teigland out: 141b3b94faaSDavid Teigland if (error || el == &el_this) 142b3b94faaSDavid Teigland brelse(el->el_bh); 143b3b94faaSDavid Teigland 144b3b94faaSDavid Teigland return error; 145b3b94faaSDavid Teigland } 146b3b94faaSDavid Teigland 147b3b94faaSDavid Teigland /** 148b3b94faaSDavid Teigland * gfs2_check_acl_locked - Check an ACL to see if we're allowed to do something 149b3b94faaSDavid Teigland * @inode: the file we want to do something to 150b3b94faaSDavid Teigland * @mask: what we want to do 151b3b94faaSDavid Teigland * 152b3b94faaSDavid Teigland * Returns: errno 153b3b94faaSDavid Teigland */ 154b3b94faaSDavid Teigland 155b3b94faaSDavid Teigland int gfs2_check_acl_locked(struct inode *inode, int mask) 156b3b94faaSDavid Teigland { 157b3b94faaSDavid Teigland struct posix_acl *acl = NULL; 158b3b94faaSDavid Teigland int error; 159b3b94faaSDavid Teigland 160b3b94faaSDavid Teigland error = acl_get(get_v2ip(inode), ACL_ACCESS, &acl, NULL, NULL, NULL); 161b3b94faaSDavid Teigland if (error) 162b3b94faaSDavid Teigland return error; 163b3b94faaSDavid Teigland 164b3b94faaSDavid Teigland if (acl) { 165b3b94faaSDavid Teigland error = posix_acl_permission(inode, acl, mask); 166b3b94faaSDavid Teigland posix_acl_release(acl); 167b3b94faaSDavid Teigland return error; 168b3b94faaSDavid Teigland } 169b3b94faaSDavid Teigland 170b3b94faaSDavid Teigland return -EAGAIN; 171b3b94faaSDavid Teigland } 172b3b94faaSDavid Teigland 173b3b94faaSDavid Teigland int gfs2_check_acl(struct inode *inode, int mask) 174b3b94faaSDavid Teigland { 175b3b94faaSDavid Teigland struct gfs2_inode *ip = get_v2ip(inode); 176b3b94faaSDavid Teigland struct gfs2_holder i_gh; 177b3b94faaSDavid Teigland int error; 178b3b94faaSDavid Teigland 179b3b94faaSDavid Teigland error = gfs2_glock_nq_init(ip->i_gl, 180b3b94faaSDavid Teigland LM_ST_SHARED, LM_FLAG_ANY, 181b3b94faaSDavid Teigland &i_gh); 182b3b94faaSDavid Teigland if (!error) { 183b3b94faaSDavid Teigland error = gfs2_check_acl_locked(inode, mask); 184b3b94faaSDavid Teigland gfs2_glock_dq_uninit(&i_gh); 185b3b94faaSDavid Teigland } 186b3b94faaSDavid Teigland 187b3b94faaSDavid Teigland return error; 188b3b94faaSDavid Teigland } 189b3b94faaSDavid Teigland 190b3b94faaSDavid Teigland static int munge_mode(struct gfs2_inode *ip, mode_t mode) 191b3b94faaSDavid Teigland { 192b3b94faaSDavid Teigland struct gfs2_sbd *sdp = ip->i_sbd; 193b3b94faaSDavid Teigland struct buffer_head *dibh; 194b3b94faaSDavid Teigland int error; 195b3b94faaSDavid Teigland 196b3b94faaSDavid Teigland error = gfs2_trans_begin(sdp, RES_DINODE, 0); 197b3b94faaSDavid Teigland if (error) 198b3b94faaSDavid Teigland return error; 199b3b94faaSDavid Teigland 200b3b94faaSDavid Teigland error = gfs2_meta_inode_buffer(ip, &dibh); 201b3b94faaSDavid Teigland if (!error) { 202b3b94faaSDavid Teigland gfs2_assert_withdraw(sdp, 203b3b94faaSDavid Teigland (ip->i_di.di_mode & S_IFMT) == (mode & S_IFMT)); 204b3b94faaSDavid Teigland ip->i_di.di_mode = mode; 205b3b94faaSDavid Teigland gfs2_trans_add_bh(ip->i_gl, dibh); 206b3b94faaSDavid Teigland gfs2_dinode_out(&ip->i_di, dibh->b_data); 207b3b94faaSDavid Teigland brelse(dibh); 208b3b94faaSDavid Teigland } 209b3b94faaSDavid Teigland 210b3b94faaSDavid Teigland gfs2_trans_end(sdp); 211b3b94faaSDavid Teigland 212b3b94faaSDavid Teigland return 0; 213b3b94faaSDavid Teigland } 214b3b94faaSDavid Teigland 215b3b94faaSDavid Teigland int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip) 216b3b94faaSDavid Teigland { 217b3b94faaSDavid Teigland struct gfs2_sbd *sdp = dip->i_sbd; 218b3b94faaSDavid Teigland struct posix_acl *acl = NULL, *clone; 219b3b94faaSDavid Teigland struct gfs2_ea_request er; 220b3b94faaSDavid Teigland mode_t mode = ip->i_di.di_mode; 221b3b94faaSDavid Teigland int error; 222b3b94faaSDavid Teigland 223b3b94faaSDavid Teigland if (!sdp->sd_args.ar_posix_acl) 224b3b94faaSDavid Teigland return 0; 225b3b94faaSDavid Teigland if (S_ISLNK(ip->i_di.di_mode)) 226b3b94faaSDavid Teigland return 0; 227b3b94faaSDavid Teigland 228b3b94faaSDavid Teigland memset(&er, 0, sizeof(struct gfs2_ea_request)); 229b3b94faaSDavid Teigland er.er_type = GFS2_EATYPE_SYS; 230b3b94faaSDavid Teigland 231b3b94faaSDavid Teigland error = acl_get(dip, ACL_DEFAULT, &acl, NULL, 232b3b94faaSDavid Teigland &er.er_data, &er.er_data_len); 233b3b94faaSDavid Teigland if (error) 234b3b94faaSDavid Teigland return error; 235b3b94faaSDavid Teigland if (!acl) { 236b3b94faaSDavid Teigland mode &= ~current->fs->umask; 237b3b94faaSDavid Teigland if (mode != ip->i_di.di_mode) 238b3b94faaSDavid Teigland error = munge_mode(ip, mode); 239b3b94faaSDavid Teigland return error; 240b3b94faaSDavid Teigland } 241b3b94faaSDavid Teigland 242b3b94faaSDavid Teigland clone = posix_acl_clone(acl, GFP_KERNEL); 243b3b94faaSDavid Teigland error = -ENOMEM; 244b3b94faaSDavid Teigland if (!clone) 245b3b94faaSDavid Teigland goto out; 246b3b94faaSDavid Teigland posix_acl_release(acl); 247b3b94faaSDavid Teigland acl = clone; 248b3b94faaSDavid Teigland 249b3b94faaSDavid Teigland if (S_ISDIR(ip->i_di.di_mode)) { 250b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_DEFAULT; 251b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN; 252b3b94faaSDavid Teigland error = gfs2_system_eaops.eo_set(ip, &er); 253b3b94faaSDavid Teigland if (error) 254b3b94faaSDavid Teigland goto out; 255b3b94faaSDavid Teigland } 256b3b94faaSDavid Teigland 257b3b94faaSDavid Teigland error = posix_acl_create_masq(acl, &mode); 258b3b94faaSDavid Teigland if (error < 0) 259b3b94faaSDavid Teigland goto out; 260b3b94faaSDavid Teigland if (error > 0) { 261b3b94faaSDavid Teigland er.er_name = GFS2_POSIX_ACL_ACCESS; 262b3b94faaSDavid Teigland er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN; 263b3b94faaSDavid Teigland posix_acl_to_xattr(acl, er.er_data, er.er_data_len); 264b3b94faaSDavid Teigland er.er_mode = mode; 265b3b94faaSDavid Teigland er.er_flags = GFS2_ERF_MODE; 266b3b94faaSDavid Teigland error = gfs2_system_eaops.eo_set(ip, &er); 267b3b94faaSDavid Teigland if (error) 268b3b94faaSDavid Teigland goto out; 269b3b94faaSDavid Teigland } else 270b3b94faaSDavid Teigland munge_mode(ip, mode); 271b3b94faaSDavid Teigland 272b3b94faaSDavid Teigland out: 273b3b94faaSDavid Teigland posix_acl_release(acl); 274b3b94faaSDavid Teigland kfree(er.er_data); 275b3b94faaSDavid Teigland return error; 276b3b94faaSDavid Teigland } 277b3b94faaSDavid Teigland 278b3b94faaSDavid Teigland int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr) 279b3b94faaSDavid Teigland { 280b3b94faaSDavid Teigland struct posix_acl *acl = NULL, *clone; 281b3b94faaSDavid Teigland struct gfs2_ea_location el; 282b3b94faaSDavid Teigland char *data; 283b3b94faaSDavid Teigland unsigned int len; 284b3b94faaSDavid Teigland int error; 285b3b94faaSDavid Teigland 286b3b94faaSDavid Teigland error = acl_get(ip, ACL_ACCESS, &acl, &el, &data, &len); 287b3b94faaSDavid Teigland if (error) 288b3b94faaSDavid Teigland return error; 289b3b94faaSDavid Teigland if (!acl) 290b3b94faaSDavid Teigland return gfs2_setattr_simple(ip, attr); 291b3b94faaSDavid Teigland 292b3b94faaSDavid Teigland clone = posix_acl_clone(acl, GFP_KERNEL); 293b3b94faaSDavid Teigland error = -ENOMEM; 294b3b94faaSDavid Teigland if (!clone) 295b3b94faaSDavid Teigland goto out; 296b3b94faaSDavid Teigland posix_acl_release(acl); 297b3b94faaSDavid Teigland acl = clone; 298b3b94faaSDavid Teigland 299b3b94faaSDavid Teigland error = posix_acl_chmod_masq(acl, attr->ia_mode); 300b3b94faaSDavid Teigland if (!error) { 301b3b94faaSDavid Teigland posix_acl_to_xattr(acl, data, len); 302b3b94faaSDavid Teigland error = gfs2_ea_acl_chmod(ip, &el, attr, data); 303b3b94faaSDavid Teigland } 304b3b94faaSDavid Teigland 305b3b94faaSDavid Teigland out: 306b3b94faaSDavid Teigland posix_acl_release(acl); 307b3b94faaSDavid Teigland brelse(el.el_bh); 308b3b94faaSDavid Teigland kfree(data); 309b3b94faaSDavid Teigland 310b3b94faaSDavid Teigland return error; 311b3b94faaSDavid Teigland } 312b3b94faaSDavid Teigland 313