1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4c00c310eSDavid Woodhouse * Copyright © 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11c00c310eSDavid Woodhouse 125a528957SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 135a528957SJoe Perches 14aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 15aa98d7cfSKaiGai Kohei #include <linux/slab.h> 16aa98d7cfSKaiGai Kohei #include <linux/fs.h> 17914e2637SAl Viro #include <linux/sched.h> 18aa98d7cfSKaiGai Kohei #include <linux/time.h> 19aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 20aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 21aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 22aa98d7cfSKaiGai Kohei #include <linux/posix_acl_xattr.h> 23aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 24aa98d7cfSKaiGai Kohei #include "nodelist.h" 25aa98d7cfSKaiGai Kohei 26aa98d7cfSKaiGai Kohei static size_t jffs2_acl_size(int count) 27aa98d7cfSKaiGai Kohei { 28aa98d7cfSKaiGai Kohei if (count <= 4) { 29de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 30de1f72faSKaiGai Kohei + count * sizeof(struct jffs2_acl_entry_short); 31aa98d7cfSKaiGai Kohei } else { 32de1f72faSKaiGai Kohei return sizeof(struct jffs2_acl_header) 33de1f72faSKaiGai Kohei + 4 * sizeof(struct jffs2_acl_entry_short) 34de1f72faSKaiGai Kohei + (count - 4) * sizeof(struct jffs2_acl_entry); 35aa98d7cfSKaiGai Kohei } 36aa98d7cfSKaiGai Kohei } 37aa98d7cfSKaiGai Kohei 38aa98d7cfSKaiGai Kohei static int jffs2_acl_count(size_t size) 39aa98d7cfSKaiGai Kohei { 40aa98d7cfSKaiGai Kohei size_t s; 41aa98d7cfSKaiGai Kohei 42de1f72faSKaiGai Kohei size -= sizeof(struct jffs2_acl_header); 43fc371a25SRoel Kluin if (size < 4 * sizeof(struct jffs2_acl_entry_short)) { 44de1f72faSKaiGai Kohei if (size % sizeof(struct jffs2_acl_entry_short)) 45aa98d7cfSKaiGai Kohei return -1; 46de1f72faSKaiGai Kohei return size / sizeof(struct jffs2_acl_entry_short); 47aa98d7cfSKaiGai Kohei } else { 48fc371a25SRoel Kluin s = size - 4 * sizeof(struct jffs2_acl_entry_short); 49de1f72faSKaiGai Kohei if (s % sizeof(struct jffs2_acl_entry)) 50aa98d7cfSKaiGai Kohei return -1; 51de1f72faSKaiGai Kohei return s / sizeof(struct jffs2_acl_entry) + 4; 52aa98d7cfSKaiGai Kohei } 53aa98d7cfSKaiGai Kohei } 54aa98d7cfSKaiGai Kohei 55dea80134SKaiGai Kohei static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size) 56aa98d7cfSKaiGai Kohei { 57dea80134SKaiGai Kohei void *end = value + size; 58dea80134SKaiGai Kohei struct jffs2_acl_header *header = value; 59dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 60aa98d7cfSKaiGai Kohei struct posix_acl *acl; 61aa98d7cfSKaiGai Kohei uint32_t ver; 62aa98d7cfSKaiGai Kohei int i, count; 63aa98d7cfSKaiGai Kohei 64aa98d7cfSKaiGai Kohei if (!value) 65aa98d7cfSKaiGai Kohei return NULL; 66de1f72faSKaiGai Kohei if (size < sizeof(struct jffs2_acl_header)) 67aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 68dea80134SKaiGai Kohei ver = je32_to_cpu(header->a_version); 69aa98d7cfSKaiGai Kohei if (ver != JFFS2_ACL_VERSION) { 70aa98d7cfSKaiGai Kohei JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver); 71aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 72aa98d7cfSKaiGai Kohei } 73aa98d7cfSKaiGai Kohei 74dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_header); 75aa98d7cfSKaiGai Kohei count = jffs2_acl_count(size); 76aa98d7cfSKaiGai Kohei if (count < 0) 77aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 78aa98d7cfSKaiGai Kohei if (count == 0) 79aa98d7cfSKaiGai Kohei return NULL; 80aa98d7cfSKaiGai Kohei 81aa98d7cfSKaiGai Kohei acl = posix_acl_alloc(count, GFP_KERNEL); 82aa98d7cfSKaiGai Kohei if (!acl) 83aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 84aa98d7cfSKaiGai Kohei 85aa98d7cfSKaiGai Kohei for (i=0; i < count; i++) { 86dea80134SKaiGai Kohei entry = value; 87dea80134SKaiGai Kohei if (value + sizeof(struct jffs2_acl_entry_short) > end) 88aa98d7cfSKaiGai Kohei goto fail; 89aa98d7cfSKaiGai Kohei acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag); 90aa98d7cfSKaiGai Kohei acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm); 91aa98d7cfSKaiGai Kohei switch (acl->a_entries[i].e_tag) { 92aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 93aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 94aa98d7cfSKaiGai Kohei case ACL_MASK: 95aa98d7cfSKaiGai Kohei case ACL_OTHER: 96dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry_short); 97aa98d7cfSKaiGai Kohei break; 98aa98d7cfSKaiGai Kohei 99aa98d7cfSKaiGai Kohei case ACL_USER: 1000cfe53d3SEric W. Biederman value += sizeof(struct jffs2_acl_entry); 1010cfe53d3SEric W. Biederman if (value > end) 1020cfe53d3SEric W. Biederman goto fail; 1030cfe53d3SEric W. Biederman acl->a_entries[i].e_uid = 1040cfe53d3SEric W. Biederman make_kuid(&init_user_ns, 1050cfe53d3SEric W. Biederman je32_to_cpu(entry->e_id)); 1060cfe53d3SEric W. Biederman break; 107aa98d7cfSKaiGai Kohei case ACL_GROUP: 108dea80134SKaiGai Kohei value += sizeof(struct jffs2_acl_entry); 109dea80134SKaiGai Kohei if (value > end) 110aa98d7cfSKaiGai Kohei goto fail; 1110cfe53d3SEric W. Biederman acl->a_entries[i].e_gid = 1120cfe53d3SEric W. Biederman make_kgid(&init_user_ns, 1130cfe53d3SEric W. Biederman je32_to_cpu(entry->e_id)); 114aa98d7cfSKaiGai Kohei break; 115aa98d7cfSKaiGai Kohei 116aa98d7cfSKaiGai Kohei default: 117aa98d7cfSKaiGai Kohei goto fail; 118aa98d7cfSKaiGai Kohei } 119aa98d7cfSKaiGai Kohei } 120aa98d7cfSKaiGai Kohei if (value != end) 121aa98d7cfSKaiGai Kohei goto fail; 122aa98d7cfSKaiGai Kohei return acl; 123aa98d7cfSKaiGai Kohei fail: 124aa98d7cfSKaiGai Kohei posix_acl_release(acl); 125aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 126aa98d7cfSKaiGai Kohei } 127aa98d7cfSKaiGai Kohei 128aa98d7cfSKaiGai Kohei static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size) 129aa98d7cfSKaiGai Kohei { 130dea80134SKaiGai Kohei struct jffs2_acl_header *header; 131dea80134SKaiGai Kohei struct jffs2_acl_entry *entry; 132dea80134SKaiGai Kohei void *e; 133aa98d7cfSKaiGai Kohei size_t i; 134aa98d7cfSKaiGai Kohei 135aa98d7cfSKaiGai Kohei *size = jffs2_acl_size(acl->a_count); 136a3ac9730SMatthew Wilcox header = kmalloc(struct_size(header, a_entries, acl->a_count), 137a3ac9730SMatthew Wilcox GFP_KERNEL); 138dea80134SKaiGai Kohei if (!header) 139aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 140dea80134SKaiGai Kohei header->a_version = cpu_to_je32(JFFS2_ACL_VERSION); 141dea80134SKaiGai Kohei e = header + 1; 142aa98d7cfSKaiGai Kohei for (i=0; i < acl->a_count; i++) { 1430cfe53d3SEric W. Biederman const struct posix_acl_entry *acl_e = &acl->a_entries[i]; 144dea80134SKaiGai Kohei entry = e; 1450cfe53d3SEric W. Biederman entry->e_tag = cpu_to_je16(acl_e->e_tag); 1460cfe53d3SEric W. Biederman entry->e_perm = cpu_to_je16(acl_e->e_perm); 1470cfe53d3SEric W. Biederman switch(acl_e->e_tag) { 148aa98d7cfSKaiGai Kohei case ACL_USER: 1490cfe53d3SEric W. Biederman entry->e_id = cpu_to_je32( 1500cfe53d3SEric W. Biederman from_kuid(&init_user_ns, acl_e->e_uid)); 1510cfe53d3SEric W. Biederman e += sizeof(struct jffs2_acl_entry); 1520cfe53d3SEric W. Biederman break; 153aa98d7cfSKaiGai Kohei case ACL_GROUP: 1540cfe53d3SEric W. Biederman entry->e_id = cpu_to_je32( 1550cfe53d3SEric W. Biederman from_kgid(&init_user_ns, acl_e->e_gid)); 156de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry); 157aa98d7cfSKaiGai Kohei break; 158aa98d7cfSKaiGai Kohei 159aa98d7cfSKaiGai Kohei case ACL_USER_OBJ: 160aa98d7cfSKaiGai Kohei case ACL_GROUP_OBJ: 161aa98d7cfSKaiGai Kohei case ACL_MASK: 162aa98d7cfSKaiGai Kohei case ACL_OTHER: 163de1f72faSKaiGai Kohei e += sizeof(struct jffs2_acl_entry_short); 164aa98d7cfSKaiGai Kohei break; 165aa98d7cfSKaiGai Kohei 166aa98d7cfSKaiGai Kohei default: 167aa98d7cfSKaiGai Kohei goto fail; 168aa98d7cfSKaiGai Kohei } 169aa98d7cfSKaiGai Kohei } 170dea80134SKaiGai Kohei return header; 171aa98d7cfSKaiGai Kohei fail: 172dea80134SKaiGai Kohei kfree(header); 173aa98d7cfSKaiGai Kohei return ERR_PTR(-EINVAL); 174aa98d7cfSKaiGai Kohei } 175aa98d7cfSKaiGai Kohei 1764e34e719SChristoph Hellwig struct posix_acl *jffs2_get_acl(struct inode *inode, int type) 177aa98d7cfSKaiGai Kohei { 178aa98d7cfSKaiGai Kohei struct posix_acl *acl; 179aa98d7cfSKaiGai Kohei char *value = NULL; 180aa98d7cfSKaiGai Kohei int rc, xprefix; 181aa98d7cfSKaiGai Kohei 182073aaa1bSAl Viro switch (type) { 183073aaa1bSAl Viro case ACL_TYPE_ACCESS: 184aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 185aa98d7cfSKaiGai Kohei break; 186aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 187aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 188aa98d7cfSKaiGai Kohei break; 189aa98d7cfSKaiGai Kohei default: 190073aaa1bSAl Viro BUG(); 191aa98d7cfSKaiGai Kohei } 192aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0); 193aa98d7cfSKaiGai Kohei if (rc > 0) { 194aa98d7cfSKaiGai Kohei value = kmalloc(rc, GFP_KERNEL); 195aa98d7cfSKaiGai Kohei if (!value) 196aa98d7cfSKaiGai Kohei return ERR_PTR(-ENOMEM); 197aa98d7cfSKaiGai Kohei rc = do_jffs2_getxattr(inode, xprefix, "", value, rc); 198aa98d7cfSKaiGai Kohei } 199aa98d7cfSKaiGai Kohei if (rc > 0) { 200aa98d7cfSKaiGai Kohei acl = jffs2_acl_from_medium(value, rc); 201aa98d7cfSKaiGai Kohei } else if (rc == -ENODATA || rc == -ENOSYS) { 202aa98d7cfSKaiGai Kohei acl = NULL; 203aa98d7cfSKaiGai Kohei } else { 204aa98d7cfSKaiGai Kohei acl = ERR_PTR(rc); 205aa98d7cfSKaiGai Kohei } 206aa98d7cfSKaiGai Kohei kfree(value); 207aa98d7cfSKaiGai Kohei return acl; 208aa98d7cfSKaiGai Kohei } 209aa98d7cfSKaiGai Kohei 210cfc8dc6fSKaiGai Kohei static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl) 211cfc8dc6fSKaiGai Kohei { 212cfc8dc6fSKaiGai Kohei char *value = NULL; 213cfc8dc6fSKaiGai Kohei size_t size = 0; 214cfc8dc6fSKaiGai Kohei int rc; 215cfc8dc6fSKaiGai Kohei 216cfc8dc6fSKaiGai Kohei if (acl) { 217cfc8dc6fSKaiGai Kohei value = jffs2_acl_to_medium(acl, &size); 218cfc8dc6fSKaiGai Kohei if (IS_ERR(value)) 219cfc8dc6fSKaiGai Kohei return PTR_ERR(value); 220cfc8dc6fSKaiGai Kohei } 221cfc8dc6fSKaiGai Kohei rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0); 222cfc8dc6fSKaiGai Kohei if (!value && rc == -ENODATA) 223cfc8dc6fSKaiGai Kohei rc = 0; 224cfc8dc6fSKaiGai Kohei kfree(value); 225cfc8dc6fSKaiGai Kohei 226cfc8dc6fSKaiGai Kohei return rc; 227cfc8dc6fSKaiGai Kohei } 228cfc8dc6fSKaiGai Kohei 229f2963d45SChristoph Hellwig int jffs2_set_acl(struct inode *inode, struct posix_acl *acl, int type) 230aa98d7cfSKaiGai Kohei { 231aa98d7cfSKaiGai Kohei int rc, xprefix; 232aa98d7cfSKaiGai Kohei 233aa98d7cfSKaiGai Kohei switch (type) { 234aa98d7cfSKaiGai Kohei case ACL_TYPE_ACCESS: 235aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_ACCESS; 236aa98d7cfSKaiGai Kohei if (acl) { 23707393101SJan Kara umode_t mode; 23807393101SJan Kara 23907393101SJan Kara rc = posix_acl_update_mode(inode, &mode, &acl); 24007393101SJan Kara if (rc) 241aa98d7cfSKaiGai Kohei return rc; 242aa98d7cfSKaiGai Kohei if (inode->i_mode != mode) { 2439ed437c5SDavid Woodhouse struct iattr attr; 2449ed437c5SDavid Woodhouse 2451c24d06fSJan Kara attr.ia_valid = ATTR_MODE | ATTR_CTIME; 2469ed437c5SDavid Woodhouse attr.ia_mode = mode; 24702027d42SDeepa Dinamani attr.ia_ctime = current_time(inode); 2489ed437c5SDavid Woodhouse rc = jffs2_do_setattr(inode, &attr); 2499ed437c5SDavid Woodhouse if (rc < 0) 2509ed437c5SDavid Woodhouse return rc; 251aa98d7cfSKaiGai Kohei } 252aa98d7cfSKaiGai Kohei } 253aa98d7cfSKaiGai Kohei break; 254aa98d7cfSKaiGai Kohei case ACL_TYPE_DEFAULT: 255aa98d7cfSKaiGai Kohei xprefix = JFFS2_XPREFIX_ACL_DEFAULT; 256aa98d7cfSKaiGai Kohei if (!S_ISDIR(inode->i_mode)) 257aa98d7cfSKaiGai Kohei return acl ? -EACCES : 0; 258aa98d7cfSKaiGai Kohei break; 259aa98d7cfSKaiGai Kohei default: 260aa98d7cfSKaiGai Kohei return -EINVAL; 261aa98d7cfSKaiGai Kohei } 262cfc8dc6fSKaiGai Kohei rc = __jffs2_set_acl(inode, xprefix, acl); 263073aaa1bSAl Viro if (!rc) 264073aaa1bSAl Viro set_cached_acl(inode, type, acl); 265aa98d7cfSKaiGai Kohei return rc; 266aa98d7cfSKaiGai Kohei } 267aa98d7cfSKaiGai Kohei 268d3fb6120SAl Viro int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode) 269aa98d7cfSKaiGai Kohei { 270f2963d45SChristoph Hellwig struct posix_acl *default_acl, *acl; 271cfc8dc6fSKaiGai Kohei int rc; 272aa98d7cfSKaiGai Kohei 27372c04902SAl Viro cache_no_acl(inode); 2749ed437c5SDavid Woodhouse 275f2963d45SChristoph Hellwig rc = posix_acl_create(dir_i, i_mode, &default_acl, &acl); 276f2963d45SChristoph Hellwig if (rc) 277cfc8dc6fSKaiGai Kohei return rc; 278cfc8dc6fSKaiGai Kohei 279f2963d45SChristoph Hellwig if (default_acl) { 280f2963d45SChristoph Hellwig set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl); 281f2963d45SChristoph Hellwig posix_acl_release(default_acl); 282f2963d45SChristoph Hellwig } 283f2963d45SChristoph Hellwig if (acl) { 284f2963d45SChristoph Hellwig set_cached_acl(inode, ACL_TYPE_ACCESS, acl); 285826cae2fSAl Viro posix_acl_release(acl); 286aa98d7cfSKaiGai Kohei } 287cfc8dc6fSKaiGai Kohei return 0; 288cfc8dc6fSKaiGai Kohei } 289cfc8dc6fSKaiGai Kohei 290cfc8dc6fSKaiGai Kohei int jffs2_init_acl_post(struct inode *inode) 291cfc8dc6fSKaiGai Kohei { 292cfc8dc6fSKaiGai Kohei int rc; 293cfc8dc6fSKaiGai Kohei 294290c263bSAl Viro if (inode->i_default_acl) { 295290c263bSAl Viro rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl); 296cfc8dc6fSKaiGai Kohei if (rc) 297cfc8dc6fSKaiGai Kohei return rc; 298cfc8dc6fSKaiGai Kohei } 299cfc8dc6fSKaiGai Kohei 300290c263bSAl Viro if (inode->i_acl) { 301290c263bSAl Viro rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl); 302cfc8dc6fSKaiGai Kohei if (rc) 303cfc8dc6fSKaiGai Kohei return rc; 304cfc8dc6fSKaiGai Kohei } 305cfc8dc6fSKaiGai Kohei 3068d6ea587SDavid Woodhouse return 0; 307aa98d7cfSKaiGai Kohei } 308