inode.c (f01387d2693813eb5271a3448e6a082322c7d75d) inode.c (f175ff8100eef0eb4b946c08e78a27bd17ca5896)
1/*
2 * Compressed rom filesystem for Linux.
3 *
4 * Copyright (C) 1999 Linus Torvalds.
5 *
6 * This file is released under the GPL.
7 */
8

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272 memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
273 mutex_unlock(&read_mutex);
274
275 /* Do sanity checks on the superblock */
276 if (super.magic != CRAMFS_MAGIC) {
277 /* check for wrong endianness */
278 if (super.magic == CRAMFS_MAGIC_WEND) {
279 if (!silent)
1/*
2 * Compressed rom filesystem for Linux.
3 *
4 * Copyright (C) 1999 Linus Torvalds.
5 *
6 * This file is released under the GPL.
7 */
8

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272 memcpy(&super, cramfs_read(sb, 0, sizeof(super)), sizeof(super));
273 mutex_unlock(&read_mutex);
274
275 /* Do sanity checks on the superblock */
276 if (super.magic != CRAMFS_MAGIC) {
277 /* check for wrong endianness */
278 if (super.magic == CRAMFS_MAGIC_WEND) {
279 if (!silent)
280 printk(KERN_ERR "cramfs: wrong endianness\n");
280 pr_err("cramfs: wrong endianness\n");
281 return -EINVAL;
282 }
283
284 /* check at 512 byte offset */
285 mutex_lock(&read_mutex);
286 memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
287 mutex_unlock(&read_mutex);
288 if (super.magic != CRAMFS_MAGIC) {
289 if (super.magic == CRAMFS_MAGIC_WEND && !silent)
281 return -EINVAL;
282 }
283
284 /* check at 512 byte offset */
285 mutex_lock(&read_mutex);
286 memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
287 mutex_unlock(&read_mutex);
288 if (super.magic != CRAMFS_MAGIC) {
289 if (super.magic == CRAMFS_MAGIC_WEND && !silent)
290 printk(KERN_ERR "cramfs: wrong endianness\n");
290 pr_err("cramfs: wrong endianness\n");
291 else if (!silent)
291 else if (!silent)
292 printk(KERN_ERR "cramfs: wrong magic\n");
292 pr_err("cramfs: wrong magic\n");
293 return -EINVAL;
294 }
295 }
296
297 /* get feature flags first */
298 if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
293 return -EINVAL;
294 }
295 }
296
297 /* get feature flags first */
298 if (super.flags & ~CRAMFS_SUPPORTED_FLAGS) {
299 printk(KERN_ERR "cramfs: unsupported filesystem features\n");
299 pr_err("cramfs: unsupported filesystem features\n");
300 return -EINVAL;
301 }
302
303 /* Check that the root inode is in a sane state */
304 if (!S_ISDIR(super.root.mode)) {
300 return -EINVAL;
301 }
302
303 /* Check that the root inode is in a sane state */
304 if (!S_ISDIR(super.root.mode)) {
305 printk(KERN_ERR "cramfs: root is not a directory\n");
305 pr_err("cramfs: root is not a directory\n");
306 return -EINVAL;
307 }
308 /* correct strange, hard-coded permissions of mkcramfs */
309 super.root.mode |= (S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
310
311 root_offset = super.root.offset << 2;
312 if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
313 sbi->size=super.size;
314 sbi->blocks=super.fsid.blocks;
315 sbi->files=super.fsid.files;
316 } else {
317 sbi->size=1<<28;
318 sbi->blocks=0;
319 sbi->files=0;
320 }
321 sbi->magic=super.magic;
322 sbi->flags=super.flags;
323 if (root_offset == 0)
306 return -EINVAL;
307 }
308 /* correct strange, hard-coded permissions of mkcramfs */
309 super.root.mode |= (S_IRUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
310
311 root_offset = super.root.offset << 2;
312 if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
313 sbi->size=super.size;
314 sbi->blocks=super.fsid.blocks;
315 sbi->files=super.fsid.files;
316 } else {
317 sbi->size=1<<28;
318 sbi->blocks=0;
319 sbi->files=0;
320 }
321 sbi->magic=super.magic;
322 sbi->flags=super.flags;
323 if (root_offset == 0)
324 printk(KERN_INFO "cramfs: empty filesystem");
324 pr_info("cramfs: empty filesystem");
325 else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
326 ((root_offset != sizeof(struct cramfs_super)) &&
327 (root_offset != 512 + sizeof(struct cramfs_super))))
328 {
325 else if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
326 ((root_offset != sizeof(struct cramfs_super)) &&
327 (root_offset != 512 + sizeof(struct cramfs_super))))
328 {
329 printk(KERN_ERR "cramfs: bad root offset %lu\n", root_offset);
329 pr_err("cramfs: bad root offset %lu\n", root_offset);
330 return -EINVAL;
331 }
332
333 /* Set it all up.. */
334 sb->s_op = &cramfs_ops;
335 root = get_cramfs_inode(sb, &super.root, 0);
336 if (IS_ERR(root))
337 return PTR_ERR(root);

--- 269 unchanged lines hidden --- 		330 return -EINVAL;
331 }
332
333 /* Set it all up.. */
334 sb->s_op = &cramfs_ops;
335 root = get_cramfs_inode(sb, &super.root, 0);
336 if (IS_ERR(root))
337 return PTR_ERR(root);

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