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cramfs: error message about endianess

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The README file in the cramfs subdirectory says: "All data is currently in
host-endian format; neither mkcramfs nor the kernel ever do swabbing."

If somebody tries to mount a cramfs with the wrong endianess, cramfs only
complains about a wrong magic but doesn't inform the user that only the
endianess isn't right.

The following patch adds an error message to the cramfs sources.  If a user
tries to mount a cramfs with the wrong endianess using the patched sources,
cramfs will display the message "cramfs: wrong endianess".

Signed-off-by: Andi Drebes <lists-receive@programmierforen.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Andi Drebes 2007-10-16 23:27:12 -07:00 • committed by Linus Torvalds
parent 7f44c3621a
commit ac8d35c565
2 changed files with 11 additions and 1 deletions
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11
fs/cramfs/inode.c
View file

@ -258,12 +258,21 @@ static int cramfs_fill_super(struct super_block *sb, void *data, int silent)
/* Do sanity checks on the superblock */
if (super.magic != CRAMFS_MAGIC) {
/* check for wrong endianess */
if (super.magic == CRAMFS_MAGIC_WEND) {
if (!silent)
printk(KERN_ERR "cramfs: wrong endianess\n");
goto out;
}
/* check at 512 byte offset */
mutex_lock(&read_mutex);
memcpy(&super, cramfs_read(sb, 512, sizeof(super)), sizeof(super));
mutex_unlock(&read_mutex);
if (super.magic != CRAMFS_MAGIC) {
if (!silent)
if (super.magic == CRAMFS_MAGIC_WEND && !silent)
printk(KERN_ERR "cramfs: wrong endianess\n");
else if (!silent)
printk(KERN_ERR "cramfs: wrong magic\n");
goto out;
}

1
include/linux/cramfs_fs.h
View file

@ -4,6 +4,7 @@
#include <linux/types.h>
#define CRAMFS_MAGIC 0x28cd3d45 /* some random number */
#define CRAMFS_MAGIC_WEND 0x453dcd28 /* magic number with the wrong endianess */
#define CRAMFS_SIGNATURE "Compressed ROMFS"
/*