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| author | Andi Drebes <lists-receive@programmierforen.de> | 2007-10-16 23:27:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:53 -0700 |
| commit | ac8d35c5658377c280dc830352f66233e2f76f73 (patch) | |
| tree | bf0f460defa448c4a01c8d3acb6fa1d03c48fc36 | |
| parent | 7f44c3621a41576d755668c48d0caf894c228fa9 (diff) | |
| download | linux-3.10-ac8d35c5658377c280dc830352f66233e2f76f73.tar.gz linux-3.10-ac8d35c5658377c280dc830352f66233e2f76f73.tar.bz2 linux-3.10-ac8d35c5658377c280dc830352f66233e2f76f73.zip | |
cramfs: error message about endianess
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>
| -rw-r--r-- | fs/cramfs/inode.c | 11 | ||||
| -rw-r--r-- | include/linux/cramfs_fs.h | 1 |
2 files changed, 11 insertions, 1 deletions
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c index 3d194a2be3f..5c817bd0838 100644 --- a/fs/cramfs/inode.c +++ b/fs/cramfs/inode.c @@ -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; } diff --git a/include/linux/cramfs_fs.h b/include/linux/cramfs_fs.h index 1dba681e428..3be4e5a27d8 100644 --- a/include/linux/cramfs_fs.h +++ b/include/linux/cramfs_fs.h @@ -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" /* |