The patch titled
cramfs: error message about endianess
has been added to the -mm tree. Its filename is
cramfs-error-message-about-endianess.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: cramfs: error message about endianess
From: Andi Drebes <lists-receive@xxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/cramfs/inode.c | 11 ++++++++++-
include/linux/cramfs_fs.h | 1 +
2 files changed, 11 insertions(+), 1 deletion(-)
diff -puN fs/cramfs/inode.c~cramfs-error-message-about-endianess fs/cramfs/inode.c
--- a/fs/cramfs/inode.c~cramfs-error-message-about-endianess
+++ a/fs/cramfs/inode.c
@@ -258,12 +258,21 @@ static int cramfs_fill_super(struct supe
/* 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 -puN include/linux/cramfs_fs.h~cramfs-error-message-about-endianess include/linux/cramfs_fs.h
--- a/include/linux/cramfs_fs.h~cramfs-error-message-about-endianess
+++ a/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"
/*
_
Patches currently in -mm which might be from lists-receive@xxxxxxxxxxxxxxxxxxx are
git-dvb.patch
cramfs-error-message-about-endianess.patch
-
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