should i expect trying to mount a cramfs fs to give me a segmentation fault?

[Sascha Hauer]

On Sat, Dec 01, 2012 at 11:28:08AM -0500, Robert P. J. Day wrote:
> 
>   again, just following along here:
> 
> http://wiki.barebox.org/doku.php?id=user:first_steps
> 
> i created a small cramfs filesystem image:
> 
> $ ls -l crypto.cramfs
> -rw-rw-r-- 1 rpjday rpjday 24576 Dec  1 11:19 crypto.cramfs
> $ file crypto.cramfs
> crypto.cramfs: Linux Compressed ROM File System data, little endian size 24576 version #2 sorted_dirs CRC 0x969356bc, edition 0, 24
> blocks, 13 files
> $
> 
> started barebox:
> 
> $ ./barebox -i crypto.cramfs
> add file crypto.cramfs()
> 
> 
> barebox 2012.11.0-00305-g159109f #1 Sat Dec 1 07:46:38 EST 2012
> 
> 
> Board: sandbox
> could not get tap device: Operation not permitted
> tap tap0: probe failed: Operation not permitted
> malloc space: 0x7f0f1cb3c010 -> 0x7f0f1d33c00f (size  8 MB)
> Open /dev/env0 No such file or directory
> no valid environment found on /dev/env0. Using default environment
> running /env/bin/init...
> set parameter: No such device
> set parameter: No such device
> set parameter: No such device
> set parameter: No such device
> set parameter: No such device
> barebox:/
> 
>   then tried to mount it as that page suggests:
> 
> barebox:/ mkdir mnt
> barebox:/ mount /dev/fd0 cramfs /mnt
> Segmentation fault (core dumped)
> rpjday at oneiric:~/OE/dist/barebox/git$
> 
>   i also tried the variation:
> 
> barebox> mount -t cramfs /dev/fd0 /mnt
> 
> same result.  help?

cramfs was present in barebox very early. I think in some places the
implementation still assumes that the filesystem image is directly
memory mapped. Probably we should investigate and either add a big
warning somewhere or fix it.

Sascha

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