Package: encfs
Version: 1.2.5-1-1+b2
Severity: normal
Hello,
I want to use EncFS to encrypt data that are stored on NFSv4 server.
The server is not under my control and I want to keep data protected against
reading
by admin of the NFS server. So I mounted nfs4 filesystem, made two empty
directories:
backup.encfs and backup.plain and run:
encfs /nfs4/backup.encfs/ /nfs4/backup.plain/
Initial setup went OK, a file named .encfs appeared in backup.encfs, and I was
able
to mount, umount, and cd into backup.plain. However when I wanted to create a
file in
encfs mounted backup.plain, i got a kernel BUG at fs/nfs/nfs4xdr.c:870!
I searched the net and found some issues about nfs4 but they were not related.
I tried
to upgrade kernel to etchandahalf and the bug is the same, just on different
line number.
In both cases it is the function encode_share_access, and the line BUG().
static void encode_share_access(struct xdr_stream *xdr, int open_flags)
{
uint32_t *p;
RESERVE_SPACE(8);
switch (open_flags & (FMODE_READ|FMODE_WRITE)) {
case FMODE_READ:
WRITE32(NFS4_SHARE_ACCESS_READ);
break;
case FMODE_WRITE:
WRITE32(NFS4_SHARE_ACCESS_WRITE);
break;
case FMODE_READ|FMODE_WRITE:
WRITE32(NFS4_SHARE_ACCESS_BOTH);
break;
default:
BUG(); #### HERE ####
}
WRITE32(0); /* for linux, share_deny = 0 always */
}
It seems to me as if encfs is trying to open a file which is neither for
reading nor for
writing, which is obviously nonsense and therefore rejected. Unfortunately both
the encfs
and nfs4 mounts hang and cannot be unmounted until reboot.
-- System Information:
Debian Release: 4.0
APT prefers stable
APT policy: (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-6-686-bigmem
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) (ignored: LC_ALL set to C)
Versions of packages encfs depends on:
ii fuse-utils 2.5.3-4.4 Filesystem in USErspace (utilities
ii libc6 2.3.6.ds1-13etch8 GNU C Library: Shared libraries
ii libfuse2 2.5.3-4.4 Filesystem in USErspace library
ii libgcc1 1:4.1.1-21 GCC support library
ii librlog1c2a 1.3.7-1 flexible message logging library
ii libssl0.9.8 0.9.8c-4etch4 SSL shared libraries
ii libstdc++6 4.1.1-21 The GNU Standard C++ Library v3
encfs recommends no packages.
-- no debconf information
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