passphrase_passwd_fd does not work

Hi,

I tried to mount a directory using

echo "passphrase_passwd=<>" | mount -t ecryptfs -o ecryptfs_sig=<>,ecryptfs_fnek_sig=<>,ecryptfs_cipher=aes,ecryptfs_key_bytes=32,ecryptfs_passthrough=no,key=passphrase:passphrase_passwd_fd=0 ~/Private ~/Private

(<> stands for removed parts)

Syslog reported

<> mount.ecryptfs: ecryptfs_get_module_ciphers: opendir error on [/lib/modules/2.6.34-gentoo-r12/kernel/crypto]. Cannot get a list of ciphers available as modules.
<> mount.ecryptfs: parse_options_file: mmap failed on fd [0]; rc = [-22]
<> mount.ecryptfs: tf_pass_file: Error parsing file for passwd; rc = [-22]

Then I had a look at ecryptfs-utils and discovered that the problem was in cmd_ln_parser.c. The call file_size = filestat.st_size returned 0 on my linux system since the file descriptor was a pipe.

I fixed it in the attached patch. I replaced mmap by read (until EOF). Please review the patch and tell me your opinion.

Greetings
Stephan