The bug is in ecryptfs_read_and_validate_xattr_region(). It calls
ecryptfs_getxattr_lower(), which is returning -34 (ERANGE). With
ecryptfs_getxattr_lower() failing, it means that we can't retrieve the
proper file size from the xattr metadata and can't set an an accurate
value in the kstat buffer.
** Changed in: ecryptfs
Status: Confirmed => Triaged
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https://bugs.launchpad.net/bugs/1612492
Title:
remounting breaks size reporting and rsync
Status in eCryptfs:
Triaged
Status in ecryptfs-utils:
Invalid
Status in linux package in Ubuntu:
Confirmed
Bug description:
Sorry to resurrect an old bug, it looks like a fix applied a while
back may end up breaking rsync.
For reference, it looks like the decision in this bug fix was to pass on the
encrypted file size on disk to stat calls looking at the unencrypted mount:
https://bugs.launchpad.net/ecryptfs/+bug/390833
For reference, to reproduce:
mkdir /mnt/raw
mkdir /mnt/decrypted
dd if=/dev/urandom of=file.out2 bs=1MB count=100
mount -t ecryptfs -o
ecryptfs_passthrough=n,no_sig_cache,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_xattr,ecryptfs_enable_filename_crypto=y,passphrase_passwd=SECRET,ecryptfs_fnek_sig=SECRET
/mnt/raw /mnt/decrypted
rsync file.out2 /mnt/decrypted/
stat /mnt/decrypted/file.out2
# you get size 100000000
umount /mnt/decrypted/
mount -t ecryptfs -o
ecryptfs_passthrough=n,no_sig_cache,ecryptfs_cipher=aes,ecryptfs_key_bytes=16,ecryptfs_xattr,ecryptfs_enable_filename_crypto=y,passphrase_passwd=SECRET,ecryptfs_fnek_sig=SECRET
/mnt/raw /mnt/decrypted
stat /mnt/decrypted/file.out2
# you get size 100003840
What this means in practice is any additional rsyncs to that target
after remounting will see the file size as different than the
original, and issue a full new copy. My use case is ecryptfs over a
remote file system, so rsync is no better than cp.
Would it be possible to make file size reporting consistent, and
reflective of the size of the file as a reader would see it?
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