In parallel with the looping md5sum of everything in the 17G ecryptfs
read-only partition described above, I picked one of the files that
had produced different md5sums on different runs and wrote this script
to repeatedly md5sum the same file over and over (filename shortened
for clarity):
#!/bin/sh -u
# -Ian! D. Allen - <email address hidden> - www.idallen.com
f=filename
set -- $( md5sum "$f" )
start=$1
while : ; do
set -- $( md5sum "$f" )
if [ "$1" != "$start" ] ; then
echo "$start != $*"
fi
done
Over the course of two days running my tests, the above script produced
two outputs, indicating two times when that one file was read and had
a different checksum from when the script started:
See also comments #104 and #128.
In parallel with the looping md5sum of everything in the 17G ecryptfs
read-only partition described above, I picked one of the files that
had produced different md5sums on different runs and wrote this script
to repeatedly md5sum the same file over and over (filename shortened
for clarity):
#!/bin/sh -u
# -Ian! D. Allen - <email address hidden> - www.idallen.com
f=filename
set -- $( md5sum "$f" )
start=$1
while : ; do
set -- $( md5sum "$f" )
if [ "$1" != "$start" ] ; then
echo "$start != $*"
fi
done
Over the course of two days running my tests, the above script produced
two outputs, indicating two times when that one file was read and had
a different checksum from when the script started:
c68292cceb13f21 de7375c46c0ffdf 9a != 58a90406649b9e7 95f9e1e6b34b806 f8 filename de7375c46c0ffdf 9a != 58a90406649b9e7 95f9e1e6b34b806 f8 filename
c68292cceb13f21
This file is on a read-only ecryptfs partition. The md5sum should not
be changing.
I note that when the md5sum does change, it always changes to the same
"other" value; it's not random.
In my tests, the ecryptfs corruption seems to happen only when reading
from files with more than one link.
The file itself is 1132 bytes. Its encrypted base file is 12288 bytes.