Thanks for the patch; it definitely helps identify the problem. I don't
think it is a completely correct change, however.
The problem is that it's doing the translation in
write_xattrs_to_buffer(), but it is not making the translation in the
opposite direction in read_xattrs_to_buffer(). This means if some
other program using this library function --- for example, fuse2fs,
reads in an existing xattr block with an ACL, it will read it the on-
disk format, _not_ translate it to a standard acl format, and then
write_xattrs_to_buffer() will take as input an acl encoded in the on-
disk format, and then try to convert it from lgetxattr format to on-disk
format again, and Much Hilarity will result.
I also wonder if write_xattrs_to_buffer() is the right place to make
this conversion, or rather ext2fs_{read,write}_ext_attr3(). Then what
is stored in the handle structure is the on-disk encoding, and we would
do the translation at the higher layer function rather than the low-
level read/write functions.
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https://bugs.launchpad.net/bugs/1645232
Title:
e2fsprogs - could not preserve ACL permissions : The getxattr()
returns with (EINVAL)
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