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Description of problem:
It turns out there has been a fairly long standing bug
in the v3 and v2 readdir paths that causes a readdir loop
because the xdr decoding routines would lose a cookie.
The readdir loop was detached and recovered by the
patches in bz720712. The loop was cause when a
file name length did not end up on a 4-byte alignment
it would cause the xdr routines blow by the next cookie.
Version-Release number of selected component (if applicable):
The problme was first seen on a -157 kernel.
How reproducible:
Somewhat...
Steps to Reproduce:
1. mount -o v3 homedirs.bos.redhat.com:/vol/data/home/boston /home/tmp/
2. ls /home/tmp/jmoyer/News/drafts/drafts
3.
Comment 1RHEL Program Management
2011-07-14 19:00:50 UTC
This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update release.
The bug can't be reproduced, using such test command:
for ((;;)) ; do
namelen=$(( $RANDOM % 10));
name="a" ;
for ((j=0;j<$namelen;j++)) ; do
name=a$name;
done;
mkdir $name ; cd $name ; find /home/tmp/jmoyer;
done
Take nfsv3 as an example, I haven't find the flaw of the code:
p = xdr_decode_hyper(p, &entry->ino);
- entry->len = ntohl(*p++);
- p = xdr_inline_decode(xdr, entry->len + 8);
if (unlikely(!p))
goto out_overflow;
entry->name = (const char *) p;
- p += XDR_QUADLEN(entry->len);
entry->prev_cookie = entry->cookie;
p = xdr_decode_hyper(p, &entry->cookie);
because when encoding string, xdr will take space of 4-align-size, even the string's length is not 4-align.
Sanityonly test.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2011-1530.html