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Posted to bugs@httpd.apache.org by bu...@apache.org on 2012/03/13 01:22:47 UTC
DO NOT REPLY [Bug 52894] New: Apache aborts abnormally when
ChrootDir is set
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
Bug #: 52894
Summary: Apache aborts abnormally when ChrootDir is set
Product: Apache httpd-2
Version: 2.4.1
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: mod_unixd
AssignedTo: bugs@httpd.apache.org
ReportedBy: tixu@cs.ucsd.edu
Classification: Unclassified
To replay the abnormal abort, put the following line in httpd.conf:
ChrootDir /home/username/Downloads
note that "username" is the valid user name, so the path is a valid path (make
sure you use a valid path but not "/").
Then, run Apache httpd as root (use "su"), Apache httpd will abort abnormally,
with the following error message in error log:
libgcc_s.so.1 must be installed for pthread_cancel to work
By tracing the source code by gdb, we find that the abort is caused by calling
pthread_exit() in apr_thread_exit() in srclib/apr/threadproc/unix/thread.c
which is called by start_threads() in server/mpm/event/event.c or
server/mpm/worker/worker.c.
The strange thing is that when using the following configuration setting:
ChrootDir /
Everything is fine. The pthread_exit() is also called but it goes smoothly.
Also running without root (i.e., as normal user) won't cause this abort.
We have replayed this on Ubuntu 10.04, Ubuntu 11.10, and Fedora 13, the abort
behavior happened in all these three systems.
Thanks!
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
Tianyin Xu <ti...@cs.ucsd.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
--- Comment #2 from Tianyin Xu <ti...@cs.ucsd.edu> 2012-03-13 00:40:54 UTC ---
(In reply to comment #1)
> Is there something unreasonable about having that lib in the chroot?
Hi, Eric,
We have the libgcc (otherwise it's no way to build from the source code). The
information is not accurate.
Another thing is that when you configure
ChrootDir /
It goes through the same routine without any problem. Note that it also calls
pthread_exit() which led to the abort in configuration "ChrootDir /home/user".
I really have no idea why these two configurations makes the difference.
Thanks!
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
--- Comment #5 from Eric Covener <co...@gmail.com> 2012-03-13 01:02:38 UTC ---
I recall passing references to it being necessary within the chroot before.
It's still not clear from your comments whether it's available both in your
root and chroot.
If it's required, and not present in the chroot, We won't second-guess that the
system wants it there.
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
--- Comment #6 from Tianyin Xu <ti...@cs.ucsd.edu> 2012-03-13 01:55:17 UTC ---
(In reply to comment #5)
> I recall passing references to it being necessary within the chroot before.
> It's still not clear from your comments whether it's available both in your
> root and chroot.
>
> If it's required, and not present in the chroot, We won't second-guess that the
> system wants it there.
Ok, so now I understand the problem.
So basically, 'chroot' is to run a program with a specified root directory. I
changed the root directory to some "dubby" directory (although it's a valid
directory). In the mean time, the dubby directory is not linked with the
libgcc. As a result, when I call the pthread_exit(), it just aborts with the
message to let me install libgcc.
On the other hand, when I chroot to "/" which is the default root directory,
nothing changed and everything goes smoothly.
I have to say that the system response is really important. The error message
here is kind of misleading...:(
Thanks a lot for your patient, Eric. I do appreciate very much!
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
Eric Covener <co...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
--- Comment #1 from Eric Covener <co...@gmail.com> 2012-03-13 00:27:56 UTC ---
Is there something unreasonable about having that lib in the chroot?
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
Eric Covener <co...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
--- Comment #3 from Eric Covener <co...@gmail.com> 2012-03-13 00:43:29 UTC ---
(In reply to comment #2)
> (In reply to comment #1)
> > Is there something unreasonable about having that lib in the chroot?
>
> Hi, Eric,
>
> We have the libgcc (otherwise it's no way to build from the source code). The
> information is not accurate.
>
> Another thing is that when you configure
>
> ChrootDir /
>
> It goes through the same routine without any problem. Note that it also calls
> pthread_exit() which led to the abort in configuration "ChrootDir /home/user".
>
> I really have no idea why these two configurations makes the difference.
>
This is all consistent with it being present and usable in the root and not in
the chroot.
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
--- Comment #4 from Tianyin Xu <ti...@cs.ucsd.edu> 2012-03-13 00:56:21 UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> > (In reply to comment #1)
> > > Is there something unreasonable about having that lib in the chroot?
> >
> > Hi, Eric,
> >
> > We have the libgcc (otherwise it's no way to build from the source code). The
> > information is not accurate.
> >
> > Another thing is that when you configure
> >
> > ChrootDir /
> >
> > It goes through the same routine without any problem. Note that it also calls
> > pthread_exit() which led to the abort in configuration "ChrootDir /home/user".
> >
> > I really have no idea why these two configurations makes the difference.
> >
>
> This is all consistent with it being present and usable in the root and not in
> the chroot.
Hi, Eric,
Sorry for the bothering. I still don't get it.:(
Do you mean this is a normal behavior? Could you please explain a little bit
more? Also, do you need more information on this (I see you changed it to
NEEDINFO)?
Thanks a lot for the help!
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DO NOT REPLY [Bug 52894] Apache aborts abnormally when ChrootDir is
set
Posted by bu...@apache.org.
https://issues.apache.org/bugzilla/show_bug.cgi?id=52894
Tianyin Xu <ti...@cs.ucsd.edu> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tixu@cs.ucsd.edu
--
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