This bug was fixed in the package vsftpd - 3.0.5-0ubuntu1.1
---
vsftpd (3.0.5-0ubuntu1.1) jammy; urgency=medium
* d/p/0078-0026-Prevent-hanging-in-SIGCHLD-handler.patch:
avoid hang with pam_exec (LP: #2069324)
-- Christian Ehrhardt Tue, 16 Jul
2024 09:52:02 +0200
** Changed
This bug was fixed in the package vsftpd - 3.0.5-0ubuntu0.20.04.2
---
vsftpd (3.0.5-0ubuntu0.20.04.2) focal; urgency=medium
* d/p/0076-0026-Prevent-hanging-in-SIGCHLD-handler.patch:
avoid hang with pam_exec (LP: #2069324)
-- Christian Ehrhardt Tue, 16 Jul
2024 09:50:23 +0200
Until we can reproduce on noble or later we can't act, marking it
invalid on those tasks.
** Changed in: vsftpd (Ubuntu Noble)
Status: Incomplete => Invalid
** Changed in: vsftpd (Ubuntu Oracular)
Status: Incomplete => Invalid
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The automated test failure was testbed setup, not related to the case.
A new run was enqueued and worked fine.
=> Bad run
https://autopkgtest.ubuntu.com/results/autopkgtest-focal/focal/s390x/v/vsftpd/20240802_001540_a3c4c@/log.gz
=> good re-run
https://autopkgtest.ubuntu.com/results/autopkgtest-f
Focal verification
1. Repro issue
root@f:~# apt install lftp vsftpd
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
ssl-cert
Suggested packages:
openssl-blacklist
The following NEW packages wi
Jammy verification
1. Repro issue
root@j:~# apt install lftp vsftpd
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
ssl-cert
The following NEW packages will be installed:
lftp ssl-cert vsftp
It's weird that noble+ don't show the bug, but I agree that it's not
worth updating there when we don't have a reported case, and our
reproducer doesn't work there.
** Changed in: vsftpd (Ubuntu Jammy)
Status: In Progress => Fix Committed
** Tags added: verification-needed verification-nee
MRs approved, uploaded for Focal and Jammy.
Now waiting for the SRU team to find time for reviewing it in the
-unapproved queue.
** Changed in: vsftpd (Ubuntu Focal)
Status: Confirmed => In Progress
** Changed in: vsftpd (Ubuntu Jammy)
Status: Confirmed => In Progress
** Changed i
** Description changed:
[ Impact ]
- * when running sub-processes on login through pam_exec a process
+ * User impact: under certain conditions using pam_exec the vsftp server
+just hangs
+
+ * Reason: when running sub-processes on login through pam_exec a process
is spawned. Tha
** Description changed:
[ Impact ]
- * when running sub-processes on login through pam_exec a process
-is spawned. That can confuse vsftp if that child ends triggering SIGCHLD
but
-already been picke dup by e.g. pam_exec.so itself.
+ * when running sub-processes on login through p
** Description changed:
+ [ Impact ]
+
+ * when running sub-processes on login through pam_exec a process
+is spawned. That can confuse vsftp if that child ends triggering SIGCHLD
but
+already been picke dup by e.g. pam_exec.so itself.
+
+ * The fix uses waitpid over wait to be able
** Merge proposal linked:
https://code.launchpad.net/~paelzer/ubuntu/+source/vsftpd/+git/vsftpd/+merge/469466
** Merge proposal linked:
https://code.launchpad.net/~paelzer/ubuntu/+source/vsftpd/+git/vsftpd/+merge/469467
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I was double checking this on other releases and got the hang on focal.
I could indeed only trigger this with FTPS on focal, but AFAICS the same config
as on Oracular.
That motivated me, so I tried fresh F,J,N,O systems which in theory should all
be the same but obviously behave different.
And I
Thanks Markus
#1 trying with this now:
account optionalpam_exec.so debug quiet /root/foo.sh
And
$ cat /root/foo.sh
#!/bin/bash
/bin/true
touch /tmp/brooks-was-here
/bin/true
By default vsftp is configured for the snakeoil certificate to get started
easily, but with ssl disabled.
Hello,
I acutally run a shell script /root/foo.sh which runs several commands.
Maybe that is a difference.
And I only use FTPS to connect.
Regards,
Markus
Am 12.07.24 um 09:33 schrieb Christian Ehrhardt :
> Hi,
> first of all thanks for all the prep work.
> The patch LGTM and I agree we should
Hi,
first of all thanks for all the prep work.
The patch LGTM and I agree we should add it.
I was happy to see the suggestions on how to reproduce, but while writing it
out in more detail could not reproduce the hang. The following are the steps I
drafted to an SRU templates "how to test and veri
Hello,
reproduction is quite simple. Just add a pam_exec.so to PAM-config to
run a small script.
"exit 0" might do it.
Or even simpler:
accountoptional pam_exec.so debug quiet /bin/true
Without the Patch vsftp hangs after a successful login. With the patch
it continues running.
Regards,
Thank you for your time in attempting to install the package Markus.
I agree with Paride in
https://bugs.launchpad.net/ubuntu/+source/vsftpd/+bug/2069324/comments/8,
we should go ahead and implement this fix on our side.
I'll attempt a quick repro tomorrow, but I'm pretty booked so if it
takes su
** Changed in: vsftpd (Debian)
Status: Unknown => New
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Title:
vsftpd hangs with SIGCHLD when pam_exec.so is used
To manage notifications
Sorry, I have no oracular to install the package. Only debian bookworm
where it is not installable due to missing dependencies.
I only uses the ubuntu sources to build my own patched version for debian.
Am 03.07.24 um 06:14 schrieb Bryce Harrington:
> Hi Markus - looks like Mitchell's PPA build s
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Hi Markus - looks like Mitchell's PPA build succeeded. Have you had a
chance to install it on your server and test that it isn't showing the
crash?
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https://bugs.launchpad.net/bugs/206932
** Bug watch added: Red Hat Bugzilla #1198259
https://bugzilla.redhat.com/show_bug.cgi?id=1198259
** Also affects: vsftpd (Fedora) via
https://bugzilla.redhat.com/show_bug.cgi?id=1198259
Importance: Unknown
Status: Unknown
** Also affects: vsftpd (Debian) via
https://bugs.debia
Just kicked off a build at [0].
[0] - https://launchpad.net/~mitchdz/+archive/ubuntu/lp2069324-vsftpd-
sigchld
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https://bugs.launchpad.net/bugs/2069324
Title:
vsftpd hangs with SIGCHLD
Thanks Markus, I'll make a PPA for that right now.
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Title:
vsftpd hangs with SIGCHLD when pam_exec.so is used
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When it is needed I can try to install it on my server.
Am 21.06.24 um 07:33 schrieb Mitchell Dzurick:
> Markus, if we prepare a package with the patch, would you be willing to
> help out testing the patch?
>
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Markus, if we prepare a package with the patch, would you be willing to
help out testing the patch?
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https://bugs.launchpad.net/bugs/2069324
Title:
vsftpd hangs with SIGCHLD when pam_ex
Looks like upstream development is *very* slow, and I could not find an
issue tracker or a public vcs repo. Given that we have Ubuntu delta
already (we're already ahead of Debian, which is still packaging 3.0.3),
I believe it makes sense to add the patch to the Ubuntu package.
** Tags added: serv
** Bug watch added: Debian Bug tracker #952421
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952421
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https://bugs.launchpad.net/bugs/2069324
Title:
vsftpd hangs with SIGCHLD when
Well, there is a bug report from 2020 about the problem:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=952421
Am 18.06.24 um 21:01 schrieb Mitchell Dzurick:
> Markus, would you mind making a bug report upstream to see if this could
> be included?
>
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Markus, would you mind making a bug report upstream to see if this could
be included?
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https://bugs.launchpad.net/bugs/2069324
Title:
vsftpd hangs with SIGCHLD when pam_exec.so is used
Hello,
actually I am running "bookworm" and noticed that the packet is quite
abandoned so I looked at the Ubuntu repository which had a newer release
of vsftpd but also quite old.
I build the ubuntu package on debian bookworm an noticed the same error.
Then I rebuilt the same package with the
Markus, if I were to create a PPA with this patch applied, would you be
willing to help test that out?
** Changed in: vsftpd (Ubuntu)
Status: New => Triaged
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Thank you for taking the time to make this bug report Markus!
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Title:
vsftpd hangs with SIGCHLD when pam_exec.so is used
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What version of Ubuntu are you seeing this bug on? Unfortunately
upstream/debian has been pretty dormant for a while, in-fact we are
ahead of debian right now, so it may make sense to apply this patch.
Unfortunately it looks like even upstream does not have this patch
applied.
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