GNU bug report logs - #47576
[security] ibus-daemon launches ungrafted subprocesses

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Package: guix; Reported by: Mark H Weaver <mhw@HIDDEN>; Keywords: security; dated Sat, 3 Apr 2021 04:46:01 UTC; Maintainer for guix is bug-guix@HIDDEN.
Added tag(s) security. Request was from Léo Le Bouter <lle-bout@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Mark H Weaver <mhw@HIDDEN>
To: Julien Lepiller <julien@HIDDEN>, 47576 <at> debbugs.gnu.org
Subject: Re: bug#47576: [security] ibus-daemon launches ungrafted subprocesses
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Hi Julien,

Julien Lepiller <julien@HIDDEN> writes:
> We should probably fix ibus so it regenerates its cache when it's a
> different process. It could be as simple as using a subdirectory
> computed from the absolute name of the ibus binary, maybe.

Would you like to try?

I won't be able to work more on this bug anytime soon, but I hope that
others will pick it up.

     Thanks,
       Mark




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bug#47576; Package guix. Full text available.

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Subject: Re: bug#47576: [security] ibus-daemon launches ungrafted subprocesses
From: Maxime Devos <maximedevos@HIDDEN>
To: Mark H Weaver <mhw@HIDDEN>, 47576 <at> debbugs.gnu.org
Date: Sat, 03 Apr 2021 15:16:49 +0200
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On Sat, 2021-04-03 at 03:12 -0400, Mark H Weaver wrote:
> [...]
>=20
> The following ungrafted libraries are loaded by processes from the
> mysterious old version of 'ibus' on my system: glib, cairo, and libx11.
> I still have no clue where the reference to that mysterious old version
> (/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22) is coming
> from.
>=20
> Are other people seeing this?  Here's an easy way to check:
>=20
> [...]
>=20
> If you run this command, do you also see different 'ibus' store items
> used by the daemon and its subprocesses?

I also see different store items:

$ ps axf | grep -e -ibus-
> 1141 tty7     Sl     0:00  |           |   \_ /gnu/store/a7lxf1i35yqil6px=
wxhzvr5q3xcqldyq-ibus-1.5.22/bin/ibus-daemon --panel disable -r
--xim
> 1146 tty7     Sl     0:00  |           |       \_ /gnu/store/7m04iv3pks6m=
6p8czw1mj58194rnfjyy-ibus-1.5.22/libexec/ibus-dconf
> 1269 tty7     Sl     0:00  |           |       \_ /gnu/store/7m04iv3pks6m=
6p8czw1mj58194rnfjyy-ibus-1.5.22/libexec/ibus-engine-simple
> 1148 tty7     Sl     0:00 /gnu/store/a7lxf1i35yqil6pxwxhzvr5q3xcqldyq-ibu=
s-1.5.22/libexec/ibus-x11 --kill-daemon
> 25649 pts/5    S+     0:00      \_ grep --color=3Dauto -e -ibus-

FWIW, this is on MATE.  (TODO to self: investigate why GNOME Shell crashes
after a few seconds.)

Greetings,
Maxime.

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bug#47576; Package guix. Full text available.

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Subject: Re: bug#47576: [security] ibus-daemon launches ungrafted subprocesses
To: Mark H Weaver <mhw@HIDDEN>,47576 <at> debbugs.gnu.org
From: Julien Lepiller <julien@HIDDEN>
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Oh! That would explain why I had so much trouble fixing/updating ibus and i=
bus-anthy!

We should probably fix ibus so it regenerates its cache when it's a differ=
ent process=2E It could be as simple as using a subdirectory computed from =
the absolute name of the ibus binary, maybe=2E

Le 3 avril 2021 03:31:44 GMT-04:00, Mark H Weaver <mhw@netris=2Eorg> a =C3=
=A9crit :
>I wrote:
>> I still have no clue where the reference to that mysterious old
>version
>> (/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1=2E5=2E22) is coming
>> from=2E
>
>I found them:
>
>  ~/=2Ecache/ibus/bus/registry
>  /var/lib/gdm/=2Ecache/ibus/bus/registry
>
>On my system, those files include absolute pathnames to programs in
>/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1=2E5=2E22, which I
>compiled last December=2E
>
>That old store item has been kept safe from GC for only one reason:
>because 'ibus-daemon', along with its subprocesses, tend to be running
>whenever I run "guix gc", and "guix gc" protects store items that are
>currently in use by active processes=2E
>
>      Mark

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<html><head></head><body>Oh! That would explain why I had so much trouble f=
ixing/updating ibus and ibus-anthy!<br><br>We should probably fix ibus so i=
t regenerates its cache when it's a different process=2E It could be as sim=
ple as using a subdirectory computed from the absolute name of the ibus bin=
ary, maybe=2E<br><br><div class=3D"gmail_quote">Le 3 avril 2021 03:31:44 GM=
T-04:00, Mark H Weaver &lt;mhw@netris=2Eorg&gt; a =C3=A9crit :<blockquote c=
lass=3D"gmail_quote" style=3D"margin: 0pt 0pt 0pt 0=2E8ex; border-left: 1px=
 solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class=3D"k9mail">I wrote:<br><blockquote class=3D"gmail_quote" style=
=3D"margin: 0pt 0pt 1ex 0=2E8ex; border-left: 1px solid #729fcf; padding-le=
ft: 1ex;">I still have no clue where the reference to that mysterious old v=
ersion<br>(/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1=2E5=2E22) is =
coming<br>from=2E<br></blockquote><br>I found them:<br><br>  ~/=2Ecache/ibu=
s/bus/registry<br>  /var/lib/gdm/=2Ecache/ibus/bus/registry<br><br>On my sy=
stem, those files include absolute pathnames to programs in<br>/gnu/store/a=
4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1=2E5=2E22, which I<br>compiled last D=
ecember=2E<br><br>That old store item has been kept safe from GC for only o=
ne reason:<br>because 'ibus-daemon', along with its subprocesses, tend to b=
e running<br>whenever I run "guix gc", and "guix gc" protects store items t=
hat are<br>currently in use by active processes=2E<br><br>      Mark<br><br=
><br><br></pre></blockquote></div></body></html>
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To: 47576 <at> debbugs.gnu.org
Subject: Re: bug#47576: [security] ibus-daemon launches ungrafted subprocesses
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I wrote:
> I still have no clue where the reference to that mysterious old version
> (/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22) is coming
> from.

I found them:

  ~/.cache/ibus/bus/registry
  /var/lib/gdm/.cache/ibus/bus/registry

On my system, those files include absolute pathnames to programs in
/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22, which I
compiled last December.

That old store item has been kept safe from GC for only one reason:
because 'ibus-daemon', along with its subprocesses, tend to be running
whenever I run "guix gc", and "guix gc" protects store items that are
currently in use by active processes.

      Mark




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bug#47576; Package guix. Full text available.

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Earlier, I wrote:
> Looking for references to the old 'glib' was the *first* thing I
> checked.  I haven't yet checked anything else, so I don't know how
> widespread this problem is.

I looked for other ungrafted libraries loaded on my system, and I'm glad
to report that I see no evidence of any grafting problem other than this
'ibus-daemon' issue.

The following ungrafted libraries are loaded by processes from the
mysterious old version of 'ibus' on my system: glib, cairo, and libx11.
I still have no clue where the reference to that mysterious old version
(/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22) is coming
from.

Are other people seeing this?  Here's an easy way to check:

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ ps axf | grep -e -ibus-
  402 tty7     Sl     0:00  |           |   \_ /gnu/store/vdc4j6c9psx8jicr5h2n8jdxsfjms3h2-ibus-1.5.22/bin/ibus-daemon --panel disable -r --xim
  407 tty7     Sl     0:00  |           |       \_ /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-dconf
  450 tty7     Sl     0:00  |           |       \_ /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-engine-simple
  798 tty8     Sl     0:00              |   \_ /gnu/store/vdc4j6c9psx8jicr5h2n8jdxsfjms3h2-ibus-1.5.22/bin/ibus-daemon --panel disable -r --xim
  804 tty8     Sl     0:00              |   |   \_ /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-dconf
  805 tty8     Sl     0:01              |   |   \_ /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-extension-gtk3
  894 tty8     Sl     0:00              |   |   \_ /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-engine-simple
 2246 pts/0    S+     0:00              |   |   |   \_ grep -e -ibus-
  409 tty7     Sl     0:00 /gnu/store/vdc4j6c9psx8jicr5h2n8jdxsfjms3h2-ibus-1.5.22/libexec/ibus-x11 --kill-daemon
  808 tty8     Sl     0:00 /gnu/store/vdc4j6c9psx8jicr5h2n8jdxsfjms3h2-ibus-1.5.22/libexec/ibus-x11 --kill-daemon
--8<---------------cut here---------------end--------------->8---

If you run this command, do you also see different 'ibus' store items
used by the daemon and its subprocesses?

      Mark




Information forwarded to bug-guix@HIDDEN:
bug#47576; Package guix. Full text available.

Message received at 47576 <at> debbugs.gnu.org:


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Subject: Re: bug#47576: [security] ibus-daemon launches ungrafted subprocesses
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Here's an obvious check that I should have included in my last message:

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ guix gc --referrers /gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22
/gnu/store/a4r6q1fbfqapy5hrrxap1yg96rjgln6q-ibus-1.5.22
mhw@jojen ~$ 
--8<---------------cut here---------------end--------------->8---

This is the 'ibus' that I last built in December 2020, and which is
somehow, mysteriously, being used for the subprocesses of 'ibus-daemon'.

       Mark




Information forwarded to bug-guix@HIDDEN:
bug#47576; Package guix. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Mark H Weaver <mhw@HIDDEN>
To: bug-guix@HIDDEN
Subject: [security] ibus-daemon launches ungrafted subprocesses
Date: Sat, 03 Apr 2021 00:44:02 -0400
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Several processes on my Guix system load shared libraries from the
*ungrafted* glib: specifically, all of the subprocesses of
'ibus-daemon'.

The 'ibus-daemon' process itself seems to be properly grafted.  However,
its subprocesses are from an old, ungrafted build of 'ibus':

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ pstree -up 796
.ibus-daemon-re(796,mhw)=E2=94=80=E2=94=AC=E2=94=80.ibus-dconf-rea(803)=E2=
=94=80=E2=94=AC=E2=94=80{.ibus-dconf-rea}(806)
                         =E2=94=82                      =E2=94=94=E2=94=80{=
.ibus-dconf-rea}(807)
                         =E2=94=9C=E2=94=80.ibus-engine-si(892)=E2=94=80=E2=
=94=AC=E2=94=80{.ibus-engine-si}(917)
                         =E2=94=82                      =E2=94=94=E2=94=80{=
.ibus-engine-si}(918)
                         =E2=94=9C=E2=94=80.ibus-extension(804)=E2=94=80=E2=
=94=AC=E2=94=80{.ibus-extension}(810)
                         =E2=94=82                      =E2=94=9C=E2=94=80{=
.ibus-extension}(811)
                         =E2=94=82                      =E2=94=94=E2=94=80{=
.ibus-extension}(819)
                         =E2=94=9C=E2=94=80{.ibus-daemon-re}(797)
                         =E2=94=94=E2=94=80{.ibus-daemon-re}(798)
mhw@jojen ~$ ps -fq 796,803,892,804
UID        PID  PPID  C STIME TTY          TIME CMD
mhw        796   698  0 00:10 tty8     00:00:00 /gnu/store/radg6xacqvw60d76=
k97y0ydccjm7iq7a-ibus-1.5.22/bin/ibus-daemon --panel disable -r --xim
mhw        803   796  0 00:10 tty8     00:00:00 /gnu/store/a4r6q1fbfqapy5hr=
rxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-dconf
mhw        892   796  0 00:10 tty8     00:00:00 /gnu/store/a4r6q1fbfqapy5hr=
rxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-engine-simple
mhw        804   796  2 00:10 tty8     00:00:01 /gnu/store/a4r6q1fbfqapy5hr=
rxap1yg96rjgln6q-ibus-1.5.22/libexec/ibus-extension-gtk3
--8<---------------cut here---------------end--------------->8---

(The same issue occurs for the 'ibus-daemon' that's owned by 'gdm').

/gnu/store/radg=E2=80=A6-ibus-1.5.22 seems to be the properly grafted 'ibus=
',
replacing the ungrafted /gnu/store/wnqv=E2=80=A6-ibus-1.5.22 which I last b=
uilt
on February 2nd: (I don't use substitutes)

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ bzcat $(guix build --log-file /gnu/store/radg6xacqvw60d76k97y0=
ydccjm7iq7a-ibus-1.5.22)
grafting '/gnu/store/wnqv8rj3ngjivl6334d1h8irszf39dm9-ibus-1.5.22' -> '/gnu=
/store/radg6xacqvw60d76k97y0ydccjm7iq7a-ibus-1.5.22'...
mhw@jojen ~$ ls -l $(guix build --log-file /gnu/store/wnqv8rj3ngjivl6334d1h=
8irszf39dm9-ibus-1.5.22)
-rw-r--r-- 1 root root 24923 Feb  2 10:35 /var/log/guix/drvs/hx/qpdblmghj7p=
vg0ni2l38p0a1s4igbd-ibus-1.5.22.drv.bz2
--8<---------------cut here---------------end--------------->8---

The reference scanner does not see any references to any other 'ibus',
from either my system, my user profile, or the grafted 'ibus':

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ guix gc -R $(readlink -f /run/current-system) | grep -e -ibus-
/gnu/store/radg6xacqvw60d76k97y0ydccjm7iq7a-ibus-1.5.22
mhw@jojen ~$ guix gc -R $(readlink -f ~/.guix-profile) | grep -e -ibus-
mhw@jojen ~$ guix gc -R /gnu/store/radg6xacqvw60d76k97y0ydccjm7iq7a-ibus-1.=
5.22 | grep -e -ibus-
/gnu/store/radg6xacqvw60d76k97y0ydccjm7iq7a-ibus-1.5.22
--8<---------------cut here---------------end--------------->8---

Interestingly, the subprocesses are *not* from the ungrafted 'ibus' that
I last built on February 2nd.  Instead, they are from a much older
ungrafted 'ibus', which I last built on December 20th of last year:

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ ls -l $(guix build --log-file /gnu/store/a4r6q1fbfqapy5hrrxap1=
yg96rjgln6q-ibus-1.5.22)
-rw-r--r-- 1 root root 24981 Dec 20 20:33 /var/log/guix/drvs/sn/k6581cpk6n8=
q3dvsarqmqimhx0n2i2-ibus-1.5.22.drv.bz2
--8<---------------cut here---------------end--------------->8---

I'm at a bit of a loss of where this much older, ungrafted 'ibus' is
coming from.  Running "guix build ibus", with and without grafts, give
the other two 'ibus' store items:

--8<---------------cut here---------------start------------->8---
mhw@jojen ~$ guix build ibus --no-grafts
/gnu/store/wnqv8rj3ngjivl6334d1h8irszf39dm9-ibus-1.5.22
mhw@jojen ~$ guix build ibus
/gnu/store/radg6xacqvw60d76k97y0ydccjm7iq7a-ibus-1.5.22
--8<---------------cut here---------------end--------------->8---

Is there another variant of the 'ibus' package hiding somewhere?
Where is "/gnu/store/a4r6=E2=80=A6-ibus-1.5.22" coming from?

I don't know that I'll have the energy to investigate this further
anytime soon, so I'm hoping that someone else will pick this up.

* * *

FYI, I discovered this while doing sanity checks on my new preliminary
grafting implementation (which supports rewriting UTF-16/32 store
references).  Looking for references to the old 'glib' was the *first*
thing I checked.  I haven't yet checked anything else, so I don't know
how widespread this problem is.

       Mark




Acknowledgement sent to Mark H Weaver <mhw@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-guix@HIDDEN. Full text available.
Report forwarded to bug-guix@HIDDEN:
bug#47576; Package guix. Full text available.
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