[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

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On 2015-08-11T17:54:24+00:00 Nalin wrote:

Created attachment 1061638
gdb "where full" results, plus a couple of variables

Description of problem:
With a working hesiod configuration, and hesiod enabled for group resolution, 
multiple applications are crashing while initializing a supplemental groups 
list.

Version-Release number of selected component (if applicable):
glibc-2.21.90-21.fc23.x86_64
coreutils-8.24-2.fc23.x86_64 used to reproduce the bug

How reproducible:
Always

Steps to Reproduce:
1. cat > /etc/hesiod.conf << EOF
lhs=.hs
rhs=.devel.redhat.com
EOF
2. Add "hesiod" as a source for "group" information in /etc/nsswitch.conf.  
Mine reads "files hesiod".
3. Run "groups nalin" or similar.

Actual results:
"groups" segfaults.  I'll attach the gdb backtrace.

Expected results:
The expected groups list.

Additional info:

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/0


On 2016-02-05T14:13:21+00:00 Florian wrote:

Caused by upstream commit 2212c1420c92a33b0e0bd9a34938c9814a56c0f7.  Bug
reported upstream.  There are various ways to fix this, but which
approach is best is unclear.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/1


On 2016-02-15T11:24:29+00:00 Florian wrote:

Reproducer without changing /etc:

cat > /etc/hesiod.conf << EOF
lhs=.hs
rhs=.devel.redhat.com
EOF
HESIOD_CONFIG=hesiod.conf getent -s hesiod group 0 0

I'm reverting the upstream commit which introduced this bug.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/2


On 2016-02-16T16:08:11+00:00 Fedora wrote:

glibc-2.22-9.fc23 has been submitted as an update to Fedora 23.
https://bodhi.fedoraproject.org/updates/FEDORA-2016-0f9e9a34ce

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/3


On 2016-02-17T06:26:43+00:00 Fedora wrote:

glibc-2.22-9.fc23 has been pushed to the Fedora 23 testing repository. If 
problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: 
https://bodhi.fedoraproject.org/updates/FEDORA-2016-0f9e9a34ce

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/4


On 2016-02-17T14:20:20+00:00 Fedora wrote:

glibc-2.22-9.fc23 has been pushed to the Fedora 23 stable repository. If
problems still persist, please make note of it in this bug report.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/5


On 2016-02-17T18:48:28+00:00 Florian wrote:

Due to this change, a glibc update to the fixed versions *without* a
reboot (or process restart) may cause name resolution failures.

Reply at:
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/comments/6


** Changed in: glibc (Fedora)
   Status: Unknown => Fix Released

** Changed in: glibc (Fedora)
   Importance: Unknown => Undecided

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Title:
  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

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** Changed in: glibc (Debian)
   Status: Confirmed => Fix Released

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Launchpad Bug Tracker]

This bug was fixed in the package glibc - 2.23-0ubuntu4

---
glibc (2.23-0ubuntu4) xenial; urgency=medium

  * debian/rules.d/tarball.mk: Apply --no-renames to make the diff readable.
  * debian/patches/git-updates.diff: Update from release/2.23/master branch:
- Include fix for potential makecontext() hang on ARMv7 (CVE-2016-6323)
- Include fix for SEGV in sock_eq with nss_hesiod module (LP: #1571456)
- Include malloc fixes, addressing multithread deadlocks (LP: #1630302)
- debian/patches/hurd-i386/cvs-libpthread.so.diff: Dropped, upstreamed.
- debian/patches/any/submitted-argp-attribute.diff: Dropped, upstreamed.
- debian/patches/hurd-i386/tg-hurdsig-fixes-2.diff: Rebased to upstream.
  * debian/patches/ubuntu/local-altlocaledir.diff: Updated to latest version
from Martin that limits scope to LC_MESSAGES, fixing segv (LP: #1577460)
  * debian/patches/any/cvs-cos-precision.diff: Fix cos() bugs (LP: #1614966)
  * debian/testsuite-xfail-debian.mk: Allow nptl/tst-signal6 to fail on ARM.

 -- Adam Conrad   Fri, 14 Oct 2016 00:00:34 -0600

** Changed in: glibc (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-6323

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Title:
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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Ken Baker]

Verified that the 2.23-0ubuntu4 binaries in xenial-proposed resolve this
issue for me on both armhf and amd64.

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Title:
  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Adam Conrad]

Verified that the 2.23-0ubuntu4 binaries in xenial-proposed resolve this
issue.

** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Andy Whitcroft]

Hello Anders, or anyone else affected,

Accepted glibc into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/glibc/2.23-0ubuntu4 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed.  Your feedback will aid us getting this update
out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Changed in: glibc (Ubuntu Xenial)
   Status: Triaged => Fix Committed

** Tags added: verification-needed

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Adam Conrad]

** Changed in: glibc (Ubuntu Xenial)
 Assignee: (unassigned) => Adam Conrad (adconrad)

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Alberto Salvia Novella]

** Changed in: glibc (Ubuntu)
   Importance: Medium => High

** Changed in: glibc (Ubuntu Xenial)
   Importance: Medium => High

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

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** Changed in: glibc (Debian)
   Status: Fix Released => Confirmed

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Title:
  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Tom Yu]

** Description changed:

  [Impact]
  
  The nss_hesiod nsswitch module, which worked in previous releases, does
  not work at all in Ubuntu 16.04.  Enabling it causes NULL pointer
- dereferences in calls such as getpwuid().
+ dereferences in calls such as getpwuid().  This will prevent any user
+ logins from succeeding in our environment of hundreds of workstations,
+ which in turn blocks us from upgrading from 14.04 to 16.04.
  
  [Test Case]
  
  # sed -i 's/passwd: *compat/& hesiod/' /etc/nsswitch.conf
  # cat > /etc/hesiod.conf <:cmp
%dx,(%rax)
   PC (0x7fef32217a88) ok
   source "%dx" ok
   destination "(%rax)" (0x) not located in a known VMA region (needed 
writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: coreutils
  StacktraceTop:
   sock_eq (a2=0x0, a1=0x7fef33b9daf4 <_res+20>) at res_send.c:1584
   __libc_res_nsend (statp=0x7fef33b9dae0 <_res>, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=45, buf2=buf2@entry=0x0, buflen2=buflen2@entry=0, 
ans=ans@entry=0x7ffd88e80d10 " you want.  Don't add spaces after the\n", 
anssiz=1024, ansp=0x0, ansp2=0x0, nansp2=0x0, resplen2=0x0, ansp2_malloced=0x0) 
at res_send.c:408
   __GI___res_nsend (statp=, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=, ans=ans@entry=0x7ffd88e80d10 " you want.  
Don't add spaces after the\n", anssiz=anssiz@entry=1024) at res_send.c:630
   get_txt_records (class=1, name=name@entry=0xff3dd0 
"39270.uid.ns.athena.mit.edu", ctx=0xff27e0) at hesiod.c:374
   hesiod_resolve (context=context@entry=0xff27e0, 
name=name@entry=0x7ffd88e81190 "39270", type=type@entry=0x7fef3242a486 "uid") 
at hesiod.c:240
  Title: id crashed with SIGSEGV in sock_eq()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip libvirtd lpadmin plugdev sambashare 
sbuild sudo wireshark

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

This is still awaiting sponsorship of one of these patches to xenial-
proposed.

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

** Tags added: patch-accepted-debian patch-accepted-upstream

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Luke Faraone]

** Changed in: glibc (Ubuntu Xenial)
   Status: Confirmed => Triaged

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

Thanks Ken.  I believe that either patch is ready to be uploaded to
xenial-proposed (the smaller patch would just need the changelog version
adjusted).  I’d really appreciate any feedback from sponsors here; if
you’d prefer something else in between the extremes of a targeted patch
fixing just this problem and a wholesale update from the upstream stable
branch, I am happy to help out in whatever way is most likely to get
this fixed quickly.

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Ken Baker]

@Anders,

I have taken your patch (glibc_2.23-0ubuntu3_stable-updates.debdiff),
applied it, and built a version on armhf and so far it works.

Thank you!

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Mathew Hodson]

** Changed in: glibc (Ubuntu Xenial)
   Importance: Undecided => Medium

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

** Changed in: glibc (Ubuntu)
   Status: Triaged => Fix Released

** Changed in: glibc (Ubuntu Xenial)
   Status: New => Confirmed

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

If you want to fix this by pulling in the upstream 2.23 stable branch,
here is a debdiff for that.  I verified that debian/patches/git-
updates.diff contains the output of ‘git diff glibc-2.23
glibc-2.23-21-g146b58d’, replaced it with the output of ‘git diff
glibc-2.23 glibc-2.23-71-gbbe472f’ (minus the manual directory, which
was removed from the source package), and resolved a trivial patch
conflict.

There are some other important fixes there, including CVE-2016-1234,
CVE-2016-3706, and CVE-2016-4429.

There’s a test build in ppa:anders-kaseorg/ppa.

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-1234

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-3706

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2016-4429

** Patch added: "glibc_2.23-0ubuntu3_stable-updates.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/+attachment/4705213/+files/glibc_2.23-0ubuntu3_stable-updates.debdiff

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[C de-Avillez]

** Also affects: glibc (Ubuntu Xenial)
   Importance: Undecided
   Status: New

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

This was fixed in yakkety’s libc6 2.23-1ubuntu1.  We are still waiting
for a xenial SRU.

** Description changed:

- To reproduce:
+ [Impact]
  
- sed -i 's/passwd: *compat/& hesiod/' /etc/nsswitch.conf
- cat > /etc/hesiod.conf < /etc/hesiod.conf :cmp
%dx,(%rax)
-  PC (0x7fef32217a88) ok
-  source "%dx" ok
-  destination "(%rax)" (0x) not located in a known VMA region (needed 
writable region)!
+  Segfault happened at: 0x7fef32217a88 <__libc_res_nsend+3192>:cmp
%dx,(%rax)
+  PC (0x7fef32217a88) ok
+  source "%dx" ok
+  destination "(%rax)" (0x) not located in a known VMA region (needed 
writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: coreutils
  StacktraceTop:
-  sock_eq (a2=0x0, a1=0x7fef33b9daf4 <_res+20>) at res_send.c:1584
-  __libc_res_nsend (statp=0x7fef33b9dae0 <_res>, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=45, buf2=buf2@entry=0x0, buflen2=buflen2@entry=0, 
ans=ans@entry=0x7ffd88e80d10 " you want.  Don't add spaces after the\n", 
anssiz=1024, ansp=0x0, ansp2=0x0, nansp2=0x0, resplen2=0x0, ansp2_malloced=0x0) 
at res_send.c:408
-  __GI___res_nsend (statp=, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=, ans=ans@entry=0x7ffd88e80d10 " you want.  
Don't add spaces after the\n", anssiz=anssiz@entry=1024) at res_send.c:630
-  get_txt_records (class=1, name=name@entry=0xff3dd0 
"39270.uid.ns.athena.mit.edu", ctx=0xff27e0) at hesiod.c:374
-  hesiod_resolve (context=context@entry=0xff27e0, 
name=name@entry=0x7ffd88e81190 "39270", type=type@entry=0x7fef3242a486 "uid") 
at hesiod.c:240
+  sock_eq (a2=0x0, a1=0x7fef33b9daf4 <_res+20>) at res_send.c:1584
+  __libc_res_nsend (statp=0x7fef33b9dae0 <_res>, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=45, buf2=buf2@entry=0x0, buflen2=buflen2@entry=0, 
ans=ans@entry=0x7ffd88e80d10 " you want.  Don't add spaces after the\n", 
anssiz=1024, ansp=0x0, ansp2=0x0, nansp2=0x0, resplen2=0x0, ansp2_malloced=0x0) 
at res_send.c:408
+  __GI___res_nsend (statp=, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=, ans=ans@entry=0x7ffd88e80d10 " you want.  
Don't add spaces after the\n", anssiz=anssiz@entry=1024) at res_send.c:630
+  get_txt_records (class=1, name=name@entry=0xff3dd0 
"39270.uid.ns.athena.mit.edu", ctx=0xff27e0) at hesiod.c:374
+  hesiod_resolve (context=context@entry=0xff27e0, 
name=name@entry=0x7ffd88e81190 "39270", type=type@entry=0x7fef3242a486 "uid") 
at hesiod.c:240
  Title: id crashed with SIGSEGV in sock_eq()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip libvirtd lpadmin plugdev sambashare 
sbuild sudo wireshark

** Description changed:

  [Impact]
  
  The nss_hesiod nsswitch module, which worked in previous releases, does
  not work at all in Ubuntu 16.04.  Enabling it causes NULL pointer
  dereferences in calls such as getpwuid().
  
  [Test Case]
  
  # sed -i 's/passwd: *compat/& hesiod/' /etc/nsswitch.conf
  # cat > /etc/hesiod.conf <:cmp
%dx,(%rax)
   PC (0x7fef32217a88) ok
   source "%dx" ok
   destination "(%rax)" (0x) not located in a known VMA region (needed 
writable region)!
  SegvReason: writing NULL VMA
  Signal: 11
  SourcePackage: coreutils
  StacktraceTop:
   sock_eq (a2=0x0, a1=0x7fef33b9daf4 <_res+20>) at res_send.c:1584
   __libc_res_nsend (statp=0x7fef33b9dae0 <_res>, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=45, buf2=buf2@entry=0x0, buflen2=buflen2@entry=0, 
ans=ans@entry=0x7ffd88e80d10 " you want.  Don't add spaces after the\n", 
anssiz=1024, ansp=0x0, ansp2=0x0, nansp2=0x0, resplen2=0x0, ansp2_malloced=0x0) 
at res_send.c:408
   __GI___res_nsend (statp=, buf=buf@entry=0x7ffd88e80910 
"@\267\001", buflen=, ans=ans@entry=0x7ffd88e80d10 

[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Ken Baker]

Are there any updates on the status of this?

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Title:
  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

Upstream backports:

master: 5018f16c6205404ba3aa7298dc8a3d45fbd46bfc
2.23: 2d1f6790183dabf54c5b05be97d3872dab720c83
2.22: a64be6fb2f1317ce7039a4bb8638bd0c30c31e28

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Title:
  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

It happened upstream.  What are we waiting for now?

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  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Michael Hudson-Doyle]

Unsubscribing sponsors as it looks like this is going to happen via
upstream.

** Changed in: glibc (Ubuntu)
 Assignee: (unassigned) => Adam Conrad (adconrad)

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Mathew Hodson]

** Changed in: glibc (Ubuntu)
   Status: Confirmed => Triaged

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Bug Watch Updater]

** Changed in: glibc (Debian)
   Status: Confirmed => Fix Released

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

This was fixed in glibc master by ripping out the affected code. Either
strategy is fine.

https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=5018f16c6205404ba3aa7298dc8a3d45fbd46bfc

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Adam Conrad]

As soon as you get this committed to glibc master, I'll backport it to
the 2.23 branch and pull it into the first xenial SRU.

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Ubuntu Foundations Team Bug Bot]

The attachment "glibc_2.23-0ubuntu3_lp1571456.debdiff" seems to be a
debdiff.  The ubuntu-sponsors team has been subscribed to the bug report
so that they can review and hopefully sponsor the debdiff.  If the
attachment isn't a patch, please remove the "patch" flag from the
attachment, remove the "patch" tag, and if you are member of the
~ubuntu-sponsors, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

** Patch removed: "glibc_2.23-0ubuntu3_lp1571456.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/+attachment/4648373/+files/glibc_2.23-0ubuntu3_lp1571456.debdiff

** Patch added: "glibc_2.23-0ubuntu3_lp1571456.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/+attachment/4648414/+files/glibc_2.23-0ubuntu3_lp1571456.debdiff

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  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

Here’s a debdiff adding the patch I submitted to the glibc mailing list
(https://sourceware.org/ml/libc-alpha/2016-04/msg00563.html). Unlike the
Fedora revert, this only touches nss_hesiod, which is completely
unusable without the fix. So it should be very low risk.

** Patch added: "glibc_2.23-0ubuntu3_lp1571456.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1571456/+attachment/4648373/+files/glibc_2.23-0ubuntu3_lp1571456.debdiff

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  id crashed with SIGSEGV in sock_eq()

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: glibc (Ubuntu)
   Status: New => Confirmed

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Bug Watch Updater]

** Changed in: glibc (Debian)
   Status: Unknown => Confirmed

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[Bug 1571456] Re: id crashed with SIGSEGV in sock_eq()

[Anders Kaseorg]

** Bug watch added: Debian Bug tracker #821358
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821358

** Also affects: glibc (Debian) via
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821358
   Importance: Unknown
   Status: Unknown

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