[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Bug#800523: marked as done (nscd netgroup cache occasionally not updated, nscd -i netgroup hangs)

Your message dated Fri, 01 Jan 2016 15:47:08 +0000
with message-id <E1aF1v2-00011E-Sr@franck.debian.org>
and subject line Bug#800523: fixed in glibc 2.19-18+deb8u2
has caused the Debian Bug report #800523,
regarding nscd netgroup cache occasionally not updated, nscd -i netgroup hangs
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.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org

800523: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=800523
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
Package: nscd
Severity: important
Version: 2.19-18+deb8u1
Tags: patch
Usertags: debian-edu
User: debian-edu@lists.debian.org
X-Debbugs-Cc: debian-edu@lists.debian.org

Dear maintainers,

the Debian Edu main server in jessie heavily relies on working netgroups code in glibc / nscd for allowing NFS access from hosts on the network.

The setup is:


netgroup:    files ldap

The LDAP nss provider is libnss-ldapd via nslcd. NIS netgroups are only configured in LDAP, no local /etc/netgroup file is present. NIS netgroup caching in nscd.conf is enabled.

In some cases (unclear what triggers it) the following is observed:

  o add a new host to the NIS netgroup "workstation-hosts"
  o wait for a while (i.e., we even tried days...)
o "getent netgroup workstation-hosts" does not list the new host as netgroup member
  o trying

    $ innetgr -h <recently-added-host> workstation-hosts || echo FALSE

    echoes "FALSE" on the terminal.
o sometimes there even is a difference between what getent netgroup <netgroup> gives as a result and what innetgr returns as a result (a host tripled is listed in
    getent netgroup <netgroup>, but when querying for that host via innetgr).
  o Attempting cache clean-up (nscd -i netgroup) fails, the command hangs and
    does not return to a command prompt

The behaviour occurs very often on Debian Edu jessie main server installations (and also on a vanilla Debian jessie server using a similar NIS netgroup / NFS setup). It does not occur always. Note, that I always have host netgroups that are full with host triplets (long strings!!! several lines on a normal 80x25 terminal).

From looking at debdiffs between glibc in unstable and jessie (2.19-18+deb8u1), the issue is probably also present in Debian unstable, but may have been fixed in glibc 2.21 (currently in experimental).

The debdiff between glibc in wheezy (2.13-38+deb7u8) and jessie (2.19-18+deb8u1) alludes that the changes around the netgroup caching code (there have been quite some nscd caching changes between those two version) may have caused this issue between glibc 2.13 and 2.19.

The above issue is definitely not present in glibc from Debian squeeze (we have many servers running that versions) and probably neither present in Debian wheezy (only one test server deployed), but really really bites us (the Debian Edu team) on Debian Edu jessie.

The workaround at the moment is: disable nscd netgroup caching in nscd.conf. This is by far suboptimal.

Upstream observed issues with (LDAP and) netgroup caching, as well, recently:

Patch: https://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=c3ec475c5dd16499aa040908e11d382c3ded9692;hp=aa2f176d6f75b86b91e544c2e494066ac8f88cbd

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=dd3022d75e6fb8957843d6d84257a5d8457822d5 https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ea7d8b95e2fcb81f68b04ed7787a3dbda023991a

  https://sourceware.o rg/bugzilla/show_bug.cgi?id=16695

  https://sourceware.o rg/bugzilla/show_bug.cgi?id=16758

Especially BZ #16878 looks like being a good candidate to fix this. My recommendation is considering backporting all of the above patches as by reading those bug reports, glibc 2.19 seems quite buggy regarding netgroup caching in nscd.



mike gabriel, herweg 7, 24357 fleckeby
fon: +49 (1520) 1976 148

GnuPG Key ID 0x25771B31
mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de


Attachment: pgpz0XfoCmua0.pgp
Description: Digitale PGP-Signatur

--- End Message ---
--- Begin Message ---
Source: glibc
Source-Version: 2.19-18+deb8u2

We believe that the bug you reported is fixed in the latest version of
glibc, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 800523@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
Aurelien Jarno <aurel32@debian.org> (supplier of updated glibc package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)

Hash: SHA1

Format: 1.8
Date: Mon, 28 Dec 2015 21:39:40 +0100
Source: glibc
Binary: libc-bin libc-dev-bin glibc-doc glibc-source locales locales-all nscd multiarch-support libc6 libc6-dev libc6-dbg libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-pic libc0.1-udeb libc6-i386 libc6-dev-i386 libc6-sparc libc6-dev-sparc libc6-sparc64 libc6-dev-sparc64 libc6-s390 libc6-dev-s390 libc6-amd64 libc6-dev-amd64 libc6-powerpc libc6-dev-powerpc libc6-ppc64 libc6-dev-ppc64 libc6-mips32 libc6-dev-mips32 libc6-mipsn32 libc6-dev-mipsn32 libc6-mips64 libc6-dev-mips64 libc0.1-i386 libc0.1-dev-i386 libc6-x32 libc6-dev-x32 libc6-i686 libc6-xen libc0.1-i686 libc0.3-i686 libc0.3-xen libc6.1-alphaev67 libc6-loongson2f libnss-dns-udeb libnss-files-udeb
Architecture: source all
Version: 2.19-18+deb8u2
Distribution: stable
Urgency: medium
Maintainer: Aurelien Jarno <aurel32@debian.org>
Changed-By: Aurelien Jarno <aurel32@debian.org>
 glibc-doc  - GNU C Library: Documentation
 glibc-source - GNU C Library: sources
 libc-bin   - GNU C Library: Binaries
 libc-dev-bin - GNU C Library: Development binaries
 libc0.1    - GNU C Library: Shared libraries
 libc0.1-dbg - GNU C Library: detached debugging symbols
 libc0.1-dev - GNU C Library: Development Libraries and Header Files
 libc0.1-dev-i386 - GNU C Library: 32bit development libraries for AMD64
 libc0.1-i386 - GNU C Library: 32bit shared libraries for AMD64
 libc0.1-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc0.1-pic - GNU C Library: PIC archive library
 libc0.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc0.3    - GNU C Library: Shared libraries
 libc0.3-dbg - GNU C Library: detached debugging symbols
 libc0.3-dev - GNU C Library: Development Libraries and Header Files
 libc0.3-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc0.3-pic - GNU C Library: PIC archive library
 libc0.3-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc0.3-xen - GNU C Library: Shared libraries [Xen version]
 libc6      - GNU C Library: Shared libraries
 libc6-amd64 - GNU C Library: 64bit Shared libraries for AMD64
 libc6-dbg  - GNU C Library: detached debugging symbols
 libc6-dev  - GNU C Library: Development Libraries and Header Files
 libc6-dev-amd64 - GNU C Library: 64bit Development Libraries for AMD64
 libc6-dev-i386 - GNU C Library: 32-bit development libraries for AMD64
 libc6-dev-mips32 - GNU C Library: o32 Development Libraries for MIPS
 libc6-dev-mips64 - GNU C Library: 64bit Development Libraries for MIPS64
 libc6-dev-mipsn32 - GNU C Library: n32 Development Libraries for MIPS64
 libc6-dev-powerpc - GNU C Library: 32bit powerpc development libraries for ppc64
 libc6-dev-ppc64 - GNU C Library: 64bit Development Libraries for PowerPC64
 libc6-dev-s390 - GNU C Library: 32bit Development Libraries for IBM zSeries
 libc6-dev-sparc - GNU C Library: 32bit Development Libraries for SPARC
 libc6-dev-sparc64 - GNU C Library: 64bit Development Libraries for UltraSPARC
 libc6-dev-x32 - GNU C Library: X32 ABI Development Libraries for AMD64
 libc6-i386 - GNU C Library: 32-bit shared libraries for AMD64
 libc6-i686 - GNU C Library: Shared libraries [i686 optimized]
 libc6-loongson2f - GNU C Library: Shared libraries (Loongson 2F optimized)
 libc6-mips32 - GNU C Library: o32 Shared libraries for MIPS
 libc6-mips64 - GNU C Library: 64bit Shared libraries for MIPS64
 libc6-mipsn32 - GNU C Library: n32 Shared libraries for MIPS64
 libc6-pic  - GNU C Library: PIC archive library
 libc6-powerpc - GNU C Library: 32bit powerpc shared libraries for ppc64
 libc6-ppc64 - GNU C Library: 64bit Shared libraries for PowerPC64
 libc6-s390 - GNU C Library: 32bit Shared libraries for IBM zSeries
 libc6-sparc - GNU C Library: 32bit Shared libraries for SPARC
 libc6-sparc64 - GNU C Library: 64bit Shared libraries for UltraSPARC
 libc6-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libc6-x32  - GNU C Library: X32 ABI Shared libraries for AMD64
 libc6-xen  - GNU C Library: Shared libraries [Xen version]
 libc6.1    - GNU C Library: Shared libraries
 libc6.1-alphaev67 - GNU C Library: Shared libraries (EV67 optimized)
 libc6.1-dbg - GNU C Library: detached debugging symbols
 libc6.1-dev - GNU C Library: Development Libraries and Header Files
 libc6.1-pic - GNU C Library: PIC archive library
 libc6.1-udeb - GNU C Library: Shared libraries - udeb (udeb)
 libnss-dns-udeb - GNU C Library: NSS helper for DNS - udeb (udeb)
 libnss-files-udeb - GNU C Library: NSS helper for files - udeb (udeb)
 locales    - GNU C Library: National Language (locale) data [support]
 locales-all - GNU C Library: Precompiled locale data
 multiarch-support - Transitional package to ensure multiarch compatibility
 nscd       - GNU C Library: Name Service Cache Daemon
Closes: 779587 798316 798515 799966 800523 800574 801691 802256 803927
 glibc (2.19-18+deb8u2) stable; urgency=medium
   [ Aurelien Jarno ]
   * Update from upstream stable branch:
     - Fix getaddrinfo sometimes returning uninitialized data with nscd.
       Closes: #798515.
     - Fix data corruption while reading the NSS files database
       (CVE-2015-5277).  Closes: #799966.
     - Fix buffer overflow (read past end of buffer) in internal_fnmatch.
     - Fix  _IO_wstr_overflow integer overflow.
     - Fix unexpected closing of nss_files databases after lookups,
       causing denial of service (CVE-2014-8121).  Closes: #779587.
     - Fix NSCD netgroup cache.  Closes: #800523.
   * patches/any/cvs-ld_pointer_guard.diff: new patch from upstream to
     unconditionally disable LD_POINTER_GUARD.  Closes: #798316, #801691.
   * patches/any/cvs-mangle-tls_dtor_list.diff: new patch from upstream to
     mangle function pointers in tls_dtor_list.  Closes: #802256.
   * patches/any/cvs-strxfrm-buffer-overflows.diff: new patch from upstream
     to fix memory allocations issues that can lead to buffer overflows on
     the stack.  Closes: #803927.
   [ Henrique de Moraes Holschuh ]
   * Replace patches/amd64/local-blacklist-on-TSX-Haswell.diff by
     local-blacklist-for-Intel-TSX.diff also blacklisting some Broadwell
     models.  Closes: #800574.
 e4386b9b316fb3366323a25c5626df580b3dd100 8236 glibc_2.19-18+deb8u2.dsc
 9a766804327f12ab4424afab959c97d930421f1a 1040948 glibc_2.19-18+deb8u2.debian.tar.xz
 bbf48a19e71e8c9367d8514ff2e1131d34f0134e 2267136 glibc-doc_2.19-18+deb8u2_all.deb
 35528d07531cc05b48fe0a3405de48e2ab91491b 13976542 glibc-source_2.19-18+deb8u2_all.deb
 0b0f9e53d313deb1965e7994c386b5384be66bc2 3954372 locales_2.19-18+deb8u2_all.deb
 f87e7448c2e460aac9b1a420469b7848b057a5d4e9f716b26d0277446eabac13 8236 glibc_2.19-18+deb8u2.dsc
 0e407d1610ba95adfe641d7030ddac13105682f638cf8ff1286dfd1c44d24aa3 1040948 glibc_2.19-18+deb8u2.debian.tar.xz
 24366700536fe92feb1570b5ce733d09fac4d1956a5904e330ad7bb642a2a167 2267136 glibc-doc_2.19-18+deb8u2_all.deb
 b940f7c54a40513b5915ff6534b89d5f6b2154c2e78980bfe37b08264f55f90d 13976542 glibc-source_2.19-18+deb8u2_all.deb
 e7694d8bfafffbf78b3ebb79f9e3218d699f0e13b761e1f4c7848705eebc9fe2 3954372 locales_2.19-18+deb8u2_all.deb
 645a3775c11f5c216a25683b37db0f80 8236 libs required glibc_2.19-18+deb8u2.dsc
 f7c75b3bdf661a84abf51420f15b6933 1040948 libs required glibc_2.19-18+deb8u2.debian.tar.xz
 80e5c2d6537a71b13c549f628e2fdf71 2267136 doc optional glibc-doc_2.19-18+deb8u2_all.deb
 fa2a8d49a5d97782a4f17aaea6edb642 13976542 devel optional glibc-source_2.19-18+deb8u2_all.deb
 f3090452ea4d882d1891f265b90a5979 3954372 localization standard locales_2.19-18+deb8u2_all.deb
Package-Type: udeb

Version: GnuPG v1


--- End Message ---

Reply to: