[Bug 613662] Re: nscd doesn't cache host entries

Launchpad Bug Tracker 613662 at bugs.launchpad.net
Mon Jan 28 19:13:19 UTC 2013 

This bug was fixed in the package eglibc - 2.17-0ubuntu1

---------------
eglibc (2.17-0ubuntu1) raring; urgency=low

  * Merge with Debian, bringing in a new upstream and many small fixes:
    - patches/any/cvs-malloc-deadlock.diff: Dropped, merged upstream.
    - patches/ubuntu/lddebug-scopes.diff: Rebase for upstream changes.
    - patches/ubuntu/local-CVE-2012-3406.diff: Rebased against upstream.
    - patches/ubuntu/no-asm-mtune-i686.diff: Fixed in recent binutils.
  * This upstream merge fixes a nasty hang in pulseaudio (LP: #1085342)
  * Bump MIN_KERNEL_SUPPORTED to 2.6.32 on ARM, now that we no longer
    have to support shonky 2.6.31 kernels on imx51 babbage builders.
  * Drop patches/ubuntu/local-disable-nscd-host-caching.diff, as these
    issues were apparently resolved upstream a while ago (LP: #613662)
  * Fix the compiled-in bug URL to point to launchpad.net, not Debian.

eglibc (2.17-0experimental0) experimental; urgency=low

  [ Adam Conrad ]
  * New upstream release: version 2.17, orig tarball built at SVN r22169:
    - Restricts ld.so self-loading checks to normal mode (LP: #1088677)
    - debian/rules.d/tarball.mk: ports is no longer external to libc.
    - debian/*: Update all 2.16 occurences to 2.17 for upgrades/deps.
    - patches/localedata/supported.diff: Rebased against new upstream.
    - patches/localedata/locale-ia.diff: Dropped, merged upstream.
    - patches/localedata/submitted-es_MX-decimal_point.diff: Rebased.
    - patches/amd64/local-pthread_cond_wait.diff: Dropped, fixed upstream.
    - patches/i386/local-pthread_cond_wait.diff: Dropped (closes: #694962)
    - patches/arm64/cvs-ldconfig-cache-abi.diff: Dropped, merged upstream.
    - patches/arm64/submitted-aarch64-support.diff: Merged upstream.
    - patches/arm/cvs-ldconfig-cache-abi.diff: Dropped, merged upstream.
    - patches/arm/local-atomic.diff: Dropped, fixed differently upstream.
    - patches/arm/unsubmitted-armhf-linker.diff: Dropped, not needed.
    - patches/arm/unsubmitted-ldconfig-cache-abi.diff: Rewritten slightly.
    - patches/hppa/submitted-nptl-carlos.diff: Rebased against upstream.
    - patches/hppa/local-stack-grows-up.diff: Rebased against upstream.
    - patches/hurd-i386/local-enable-ldconfig.diff: dl-cache.c dropped.
    - patches/hurd-i386/tg-tls.diff: Rebase and drop powerpc support.
    - patches/hurd-i386/tg-regenerate_errno.h.diff: Merged upstream.
    - patches/hurd-i386/tg-extern_inline.diff: Drop powerpc support.
    - patches/hurd-i386/tg-elfosabi_gnu.diff: Drop powerpc support.
    - patches/hurd-i386/tg-grantpt.diff: Rebased against new upstream.
    - patches/hurd-i386/unsubmitted-pthread_posix-option.diff: Rebased.
    - patches/hurd-i386/submitted-getgroups.diff: Dropped, merged upstream.
    - patches/hurd-i386/submitted-getlogin_r.diff: Dropped, fixed upstream.
    - patches/hurd-i386/submitted-ptsname.diff: Dropped, merged upstream.
    - patches/hurd-i386/submitted-sendto.diff: Dropped, fixed upstream.
    - patches/hurd-i386/cvs-add-missing-includes.diff: Merged upstream.
    - patches/hurd-i386/cvs-mach-check-local-headers.sh.diff: Merged.
    - patches/hurd-i386/cvs-lremovexattr.diff: Dropped, merged upstream.
    - patches/hurd-i386/cvs-renameat.diff: Dropped, merged upstream.
    - patches/hurd-i386/cvs-mknodat.diff: Dropped, merged upstream.
    - patches/hurd-i386/cvs-llistxattr.diff: Dropped, merged upstream.
    - patches/i386/submitted-i686-timing.diff: Rebase, and fix a bug that
      was excluding dl-caller.c from shared-only-routines for rtld builds.
    - patches/m68k/cvs-syscall-arguments.diff: Dropped, merged upstream.
    - patches/powerpc/local-math-logb.diff: Rebased against new upstream.
    - patches/all/unsubmitted-autoconfupdate.diff: Dropped, not needed.
    - patches/any/local-bindresvport_blacklist.diff: Rebase with upstream.
    - patches/any/local-ldso-disable-hwcap.diff: Rebased against upstream.
    - patches/any/local-libgcc-compat-ports.diff: Rebased against upstream.
    - patches/any/local-nss-upgrade.diff: Rebased against new upstream.
    - patches/any/local-o_cloexec.diff: Rebased against new upstream.
    - patches/any/local-rtld.diff: Rebased against new upstream.
    - patches/any/submitted-popen.diff: Dropped, finally merged upstream.
    - patches/any/submitted-accept4-hidden.diff: Dropped, merged upstream.
    - patches/any/submitted-bits-fcntl_h-at.diff: Rebased against upstream.
    - patches/any/local-gai-rfc1918-scope-global.patch: Merged upstream.
    - patches/any/submitted-resolv-assert.diff: Dropped, merged upstream.
    - patches/any/local-revert-fclose-posix2008.diff: Reverted upstream.
    - patches/any/local-sunrpc-dos.diff: Dropped, different fix upstream.
    - patches/any/cvs-cxxheaders-detection[123].diff: Merged upstream.
  * debian/patches/powerpc/submitted-UAPI_ASM_POWERPC_ELF.diff: Remove,
    as this has been fixed in the 3.7 release and 3.8 kernel headers.
  * debian/sysdeps/{amd64,i386}.mk: Fix rtlddir for x32 alternate builds.
  * debian/sysdeps/{armel,armhf}.mk: Merge multilib configs from Ubuntu.
  * debian/debhelper.in/libc.preinst: Fix preinst kernel check to match
    the reality that we need >= 2.6.32, as found in squeeze/lucid/RHEL6.
  * debian/rules: Fix EGLIBC_VERSION epoch parsing breakage (LP: #929565)
  * debian/patches/any/cvs-tst-array-as-needed.diff: Fix tst-array2 and
    tst-array5 to build with --no-as-needed to prevent test regressions.
  * debian/patches/any/unsubmitted-ldso-machine-mismatch.diff: Skip past
    libraries that are built for other machines, rather than erroring.
  * debian/patches/i386/unsubmitted-quiet-ldconfig.diff: Fix ldconfig on
    x86 to stop complaining so loudly about wrong-arch libraries on path.
  * debian/{rules.d/build.mk,sysdeps/hurd*}: When the threads variable is
    not set to "yes", add --disable-nscd to the main configure options.
  * debian/patches/any/cvs-use-glibc-wchar.diff: Switch from the eglibc
    implementation of wchar.h to the cleaner glibc-2.18 implementation.
  * debian/patches/arm/local-eabi-wchar.diff: Dropped, no longer needed.
  * debian/patches/any/local-tst-dir-overlayfs.diff: Apply dirty hack to
    skip tst-dir on overlayfs, as it currently fails (see: LP #1107492)
  * debian/patches/svn-updates.diff: Bring svn-updates to revision 22169.

  [ Matthias Klose ]
  * debian/{rules,rules.d/control.mk,control.in/libc}: Allow turning off
    libc-prof arbitrarily, and disable it for arm64, which lacks support.
  * debian/rules.d/build.mk: Fix armhf multilib with WITH_BUILD_SYSROOT.

  [ Steve McIntyre ]
  * debian/patches/arm/unsubmitted-ldso-multilib.diff: Stop ld.so from
    exiting prematurely when it encounters wrong-float ABI libraries.

  [ Pino Toscano ]
  * Rebase/remove hurd-i386 patches against the new upstream version:
    - patches/hurd-i386/tg-ptrmangle.diff: Remove, obsolete.
    - patches/hurd-i386/tg-check_native.diff: Remove, obsolete.
    - patches/hurd-i386/submitted-regex_internal.diff: Fixed upstream.
    - patches/hurd-i386/local-disable-sendmmsg.diff: Fixed upstream.
    - patches/hurd-i386/unsubmitted-pthread.diff: Drop, obsolete.
    - patches/hurd-i386/unsubmitted-mremap.diff: Rebased for new upstream.
  * debian/patches/hurd-i386/local-disable-tst-xmmymm.diff: Disable test.
  * Update expected-results-i486-gnu-libc, expected-results-i686-gnu-i386,
    expected-results-i686-gnu-i686, expected-results-i686-gnu-xen.
 -- Adam Conrad <adconrad at ubuntu.com>   Thu, 10 Jan 2013 18:39:35 -0700

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

** CVE added: http://www.cve.mitre.org/cgi-
bin/cvename.cgi?name=2012-3406

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https://bugs.launchpad.net/bugs/613662

Title:
  nscd doesn't cache host entries

Status in “eglibc” package in Ubuntu:
  Fix Released
Status in “eglibc” source package in Precise:
  Fix Committed
Status in “eglibc” source package in Quantal:
  Fix Committed

Bug description:
  [Impact / Justification]
  For nscd users, the performance difference between a cached DNS lookup and a remote query can be anywhere from milliseconds to whole seconds, depending on the network and random luck.  I've already verified here today that the concerns originally raised in the upstream bug have since been fixed, and Debian also dropped this patch a while ago, we just failed to sync with them when they did.

  [Test Case]
  As stated above, I've already tested that the actual root issue that led to the patch has been resolved, so the only thing to test is that the build binaries no longer have host caching disabled in the default /etc/nscd.conf

  [Regression Potential]
  Very low to non-existent.  It's a single line change to a conffile, reverting a workaround that hasn't been needed in a long while.

  [Original Report]
  Binary package hint: nscd

  Debian (and by implication Ubuntu) are the only distros to disable
  nscd hosts caching. In most cases, it is deployed with the expectation
  to mitigate expensive lookups (eg over VPN).

  The bug cited [1] has been rejected by the core glibc developers three
  years ago as not a bug; all other distros (including Redhat EL and
  Novell SLES) have this functionality enabled. Why should we continue
  to penalise Ubuntu's performance any longer, in cases where nscd is
  deployed to improve performance?

  [1] http://sourceware.org/bugzilla/show_bug.cgi?id=4428

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