[Bug libc/5491] New: Valgrind detects invalid read during getaddrinfo w/o nscd running

[Bug libc/5491] New: Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

This is using glibc 2.7 (the entry box needs to be fixed...)

When I use getaddrinfo, valgrind detects a read of size 8 when 'nscd' is not
running.  When 'nscd' is running, it does not...
(In 32-bit mode it is an invalid read of size 4 ... so I bet its a ptr or size_t...)

Attached is a source file which demonstrates this problem.
Also attached is the 2 valgrind outputs (32 and 64-bit versions).


Details:
I'm running Gentoo Linux w/ `uname -a`:
Linux shiva 2.6.22-ck1 #6 SMP Tue Sep 25 04:53:20 EDT 2007 x86_64 AMD Athlon(tm)
64 X2 Dual Core Processor 6000+ AuthenticAMD GNU/Linux

-- 
           Summary: Valgrind detects invalid read during getaddrinfo w/o
                    nscd running
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: harningt at gmail dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: x86_64-pc-linux-gnu
  GCC host triplet: x86_64-pc-linux-gnu
GCC target triplet: x86_64-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

------- Additional Comments From harningt at gmail dot com  2007-12-17 04:28 -------
Created an attachment (id=2141)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2141&action=view)
64-bit valgrind output


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

------- Additional Comments From harningt at gmail dot com  2007-12-17 04:29 -------
Created an attachment (id=2143)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2143&action=view)
src sample which demonstrates the problem


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

------- Additional Comments From harningt at gmail dot com  2007-12-17 04:28 -------
Created an attachment (id=2142)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=2142&action=view)
32-bit valgrind output


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #2143|application/octet-stream    |text/x-csrc
          mime type|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[harningt at gmail dot com]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
   Attachment #2143|text/x-csrc                 |text/plain
          mime type|                            |


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[ismail at pardus dot org dot tr]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ismail at pardus dot org dot
                   |                            |tr
 GCC target triplet|x86_64-pc-linux-gnu         |x86_64-pc-linux-gnu


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-01-11 00:31 -------
I cannot reproduce any problem, neither in the 2.7 in F8 nor the current
mainline glibc.  You'll have to debug this yourself.  E.g., run with debug
information for glibc installed.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[drepper at redhat dot com]

------- Additional Comments From drepper at redhat dot com  2008-04-07 18:21 -------
No reply in 3 months.  If you have the requested information attach it and
reopen the bug.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |WORKSFORME


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[ry at tinyclouds dot org]

------- Additional Comments From ry at tinyclouds dot org  2009-06-10 14:12 -------
I am also experiencing this with libc 2.7-10ubuntu4 and gcc version 4.2.4 (Ubuntu 
4.2.4-1ubuntu3).

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|WORKSFORME                  |


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[pasky at suse dot cz]

------- Additional Comments From pasky at suse dot cz  2009-06-10 17:52 -------
I can't reproduce this either.

If you can, can you try to reproduce this on glibc-2.10 or the latest glibc
mainline? If not, the best course of action I think is to file the bug with your
distribution instead.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |WAITING


http://sourceware.org/bugzilla/show_bug.cgi?id=5491

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[pasky at suse dot cz]

------- Additional Comments From pasky at suse dot cz  2010-06-01 03:33 -------
no further response

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |WORKSFORME


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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[gglater62 at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=5491

--- Comment #9 from gglater62 at gmail dot com 2013-05-18 10:05:40 UTC ---
Created attachment 7034
  --> http://sourceware.org/bugzilla/attachment.cgi?id=7034
Sample code

With this sample code valgrind shows errors:
==2394== Syscall param sendmsg(mmsg[0].msg_hdr) points to uninitialised byte(s)
==2394==    at 0x41435B6: sendmmsg (in /lib/libc-2.17.so)
==2394==    by 0x4625254: __libc_res_nsend (in /lib/libresolv-2.17.so)
==2394==    by 0x462292B: __libc_res_nquery (in /lib/libresolv-2.17.so)
==2394==    by 0x4622F4C: __libc_res_nquerydomain (in /lib/libresolv-2.17.so)
==2394==    by 0x462357B: __libc_res_nsearch (in /lib/libresolv-2.17.so)
==2394==    by 0x4617605: _nss_dns_gethostbyname4_r (in
/lib/libnss_dns-2.17.so)
==2394==    by 0x412631E: gaih_inet (in /lib/libc-2.17.so)
==2394==    by 0x41292F2: getaddrinfo (in /lib/libc-2.17.so)
==2394==    by 0x8048514: do_real_lookup (in /home/users/pld/C/a.out)
==2394==    by 0x804853B: main (in /home/users/pld/C/a.out)

I looked at the code and in resolv/res_send.c around line 1115
reqs[0].msg_hdr.msg_flags and reqs[1].msg_hdr.msg_flags are not initialised.

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[Bug libc/5491] Valgrind detects invalid read during getaddrinfo w/o nscd running

[schwab@linux-m68k.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=5491

--- Comment #10 from Andreas Schwab <schwab@linux-m68k.org> 2013-05-18 10:28:05 UTC ---
msg_hdr.msg_flags is not used by sendmmsg.

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