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* [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver
@ 2011-04-19 15:28 pasky at suse dot cz
2011-05-31 2:53 ` [Bug libc/12684] " drepper.fsp at gmail dot com
` (7 more replies)
0 siblings, 8 replies; 9+ messages in thread
From: pasky at suse dot cz @ 2011-04-19 15:28 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12684
Summary: Multi-request DNS lookups do not properly fall back to
secondary nameserver
Product: glibc
Version: 2.13
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: drepper.fsp@gmail.com
ReportedBy: pasky@suse.cz
Created attachment 5678
--> http://sourceware.org/bugzilla/attachment.cgi?id=5678
proposed patch
The resolver does not properly handle a case where AF_UNSPEC query is started,
two requests are therefore dispatched, and something like NOTIMP or SERVFAIL is
returned to one of them (e.g. AF_INET6). In this case, the second nameserver in
queue is not queried even though it should be. It is caused by an omission of
resplen = 0 in the appropriate branch of send_dg() - therefore, when checking
whether next nameserver should be queried, it is assumed that a proper reply
was received from the first one.
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
@ 2011-05-31 2:53 ` drepper.fsp at gmail dot com
2011-06-03 10:58 ` schwab@linux-m68k.org
` (6 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: drepper.fsp at gmail dot com @ 2011-05-31 2:53 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12684
Ulrich Drepper <drepper.fsp at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from Ulrich Drepper <drepper.fsp at gmail dot com> 2011-05-31 02:52:25 UTC ---
I agree, something is wrong. But it's a bad idea to try the next server in
case of NOTIMP replies etc for just one of the requests. Imagine all the
servers return these errors. In this case it is better to live with the one
successful answer. I added an appropriate patch.
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
2011-05-31 2:53 ` [Bug libc/12684] " drepper.fsp at gmail dot com
@ 2011-06-03 10:58 ` schwab@linux-m68k.org
2011-06-07 14:48 ` vapier at gentoo dot org
` (5 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: schwab@linux-m68k.org @ 2011-06-03 10:58 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12684
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |
--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> 2011-06-03 10:57:49 UTC ---
$ nss/getent ahosts example.com
;; res_setoptions(" debug
", "conf")..
;; debug
dots=1, statp->ndots=1, trailing_dot=0, name=example.com
;; res_nquerydomain(example.com, <Nil>, 1, 62321)
;; res_query(example.com, 1, 62321)
;; res_nmkquery(QUERY, example.com, IN, A)
;; res_nmkquery(QUERY, example.com, IN, AAAA)
;; res_send()
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 24983
;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; example.com, type = A, class = IN
;; Querying server (# 1) address = 127.0.0.1
res_send: send: Connection refused
;; got answer:
;; ns_initparse: Message too long
;; ns_initparse: Message too long
Segmentation fault
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
2011-05-31 2:53 ` [Bug libc/12684] " drepper.fsp at gmail dot com
2011-06-03 10:58 ` schwab@linux-m68k.org
@ 2011-06-07 14:48 ` vapier at gentoo dot org
2011-06-16 2:45 ` drepper.fsp at gmail dot com
` (4 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: vapier at gentoo dot org @ 2011-06-07 14:48 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12684
Mike Frysinger <vapier at gentoo dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |toolchain at gentoo dot org
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
` (2 preceding siblings ...)
2011-06-07 14:48 ` vapier at gentoo dot org
@ 2011-06-16 2:45 ` drepper.fsp at gmail dot com
2014-02-16 18:23 ` jackie.rosen at hushmail dot com
` (3 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: drepper.fsp at gmail dot com @ 2011-06-16 2:45 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=12684
Ulrich Drepper <drepper.fsp at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution| |FIXED
--- Comment #3 from Ulrich Drepper <drepper.fsp at gmail dot com> 2011-06-16 02:45:38 UTC ---
Don't reopen bugs for reasons like this. The problem was caused by the patch
but has nothing to do with the original problem. This is very much misleading.
I've added a patch to fix two typos which caused crashes.
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
` (3 preceding siblings ...)
2011-06-16 2:45 ` drepper.fsp at gmail dot com
@ 2014-02-16 18:23 ` jackie.rosen at hushmail dot com
2014-05-28 19:42 ` schwab at sourceware dot org
` (2 subsequent siblings)
7 siblings, 0 replies; 9+ messages in thread
From: jackie.rosen at hushmail dot com @ 2014-02-16 18:23 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=12684
Jackie Rosen <jackie.rosen at hushmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jackie.rosen at hushmail dot com
--- Comment #4 from Jackie Rosen <jackie.rosen at hushmail dot com> ---
*** Bug 260998 has been marked as a duplicate of this bug. ***
Seen from the domain http://volichat.com
Page where seen: http://volichat.com/adult-chat-rooms
Marked for reference. Resolved as fixed @bugzilla.
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
` (4 preceding siblings ...)
2014-02-16 18:23 ` jackie.rosen at hushmail dot com
@ 2014-05-28 19:42 ` schwab at sourceware dot org
2014-06-27 13:31 ` fweimer at redhat dot com
2014-06-27 13:35 ` fweimer at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: schwab at sourceware dot org @ 2014-05-28 19:42 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=12684
Andreas Schwab <schwab at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC|jackie.rosen at hushmail dot com |
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
` (5 preceding siblings ...)
2014-05-28 19:42 ` schwab at sourceware dot org
@ 2014-06-27 13:31 ` fweimer at redhat dot com
2014-06-27 13:35 ` fweimer at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: fweimer at redhat dot com @ 2014-06-27 13:31 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=12684
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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* [Bug libc/12684] Multi-request DNS lookups do not properly fall back to secondary nameserver
2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
` (6 preceding siblings ...)
2014-06-27 13:31 ` fweimer at redhat dot com
@ 2014-06-27 13:35 ` fweimer at redhat dot com
7 siblings, 0 replies; 9+ messages in thread
From: fweimer at redhat dot com @ 2014-06-27 13:35 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=12684
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
See Also| |https://sourceware.org/bugz
| |illa/show_bug.cgi?id=13013
--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
I believe the crash mentioned in comment #2 was also filed as bug 13013.
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end of thread, other threads:[~2014-06-27 13:35 UTC | newest]
Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
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2011-04-19 15:28 [Bug libc/12684] New: Multi-request DNS lookups do not properly fall back to secondary nameserver pasky at suse dot cz
2011-05-31 2:53 ` [Bug libc/12684] " drepper.fsp at gmail dot com
2011-06-03 10:58 ` schwab@linux-m68k.org
2011-06-07 14:48 ` vapier at gentoo dot org
2011-06-16 2:45 ` drepper.fsp at gmail dot com
2014-02-16 18:23 ` jackie.rosen at hushmail dot com
2014-05-28 19:42 ` schwab at sourceware dot org
2014-06-27 13:31 ` fweimer at redhat dot com
2014-06-27 13:35 ` fweimer at redhat dot com
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