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* [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function
@ 2015-03-23 19:40 sourceware-bugs at internot dot info
2015-03-23 20:10 ` [Bug libc/18156] " sourceware-bugs at internot dot info
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: sourceware-bugs at internot dot info @ 2015-03-23 19:40 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
Bug ID: 18156
Summary: getaddrinfo race condition in 'reopen' function
Product: glibc
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: sourceware-bugs at internot dot info
CC: drepper.fsp at gmail dot com
Per https://sourceware.org/ml/libc-help/2015-03/msg00055.html
"The bug should say that this is a benign race that needs fixing."
There is a benign(non-"important") race condition in the resolv component of
glibc.
In res_send.c:
#ifndef __ASSUME_SOCK_CLOEXEC
static int __have_o_nonblock;
#else
# define __have_o_nonblock 0
#endif
However, also in res_send.c, in the 'reopen' function:
if (__have_o_nonblock == 0)
__have_o_nonblock
= (EXT(statp).nssocks[ns] == -1
&& errno == EINVAL ? -1 : 1);
'reopen' is called in threads.
Here is a valgrind(drd) output: http://pastebin.com/VhdwRkUx
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* [Bug libc/18156] getaddrinfo race condition in 'reopen' function
2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
@ 2015-03-23 20:10 ` sourceware-bugs at internot dot info
2015-03-23 21:54 ` joseph at codesourcery dot com
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: sourceware-bugs at internot dot info @ 2015-03-23 20:10 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
--- Comment #1 from Joshua Rogers <sourceware-bugs at internot dot info> ---
Also, this particular race condition happens in my code between
getXXbyYY_r.c:266
and
getXXbyYY_r.c:281
per the manual:
http://valgrind.org/docs/manual/drd-manual.html#drd-manual.data-races
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* [Bug libc/18156] getaddrinfo race condition in 'reopen' function
2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
2015-03-23 20:10 ` [Bug libc/18156] " sourceware-bugs at internot dot info
@ 2015-03-23 21:54 ` joseph at codesourcery dot com
2015-03-24 14:13 ` schwab@linux-m68k.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: joseph at codesourcery dot com @ 2015-03-23 21:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
--- Comment #2 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
__ASSUME_SOCK_CLOEXEC is always defined for Linux, so the only current
configuration this could possibly affect is Hurd.
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* [Bug libc/18156] getaddrinfo race condition in 'reopen' function
2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
2015-03-23 20:10 ` [Bug libc/18156] " sourceware-bugs at internot dot info
2015-03-23 21:54 ` joseph at codesourcery dot com
@ 2015-03-24 14:13 ` schwab@linux-m68k.org
2015-06-05 9:48 ` fweimer at redhat dot com
2015-08-22 20:40 ` [Bug network/18156] " jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: schwab@linux-m68k.org @ 2015-03-24 14:13 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> ---
Every thread will always write the same value.
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* [Bug libc/18156] getaddrinfo race condition in 'reopen' function
2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
` (2 preceding siblings ...)
2015-03-24 14:13 ` schwab@linux-m68k.org
@ 2015-06-05 9:48 ` fweimer at redhat dot com
2015-08-22 20:40 ` [Bug network/18156] " jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: fweimer at redhat dot com @ 2015-06-05 9:48 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fweimer at redhat dot com
Flags| |security-
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* [Bug network/18156] getaddrinfo race condition in 'reopen' function
2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
` (3 preceding siblings ...)
2015-06-05 9:48 ` fweimer at redhat dot com
@ 2015-08-22 20:40 ` jsm28 at gcc dot gnu.org
4 siblings, 0 replies; 6+ messages in thread
From: jsm28 at gcc dot gnu.org @ 2015-08-22 20:40 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=18156
Joseph Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libc |network
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end of thread, other threads:[~2015-08-22 20:40 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2015-03-23 19:40 [Bug libc/18156] New: getaddrinfo race condition in 'reopen' function sourceware-bugs at internot dot info
2015-03-23 20:10 ` [Bug libc/18156] " sourceware-bugs at internot dot info
2015-03-23 21:54 ` joseph at codesourcery dot com
2015-03-24 14:13 ` schwab@linux-m68k.org
2015-06-05 9:48 ` fweimer at redhat dot com
2015-08-22 20:40 ` [Bug network/18156] " jsm28 at gcc dot gnu.org
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