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glibc/glibc-resolv-reload.diff
Andreas Schwab 746e16d2b9 Accepting request 186119 from home:Andreas_Schwab:glibc 
- Update to glibc 2.17.90 85891acadf1b:
  * CVE-2013-2207 Incorrectly granting access to another user's pseudo-terminal
    has been fixed by disabling the use of pt_chown (Bugzilla #15755).
    Distributions can re-enable building and using pt_chown via the new configure
    option `--enable-pt_chown'.  Enabling the use of pt_chown carries with it
    considerable security risks and should only be used if the distribution
    understands and accepts the risks.
  * CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
    #15078).
  * CVE-2013-1914 Stack overflow in getaddrinfo with many results has been
    fixed (Bugzilla #15330).
  * Add support for calling C++11 thread_local object destructors on thread
    and program exit.  This needs compiler support for offloading C++11
    destructor calls to glibc.
  * Improved worst case performance of libm functions with double inputs and
    output.
  * Support for priority inherited mutexes in pthread condition variables on
    non-x86 architectures.
  * Optimized string functions for AArch64.  Implemented by Marcus Shawcroft.
  * Optimized string functions for ARM.  Implemented by Will Newton and
    Richard Henderson.
  * Added a benchmark framework to track performance of functions in glibc.
  * New <math.h> macro named issignaling to check for a signaling NaN (sNaN).
    It is based on draft TS 18661 and currently enabled as a GNU extension.
  * On Linux, the clock function now uses the clock_gettime system call
    for improved precision, rather than old times system call.
  * Added new API functions pthread_getattr_default_np and
    pthread_setattr_default_np to get and set the default pthread
    attributes of a process.
  * Added support for TSX lock elision for pthread mutexes on i386 and x86-64.

OBS-URL: https://build.opensuse.org/request/show/186119
OBS-URL: https://build.opensuse.org/package/show/Base:System/glibc?expand=0&rev=304
2013-08-06 14:52:55 +00:00

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From libc-alpha-return-22754-pasky=ucw.cz@sourceware.org Tue Mar 16 00:47:00 2010
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Date: Mon, 15 Mar 2010 18:23:06 +0100
From: Sebastian Kienzl <seb@riot.org>
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To: libc-alpha@sourceware.org
Subject: Reloading of /etc/resolv.conf
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--------------060407080409020101000002
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Hello!
There's a patch in the wild against the resolver which makes it reload
/etc/resolv.conf on change, see
http://sources.redhat.com/ml/libc-alpha/2004-09/msg00130.html
However, this patch actually doesn't work properly for multi-threaded
programs, as only one thread will notice the change and refresh its
resolver state. I've attached a proper patch. It's for 2.5 but it should
work with current versions, too.
Even though the patch may not be interesting for upstream, I decided to
let you know about this problem, since the mentioned patch seems to be
used by at least Debian and Ubuntu.
Regards,
Seb.
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filename="glibc-2.5-resolvconf.patch"
Index: glibc-2.17.90/resolv/res_libc.c
===================================================================
--- glibc-2.17.90.orig/resolv/res_libc.c
+++ glibc-2.17.90/resolv/res_libc.c
@@ -22,7 +22,7 @@
#include <arpa/nameser.h>
#include <resolv.h>
#include <bits/libc-lock.h>
-
+#include <sys/stat.h>
/* The following bit is copied from res_data.c (where it is #ifdef'ed
out) since res_init() should go into libc.so but the rest of that
@@ -89,12 +89,34 @@ res_init(void) {
return (__res_vinit(&_res, 1));
}
+static time_t resconf_mtime;
+__libc_lock_define_initialized (static, resconf_mtime_lock);
+
+/* Check if the modification time of resolv.conf has changed.
+ If so, have all threads re-initialize their resolver states */
+static void
+__res_check_resconf (void)
+{
+ struct stat statbuf;
+ if (stat (_PATH_RESCONF, &statbuf) == 0) {
+ __libc_lock_lock (resconf_mtime_lock);
+ if (statbuf.st_mtime != resconf_mtime) {
+ resconf_mtime = statbuf.st_mtime;
+ atomicinclock (lock);
+ atomicinc (__res_initstamp);
+ atomicincunlock (lock);
+ }
+ __libc_lock_unlock (resconf_mtime_lock);
+ }
+}
+
/* Initialize resp if RES_INIT is not yet set or if res_init in some other
thread requested re-initializing. */
int
__res_maybe_init (res_state resp, int preinit)
{
if (resp->options & RES_INIT) {
+ __res_check_resconf ();
if (__res_initstamp != resp->_u._ext.initstamp) {
if (resp->nscount > 0)
__res_iclose (resp, true);
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