Andreas Schwab
746e16d2b9
- 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
123 lines
4.5 KiB
Diff
123 lines
4.5 KiB
Diff
From libc-alpha-return-22754-pasky=ucw.cz@sourceware.org Tue Mar 16 00:47:00 2010
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Message-ID: <4B9E6CFA.7020002@riot.org>
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Date: Mon, 15 Mar 2010 18:23:06 +0100
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From: Sebastian Kienzl <seb@riot.org>
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User-Agent: Thunderbird 2.0.0.23 (Windows/20090812)
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MIME-Version: 1.0
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To: libc-alpha@sourceware.org
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Subject: Reloading of /etc/resolv.conf
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boundary="------------060407080409020101000002"
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Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm
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This is a multi-part message in MIME format.
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--------------060407080409020101000002
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Content-Type: text/plain; charset=ISO-8859-15; format=flowed
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Content-Transfer-Encoding: 7bit
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Hello!
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There's a patch in the wild against the resolver which makes it reload
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/etc/resolv.conf on change, see
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http://sources.redhat.com/ml/libc-alpha/2004-09/msg00130.html
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However, this patch actually doesn't work properly for multi-threaded
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programs, as only one thread will notice the change and refresh its
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resolver state. I've attached a proper patch. It's for 2.5 but it should
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work with current versions, too.
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Even though the patch may not be interesting for upstream, I decided to
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let you know about this problem, since the mentioned patch seems to be
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used by at least Debian and Ubuntu.
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Regards,
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Seb.
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--------------060407080409020101000002
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Content-Type: text/plain;
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name="glibc-2.5-resolvconf.patch"
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Content-Transfer-Encoding: 7bit
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Content-Disposition: inline;
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filename="glibc-2.5-resolvconf.patch"
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Index: glibc-2.17.90/resolv/res_libc.c
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===================================================================
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--- glibc-2.17.90.orig/resolv/res_libc.c
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+++ glibc-2.17.90/resolv/res_libc.c
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@@ -22,7 +22,7 @@
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#include <arpa/nameser.h>
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#include <resolv.h>
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#include <bits/libc-lock.h>
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-
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+#include <sys/stat.h>
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/* The following bit is copied from res_data.c (where it is #ifdef'ed
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out) since res_init() should go into libc.so but the rest of that
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@@ -89,12 +89,34 @@ res_init(void) {
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return (__res_vinit(&_res, 1));
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}
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+static time_t resconf_mtime;
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+__libc_lock_define_initialized (static, resconf_mtime_lock);
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+
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+/* Check if the modification time of resolv.conf has changed.
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+ If so, have all threads re-initialize their resolver states */
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+static void
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+__res_check_resconf (void)
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+{
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+ struct stat statbuf;
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+ if (stat (_PATH_RESCONF, &statbuf) == 0) {
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+ __libc_lock_lock (resconf_mtime_lock);
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+ if (statbuf.st_mtime != resconf_mtime) {
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+ resconf_mtime = statbuf.st_mtime;
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+ atomicinclock (lock);
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+ atomicinc (__res_initstamp);
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+ atomicincunlock (lock);
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+ }
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+ __libc_lock_unlock (resconf_mtime_lock);
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+ }
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+}
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+
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/* Initialize resp if RES_INIT is not yet set or if res_init in some other
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thread requested re-initializing. */
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int
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__res_maybe_init (res_state resp, int preinit)
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{
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if (resp->options & RES_INIT) {
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+ __res_check_resconf ();
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if (__res_initstamp != resp->_u._ext.initstamp) {
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if (resp->nscount > 0)
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__res_iclose (resp, true);
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