Your message dated Wed, 04 Jun 2014 21:36:00 +0000 with message-id <E1WsIqm-0001sp-Ow@franck.debian.org> and subject line Bug#722075: fixed in eglibc 2.19-1 has caused the Debian Bug report #722075, regarding libc6: getaddrinfo() sends DNS queries to random file descriptors to be marked as done. This means that you claim that the problem has been dealt with. If this is not the case it is now your responsibility to reopen the Bug report if necessary, and/or fix the problem forthwith. (NB: If you are a system administrator and have no idea what this message is talking about, this may indicate a serious mail system misconfiguration somewhere. Please contact owner@bugs.debian.org immediately.) -- 722075: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=722075 Debian Bug Tracking System Contact owner@bugs.debian.org with problems
--- Begin Message ---
- To: Debian Bug Tracking System <submit@bugs.debian.org>
- Subject: libc6: getaddrinfo() sends DNS queries to random file descriptors
- From: Arnaud Le Blanc <arnaud.lb@gmail.com>
- Date: Sat, 07 Sep 2013 15:55:48 +0200
- Message-id: <20130907135548.28317.32160.reportbug@a.hostnametest>
Package: libc6 Version: 2.13-38 Severity: normal Under high load, getaddrinfo() seems to start sending DNS queries to random file descriptors. If a process has opened connections to remote servers or clients, getaddrinfo() may write DNS queries to these connections. This has been noticed on a real world application written in golang, and the bug was successfuly reproduced using pure C code. The attached code reproduces the bug on libc6 packages 2.13-38 (stable), 2.17-92 (testing). What the code does: - a thread listens to a local unix socket - a thread connects to the unix socket, never writes to it, dups the connection as much as possible (fills the fd space), close the dups, and starts dup()ing again - lots of threads call getaddrinfo() Under less than a minute, the listener starts reading garbage (presumably DNS queries). -- System Information: Debian Release: jessie/sid APT prefers testing APT policy: (990, 'testing'), (500, 'unstable'), (500, 'stable'), (1, 'experimental') Architecture: i386 (x86_64) Foreign Architectures: amd64 Kernel: Linux 3.10-2-amd64 (SMP w/8 CPU cores) Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash// gcc -o bug bug.c -lpthread && ./bug #include <sys/types.h> #include <sys/stat.h> #include <stdio.h> #include <sys/socket.h> #include <netdb.h> #include <errno.h> #include <sys/un.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #define LOOKUP_THREADS 1000 #define SOCKET_PATH "/tmp/test.sock" void* lookup_thread(void *_) { for (;;) { struct addrinfo *res; struct addrinfo hints; memset(&hints, 0, sizeof(hints)); if (0 == getaddrinfo("example.com", NULL, &hints, &res)) { freeaddrinfo(res); } } return NULL; } void lookup() { int i; for (i = 0; i < LOOKUP_THREADS; i++) { pthread_t t; pthread_attr_t ta; pthread_attr_init(&ta); pthread_attr_setstacksize(&ta, 100<<10); if (0 != pthread_create(&t, &ta, lookup_thread, (void*)(uintptr_t)i)) { perror("pthread_create lookup thread"); exit(1); } pthread_attr_destroy(&ta); } } void* server_thread(void *_) { struct sockaddr_un saddr; int s = socket(AF_UNIX, SOCK_STREAM, 0); memset(&saddr, 0, sizeof(saddr)); if (s == -1) { perror("server socket"); return NULL; } saddr.sun_family = AF_UNIX; strncpy(saddr.sun_path, SOCKET_PATH, sizeof(saddr.sun_path)-1); if (bind(s, (struct sockaddr *)&saddr, sizeof(struct sockaddr_un)) == -1) { perror("bind"); close(s); return NULL; } if (-1 == listen(s, 0)) { perror("listen"); close(s); return NULL; } for (;;) { struct sockaddr_un paddr; socklen_t paddrlen; int fd = accept(s, (struct sockaddr*) &paddr, &paddrlen); if (fd == -1) { perror("accept"); close(s); return NULL; } for (;;) { char c; int n = read(fd, &c, 1); fprintf(stderr, "BUG: has read char 0x%02hhx: %c\a\n", (unsigned int) c, c); if (n == 0) { break; } } close(fd); } return NULL; } void sock() { int s, i, m; struct sockaddr_un saddr; // open a client socket to SOCK_STREAM for (;;) { s = socket(AF_UNIX, SOCK_STREAM, 0); if (s == -1) { perror("socket"); sleep(1); continue; } memset(&saddr, 0, sizeof(saddr)); saddr.sun_family = AF_UNIX; strncpy(saddr.sun_path, SOCKET_PATH, sizeof(saddr.sun_path)-1); if (connect(s, (struct sockaddr *)&saddr, sizeof(struct sockaddr_un)) == -1) { perror("connect"); close(s); sleep(1); continue; } break; } // repeatedly fill the file descriptor space with dups of the socket, and close the dups int fds[65536]; for (;;) { for (i = 0, m = 0; i < sizeof(fds)/sizeof(*fds); i++) { int fd = dup(s); if (fd == -1) { if (errno == EMFILE) { break; } else { perror("dup"); } } fds[i] = fd; m = i; } for (i = 0; i <= m; i++) { close(fds[i]); } continue; } } int main() { // Listen on SOCKET_PATH; if we receive something on this socket, we have // successfuly reproduced the bug unlink(SOCKET_PATH); pthread_t t; if (0 != pthread_create(&t, NULL, server_thread, NULL)) { perror("pthread_create server thread"); return 1; } // Do many getaddrinfo() in parallel lookup(); // Connect to SOCKET_PATH and dup()&close() the fd repeatedly sock(); return 0; }
--- End Message ---
--- Begin Message ---
- To: 722075-close@bugs.debian.org
- Subject: Bug#722075: fixed in eglibc 2.19-1
- From: Aurelien Jarno <aurel32@debian.org>
- Date: Wed, 04 Jun 2014 21:36:00 +0000
- Message-id: <E1WsIqm-0001sp-Ow@franck.debian.org>
Source: eglibc Source-Version: 2.19-1 We believe that the bug you reported is fixed in the latest version of eglibc, which is due to be installed in the Debian FTP archive. A summary of the changes between this version and the previous one is attached. Thank you for reporting the bug, which will now be closed. If you have further comments please address them to 722075@bugs.debian.org, and the maintainer will reopen the bug report if appropriate. Debian distribution maintenance software pp. Aurelien Jarno <aurel32@debian.org> (supplier of updated eglibc package) (This message was generated automatically at their request; if you believe that there is a problem with it please contact the archive administrators by mailing ftpmaster@ftp-master.debian.org) -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Format: 1.8 Date: Wed, 04 Jun 2014 20:32:06 +0200 Source: eglibc Binary: libc-bin libc-dev-bin glibc-doc eglibc-source locales locales-all nscd multiarch-support libc6 libc6-dev libc6-dbg libc6-prof libc6-pic libc6-udeb libc6.1 libc6.1-dev libc6.1-dbg libc6.1-prof libc6.1-pic libc6.1-udeb libc0.3 libc0.3-dev libc0.3-dbg libc0.3-prof libc0.3-pic libc0.3-udeb libc0.1 libc0.1-dev libc0.1-dbg libc0.1-prof libc0.1-pic libc0.1-udeb libc6-i386 libc6-dev-i386 libc6-sparc libc6-dev-sparc libc6-sparc64 libc6-dev-sparc64 libc6-s390 libc6-dev-s390 libc6-amd64 libc6-dev-amd64 libc6-powerpc libc6-dev-powerpc libc6-ppc64 libc6-dev-ppc64 libc6-mipsn32 libc6-dev-mipsn32 libc6-mips64 libc6-dev-mips64 libc6-armhf libc6-dev-armhf libc6-armel libc6-dev-armel libc0.1-i386 libc0.1-dev-i386 libc6-x32 libc6-dev-x32 libc6-i686 libc6-xen libc0.1-i686 libc0.3-i686 libc0.3-xen libc6.1-alphaev67 libc6-loongson2f libnss-dns-udeb libnss-files-udeb Architecture: source all amd64 Version: 2.19-1 Distribution: unstable Urgency: medium Maintainer: Aurelien Jarno <aurel32@debian.org> Changed-By: Aurelien Jarno <aurel32@debian.org> Description: eglibc-source - Embedded GNU C Library: sources glibc-doc - Embedded GNU C Library: Documentation libc-bin - Embedded GNU C Library: Binaries libc-dev-bin - Embedded GNU C Library: Development binaries libc0.1 - Embedded GNU C Library: Shared libraries libc0.1-dbg - Embedded GNU C Library: detached debugging symbols libc0.1-dev - Embedded GNU C Library: Development Libraries and Header Files libc0.1-dev-i386 - Embedded GNU C Library: 32bit development libraries for AMD64 libc0.1-i386 - Embedded GNU C Library: 32bit shared libraries for AMD64 libc0.1-i686 - Embedded GNU C Library: Shared libraries [i686 optimized] libc0.1-pic - Embedded GNU C Library: PIC archive library libc0.1-prof - Embedded GNU C Library: Profiling Libraries libc0.1-udeb - Embedded GNU C Library: Shared libraries - udeb (udeb) libc0.3 - Embedded GNU C Library: Shared libraries libc0.3-dbg - Embedded GNU C Library: detached debugging symbols libc0.3-dev - Embedded GNU C Library: Development Libraries and Header Files libc0.3-i686 - Embedded GNU C Library: Shared libraries [i686 optimized] libc0.3-pic - Embedded GNU C Library: PIC archive library libc0.3-prof - Embedded GNU C Library: Profiling Libraries libc0.3-udeb - Embedded GNU C Library: Shared libraries - udeb (udeb) libc0.3-xen - Embedded GNU C Library: Shared libraries [Xen version] libc6 - Embedded GNU C Library: Shared libraries libc6-amd64 - Embedded GNU C Library: 64bit Shared libraries for AMD64 libc6-armel - Embedded GNU C Library: ARM softfp shared libraries for armhf libc6-armhf - Embedded GNU C Library: ARM hard float shared libraries for armel libc6-dbg - Embedded GNU C Library: detached debugging symbols libc6-dev - Embedded GNU C Library: Development Libraries and Header Files libc6-dev-amd64 - Embedded GNU C Library: 64bit Development Libraries for AMD64 libc6-dev-armel - Embedded GNU C Library: ARM softfp development libraries for armh libc6-dev-armhf - Embedded GNU C Library: ARM hard float development libraries for libc6-dev-i386 - Embedded GNU C Library: 32-bit development libraries for AMD64 libc6-dev-mips64 - Embedded GNU C Library: 64bit Development Libraries for MIPS64 libc6-dev-mipsn32 - Embedded GNU C Library: n32 Development Libraries for MIPS64 libc6-dev-powerpc - Embedded GNU C Library: 32bit powerpc development libraries for p libc6-dev-ppc64 - Embedded GNU C Library: 64bit Development Libraries for PowerPC64 libc6-dev-s390 - Embedded GNU C Library: 32bit Development Libraries for IBM zSeri libc6-dev-sparc - Embedded GNU C Library: 32bit Development Libraries for SPARC libc6-dev-sparc64 - Embedded GNU C Library: 64bit Development Libraries for UltraSPAR libc6-dev-x32 - Embedded GNU C Library: X32 ABI Development Libraries for AMD64 libc6-i386 - Embedded GNU C Library: 32-bit shared libraries for AMD64 libc6-i686 - Embedded GNU C Library: Shared libraries [i686 optimized] libc6-loongson2f - Embedded GNU C Library: Shared libraries (Loongson 2F optimized) libc6-mips64 - Embedded GNU C Library: 64bit Shared libraries for MIPS64 libc6-mipsn32 - Embedded GNU C Library: n32 Shared libraries for MIPS64 libc6-pic - Embedded GNU C Library: PIC archive library libc6-powerpc - Embedded GNU C Library: 32bit powerpc shared libraries for ppc64 libc6-ppc64 - Embedded GNU C Library: 64bit Shared libraries for PowerPC64 libc6-prof - Embedded GNU C Library: Profiling Libraries libc6-s390 - Embedded GNU C Library: 32bit Shared libraries for IBM zSeries libc6-sparc - Embedded GNU C Library: 32bit Shared libraries for SPARC libc6-sparc64 - Embedded GNU C Library: 64bit Shared libraries for UltraSPARC libc6-udeb - Embedded GNU C Library: Shared libraries - udeb (udeb) libc6-x32 - Embedded GNU C Library: X32 ABI Shared libraries for AMD64 libc6-xen - Embedded GNU C Library: Shared libraries [Xen version] libc6.1 - Embedded GNU C Library: Shared libraries libc6.1-alphaev67 - Embedded GNU C Library: Shared libraries (EV67 optimized) libc6.1-dbg - Embedded GNU C Library: detached debugging symbols libc6.1-dev - Embedded GNU C Library: Development Libraries and Header Files libc6.1-pic - Embedded GNU C Library: PIC archive library libc6.1-prof - Embedded GNU C Library: Profiling Libraries libc6.1-udeb - Embedded GNU C Library: Shared libraries - udeb (udeb) libnss-dns-udeb - Embedded GNU C Library: NSS helper for DNS - udeb (udeb) libnss-files-udeb - Embedded GNU C Library: NSS helper for files - udeb (udeb) locales - Embedded GNU C Library: National Language (locale) data [support] locales-all - Embedded GNU C Library: Precompiled locale data multiarch-support - Transitional package to ensure multiarch compatibility nscd - Embedded GNU C Library: Name Service Cache Daemon Closes: 647084 722075 749087 750124 Changes: eglibc (2.19-1) unstable; urgency=medium . [ Aurelien Jarno ] * debian/control.in/main: remove outdated Build-Depends on bzip2. * debian/patches/any/cvs-resolv-reuse-fd.diff: new patch from upstream to fix invalid file descriptor reuse while sending DNS query. Closes: #722075. * Finish debconf translation update from Esko Arajärvi. Closes: #750124. * debian/patches/git-updates.diff: update from the 2.19 branch: - fixes pthread_spin_lock on sparc/sparc64. Closes: #749087. * debian/patches/any/submitted-argp-attribute.diff: new patch from Ondřej Bílka to fix string functions with FORTIFY_SOURCE=2 when <argp.h> is included before <string.h>. Closes: #647084. * debian/sysdeps/{sparc,sparc64}.mk: temporarily pass --disable-multiarch to configure to try to fix random segmentation faults on Niagara 1 machines. . [ Samuel Thibault ] * hurd-i386/unsubmitted-pthread_posix-option.diff: Split patches into... * ... hurd-i386/tg-{posix_thread,gai_misc}.diff. * patches/hurd-i386/cvs-libpthread_guardsize.diff: Fix guard size computation and enable again. 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