Fix an out-of-bounds write in systemd-resolved
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
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d743bb5bcc
commit
4bbfd1a314
111
0076-test-resolved-packet-add-a-simple-test-for-our-alloc.patch
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111
0076-test-resolved-packet-add-a-simple-test-for-our-alloc.patch
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@ -0,0 +1,111 @@
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From cc3e26e6de62c793ac869d219dd8aa7757249893 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sun, 18 Jun 2017 15:53:15 -0400
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Subject: [PATCH 1/2] test-resolved-packet: add a simple test for our
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allocation functions
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---
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.gitignore | 1 +
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Makefile.am | 14 ++++++++++++
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src/resolve/test-resolved-packet.c | 45 ++++++++++++++++++++++++++++++++++++++
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3 files changed, 60 insertions(+)
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create mode 100644 src/resolve/test-resolved-packet.c
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diff --git a/.gitignore b/.gitignore
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index 01cb6e7db7..25b976a0e3 100644
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--- a/.gitignore
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+++ b/.gitignore
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@@ -269,6 +269,7 @@
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/test-replace-var
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/test-resolve
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/test-resolve-tables
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+/test-resolved-packet
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/test-ring
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/test-rlimit-util
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/test-sched-prio
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diff --git a/Makefile.am b/Makefile.am
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index a767a5aa0d..e97a66e0fa 100644
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--- a/Makefile.am
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+++ b/Makefile.am
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@@ -5663,6 +5663,7 @@ dist_zshcompletion_data += \
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tests += \
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test-dns-packet \
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test-resolve-tables \
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+ test-resolved-packet \
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test-dnssec
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manual_tests += \
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@@ -5684,6 +5685,19 @@ test_resolve_tables_LDADD = \
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$(GCRYPT_LIBS) \
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-lm
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+test_resolved_packet_SOURCES = \
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+ src/resolve/test-resolved-packet.c \
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+ $(basic_dns_sources)
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+
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+test_resolved_packet_CFLAGS = \
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+ $(AM_CFLAGS) \
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+ $(GCRYPT_CFLAGS)
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+
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+test_resolved_packet_LDADD = \
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+ libsystemd-shared.la \
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+ $(GCRYPT_LIBS) \
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+ -lm
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+
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test_dns_packet_SOURCES = \
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src/resolve/test-dns-packet.c \
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$(basic_dns_sources)
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diff --git a/src/resolve/test-resolved-packet.c b/src/resolve/test-resolved-packet.c
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new file mode 100644
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index 0000000000..8b7da1408d
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--- /dev/null
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+++ b/src/resolve/test-resolved-packet.c
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@@ -0,0 +1,45 @@
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+/***
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+ This file is part of systemd
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+
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+ Copyright 2017 Zbigniew Jędrzejewski-Szmek
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+
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+ systemd is free software; you can redistribute it and/or modify it
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+ under the terms of the GNU Lesser General Public License as published by
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+ the Free Software Foundation; either version 2.1 of the License, or
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+ (at your option) any later version.
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+
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+ systemd is distributed in the hope that it will be useful, but
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+ WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public License
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+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
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+***/
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+
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+#include "log.h"
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+#include "resolved-dns-packet.h"
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+
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+static void test_dns_packet_new(void) {
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+ size_t i;
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+
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+ for (i = 0; i < DNS_PACKET_SIZE_MAX + 2; i++) {
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+ _cleanup_(dns_packet_unrefp) DnsPacket *p = NULL;
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+
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+ assert_se(dns_packet_new(&p, DNS_PROTOCOL_DNS, i) == 0);
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+
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+ log_debug("dns_packet_new: %zu → %zu", i, p->allocated);
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+ assert_se(p->allocated >= MIN(DNS_PACKET_SIZE_MAX, i));
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+ }
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+}
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+
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+int main(int argc, char **argv) {
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+
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+ log_set_max_level(LOG_DEBUG);
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+ log_parse_environment();
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+ log_open();
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+
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+ test_dns_packet_new();
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+
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+ return 0;
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+}
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--
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2.13.0
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51
0077-resolved-simplify-alloc-size-calculation.patch
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51
0077-resolved-simplify-alloc-size-calculation.patch
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@ -0,0 +1,51 @@
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From d2a286714f136404d05c8981a2e0820c1dd6e0a9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sun, 18 Jun 2017 16:07:57 -0400
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Subject: [PATCH 2/2] resolved: simplify alloc size calculation
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The allocation size was calculated in a complicated way, and for values
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close to the page size we would actually allocate less than requested.
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Reported by Chris Coulson <chris.coulson@canonical.com>.
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CVE-2017-9445
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---
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src/resolve/resolved-dns-packet.c | 8 +-------
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src/resolve/resolved-dns-packet.h | 2 --
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2 files changed, 1 insertion(+), 9 deletions(-)
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diff --git a/src/resolve/resolved-dns-packet.c b/src/resolve/resolved-dns-packet.c
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index 240ee448f4..821b66e266 100644
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--- a/src/resolve/resolved-dns-packet.c
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+++ b/src/resolve/resolved-dns-packet.c
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@@ -47,13 +47,7 @@ int dns_packet_new(DnsPacket **ret, DnsProtocol protocol, size_t mtu) {
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assert(ret);
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- if (mtu <= UDP_PACKET_HEADER_SIZE)
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- a = DNS_PACKET_SIZE_START;
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- else
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- a = mtu - UDP_PACKET_HEADER_SIZE;
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-
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- if (a < DNS_PACKET_HEADER_SIZE)
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- a = DNS_PACKET_HEADER_SIZE;
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+ a = MAX(mtu, DNS_PACKET_HEADER_SIZE);
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/* round up to next page size */
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a = PAGE_ALIGN(ALIGN(sizeof(DnsPacket)) + a) - ALIGN(sizeof(DnsPacket));
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diff --git a/src/resolve/resolved-dns-packet.h b/src/resolve/resolved-dns-packet.h
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index 2c92392e4d..3abcaf8cf3 100644
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--- a/src/resolve/resolved-dns-packet.h
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+++ b/src/resolve/resolved-dns-packet.h
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@@ -66,8 +66,6 @@ struct DnsPacketHeader {
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/* With EDNS0 we can use larger packets, default to 4096, which is what is commonly used */
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#define DNS_PACKET_UNICAST_SIZE_LARGE_MAX 4096
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-#define DNS_PACKET_SIZE_START 512
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-
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struct DnsPacket {
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int n_ref;
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DnsProtocol protocol;
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--
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2.13.0
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10
systemd.spec
10
systemd.spec
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Name: systemd
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Url: http://www.freedesktop.org/wiki/Software/systemd
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Version: 233
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Release: 5%{?gitcommit:.git%{gitcommitshort}}%{?dist}
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Release: 6%{?gitcommit:.git%{gitcommitshort}}%{?dist}
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# For a breakdown of the licensing, see README
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License: LGPLv2+ and MIT and GPLv2+
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Summary: System and Service Manager
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@ -121,6 +121,9 @@ Patch0072: 0072-zsh-add-completion-for-add-wants-and-add-requires-60.patch
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Patch0073: 0073-udev-stop-freeing-value-after-using-it-for-setting-s.patch
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Patch0074: 0074-core-mount-pass-c-flag-to-bin-umount-6093.patch
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Patch0075: 0075-man-systemd-timesyncd.service-8-6109.patch
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Patch0076: 0076-test-resolved-packet-add-a-simple-test-for-our-alloc.patch
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Patch0077: 0077-resolved-simplify-alloc-size-calculation.patch
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Source0990: hwdb.patch
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@ -1120,10 +1123,13 @@ getent passwd systemd-journal-upload &>/dev/null || useradd -r -l -g systemd-jou
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%{pkgdir}/tests
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%changelog
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* Tue Jun 27 2017 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 233-6
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- Fix an out-of-bounds write in systemd-resolved (CVE-2017-9445)
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* Fri Jun 16 2017 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 233-5.gitec36d05
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- Update to snapshot version, build with meson
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* Thu Jun 15 2017 zbyszek <zbyszek@in.waw.pl> - 233-4
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* Thu Jun 15 2017 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 233-4
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- Backport a bunch of small fixes (memleaks, wrong format strings,
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man page clarifications, shell completion)
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- Fix systemd-resolved crash on crafted DNS packet (CVE-2017-9217, #1455493)
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