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authorZhang Xiao <xiao.zhang@windriver.com>2018-05-04 15:04:33 -0700
committerArmin Kuster <akuster808@gmail.com>2018-05-28 19:08:25 -0700
commit997caf9146cd3797cd054e2adebd1fbb4df91911 (patch)
tree5d5988e851ef380998840df86af7a5b799107bc9
parent2628a2ccacc3bb0256df97ef4b0245f685485c78 (diff)
downloadmeta-openembedded-morty.tar.gz
meta-openembedded-morty.tar.bz2
meta-openembedded-morty.zip
dnsmasq: backport CVE fixes from dnsmasq 2.78morty-nextmorty
CVE-2017-1449{1-6} Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com> Signed-off-by: Joe Slater <joe.slater@windriver.com> Signed-off-by: Armin Kuster <akuster808@gmail.com>
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491-02.patch75
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491.patch268
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14492.patch37
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14493.patch37
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14494.patch37
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14495.patch48
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14496.patch73
-rw-r--r--meta-networking/recipes-support/dnsmasq/dnsmasq_2.76.bb7
8 files changed, 582 insertions, 0 deletions
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491-02.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491-02.patch
new file mode 100644
index 000000000..3e73feb68
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491-02.patch
@@ -0,0 +1,75 @@
+From e441ac5247cf8252ac8db08d53862af4065d9586 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Tue, 26 Sep 2017 22:00:11 +0100
+Subject: [PATCH 7/7] Security fix, CVE-2017-14491, DNS heap buffer overflow.
+
+commit 62cb936cb7ad5f219715515ae7d32dd281a5aa1f upstream
+git://thekelleys.org.uk/dnsmasq
+
+Further fix to 0549c73b7ea6b22a3c49beb4d432f185a81efcbc
+Handles case when RR name is not a pointer to the question,
+only occurs for some auth-mode replies, therefore not
+detected by fuzzing (?)
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/rfc1035.c | 27 +++++++++++++++------------
+ 1 file changed, 15 insertions(+), 12 deletions(-)
+
+diff --git a/src/rfc1035.c b/src/rfc1035.c
+index 78410d6..e5628ba 100644
+--- a/src/rfc1035.c
++++ b/src/rfc1035.c
+@@ -1071,32 +1071,35 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+
+ va_start(ap, format); /* make ap point to 1st unamed argument */
+
+- /* nameoffset (1 or 2) + type (2) + class (2) + ttl (4) + 0 (2) */
+- CHECK_LIMIT(12);
+-
+ if (nameoffset > 0)
+ {
++ CHECK_LIMIT(2);
+ PUTSHORT(nameoffset | 0xc000, p);
+ }
+ else
+ {
+ char *name = va_arg(ap, char *);
+- if (name)
+- p = do_rfc1035_name(p, name, limit);
+- if (!p)
+- {
+- va_end(ap);
+- goto truncated;
+- }
+-
++ if (name && !(p = do_rfc1035_name(p, name, limit)))
++ {
++ va_end(ap);
++ goto truncated;
++ }
++
+ if (nameoffset < 0)
+ {
++ CHECK_LIMIT(2);
+ PUTSHORT(-nameoffset | 0xc000, p);
+ }
+ else
+- *p++ = 0;
++ {
++ CHECK_LIMIT(1);
++ *p++ = 0;
++ }
+ }
+
++ /* type (2) + class (2) + ttl (4) + rdlen (2) */
++ CHECK_LIMIT(10);
++
+ PUTSHORT(type, p);
+ PUTSHORT(class, p);
+ PUTLONG(ttl, p); /* TTL */
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491.patch
new file mode 100644
index 000000000..05986788d
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14491.patch
@@ -0,0 +1,268 @@
+From 8644f7c99c5e2fde6b6872a4ab820d3520f44e24 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 18:17:11 +0100
+Subject: [PATCH 1/7] Security fix, CVE-2017-14491 DNS heap buffer overflow.
+
+commit 0549c73b7ea6b22a3c49beb4d432f185a81efcbc upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix heap overflow in DNS code. This is a potentially serious
+security hole. It allows an attacker who can make DNS
+requests to dnsmasq, and who controls the contents of
+a domain, which is thereby queried, to overflow
+(by 2 bytes) a heap buffer and either crash, or
+even take control of, dnsmasq.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/dnsmasq.h | 2 +-
+ src/dnssec.c | 2 +-
+ src/option.c | 2 +-
+ src/rfc1035.c | 50 +++++++++++++++++++++++++++++++++++++++++---------
+ src/rfc2131.c | 4 ++--
+ src/rfc3315.c | 4 ++--
+ src/util.c | 7 ++++++-
+ 7 files changed, 54 insertions(+), 17 deletions(-)
+
+diff --git a/src/dnsmasq.h b/src/dnsmasq.h
+index 1896a64..ed5da36 100644
+--- a/src/dnsmasq.h
++++ b/src/dnsmasq.h
+@@ -1161,7 +1161,7 @@ u32 rand32(void);
+ u64 rand64(void);
+ int legal_hostname(char *c);
+ char *canonicalise(char *s, int *nomem);
+-unsigned char *do_rfc1035_name(unsigned char *p, char *sval);
++unsigned char *do_rfc1035_name(unsigned char *p, char *sval, char *limit);
+ void *safe_malloc(size_t size);
+ void safe_pipe(int *fd, int read_noblock);
+ void *whine_malloc(size_t size);
+diff --git a/src/dnssec.c b/src/dnssec.c
+index 3c77c7d..f45c804 100644
+--- a/src/dnssec.c
++++ b/src/dnssec.c
+@@ -2227,7 +2227,7 @@ size_t dnssec_generate_query(struct dns_header *header, unsigned char *end, char
+
+ p = (unsigned char *)(header+1);
+
+- p = do_rfc1035_name(p, name);
++ p = do_rfc1035_name(p, name, NULL);
+ *p++ = 0;
+ PUTSHORT(type, p);
+ PUTSHORT(class, p);
+diff --git a/src/option.c b/src/option.c
+index d8c57d6..0e1c326 100644
+--- a/src/option.c
++++ b/src/option.c
+@@ -1378,7 +1378,7 @@ static int parse_dhcp_opt(char *errstr, char *arg, int flags)
+ }
+
+ p = newp;
+- end = do_rfc1035_name(p + len, dom);
++ end = do_rfc1035_name(p + len, dom, NULL);
+ *end++ = 0;
+ len = end - p;
+ free(dom);
+diff --git a/src/rfc1035.c b/src/rfc1035.c
+index 24d08c1..78410d6 100644
+--- a/src/rfc1035.c
++++ b/src/rfc1035.c
+@@ -1049,6 +1049,7 @@ int check_for_ignored_address(struct dns_header *header, size_t qlen, struct bog
+ return 0;
+ }
+
++
+ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int nameoffset, unsigned char **pp,
+ unsigned long ttl, int *offset, unsigned short type, unsigned short class, char *format, ...)
+ {
+@@ -1058,12 +1059,21 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+ unsigned short usval;
+ long lval;
+ char *sval;
++#define CHECK_LIMIT(size) \
++ if (limit && p + (size) > (unsigned char*)limit) \
++ { \
++ va_end(ap); \
++ goto truncated; \
++ }
+
+ if (truncp && *truncp)
+ return 0;
+-
++
+ va_start(ap, format); /* make ap point to 1st unamed argument */
+-
++
++ /* nameoffset (1 or 2) + type (2) + class (2) + ttl (4) + 0 (2) */
++ CHECK_LIMIT(12);
++
+ if (nameoffset > 0)
+ {
+ PUTSHORT(nameoffset | 0xc000, p);
+@@ -1072,7 +1082,13 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+ {
+ char *name = va_arg(ap, char *);
+ if (name)
+- p = do_rfc1035_name(p, name);
++ p = do_rfc1035_name(p, name, limit);
++ if (!p)
++ {
++ va_end(ap);
++ goto truncated;
++ }
++
+ if (nameoffset < 0)
+ {
+ PUTSHORT(-nameoffset | 0xc000, p);
+@@ -1093,6 +1109,7 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+ {
+ #ifdef HAVE_IPV6
+ case '6':
++ CHECK_LIMIT(IN6ADDRSZ);
+ sval = va_arg(ap, char *);
+ memcpy(p, sval, IN6ADDRSZ);
+ p += IN6ADDRSZ;
+@@ -1100,36 +1117,47 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+ #endif
+
+ case '4':
++ CHECK_LIMIT(INADDRSZ);
+ sval = va_arg(ap, char *);
+ memcpy(p, sval, INADDRSZ);
+ p += INADDRSZ;
+ break;
+
+ case 'b':
++ CHECK_LIMIT(1);
+ usval = va_arg(ap, int);
+ *p++ = usval;
+ break;
+
+ case 's':
++ CHECK_LIMIT(2);
+ usval = va_arg(ap, int);
+ PUTSHORT(usval, p);
+ break;
+
+ case 'l':
++ CHECK_LIMIT(4);
+ lval = va_arg(ap, long);
+ PUTLONG(lval, p);
+ break;
+
+ case 'd':
+- /* get domain-name answer arg and store it in RDATA field */
+- if (offset)
+- *offset = p - (unsigned char *)header;
+- p = do_rfc1035_name(p, va_arg(ap, char *));
+- *p++ = 0;
++ /* get domain-name answer arg and store it in RDATA field */
++ if (offset)
++ *offset = p - (unsigned char *)header;
++ p = do_rfc1035_name(p, va_arg(ap, char *), limit);
++ if (!p)
++ {
++ va_end(ap);
++ goto truncated;
++ }
++ CHECK_LIMIT(1);
++ *p++ = 0;
+ break;
+
+ case 't':
+ usval = va_arg(ap, int);
++ CHECK_LIMIT(usval);
+ sval = va_arg(ap, char *);
+ if (usval != 0)
+ memcpy(p, sval, usval);
+@@ -1141,20 +1169,24 @@ int add_resource_record(struct dns_header *header, char *limit, int *truncp, int
+ usval = sval ? strlen(sval) : 0;
+ if (usval > 255)
+ usval = 255;
++ CHECK_LIMIT(usval + 1);
+ *p++ = (unsigned char)usval;
+ memcpy(p, sval, usval);
+ p += usval;
+ break;
+ }
+
++#undef CHECK_LIMIT
+ va_end(ap); /* clean up variable argument pointer */
+
+ j = p - sav - 2;
+- PUTSHORT(j, sav); /* Now, store real RDLength */
++ /* this has already been checked against limit before */
++ PUTSHORT(j, sav); /* Now, store real RDLength */
+
+ /* check for overflow of buffer */
+ if (limit && ((unsigned char *)limit - p) < 0)
+ {
++truncated:
+ if (truncp)
+ *truncp = 1;
+ return 0;
+diff --git a/src/rfc2131.c b/src/rfc2131.c
+index b7c167e..0dffd36 100644
+--- a/src/rfc2131.c
++++ b/src/rfc2131.c
+@@ -2419,10 +2419,10 @@ static void do_options(struct dhcp_context *context,
+
+ if (fqdn_flags & 0x04)
+ {
+- p = do_rfc1035_name(p, hostname);
++ p = do_rfc1035_name(p, hostname, NULL);
+ if (domain)
+ {
+- p = do_rfc1035_name(p, domain);
++ p = do_rfc1035_name(p, domain, NULL);
+ *p++ = 0;
+ }
+ }
+diff --git a/src/rfc3315.c b/src/rfc3315.c
+index 3f4d69c..73bdee4 100644
+--- a/src/rfc3315.c
++++ b/src/rfc3315.c
+@@ -1472,10 +1472,10 @@ static struct dhcp_netid *add_options(struct state *state, int do_refresh)
+ if ((p = expand(len + 2)))
+ {
+ *(p++) = state->fqdn_flags;
+- p = do_rfc1035_name(p, state->hostname);
++ p = do_rfc1035_name(p, state->hostname, NULL);
+ if (state->send_domain)
+ {
+- p = do_rfc1035_name(p, state->send_domain);
++ p = do_rfc1035_name(p, state->send_domain, NULL);
+ *p = 0;
+ }
+ }
+diff --git a/src/util.c b/src/util.c
+index 93b24f5..a377e6f 100644
+--- a/src/util.c
++++ b/src/util.c
+@@ -218,15 +218,20 @@ char *canonicalise(char *in, int *nomem)
+ return ret;
+ }
+
+-unsigned char *do_rfc1035_name(unsigned char *p, char *sval)
++unsigned char *do_rfc1035_name(unsigned char *p, char *sval, char *limit)
+ {
+ int j;
+
+ while (sval && *sval)
+ {
++ if (limit && p + 1 > (unsigned char*)limit)
++ return p;
++
+ unsigned char *cp = p++;
+ for (j = 0; *sval && (*sval != '.'); sval++, j++)
+ {
++ if (limit && p + 1 > (unsigned char*)limit)
++ return p;
+ #ifdef HAVE_DNSSEC
+ if (option_bool(OPT_DNSSEC_VALID) && *sval == NAME_ESCAPE)
+ *p++ = (*(++sval))-1;
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14492.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14492.patch
new file mode 100644
index 000000000..19949314c
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14492.patch
@@ -0,0 +1,37 @@
+From 6a0e7dbac67a8393e4505e593e5c46544c53eae0 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 18:47:15 +0100
+Subject: [PATCH 2/7] Security fix, CVE-2017-14492, DHCPv6 RA heap overflow.
+
+commit 24036ea507862c7b7898b68289c8130f85599c10 upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix heap overflow in IPv6 router advertisement code.
+This is a potentially serious security hole, as a
+crafted RA request can overflow a buffer and crash or
+control dnsmasq. Attacker must be on the local network.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/radv.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/radv.c b/src/radv.c
+index 749b666..d09fe0e 100644
+--- a/src/radv.c
++++ b/src/radv.c
+@@ -198,6 +198,9 @@ void icmp6_packet(time_t now)
+ /* look for link-layer address option for logging */
+ if (sz >= 16 && packet[8] == ICMP6_OPT_SOURCE_MAC && (packet[9] * 8) + 8 <= sz)
+ {
++ if ((packet[9] * 8 - 2) * 3 - 1 >= MAXDNAME) {
++ return;
++ }
+ print_mac(daemon->namebuff, &packet[10], (packet[9] * 8) - 2);
+ mac = daemon->namebuff;
+ }
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14493.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14493.patch
new file mode 100644
index 000000000..ae99cf49a
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14493.patch
@@ -0,0 +1,37 @@
+From f23f4be3cb72d307806e3d3ca14779f69ac5494c Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 18:52:50 +0100
+Subject: [PATCH 3/7] Security fix, CVE-2017-14493, DHCPv6 - Stack buffer
+ overflow.
+
+commit 3d4ff1ba8419546490b464418223132529514033 upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix stack overflow in DHCPv6 code. An attacker who can send
+a DHCPv6 request to dnsmasq can overflow the stack frame and
+crash or control dnsmasq.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/rfc3315.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/rfc3315.c b/src/rfc3315.c
+index 73bdee4..8d18a28 100644
+--- a/src/rfc3315.c
++++ b/src/rfc3315.c
+@@ -206,6 +206,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
+ /* RFC-6939 */
+ if ((opt = opt6_find(opts, end, OPTION6_CLIENT_MAC, 3)))
+ {
++ if (opt6_len(opt) - 2 > DHCP_CHADDR_MAX) {
++ return 0;
++ }
+ state->mac_type = opt6_uint(opt, 0, 2);
+ state->mac_len = opt6_len(opt) - 2;
+ memcpy(&state->mac[0], opt6_ptr(opt, 2), state->mac_len);
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14494.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14494.patch
new file mode 100644
index 000000000..a6f0e2abe
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14494.patch
@@ -0,0 +1,37 @@
+From aba3f8df87d104d599920ea44e96191601638961 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 20:05:11 +0100
+Subject: [PATCH 4/7] Security fix, CVE-2017-14494, Infoleak handling DHCPv6
+ forwarded requests.
+
+commit 33e3f1029c9ec6c63e430ff51063a6301d4b2262 upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix information leak in DHCPv6. A crafted DHCPv6 packet can
+cause dnsmasq to forward memory from outside the packet
+buffer to a DHCPv6 server when acting as a relay.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/rfc3315.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/rfc3315.c b/src/rfc3315.c
+index 8d18a28..03b3f84 100644
+--- a/src/rfc3315.c
++++ b/src/rfc3315.c
+@@ -216,6 +216,9 @@ static int dhcp6_maybe_relay(struct state *state, void *inbuff, size_t sz,
+
+ for (opt = opts; opt; opt = opt6_next(opt, end))
+ {
++ if (opt6_ptr(opt, 0) + opt6_len(opt) >= end) {
++ return 0;
++ }
+ int o = new_opt6(opt6_type(opt));
+ if (opt6_type(opt) == OPTION6_RELAY_MSG)
+ {
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14495.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14495.patch
new file mode 100644
index 000000000..31014d102
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14495.patch
@@ -0,0 +1,48 @@
+From e4ae220ee00dcad20a716432badd3210b442ddb4 Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 20:16:50 +0100
+Subject: [PATCH 6/7] Security fix, CVE-2017-14495, OOM in DNS response
+ creation.
+
+commit 51eadb692a5123b9838e5a68ecace3ac579a3a45 upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix out-of-memory Dos vulnerability. An attacker which can
+send malicious DNS queries to dnsmasq can trigger memory
+allocations in the add_pseudoheader function
+The allocated memory is never freed which leads to a DoS
+through memory exhaustion. dnsmasq is vulnerable only
+if one of the following option is specified:
+--add-mac, --add-cpe-id or --add-subnet.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/edns0.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/src/edns0.c b/src/edns0.c
+index a2ef0ea..f48c084 100644
+--- a/src/edns0.c
++++ b/src/edns0.c
+@@ -192,9 +192,15 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ !(p = skip_section(p,
+ ntohs(header->ancount) + ntohs(header->nscount) + ntohs(header->arcount),
+ header, plen)))
++ {
++ free(buff);
+ return plen;
++ }
+ if (p + 11 > limit)
+- return plen; /* Too big */
++ {
++ free(buff);
++ return plen; /* Too big */
++ }
+ *p++ = 0; /* empty name */
+ PUTSHORT(T_OPT, p);
+ PUTSHORT(udp_sz, p); /* max packet length, 512 if not given in EDNS0 header */
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14496.patch b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14496.patch
new file mode 100644
index 000000000..fc50ef084
--- /dev/null
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq/dnsmasq-CVE-2017-14496.patch
@@ -0,0 +1,73 @@
+From c25545680679a12d78dd80662ed1bc5d97a38d6d Mon Sep 17 00:00:00 2001
+From: Simon Kelley <simon@thekelleys.org.uk>
+Date: Mon, 25 Sep 2017 20:11:58 +0100
+Subject: [PATCH 5/7] Security fix, CVE-2017-14496, Integer underflow in DNS
+ response creation.
+
+commit 897c113fda0886a28a986cc6ba17bb93bd6cb1c7 upstream
+git://thekelleys.org.uk/dnsmasq
+
+Fix DoS in DNS. Invalid boundary checks in the
+add_pseudoheader function allows a memcpy call with negative
+size An attacker which can send malicious DNS queries
+to dnsmasq can trigger a DoS remotely.
+dnsmasq is vulnerable only if one of the following option is
+specified: --add-mac, --add-cpe-id or --add-subnet.
+
+Upstream-Status: Backport
+
+Signed-off-by: Zhang Xiao <xiao.zhang@windriver.com>
+---
+ src/edns0.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+diff --git a/src/edns0.c b/src/edns0.c
+index c7a101e..a2ef0ea 100644
+--- a/src/edns0.c
++++ b/src/edns0.c
+@@ -144,7 +144,7 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ GETSHORT(len, p);
+
+ /* malformed option, delete the whole OPT RR and start again. */
+- if (i + len > rdlen)
++ if (i + 4 + len > rdlen)
+ {
+ rdlen = 0;
+ is_last = 0;
+@@ -193,6 +193,8 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ ntohs(header->ancount) + ntohs(header->nscount) + ntohs(header->arcount),
+ header, plen)))
+ return plen;
++ if (p + 11 > limit)
++ return plen; /* Too big */
+ *p++ = 0; /* empty name */
+ PUTSHORT(T_OPT, p);
+ PUTSHORT(udp_sz, p); /* max packet length, 512 if not given in EDNS0 header */
+@@ -204,6 +206,11 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ /* Copy back any options */
+ if (buff)
+ {
++ if (p + rdlen > limit)
++ {
++ free(buff);
++ return plen; /* Too big */
++ }
+ memcpy(p, buff, rdlen);
+ free(buff);
+ p += rdlen;
+@@ -217,8 +224,12 @@ size_t add_pseudoheader(struct dns_header *header, size_t plen, unsigned char *l
+ /* Add new option */
+ if (optno != 0 && replace != 2)
+ {
++ if (p + 4 > limit)
++ return plen; /* Too big */
+ PUTSHORT(optno, p);
+ PUTSHORT(optlen, p);
++ if (p + optlen > limit)
++ return plen; /* Too big */
+ memcpy(p, opt, optlen);
+ p += optlen;
+ PUTSHORT(p - datap, lenp);
+--
+2.11.0
+
diff --git a/meta-networking/recipes-support/dnsmasq/dnsmasq_2.76.bb b/meta-networking/recipes-support/dnsmasq/dnsmasq_2.76.bb
index 41573d9dd..5b68d98f8 100644
--- a/meta-networking/recipes-support/dnsmasq/dnsmasq_2.76.bb
+++ b/meta-networking/recipes-support/dnsmasq/dnsmasq_2.76.bb
@@ -2,6 +2,13 @@ require dnsmasq.inc
SRC_URI += "\
file://lua.patch \
+ file://dnsmasq-CVE-2017-14491.patch \
+ file://dnsmasq-CVE-2017-14492.patch \
+ file://dnsmasq-CVE-2017-14493.patch \
+ file://dnsmasq-CVE-2017-14494.patch \
+ file://dnsmasq-CVE-2017-14496.patch \
+ file://dnsmasq-CVE-2017-14495.patch \
+ file://dnsmasq-CVE-2017-14491-02.patch \
"
SRC_URI[dnsmasq-2.76.md5sum] = "6610f8233ca89b15a1bb47c788ffb84f"