[OE-core] [pyro][PATCH 06/13] libtirpc: Fix CVE-2017-8779
Richard Purdie
richard.purdie at linuxfoundation.org
Thu Mar 15 13:40:55 UTC 2018
From: Fan Xin <fan.xin at jp.fujitsu.com>
This vulnerability is also called "rpcbomb".
Backport upstream patch to fix this vulnerability.
CVE: CVE-2017-8779
Signed-off-by: Fan Xin<fan.xin at jp.fujitsu.com>
Signed-off-by: Ross Burton <ross.burton at intel.com>
Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
.../libtirpc/0001-Fix-for-CVE-2017-8779.patch | 276 +++++++++++++++++++++
meta/recipes-extended/libtirpc/libtirpc_1.0.1.bb | 1 +
2 files changed, 277 insertions(+)
create mode 100644 meta/recipes-extended/libtirpc/libtirpc/0001-Fix-for-CVE-2017-8779.patch
diff --git a/meta/recipes-extended/libtirpc/libtirpc/0001-Fix-for-CVE-2017-8779.patch b/meta/recipes-extended/libtirpc/libtirpc/0001-Fix-for-CVE-2017-8779.patch
new file mode 100644
index 0000000..b3bae67
--- /dev/null
+++ b/meta/recipes-extended/libtirpc/libtirpc/0001-Fix-for-CVE-2017-8779.patch
@@ -0,0 +1,276 @@
+From dd9c7cf4f8f375c6d641b760d124650c418c2ce3 Mon Sep 17 00:00:00 2001
+From: Guido Vranken <guidovranken at gmail.com>
+Date: Mon, 15 May 2017 11:12:21 -0400
+Subject: [PATCH] Fix for CVE-2017-8779
+
+Signed-off-by: Steve Dickson <steved at redhat.com>
+---
+ src/rpc_generic.c | 8 ++++++++
+ src/rpcb_prot.c | 22 ++++++++++++++--------
+ src/rpcb_st_xdr.c | 9 +++++----
+ src/xdr.c | 30 +++++++++++++++++++++++++-----
+ 4 files changed, 52 insertions(+), 17 deletions(-)
+
+CVE: CVE-2017-8779
+Upstream-Status: Backport
+
+Signed-off-by: Fan Xin <fan.xin at jp.fujitsu.com>
+
+diff --git a/src/rpc_generic.c b/src/rpc_generic.c
+index 2f09a8f..589cbd5 100644
+--- a/src/rpc_generic.c
++++ b/src/rpc_generic.c
+@@ -615,6 +615,9 @@ __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
+
+ switch (af) {
+ case AF_INET:
++ if (nbuf->len < sizeof(*sin)) {
++ return NULL;
++ }
+ sin = nbuf->buf;
+ if (inet_ntop(af, &sin->sin_addr, namebuf, sizeof namebuf)
+ == NULL)
+@@ -626,6 +629,9 @@ __rpc_taddr2uaddr_af(int af, const struct netbuf *nbuf)
+ break;
+ #ifdef INET6
+ case AF_INET6:
++ if (nbuf->len < sizeof(*sin6)) {
++ return NULL;
++ }
+ sin6 = nbuf->buf;
+ if (inet_ntop(af, &sin6->sin6_addr, namebuf6, sizeof namebuf6)
+ == NULL)
+@@ -667,6 +673,8 @@ __rpc_uaddr2taddr_af(int af, const char *uaddr)
+
+ port = 0;
+ sin = NULL;
++ if (uaddr == NULL)
++ return NULL;
+ addrstr = strdup(uaddr);
+ if (addrstr == NULL)
+ return NULL;
+diff --git a/src/rpcb_prot.c b/src/rpcb_prot.c
+index 43fd385..a923c8e 100644
+--- a/src/rpcb_prot.c
++++ b/src/rpcb_prot.c
+@@ -41,6 +41,7 @@
+ #include <rpc/types.h>
+ #include <rpc/xdr.h>
+ #include <rpc/rpcb_prot.h>
++#include "rpc_com.h"
+
+ bool_t
+ xdr_rpcb(xdrs, objp)
+@@ -53,13 +54,13 @@ xdr_rpcb(xdrs, objp)
+ if (!xdr_u_int32_t(xdrs, &objp->r_vers)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_addr, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_addr, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_owner, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_owner, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ return (TRUE);
+@@ -159,19 +160,19 @@ xdr_rpcb_entry(xdrs, objp)
+ XDR *xdrs;
+ rpcb_entry *objp;
+ {
+- if (!xdr_string(xdrs, &objp->r_maddr, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_maddr, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_nc_netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_nc_netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ if (!xdr_u_int32_t(xdrs, &objp->r_nc_semantics)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_nc_protofmly, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_nc_protofmly, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->r_nc_proto, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->r_nc_proto, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ return (TRUE);
+@@ -292,7 +293,7 @@ xdr_rpcb_rmtcallres(xdrs, p)
+ bool_t dummy;
+ struct r_rpcb_rmtcallres *objp = (struct r_rpcb_rmtcallres *)(void *)p;
+
+- if (!xdr_string(xdrs, &objp->addr, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->addr, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ if (!xdr_u_int(xdrs, &objp->results.results_len)) {
+@@ -312,6 +313,11 @@ xdr_netbuf(xdrs, objp)
+ if (!xdr_u_int32_t(xdrs, (u_int32_t *) &objp->maxlen)) {
+ return (FALSE);
+ }
++
++ if (objp->maxlen > RPC_MAXDATASIZE) {
++ return (FALSE);
++ }
++
+ dummy = xdr_bytes(xdrs, (char **)&(objp->buf),
+ (u_int *)&(objp->len), objp->maxlen);
+ return (dummy);
+diff --git a/src/rpcb_st_xdr.c b/src/rpcb_st_xdr.c
+index 08db745..28e6a48 100644
+--- a/src/rpcb_st_xdr.c
++++ b/src/rpcb_st_xdr.c
+@@ -37,6 +37,7 @@
+
+
+ #include <rpc/rpc.h>
++#include "rpc_com.h"
+
+ /* Link list of all the stats about getport and getaddr */
+
+@@ -58,7 +59,7 @@ xdr_rpcbs_addrlist(xdrs, objp)
+ if (!xdr_int(xdrs, &objp->failure)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+
+@@ -109,7 +110,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ IXDR_PUT_INT32(buf, objp->failure);
+ IXDR_PUT_INT32(buf, objp->indirect);
+ }
+- if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ if (!xdr_pointer(xdrs, (char **)&objp->next,
+@@ -147,7 +148,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ objp->failure = (int)IXDR_GET_INT32(buf);
+ objp->indirect = (int)IXDR_GET_INT32(buf);
+ }
+- if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ if (!xdr_pointer(xdrs, (char **)&objp->next,
+@@ -175,7 +176,7 @@ xdr_rpcbs_rmtcalllist(xdrs, objp)
+ if (!xdr_int(xdrs, &objp->indirect)) {
+ return (FALSE);
+ }
+- if (!xdr_string(xdrs, &objp->netid, (u_int)~0)) {
++ if (!xdr_string(xdrs, &objp->netid, RPC_MAXDATASIZE)) {
+ return (FALSE);
+ }
+ if (!xdr_pointer(xdrs, (char **)&objp->next,
+diff --git a/src/xdr.c b/src/xdr.c
+index f3fb9ad..b9a1558 100644
+--- a/src/xdr.c
++++ b/src/xdr.c
+@@ -42,8 +42,10 @@
+ #include <stdlib.h>
+ #include <string.h>
+
++#include <rpc/rpc.h>
+ #include <rpc/types.h>
+ #include <rpc/xdr.h>
++#include <rpc/rpc_com.h>
+
+ typedef quad_t longlong_t; /* ANSI long long type */
+ typedef u_quad_t u_longlong_t; /* ANSI unsigned long long type */
+@@ -53,7 +55,6 @@ typedef u_quad_t u_longlong_t; /* ANSI unsigned long long type */
+ */
+ #define XDR_FALSE ((long) 0)
+ #define XDR_TRUE ((long) 1)
+-#define LASTUNSIGNED ((u_int) 0-1)
+
+ /*
+ * for unit alignment
+@@ -629,6 +630,7 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ {
+ char *sp = *cpp; /* sp is the actual string pointer */
+ u_int nodesize;
++ bool_t ret, allocated = FALSE;
+
+ /*
+ * first deal with the length since xdr bytes are counted
+@@ -652,6 +654,7 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ }
+ if (sp == NULL) {
+ *cpp = sp = mem_alloc(nodesize);
++ allocated = TRUE;
+ }
+ if (sp == NULL) {
+ warnx("xdr_bytes: out of memory");
+@@ -660,7 +663,14 @@ xdr_bytes(xdrs, cpp, sizep, maxsize)
+ /* FALLTHROUGH */
+
+ case XDR_ENCODE:
+- return (xdr_opaque(xdrs, sp, nodesize));
++ ret = xdr_opaque(xdrs, sp, nodesize);
++ if ((xdrs->x_op == XDR_DECODE) && (ret == FALSE)) {
++ if (allocated == TRUE) {
++ free(sp);
++ *cpp = NULL;
++ }
++ }
++ return (ret);
+
+ case XDR_FREE:
+ if (sp != NULL) {
+@@ -754,6 +764,7 @@ xdr_string(xdrs, cpp, maxsize)
+ char *sp = *cpp; /* sp is the actual string pointer */
+ u_int size;
+ u_int nodesize;
++ bool_t ret, allocated = FALSE;
+
+ /*
+ * first deal with the length since xdr strings are counted-strings
+@@ -793,8 +804,10 @@ xdr_string(xdrs, cpp, maxsize)
+ switch (xdrs->x_op) {
+
+ case XDR_DECODE:
+- if (sp == NULL)
++ if (sp == NULL) {
+ *cpp = sp = mem_alloc(nodesize);
++ allocated = TRUE;
++ }
+ if (sp == NULL) {
+ warnx("xdr_string: out of memory");
+ return (FALSE);
+@@ -803,7 +816,14 @@ xdr_string(xdrs, cpp, maxsize)
+ /* FALLTHROUGH */
+
+ case XDR_ENCODE:
+- return (xdr_opaque(xdrs, sp, size));
++ ret = xdr_opaque(xdrs, sp, size);
++ if ((xdrs->x_op == XDR_DECODE) && (ret == FALSE)) {
++ if (allocated == TRUE) {
++ free(sp);
++ *cpp = NULL;
++ }
++ }
++ return (ret);
+
+ case XDR_FREE:
+ mem_free(sp, nodesize);
+@@ -823,7 +843,7 @@ xdr_wrapstring(xdrs, cpp)
+ XDR *xdrs;
+ char **cpp;
+ {
+- return xdr_string(xdrs, cpp, LASTUNSIGNED);
++ return xdr_string(xdrs, cpp, RPC_MAXDATASIZE);
+ }
+
+ /*
+--
+1.9.1
+
diff --git a/meta/recipes-extended/libtirpc/libtirpc_1.0.1.bb b/meta/recipes-extended/libtirpc/libtirpc_1.0.1.bb
index 5518fb3..f41d2f3 100644
--- a/meta/recipes-extended/libtirpc/libtirpc_1.0.1.bb
+++ b/meta/recipes-extended/libtirpc/libtirpc_1.0.1.bb
@@ -16,6 +16,7 @@ SRC_URI = "${SOURCEFORGE_MIRROR}/${BPN}/${BP}.tar.bz2;name=libtirpc \
file://export_key_secretkey_is_set.patch \
file://0001-replace-__bzero-with-memset-API.patch \
file://0001-include-stdint.h-for-uintptr_t.patch \
+ file://0001-Fix-for-CVE-2017-8779.patch \
"
SRC_URI_append_libc-uclibc = " file://remove-des-functionality.patch \
--
2.7.4
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