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authorGravatar Ed Blake <ed.blake@sondrel.com>2018-01-18 18:05:31 +0000
committerGravatar Peter Korsgaard <peter@korsgaard.com>2018-01-21 21:18:25 +0100
commit637f2b5e121bc7e1c9a96d0b6d636e4ef237a4ee (patch)
tree7d2a4a20fbd9c8be10466b85830b479ec029e7cc
parent371d7e8495a46d800c4c7322c5c1d09612ed181c (diff)
downloadbuildroot-637f2b5e121bc7e1c9a96d0b6d636e4ef237a4ee.tar.gz
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rpcbind: Backport fixes to memory leak security fix
Commit 954509f added a security fix for CVE-2017-8779, involving pairing all svc_getargs() calls with svc_freeargs() to avoid a memory leak. However it also introduced a couple of issues: - The call to svc_freeargs() from rpcbproc_callit_com() may result in an attempt to free static memory, resulting in undefined behaviour. - A typo in the svc_freeargs() call from pmapproc_dump() causes NIS (aka ypbind) to fail. Backport upstream fixes for these issues to version 0.2.3. Signed-off-by: Ed Blake <ed.blake@sondrel.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> (cherry picked from commit 5a9a95d0eb15c189f1361c12c105eb0ba8842c77) Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
-rw-r--r--package/rpcbind/0005-rpcbproc_callit_com-Stop-freeing-a-static-pointer.patch98
-rw-r--r--package/rpcbind/0006-pmapproc_dump-Fixed-typo-in-memory-leak-patch.patch31
2 files changed, 129 insertions, 0 deletions
diff --git a/package/rpcbind/0005-rpcbproc_callit_com-Stop-freeing-a-static-pointer.patch b/package/rpcbind/0005-rpcbproc_callit_com-Stop-freeing-a-static-pointer.patch
new file mode 100644
index 0000000000..c482af5dae
--- /dev/null
+++ b/package/rpcbind/0005-rpcbproc_callit_com-Stop-freeing-a-static-pointer.patch
@@ -0,0 +1,98 @@
+From 4e201b75928ff7d4894cd30ab0f5f67b9cd95f5c Mon Sep 17 00:00:00 2001
+From: Steve Dickson <steved@redhat.com>
+Date: Thu, 18 Jan 2018 17:33:56 +0000
+Subject: [PATCH] rpcbproc_callit_com: Stop freeing a static pointer
+
+commit 7ea36ee introduced a svc_freeargs() call
+that ended up freeing static pointer.
+
+It turns out the allocations for the rmt_args
+is not necessary . The xdr routines (xdr_bytes) will
+handle the memory management and the largest
+possible message size is UDPMSGSIZE (due to UDP only)
+which is smaller than RPC_BUF_MAX
+
+Signed-off-by: Steve Dickson <steved@redhat.com>
+(cherry picked from commit 7c7590ad536c0e24bef790cb1e65702fc54db566)
+Signed-off-by: Ed Blake <ed.blake@sondrel.com>
+---
+ src/rpcb_svc_com.c | 39 ++++++---------------------------------
+ 1 file changed, 6 insertions(+), 33 deletions(-)
+
+diff --git a/src/rpcb_svc_com.c b/src/rpcb_svc_com.c
+index 0432b6f..64f1104 100644
+--- a/src/rpcb_svc_com.c
++++ b/src/rpcb_svc_com.c
+@@ -616,9 +616,9 @@ rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp,
+ struct netconfig *nconf;
+ struct netbuf *caller;
+ struct r_rmtcall_args a;
+- char *buf_alloc = NULL, *outbufp;
++ char *outbufp;
+ char *outbuf_alloc = NULL;
+- char buf[RPC_BUF_MAX], outbuf[RPC_BUF_MAX];
++ char outbuf[RPC_BUF_MAX];
+ struct netbuf *na = (struct netbuf *) NULL;
+ struct rpc_msg call_msg;
+ int outlen;
+@@ -639,36 +639,10 @@ rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp,
+ }
+ if (si.si_socktype != SOCK_DGRAM)
+ return; /* Only datagram type accepted */
+- sendsz = __rpc_get_t_size(si.si_af, si.si_proto, UDPMSGSIZE);
+- if (sendsz == 0) { /* data transfer not supported */
+- if (reply_type == RPCBPROC_INDIRECT)
+- svcerr_systemerr(transp);
+- return;
+- }
+- /*
+- * Should be multiple of 4 for XDR.
+- */
+- sendsz = ((sendsz + 3) / 4) * 4;
+- if (sendsz > RPC_BUF_MAX) {
+-#ifdef notyet
+- buf_alloc = alloca(sendsz); /* not in IDR2? */
+-#else
+- buf_alloc = malloc(sendsz);
+-#endif /* notyet */
+- if (buf_alloc == NULL) {
+- if (debugging)
+- xlog(LOG_DEBUG,
+- "rpcbproc_callit_com: No Memory!\n");
+- if (reply_type == RPCBPROC_INDIRECT)
+- svcerr_systemerr(transp);
+- return;
+- }
+- a.rmt_args.args = buf_alloc;
+- } else {
+- a.rmt_args.args = buf;
+- }
++ sendsz = UDPMSGSIZE;
+
+ call_msg.rm_xid = 0; /* For error checking purposes */
++ memset(&a, 0, sizeof(a)); /* Zero out the input buffer */
+ if (!svc_getargs(transp, (xdrproc_t) xdr_rmtcall_args, (char *) &a)) {
+ if (reply_type == RPCBPROC_INDIRECT)
+ svcerr_decode(transp);
+@@ -708,7 +682,8 @@ rpcbproc_callit_com(struct svc_req *rqstp, SVCXPRT *transp,
+ if (rbl == (rpcblist_ptr)NULL) {
+ #ifdef RPCBIND_DEBUG
+ if (debugging)
+- xlog(LOG_DEBUG, "not found\n");
++ xlog(LOG_DEBUG, "prog %lu vers %lu: not found\n",
++ a.rmt_prog, a.rmt_vers);
+ #endif
+ if (reply_type == RPCBPROC_INDIRECT)
+ svcerr_noprog(transp);
+@@ -941,8 +916,6 @@ out:
+ }
+ if (local_uaddr)
+ free(local_uaddr);
+- if (buf_alloc)
+- free(buf_alloc);
+ if (outbuf_alloc)
+ free(outbuf_alloc);
+ if (na) {
+--
+2.11.0
+
diff --git a/package/rpcbind/0006-pmapproc_dump-Fixed-typo-in-memory-leak-patch.patch b/package/rpcbind/0006-pmapproc_dump-Fixed-typo-in-memory-leak-patch.patch
new file mode 100644
index 0000000000..11ce6a84a2
--- /dev/null
+++ b/package/rpcbind/0006-pmapproc_dump-Fixed-typo-in-memory-leak-patch.patch
@@ -0,0 +1,31 @@
+From d3f1f55e50e3c436a2ea91d60da84c3a94e6c53f Mon Sep 17 00:00:00 2001
+From: Steve Dickson <steved@redhat.com>
+Date: Thu, 18 Jan 2018 17:41:49 +0000
+Subject: [PATCH] pmapproc_dump: Fixed typo in memory leak patch
+
+commit 7ea36eee introduce a typo that caused
+NIS (aka ypbind) to fail.
+
+Signed-off-by: Steve Dickson <steved@redhat.com>
+(cherry picked from commit c49a7ea639eb700823e174fd605bbbe183e229aa)
+Signed-off-by: Ed Blake <ed.blake@sondrel.com>
+---
+ src/pmap_svc.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/pmap_svc.c b/src/pmap_svc.c
+index bb57b05..ffca7df 100644
+--- a/src/pmap_svc.c
++++ b/src/pmap_svc.c
+@@ -384,7 +384,7 @@ pmapproc_dump(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt)
+ }
+
+ done:
+- if (!svc_freeargs(xprt, (xdrproc_t) xdr_pmap, (char *)NULL)) {
++ if (!svc_freeargs(xprt, (xdrproc_t) xdr_void, (char *)NULL)) {
+ if (debugging) {
+ (void) xlog(LOG_DEBUG, "unable to free arguments\n");
+ if (doabort) {
+--
+2.11.0
+