+++ /dev/null
-From 7ea36eeece56b59f98e469934e4c20b4da043346 Mon Sep 17 00:00:00 2001
-From: Doran Moppert <dmoppert@redhat.com>
-Date: Thu, 11 May 2017 11:42:54 -0400
-Subject: [PATCH] rpcbind: pair all svc_getargs() calls with svc_freeargs() to
- avoid memory leak
-
-This patch is to address CVE-2017-8779 "rpcbomb" in rpcbind, discussed
-at [1], [2], [3]. The last link suggests this issue is actually a bug
-in rpcbind, which led me here.
-
-The leak caused by the reproducer at [4] appears to come from
-rpcb_service_4(), in the case where svc_getargs() returns false and the
-function had an early return, rather than passing through the cleanup
-path at done:, as would otherwise occur.
-
-It also addresses a couple of other locations where the same fault seems
-to exist, though I haven't been able to exercise those. I hope someone
-more intimate with rpc(3) can confirm my understanding is correct, and
-that I haven't introduced any new bugs.
-
-Without this patch, using the reproducer (and variants) repeatedly
-against rpcbind with a numBytes argument of 1_000_000_000, /proc/$(pidof
-rpcbind)/status reports VmSize increase of 976564 kB each call, and
-VmRSS increase of around 260 kB every 33 calls - the specific numbers
-are probably an artifact of my rhel/glibc version. With the patch,
-there is a small (~50 kB) VmSize increase with the first message, but
-thereafter both VmSize and VmRSS remain steady.
-
-[1]: http://seclists.org/oss-sec/2017/q2/209
-[2]: https://bugzilla.redhat.com/show_bug.cgi?id=1448124
-[3]: https://sourceware.org/ml/libc-alpha/2017-05/msg00129.html
-[4]: https://github.com/guidovranken/rpcbomb/
-
-
-CVE: CVE-2017-8779
-Upstream-Status: Backport
-
-Signed-off-by: Fan Xin <fan.xin@jp.fujitsu.com>
----
- src/pmap_svc.c | 56 +++++++++++++++++++++++++++++++++++++++++++++---------
- src/rpcb_svc.c | 2 +-
- src/rpcb_svc_4.c | 2 +-
- src/rpcb_svc_com.c | 8 ++++++++
- 4 files changed, 57 insertions(+), 11 deletions(-)
-
-diff --git a/src/pmap_svc.c b/src/pmap_svc.c
-index 4c744fe..e926cdc 100644
---- a/src/pmap_svc.c
-+++ b/src/pmap_svc.c
-@@ -175,6 +175,7 @@ pmapproc_change(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt, unsigned long
- long ans;
- uid_t uid;
- char uidbuf[32];
-+ int rc = TRUE;
-
- /*
- * Can't use getpwnam here. We might end up calling ourselves
-@@ -194,7 +195,8 @@ pmapproc_change(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt, unsigned long
-
- if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
- svcerr_decode(xprt);
-- return (FALSE);
-+ rc = FALSE;
-+ goto done;
- }
- #ifdef RPCBIND_DEBUG
- if (debugging)
-@@ -205,7 +207,8 @@ pmapproc_change(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt, unsigned long
-
- if (!check_access(xprt, op, reg.pm_prog, PMAPVERS)) {
- svcerr_weakauth(xprt);
-- return (FALSE);
-+ rc = (FALSE);
-+ goto done;
- }
-
- rpcbreg.r_prog = reg.pm_prog;
-@@ -258,7 +261,16 @@ done_change:
- rpcbs_set(RPCBVERS_2_STAT, ans);
- else
- rpcbs_unset(RPCBVERS_2_STAT, ans);
-- return (TRUE);
-+done:
-+ if (!svc_freeargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
-+ if (debugging) {
-+ /*(void) xlog(LOG_DEBUG, "unable to free arguments\n");*/
-+ if (doabort) {
-+ rpcbind_abort();
-+ }
-+ }
-+ }
-+ return (rc);
- }
-
- /* ARGSUSED */
-@@ -272,15 +284,18 @@ pmapproc_getport(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt)
- #ifdef RPCBIND_DEBUG
- char *uaddr;
- #endif
-+ int rc = TRUE;
-
- if (!svc_getargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
- svcerr_decode(xprt);
-- return (FALSE);
-+ rc = FALSE;
-+ goto done;
- }
-
- if (!check_access(xprt, PMAPPROC_GETPORT, reg.pm_prog, PMAPVERS)) {
- svcerr_weakauth(xprt);
-- return FALSE;
-+ rc = FALSE;
-+ goto done;
- }
-
- #ifdef RPCBIND_DEBUG
-@@ -330,21 +345,34 @@ pmapproc_getport(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt)
- pmap_ipprot2netid(reg.pm_prot) ?: "<unknown>",
- port ? udptrans : "");
-
-- return (TRUE);
-+done:
-+ if (!svc_freeargs(xprt, (xdrproc_t) xdr_pmap, (char *)®)) {
-+ if (debugging) {
-+ /* (void) xlog(LOG_DEBUG, "unable to free arguments\n");*/
-+ if (doabort) {
-+ rpcbind_abort();
-+ }
-+ }
-+ }
-+ return (rc);
- }
-
- /* ARGSUSED */
- static bool_t
- pmapproc_dump(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt)
- {
-+ int rc = TRUE;
-+
- if (!svc_getargs(xprt, (xdrproc_t)xdr_void, NULL)) {
- svcerr_decode(xprt);
-- return (FALSE);
-+ rc = FALSE;
-+ goto done;
- }
-
- if (!check_access(xprt, PMAPPROC_DUMP, 0, PMAPVERS)) {
- svcerr_weakauth(xprt);
-- return FALSE;
-+ rc = FALSE;
-+ goto done;
- }
-
- if ((!svc_sendreply(xprt, (xdrproc_t) xdr_pmaplist_ptr,
-@@ -354,7 +382,17 @@ pmapproc_dump(struct svc_req *rqstp /*__unused*/, SVCXPRT *xprt)
- rpcbind_abort();
- }
- }
-- return (TRUE);
-+
-+done:
-+ if (!svc_freeargs(xprt, (xdrproc_t) xdr_pmap, (char *)NULL)) {
-+ if (debugging) {
-+ /*(void) xlog(LOG_DEBUG, "unable to free arguments\n");*/
-+ if (doabort) {
-+ rpcbind_abort();
-+ }
-+ }
-+ }
-+ return (rc);
- }
-
- int pmap_netid2ipprot(const char *netid)
-diff --git a/src/rpcb_svc.c b/src/rpcb_svc.c
-index 709e3fb..091f530 100644
---- a/src/rpcb_svc.c
-+++ b/src/rpcb_svc.c
-@@ -166,7 +166,7 @@ rpcb_service_3(struct svc_req *rqstp, SVCXPRT *transp)
- svcerr_decode(transp);
- if (debugging)
- (void) xlog(LOG_DEBUG, "rpcbind: could not decode");
-- return;
-+ goto done;
- }
-
- if (rqstp->rq_proc == RPCBPROC_SET
-diff --git a/src/rpcb_svc_4.c b/src/rpcb_svc_4.c
-index 5094879..eebbbbe 100644
---- a/src/rpcb_svc_4.c
-+++ b/src/rpcb_svc_4.c
-@@ -218,7 +218,7 @@ rpcb_service_4(struct svc_req *rqstp, SVCXPRT *transp)
- svcerr_decode(transp);
- if (debugging)
- (void) xlog(LOG_DEBUG, "rpcbind: could not decode\n");
-- return;
-+ goto done;
- }
-
- if (rqstp->rq_proc == RPCBPROC_SET
-diff --git a/src/rpcb_svc_com.c b/src/rpcb_svc_com.c
-index 5862c26..cb63afd 100644
---- a/src/rpcb_svc_com.c
-+++ b/src/rpcb_svc_com.c
-@@ -927,6 +927,14 @@ error:
- if (call_msg.rm_xid != 0)
- (void) free_slot_by_xid(call_msg.rm_xid);
- out:
-+ if (!svc_freeargs(transp, (xdrproc_t) xdr_rmtcall_args, (char *) &a)) {
-+ if (debugging) {
-+ (void) xlog(LOG_DEBUG, "unable to free arguments\n");
-+ if (doabort) {
-+ rpcbind_abort();
-+ }
-+ }
-+ }
- if (local_uaddr)
- free(local_uaddr);
- if (buf_alloc)
---
-1.9.1
-
+++ /dev/null
-From 7c7590ad536c0e24bef790cb1e65702fc54db566 Mon Sep 17 00:00:00 2001
-From: Steve Dickson <steved@redhat.com>
-Date: Tue, 30 May 2017 11:27:22 -0400
-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>
-
-Upstream-Status: Backport
-
-Signed-off-by: Jackie Huang <jackie.huang@windriver.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 cb63afd..1fc2229 100644
---- a/src/rpcb_svc_com.c
-+++ b/src/rpcb_svc_com.c
-@@ -612,9 +612,9 @@ 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;
-@@ -635,36 +635,10 @@ 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);
-@@ -704,7 +678,8 @@ 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);
-@@ -937,8 +912,6 @@ out:
- }
- if (local_uaddr)
- free(local_uaddr);
-- if (buf_alloc)
-- free(buf_alloc);
- if (outbuf_alloc)
- free(outbuf_alloc);
- if (na) {
---
-2.7.4
-
projects / thirdparty / openembedded / openembedded-core-contrib.git / commitdiff
