Author: delphij Date: Tue Sep 29 18:06:27 2015 New Revision: 288384 URL: https://svnweb.freebsd.org/changeset/base/288384
Log: The Sun RPC framework uses a netbuf structure to represent the transport specific form of a universal transport address. The structure is expected to be opaque to consumers. In the current implementation, the structure contains a pointer to a buffer that holds the actual address. In rpcbind(8), netbuf structures are copied directly, which would result in two netbuf structures that reference to one shared address buffer. When one of the two netbuf structures is freed, access to the other netbuf structure would result in an undefined result that may crash the rpcbind(8) daemon. Fix this by making a copy of the buffer that is going to be freed instead of doing a shallow copy. Security: FreeBSD-SA-15:24.rpcbind Security: CVE-2015-7236 Modified: stable/10/usr.sbin/rpcbind/rpcb_svc_com.c Changes in other areas also in this revision: Modified: stable/9/usr.sbin/rpcbind/rpcb_svc_com.c Modified: stable/10/usr.sbin/rpcbind/rpcb_svc_com.c ============================================================================== --- stable/10/usr.sbin/rpcbind/rpcb_svc_com.c Tue Sep 29 18:05:54 2015 (r288383) +++ stable/10/usr.sbin/rpcbind/rpcb_svc_com.c Tue Sep 29 18:06:27 2015 (r288384) @@ -48,6 +48,7 @@ #include <rpc/rpc.h> #include <rpc/rpcb_prot.h> #include <rpc/svc_dg.h> +#include <assert.h> #include <netconfig.h> #include <errno.h> #include <syslog.h> @@ -1048,19 +1049,31 @@ netbufcmp(struct netbuf *n1, struct netb return ((n1->len != n2->len) || memcmp(n1->buf, n2->buf, n1->len)); } +static bool_t +netbuf_copybuf(struct netbuf *dst, const struct netbuf *src) +{ + + assert(dst->buf == NULL); + + if ((dst->buf = malloc(src->len)) == NULL) + return (FALSE); + + dst->maxlen = dst->len = src->len; + memcpy(dst->buf, src->buf, src->len); + return (TRUE); +} + static struct netbuf * netbufdup(struct netbuf *ap) { struct netbuf *np; - if ((np = malloc(sizeof(struct netbuf))) == NULL) + if ((np = calloc(1, sizeof(struct netbuf))) == NULL) return (NULL); - if ((np->buf = malloc(ap->len)) == NULL) { + if (netbuf_copybuf(np, ap) == FALSE) { free(np); return (NULL); } - np->maxlen = np->len = ap->len; - memcpy(np->buf, ap->buf, ap->len); return (np); } @@ -1068,6 +1081,7 @@ static void netbuffree(struct netbuf *ap) { free(ap->buf); + ap->buf = NULL; free(ap); } @@ -1185,7 +1199,7 @@ xprt_set_caller(SVCXPRT *xprt, struct fi { u_int32_t *xidp; - *(svc_getrpccaller(xprt)) = *(fi->caller_addr); + netbuf_copybuf(svc_getrpccaller(xprt), fi->caller_addr); xidp = __rpcb_get_dg_xidp(xprt); *xidp = fi->caller_xid; } _______________________________________________ svn-src-stable-10@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-stable-10 To unsubscribe, send any mail to "svn-src-stable-10-unsubscr...@freebsd.org"