Fix possible login(1) argument injection in telnetd(8). [SA-16:36]

Fix link_ntoa(3) buffer overflow in libc. [SA-16:37]
Fix possible escape from bhyve(8) virtual machine. [SA-16:38]
Fix warnings about valid time zone abbreviations. [EN-16:19]
Update timezone database information. [EN-16:20]

Security:	FreeBSD-SA-16:36.telnetd
Security:	FreeBSD-SA-16:37.libc
Security:	FreeBSD-SA-16:38.bhyve
Errata Notice:	FreeBSD-EN-16:19.tzcode
Errata Notice:	FreeBSD-EN-16:20.tzdata
Approved by:	so

2 files changed, 42 insertions, 20 deletions

diff --git a/lib/libc/net/linkaddr.c b/lib/libc/net/linkaddr.c
index 5be6e74..f14f22d 100644
--- a/lib/libc/net/linkaddr.c
+++ b/lib/libc/net/linkaddr.c
@@ -35,6 +35,7 @@ __FBSDID("$FreeBSD$");
 
 #include <sys/types.h>
 #include <sys/socket.h>
+#include <net/if.h>
 #include <net/if_dl.h>
 #include <string.h>
 
@@ -125,31 +126,47 @@ link_ntoa(sdl)
 	const struct sockaddr_dl *sdl;
 {
 	static char obuf[64];
-	char *out = obuf;
-	int i;
-	u_char *in = (u_char *)LLADDR(sdl);
-	u_char *inlim = in + sdl->sdl_alen;
-	int firsttime = 1;
+	_Static_assert(sizeof(obuf) >= IFNAMSIZ + 20, "obuf is too small");
+	char *out;
+	const char *in, *inlim;
+	int namelen, i, rem;
 
-	if (sdl->sdl_nlen) {
-		bcopy(sdl->sdl_data, obuf, sdl->sdl_nlen);
-		out += sdl->sdl_nlen;
-		if (sdl->sdl_alen)
+	namelen = (sdl->sdl_nlen <= IFNAMSIZ) ? sdl->sdl_nlen : IFNAMSIZ;
+
+	out = obuf;
+	rem = sizeof(obuf);
+	if (namelen > 0) {
+		bcopy(sdl->sdl_data, out, namelen);
+		out += namelen;
+		rem -= namelen;
+		if (sdl->sdl_alen > 0) {
 			*out++ = ':';
+			rem--;
+		}
 	}
-	while (in < inlim) {
-		if (firsttime)
-			firsttime = 0;
-		else
+
+	in = (const char *)sdl->sdl_data + sdl->sdl_nlen;
+	inlim = in + sdl->sdl_alen;
+
+	while (in < inlim && rem > 1) {
+		if (in != (const char *)sdl->sdl_data + sdl->sdl_nlen) {
 			*out++ = '.';
+			rem--;
+		}
 		i = *in++;
 		if (i > 0xf) {
-			out[1] = hexlist[i & 0xf];
+			if (rem < 3)
+				break;
+			*out++ = hexlist[i & 0xf];
 			i >>= 4;
-			out[0] = hexlist[i];
-			out += 2;
-		} else
 			*out++ = hexlist[i];
+			rem -= 2;
+		} else {
+			if (rem < 2)
+				break;
+			*out++ = hexlist[i];
+			rem++;
+		}
 	}
 	*out = 0;
 	return (obuf);
diff --git a/lib/libvmmapi/vmmapi.c b/lib/libvmmapi/vmmapi.c
index fb8eb78..33a3b44 100644
--- a/lib/libvmmapi/vmmapi.c
+++ b/lib/libvmmapi/vmmapi.c
@@ -427,13 +427,18 @@ vm_map_gpa(struct vmctx *ctx, vm_paddr_t gaddr, size_t len)
 {
 
 	if (ctx->lowmem > 0) {
-		if (gaddr < ctx->lowmem && gaddr + len <= ctx->lowmem)
+		if (gaddr < ctx->lowmem && len <= ctx->lowmem &&
+		    gaddr + len <= ctx->lowmem)
 			return (ctx->baseaddr + gaddr);
 	}
 
 	if (ctx->highmem > 0) {
-		if (gaddr >= 4*GB && gaddr + len <= 4*GB + ctx->highmem)
-			return (ctx->baseaddr + gaddr);
+                if (gaddr >= 4*GB) {
+			if (gaddr < 4*GB + ctx->highmem &&
+			    len <= ctx->highmem &&
+			    gaddr + len <= 4*GB + ctx->highmem)
+				return (ctx->baseaddr + gaddr);
+		}
 	}
 
 	return (NULL);