Ensure that the port number and TXID are properly randomized.

This fix reads from /dev/urandom to get the required entropy.

Bug: 6535492
Change-Id: Ibc2fec3f71a67607b608ad9b767b0b6504993c1d

libc/SYSCALLS.TXT

@@ -251,6 +251,7 @@ int     init_module(void *, unsigned long, const char *)  128
 int     delete_module(const char*, unsigned int)   129
 int     klogctl:syslog(int, char *, int)   103
 int     sysinfo(struct sysinfo *)  116
+int     personality(unsigned long)  136
 
 # futex
 int	futex(void *, int, int, void *, void *, int) 240

libc/arch-arm/syscalls.mk

@@ -169,6 +169,7 @@ syscall_src += arch-arm/syscalls/init_module.S
 syscall_src += arch-arm/syscalls/delete_module.S
 syscall_src += arch-arm/syscalls/klogctl.S
 syscall_src += arch-arm/syscalls/sysinfo.S
+syscall_src += arch-arm/syscalls/personality.S
 syscall_src += arch-arm/syscalls/futex.S
 syscall_src += arch-arm/syscalls/epoll_create.S
 syscall_src += arch-arm/syscalls/epoll_ctl.S

libc/arch-arm/syscalls/personality.S

@@ -0,0 +1,14 @@
+/* autogenerated by gensyscalls.py */
+#include <machine/asm.h>
+#include <sys/linux-syscalls.h>
+
+ENTRY(personality)
+    .save   {r4, r7}
+    stmfd   sp!, {r4, r7}
+    ldr     r7, =__NR_personality
+    swi     #0
+    ldmfd   sp!, {r4, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+END(personality)

libc/arch-sh/syscalls.mk

@@ -158,6 +158,7 @@ syscall_src += arch-sh/syscalls/init_module.S
 syscall_src += arch-sh/syscalls/delete_module.S
 syscall_src += arch-sh/syscalls/klogctl.S
 syscall_src += arch-sh/syscalls/sysinfo.S
+syscall_src += arch-sh/syscalls/personality.S
 syscall_src += arch-sh/syscalls/futex.S
 syscall_src += arch-sh/syscalls/epoll_create.S
 syscall_src += arch-sh/syscalls/epoll_ctl.S

libc/arch-sh/syscalls/personality.S

@@ -0,0 +1,32 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type personality, @function
+    .globl personality
+    .align 4
+
+personality:
+
+    /* invoke trap */
+    mov.l   0f, r3  /* trap num */
+    trapa   #(1 + 0x10)
+
+    /* check return value */
+    cmp/pz  r0
+    bt      __NR_personality_end
+
+    /* keep error number */
+    sts.l   pr, @-r15
+    mov.l   1f, r1
+    jsr     @r1
+    mov     r0, r4
+    lds.l   @r15+, pr
+
+__NR_personality_end:
+    rts
+    nop
+
+    .align  2
+0:  .long   __NR_personality
+1:  .long   __set_syscall_errno

libc/arch-x86/syscalls.mk

@@ -172,6 +172,7 @@ syscall_src += arch-x86/syscalls/init_module.S
 syscall_src += arch-x86/syscalls/delete_module.S
 syscall_src += arch-x86/syscalls/klogctl.S
 syscall_src += arch-x86/syscalls/sysinfo.S
+syscall_src += arch-x86/syscalls/personality.S
 syscall_src += arch-x86/syscalls/futex.S
 syscall_src += arch-x86/syscalls/epoll_create.S
 syscall_src += arch-x86/syscalls/epoll_ctl.S

libc/arch-x86/syscalls/personality.S

@@ -0,0 +1,23 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+    .text
+    .type personality, @function
+    .globl personality
+    .align 4
+
+personality:
+    pushl   %ebx
+    mov     8(%esp), %ebx
+    movl    $__NR_personality, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    popl    %ebx
+    ret

libc/include/sys/linux-syscalls.h

@@ -132,6 +132,7 @@
 #define __NR_delete_module                (__NR_SYSCALL_BASE + 129)
 #define __NR_syslog                       (__NR_SYSCALL_BASE + 103)
 #define __NR_sysinfo                      (__NR_SYSCALL_BASE + 116)
+#define __NR_personality                  (__NR_SYSCALL_BASE + 136)
 #define __NR_futex                        (__NR_SYSCALL_BASE + 240)
 #define __NR_poll                         (__NR_SYSCALL_BASE + 168)
 

libc/include/sys/linux-unistd.h

@@ -199,6 +199,7 @@ int              init_module (void *, unsigned long, const char *);
 int              delete_module (const char*, unsigned int);
 int              klogctl (int, char *, int);
 int              sysinfo (struct sysinfo *);
+int              personality (unsigned long);
 int              futex (void *, int, int, void *, void *, int);
 int              epoll_create (int size);
 int              epoll_ctl (int epfd, int op, int fd, struct epoll_event *event);

libc/include/sys/personality.h

@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _SYS_PERSONALITY_H_
+#define _SYS_PERSONALITY_H_
+
+__BEGIN_DECLS
+
+/* constants taken from linux-3.0.4/include/linux/personality.h */
+
+enum {
+        UNAME26 =               0x0020000,
+        ADDR_NO_RANDOMIZE =     0x0040000,
+        FDPIC_FUNCPTRS =        0x0080000,
+        MMAP_PAGE_ZERO =        0x0100000,
+        ADDR_COMPAT_LAYOUT =    0x0200000,
+        READ_IMPLIES_EXEC =     0x0400000,
+        ADDR_LIMIT_32BIT =      0x0800000,
+        SHORT_INODE =           0x1000000,
+        WHOLE_SECONDS =         0x2000000,
+        STICKY_TIMEOUTS =       0x4000000,
+        ADDR_LIMIT_3GB =        0x8000000,
+};
+
+#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC  | \
+                            ADDR_NO_RANDOMIZE  | \
+                            ADDR_COMPAT_LAYOUT | \
+                            MMAP_PAGE_ZERO)
+
+enum {
+        PER_LINUX =             0x0000,
+        PER_LINUX_32BIT =       0x0000 | ADDR_LIMIT_32BIT,
+        PER_LINUX_FDPIC =       0x0000 | FDPIC_FUNCPTRS,
+        PER_SVR4 =              0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
+        PER_SVR3 =              0x0002 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_SCOSVR3 =           0x0003 | STICKY_TIMEOUTS |
+                                         WHOLE_SECONDS | SHORT_INODE,
+        PER_OSR5 =              0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS,
+        PER_WYSEV386 =          0x0004 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_ISCR4 =             0x0005 | STICKY_TIMEOUTS,
+        PER_BSD =               0x0006,
+        PER_SUNOS =             0x0006 | STICKY_TIMEOUTS,
+        PER_XENIX =             0x0007 | STICKY_TIMEOUTS | SHORT_INODE,
+        PER_LINUX32 =           0x0008,
+        PER_LINUX32_3GB =       0x0008 | ADDR_LIMIT_3GB,
+        PER_IRIX32 =            0x0009 | STICKY_TIMEOUTS,
+        PER_IRIXN32 =           0x000a | STICKY_TIMEOUTS,
+        PER_IRIX64 =            0x000b | STICKY_TIMEOUTS,
+        PER_RISCOS =            0x000c,
+        PER_SOLARIS =           0x000d | STICKY_TIMEOUTS,
+        PER_UW7 =               0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO,
+        PER_OSF4 =              0x000f,
+        PER_HPUX =              0x0010,
+        PER_MASK =              0x00ff,
+};
+
+extern int personality (unsigned long persona);
+
+__END_DECLS
+
+#endif /* _SYS_PERSONALITY_H_ */

libc/netbsd/resolv/res_init.c

@@ -99,6 +99,8 @@ __RCSID("$NetBSD: res_init.c,v 1.8 2006/03/19 03:10:08 christos Exp $");
 #include <netdb.h>
 
 #ifdef ANDROID_CHANGES
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/system_properties.h>
 #endif /* ANDROID_CHANGES */
 
@@ -716,10 +718,44 @@ net_mask(in)		/* XXX - should really use system's version of this */
 	return (htonl(IN_CLASSC_NET));
 }
 
+#ifdef ANDROID_CHANGES
+static int
+real_randomid(u_int *random_value) {
+	/* open the nonblocking random device, returning -1 on failure */
+	int random_device = open("/dev/urandom", O_RDONLY);
+	if (random_device < 0) {
+		return -1;
+	}
+
+	/* read from the random device, returning -1 on failure (or too many retries)*/
+	u_int retry = 5;
+	for (retry; retry > 0; retry--) {
+		int retval = read(random_device, random_value, sizeof(u_int));
+		if (retval == sizeof(u_int)) {
+			*random_value &= 0xffff;
+			close(random_device);
+			return 0;
+		} else if ((retval < 0) && (errno != EINTR)) {
+			break;
+		}
+	}
+
+	close(random_device);
+	return -1;
+}
+#endif /* ANDROID_CHANGES */
+
 u_int
 res_randomid(void) {
+#ifdef ANDROID_CHANGES
+	int status = 0;
+	u_int output = 0;
+	status = real_randomid(&output);
+	if (status != -1) {
+		return output;
+	}
+#endif /* ANDROID_CHANGES */
 	struct timeval now;
-
 	gettimeofday(&now, NULL);
 	return (0xffff & (now.tv_sec ^ now.tv_usec ^ getpid()));
 }

libc/netbsd/resolv/res_send.c

@@ -99,6 +99,7 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
 #include <arpa/inet.h>
 
 #include <errno.h>
+#include <fcntl.h>
 #include <netdb.h>
 #ifdef ANDROID_CHANGES
 #include "resolv_private.h"
@@ -109,6 +110,7 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 #include <unistd.h>
 
 #include <isc/eventlib.h>
@@ -117,6 +119,8 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
 #  include <resolv_cache.h>
 #endif
 
+#include "logd.h"
+
 #ifndef DE_CONST
 #define DE_CONST(c,v)   v = ((c) ? \
     strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL)
@@ -130,6 +134,7 @@ __RCSID("$NetBSD: res_send.c,v 1.9 2006/01/24 17:41:25 christos Exp $");
 #include "res_private.h"
 
 #define EXT(res) ((res)->_u._ext)
+#define DBG 0
 
 static const int highestFD = FD_SETSIZE - 1;
 
@@ -152,7 +157,10 @@ static int		pselect(int, void *, void *, void *,
 				const sigset_t *);
 #endif
 void res_pquery(const res_state, const u_char *, int, FILE *);
-
+static int connect_with_timeout(int sock, const struct sockaddr *nsap,
+			socklen_t salen, int sec);
+static int retrying_select(const int sock, fd_set *readset, fd_set *writeset,
+			const struct timespec *finish);
 
 /* BIONIC-BEGIN: implement source port randomization */
 typedef union {
@@ -521,16 +529,23 @@ res_nsend(res_state statp,
 
 		Dprint(((statp->options & RES_DEBUG) &&
 			getnameinfo(nsap, (socklen_t)nsaplen, abuf, sizeof(abuf),
-				    NULL, 0, niflags) == 0),
+				NULL, 0, niflags) == 0),
-		       (stdout, ";; Querying server (# %d) address = %s\n",
+				(stdout, ";; Querying server (# %d) address = %s\n",
-			ns + 1, abuf));
+				ns + 1, abuf));
 
 
 		if (v_circuit) {
 			/* Use VC; at most one attempt per server. */
 			try = statp->retry;
+
 			n = send_vc(statp, buf, buflen, ans, anssiz, &terrno,
 				    ns);
+
+			if (DBG) {
+				__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+					"used send_vc %d\n", n);
+			}
+
 			if (n < 0)
 				goto fail;
 			if (n == 0)
@@ -538,12 +553,26 @@ res_nsend(res_state statp,
 			resplen = n;
 		} else {
 			/* Use datagrams. */
+			if (DBG) {
+				__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+					"using send_dg\n");
+			}
+
 			n = send_dg(statp, buf, buflen, ans, anssiz, &terrno,
 				    ns, &v_circuit, &gotsomewhere);
+			if (DBG) {
+				__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+					"used send_dg %d\n",n);
+			}
+
 			if (n < 0)
 				goto fail;
 			if (n == 0)
 				goto next_ns;
+			if (DBG) {
+				__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+					"time=%d, %d\n",time(NULL), time(NULL)%2);
+			}
 			if (v_circuit)
 				goto same_ns;
 			resplen = n;
@@ -668,6 +697,23 @@ get_nsaddr(statp, n)
 	}
 }
 
+static int get_timeout(const res_state statp, const int ns)
+{
+	int timeout = (statp->retrans << ns);
+	if (ns > 0) {
+		timeout /= statp->nscount;
+	}
+	if (timeout <= 0) {
+		timeout = 1;
+	}
+	if (DBG) {
+		__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+			"using timeout of %d sec\n", timeout);
+	}
+
+	return timeout;
+}
+
 static int
 send_vc(res_state statp,
 	const u_char *buf, int buflen, u_char *ans, int anssiz,
@@ -683,6 +729,10 @@ send_vc(res_state statp,
 	u_char *cp;
 	void *tmp;
 
+	if (DBG) {
+		__libc_android_log_print(ANDROID_LOG_DEBUG, "libc", "using send_vc\n");
+	}
+
 	nsap = get_nsaddr(statp, (size_t)ns);
 	nsaplen = get_salen(nsap);
 
@@ -735,7 +785,8 @@ send_vc(res_state statp,
 			res_nclose(statp);
 			return (0);
 		}
-		if (connect(statp->_vcsock, nsap, (socklen_t)nsaplen) < 0) {
+		if (connect_with_timeout(statp->_vcsock, nsap, (socklen_t)nsaplen,
+				get_timeout(statp, ns)) < 0) {
 			*terrno = errno;
 			Aerror(statp, stderr, "connect/vc", errno, nsap,
 			    nsaplen);
@@ -859,6 +910,111 @@ send_vc(res_state statp,
 	return (resplen);
 }
 
+/* return -1 on error (errno set), 0 on success */
+static int
+connect_with_timeout(int sock, const struct sockaddr *nsap, socklen_t salen, int sec)
+{
+	int res, origflags;
+	fd_set rset, wset;
+	struct timespec now, timeout, finish;
+
+	origflags = fcntl(sock, F_GETFL, 0);
+	fcntl(sock, F_SETFL, origflags | O_NONBLOCK);
+
+	res = connect(sock, nsap, salen);
+	if (res < 0 && errno != EINPROGRESS) {
+                res = -1;
+                goto done;
+	}
+	if (res != 0) {
+		now = evNowTime();
+		timeout = evConsTime((long)sec, 0L);
+		finish = evAddTime(now, timeout);
+		if (DBG) {
+			__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+				"  %d send_vc\n", sock);
+		}
+
+		res = retrying_select(sock, &rset, &wset, &finish);
+		if (res <= 0) {
+                        res = -1;
+		}
+	}
+done:
+	fcntl(sock, F_SETFL, origflags);
+	if (DBG) {
+		__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+			"  %d connect_with_timeout returning %s\n", sock, res);
+	}
+	return res;
+}
+
+static int
+retrying_select(const int sock, fd_set *readset, fd_set *writeset, const struct timespec *finish)
+{
+	struct timespec now, timeout;
+	int n, error;
+	socklen_t len;
+
+
+retry:
+	if (DBG) {
+		__libc_android_log_print(ANDROID_LOG_DEBUG, "libc", "  %d retying_select\n", sock);
+	}
+
+	now = evNowTime();
+	if (readset) {
+		FD_ZERO(readset);
+		FD_SET(sock, readset);
+	}
+	if (writeset) {
+		FD_ZERO(writeset);
+		FD_SET(sock, writeset);
+	}
+	if (evCmpTime(*finish, now) > 0)
+		timeout = evSubTime(*finish, now);
+	else
+		timeout = evConsTime(0L, 0L);
+
+	n = pselect(sock + 1, readset, writeset, NULL, &timeout, NULL);
+	if (n == 0) {
+		if (DBG) {
+			__libc_android_log_print(ANDROID_LOG_DEBUG, " libc",
+				"  %d retrying_select timeout\n", sock);
+		}
+		errno = ETIMEDOUT;
+		return 0;
+	}
+	if (n < 0) {
+		if (errno == EINTR)
+			goto retry;
+		if (DBG) {
+			__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+				"  %d retrying_select got error %d\n",sock, n);
+		}
+		return n;
+	}
+	if ((readset && FD_ISSET(sock, readset)) || (writeset && FD_ISSET(sock, writeset))) {
+		len = sizeof(error);
+		if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &error, &len) < 0 || error) {
+			errno = error;
+			if (DBG) {
+				__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+					"  %d retrying_select dot error2 %d\n", sock, errno);
+			}
+
+			return -1;
+		}
+	}
+	if (DBG) {
+		__libc_android_log_print(ANDROID_LOG_DEBUG, "libc",
+			"  %d retrying_select returning %d for %d\n",sock, n);
+	}
+
+	return n;
+}
+
+
 static int
 send_dg(res_state statp,
 	const u_char *buf, int buflen, u_char *ans, int anssiz,
@@ -944,33 +1100,19 @@ send_dg(res_state statp,
 	/*
 	 * Wait for reply.
 	 */
-	seconds = (statp->retrans << ns);
+	seconds = get_timeout(statp, ns);
-	if (ns > 0)
-		seconds /= statp->nscount;
-	if (seconds <= 0)
-		seconds = 1;
 	now = evNowTime();
 	timeout = evConsTime((long)seconds, 0L);
 	finish = evAddTime(now, timeout);
-	goto nonow;
+retry:
- wait:
+	n = retrying_select(s, &dsmask, NULL, &finish);
-	now = evNowTime();
+
- nonow:
-	FD_ZERO(&dsmask);
-	FD_SET(s, &dsmask);
-	if (evCmpTime(finish, now) > 0)
-		timeout = evSubTime(finish, now);
-	else
-		timeout = evConsTime(0L, 0L);
-	n = pselect(s + 1, &dsmask, NULL, NULL, &timeout, NULL);
 	if (n == 0) {
 		Dprint(statp->options & RES_DEBUG, (stdout, ";; timeout\n"));
 		*gotsomewhere = 1;
 		return (0);
 	}
 	if (n < 0) {
-		if (errno == EINTR)
-			goto wait;
 		Perror(statp, stderr, "select", errno);
 		res_nclose(statp);
 		return (0);
@@ -1006,7 +1148,7 @@ send_dg(res_state statp,
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; old answer:\n"),
 			ans, (resplen > anssiz) ? anssiz : resplen);
-		goto wait;
+		goto retry;
 	}
 	if (!(statp->options & RES_INSECURE1) &&
 	    !res_ourserver_p(statp, (struct sockaddr *)(void *)&from)) {
@@ -1019,7 +1161,7 @@ send_dg(res_state statp,
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; not our server:\n"),
 			ans, (resplen > anssiz) ? anssiz : resplen);
-		goto wait;
+		goto retry;
 	}
 #ifdef RES_USE_EDNS0
 	if (anhp->rcode == FORMERR && (statp->options & RES_USE_EDNS0) != 0U) {
@@ -1049,7 +1191,7 @@ send_dg(res_state statp,
 			(statp->pfcode & RES_PRF_REPLY),
 			(stdout, ";; wrong query name:\n"),
 			ans, (resplen > anssiz) ? anssiz : resplen);
-		goto wait;
+		goto retry;;
 	}
 	if (anhp->rcode == SERVFAIL ||
 	    anhp->rcode == NOTIMP ||

libc/zoneinfo/zoneinfo.version

@@ -1 +1 @@
-2011l
+2011n