Android: JNI WARNING: illegal start byte
文件名: 04 German-Deutsch Als Erdbeben werden messbare Erschütterungen des Erdkörpers bezeichnet. Der deutlich größte.txt 进入目录listfiles, 直接挂掉: W/dalvikvm( 452): JNI WARNING: illegal start byte 0xfc W/dalvikvm( 452): string: '04 German-Deutsch Als Erdbeben werden messbare Erschngen des Erdk bezeichnet. Der deutlich grp3' W/dalvikvm( 452): in Ljava/io/File;.listImpl ([B)[Ljava/lang/String; (NewStringUTF) 转帖一篇，解决方法: http://hi.baidu.com/aokikyon/blog/item/df8b5822ad64b0a94623e8be.html Android Wifi bug——JNI WARNING illegal start byte 2010-07-15 11:01 在调试Wifi时，一旦开始搜索Wifi，系统就会down掉，打开debug信息，发现如下内容 I/ActivityManager( 825): Starting activity: Intent { act=android.intent.action.MAIN cmp=com.android.settings/.wifi.WifiSettings } D/dalvikvm( 893): GC freed 3772 objects / 231344 bytes in 79ms D/SettingsWifiEnabler( 893): Received wifi state changed from Enabling to Enabled I/ActivityManager( 825): Displayed activity com.android.settings/.wifi.WifiSettings: 707 ms (total 707 ms) I/wpa_supplicant( 966): CTRL-EVENT-SCAN-RESULTS Ready V/WifiStateTracker( 825): Connection to supplicant established, state=SCANNING D/NetworkStateTracker( 825): setDetailed state, old =IDLE and new state=SCANNING D/ConnectivityService( 825): ConnectivityChange for WIFI: DISCONNECTED/SCANNING D/DataConnectionTracker( 875): enableApnType(default), isApnTypeActive = false and state = IDLE I/wpa_supplicant( 966): CTRL-EVENT-SCAN-RESULTS Ready W/dalvikvm( 825): JNI WARNING: illegal start byte 0xb3 W/dalvikvm( 825): string: 'bssid / frequency / signal level / flags / ssid W/dalvikvm( 825): 00:10:18:00:00:b6 2437 171 wireless W/dalvikvm( 825): 02:2c:7c:04:c7:01 2437 169 [IBSS] WZD-成人教育学院' W/dalvikvm( 825): in Landroid/net/wifi/WifiNative;.scanResultsCommand ()Ljava/lang/String; (NewStringUTF) I/dalvikvm( 825): "Binder Thread #5" prio=5 tid=63 NATIVE I/dalvikvm( 825): | group="main" sCount=0 dsCount=0 s=N obj=0x43a5ea30 self=0x3b1178 I/dalvikvm( 825): | sysTid=911 nice=0 sched=0/0 cgrp=unknown handle=3871032 I/dalvikvm( 825): at android.net.wifi.WifiNative.scanResultsCommand(Native Method) I/dalvikvm( 825): at com.android.server.WifiService.getScanResults(WifiService.java:1050) I/dalvikvm( 825): at android.net.wifi.IWifiManager$Stub.onTransact(IWifiManager.java:126) I/dalvikvm( 825): at android.os.Binder.execTransact(Binder.java:287) I/dalvikvm( 825): at dalvik.system.NativeStart.run(Native Method) I/dalvikvm( 825): E/dalvikvm( 825): VM aborting I/DEBUG ( 811): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** I/DEBUG ( 811): Build fingerprint: 'ky6410/ky6410/ky6410/:2.1-update1/ECLAIR/eng.kyon.20100609.214617:eng/test-keys' I/DEBUG ( 811): pid: 825, tid: 911 >>> system_server > 4) { case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: { // Bit pattern 0xxx. No need for any extra bytes. break; } case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0f: { /* * Bit pattern 10xx or 1111, which are illegal start bytes. * Note: 1111 is valid for normal UTF-8, but not the * modified UTF-8 used here. */ LOGW("JNI WARNING: illegal start byte 0x%x/n", utf8); goto fail; } case 0x0e: { // Bit pattern 1110, so there are two additional bytes. utf8 = *(bytes++); if ((utf8 & 0xc0) != 0x80) { LOGW("JNI WARNING: illegal continuation byte 0x%x/n", utf8); goto fail; } // Fall through to take care of the final byte. } case 0x0c: case 0x0d: { // Bit pattern 110x, so there is one additional byte. utf8 = *(bytes++); if ((utf8 & 0xc0) != 0x80) { LOGW("JNI WARNING: illegal continuation byte 0x%x/n", utf8); goto fail; } break; } } } return; fail: LOGW(" string: '%s'/n", origBytes); showLocation(dvmGetCurrentJNIMethod(), func); abortMaybe(); } 如果出现非法的UTF8字符就挂掉，这个也太狠了吧。 继续追踪根源，非法UTF8字符提交来自/frameworks/base/core/jni/android_net_wifi_Wifi.cpp的函数 // Send a command to the supplicant, and return the reply as a String static jstring doStringCommand(JNIEnv *env, const char *cmd) { char reply[4096]; if (doCommand(cmd, reply, sizeof(reply)) != 0) { return env->NewStringUTF(NULL); } else { return env->NewStringUTF(reply); } } 网上提出的解决方案是将非法头字符修正为“？”，将其他非法字符修正为“0x80”，patch后的函数如下： // Send a command to the supplicant, and return the reply as a String static jstring doStringCommand(JNIEnv *env, const char *cmd) { char reply[4096]; char* bytes; if (doCommand(cmd, reply, sizeof(reply)) != 0) { return env->NewStringUTF(NULL); } else { // Make sure reply only contains valid UTF-8 Characters // This is borrowed from CheckJni.c bytes = reply; while (*bytes != '/0') { char utf8 = *bytes; switch (utf8 >> 4) { case 0x00: case 0x01: case 0x02: case 0x03: case 0x04: case 0x05: case 0x06: case 0x07: { // Bit pattern 0xxx. No need for any extra bytes. break; } case 0x08: case 0x09: case 0x0a: case 0x0b: case 0x0f: { /* * Bit pattern 10xx or 1111, which are illegal start bytes. * Note: 1111 is valid for normal UTF-8, but not the * modified UTF-8 used here. + */ LOGW("JNI WARNING: illegal start byte 0x%x, changing to '?'/n", utf8); //return env->NewStringUTF("AP"); //modify by rockie *bytes = '?'; } case 0x0e: { // Bit pattern 1110, so there are two additional bytes. utf8 = *(++bytes); if ((utf8 & 0xc0) != 0x80) { LOGW("JNI WARNING: illegal continuation byte 0x%x, changing to 0x80./n", utf8); *bytes = 0x80; } // Fall through to take care of the final byte. } case 0x0c: case 0x0d: { // Bit pattern 110x, so there is one additional byte. utf8 = *(++bytes); if ((utf8 & 0xc0) != 0x80) { LOGW("JNI WARNING: illegal continuation byte 0x%x, changing to 0x80./n", utf8); *bytes = 0x80; } break; } } bytes++; } return env->NewStringUTF(reply); } } 非常不解的是，patch后还是会有漏网的错误字符被提交到checkjni.c，导致系统挂掉 D/wpa_supplicant( 976): Setting scan request: 5 sec 0 usec W/wifi ( 826): JNI WARNING: illegal start byte 0xb3, changing to '?' W/wifi ( 826): JNI WARNING: illegal continuation byte 0xc9, changing to 0x80. W/wifi ( 826): JNI WARNING: illegal continuation byte 0xc8, changing to 0x80. W/wifi ( 826): JNI WARNING: illegal continuation byte 0xd3, changing to 0x80. W/wifi ( 826): JNI WARNING: illegal start byte 0xfd, changing to '?' W/wifi ( 826): JNI WARNING: illegal continuation byte 0xd1, changing to 0x80. W/dalvikvm( 826): JNI WARNING by rockie : illegal start byte 0x80, changing to '?' W/dalvikvm( 826): JNI WARNING: illegal continuation byte 0xcb W/dalvikvm( 826): string: 'bssid / frequency / signal level / flags / ssid W/dalvikvm( 826): 00:21:91:6f:f1:f2 2437 205 dlink W/dalvikvm( 826): 00:10:18:00:00:b6 2437 175 wireless W/dalvikvm( 826): 02:2c:7c:04:c7:01 2437 169 [IBSS] WZD-? 私虁? г? W/dalvikvm( 826): in Landroid/net/wifi/WifiNative;.scanResultsCommand ()Ljava/lang/String; (NewStringUTF) I/dalvikvm( 826): "Binder Thread #6" prio=5 tid=67 NATIVE I/dalvikvm( 826): | group="main" sCount=0 dsCount=0 s=N obj=0x43a15cb8 self=0x3d68f0 I/dalvikvm( 826): | sysTid=951 nice=0 sched=0/0 cgrp=unknown handle=4069976 I/dalvikvm( 826): at android.net.wifi.WifiNative.scanResultsCommand(Native Method) I/dalvikvm( 826): at com.android.server.WifiService.getScanResults(WifiService.java:1050) I/dalvikvm( 826): at android.net.wifi.IWifiManager$Stub.onTransact(IWifiManager.java:126) I/dalvikvm( 826): at android.os.Binder.execTransact(Binder.java:287) I/dalvikvm( 826): at dalvik.system.NativeStart.run(Native Method) I/dalvikvm( 826): E/dalvikvm( 826): VM aborting I/DEBUG ( 811): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** I/DEBUG ( 811): Build fingerprint: 'ky6410/ky6410/ky6410/:2.1-update1/ECLAIR/eng.kyon.20100714.175405:eng/test-keys' I/DEBUG ( 811): pid: 826, tid: 951 >>> system_server