问题
Daer all. I'm facing problem during trying Android CTS(4.4 R3).
the whole of error logs are like below:
01-22 17:19:44.844 D/ (22802): isPermittedCapBitSet(): getxattr("/system/bin/run-as") call failed: return -1 (error: No data available (61))
01-22 17:19:44.844 I/TestRunner(22802): failed: testRunAsHasCorrectCapabilities(android.permission.cts.FileSystemPermissionTest)
01-22 17:19:44.844 I/TestRunner(22802): ----- begin exception -----
01-22 17:19:44.844 I/TestRunner(22802):
01-22 17:19:44.844 I/TestRunner(22802): junit.framework.AssertionFailedError
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.Assert.fail(Assert.java:48)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.Assert.assertTrue(Assert.java:20)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.Assert.assertTrue(Assert.java:27)
01-22 17:19:44.844 I/TestRunner(22802): at android.permission.cts.FileSystemPermissionTest.testRunAsHasCorrectCapabilities(FileSystemPermissionTest.java:828)
01-22 17:19:44.844 I/TestRunner(22802): at java.lang.reflect.Method.invokeNative(Native Method)
01-22 17:19:44.844 I/TestRunner(22802): at java.lang.reflect.Method.invoke(Method.java:515)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestCase.runTest(TestCase.java:168)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestCase.runBare(TestCase.java:134)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestResult$1.protect(TestResult.java:115)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestResult.runProtected(TestResult.java:133)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestResult.run(TestResult.java:118)
01-22 17:19:44.844 I/TestRunner(22802): at junit.framework.TestCase.run(TestCase.java:124)
01-22 17:19:44.844 I/TestRunner(22802): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:191)
01-22 17:19:44.844 I/TestRunner(22802): at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:176)
01-22 17:19:44.844 I/TestRunner(22802): at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:554)
01-22 17:19:44.844 I/TestRunner(22802): at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1701)
01-22 17:19:44.844 I/TestRunner(22802): ----- end exceptbinder: release 22792:22801 transaction 150222 in, still active
I traced what function cause these errors
/cts/tests/tests/permission/jni/android_permission_cts_FileUtils.cpp
95 static jboolean isPermittedCapBitSet(JNIEnv* env, jstring path, size_t capId)
96 {
97 const char* pathStr = env->GetStringUTFChars(path, NULL);
98 jboolean ret = false;
99
100 struct vfs_cap_data capData;
101 memset(&capData, 0, sizeof(capData));
102
103 ssize_t result = getxattr(pathStr, XATTR_NAME_CAPS, &capData,
104 sizeof(capData));
105 if (result > 0) {
106 ret = (capData.data[CAP_TO_INDEX(capId)].permitted &
107 CAP_TO_MASK(capId)) != 0;
108 ALOGD("isPermittedCapBitSet(): getxattr(\"%s\") call succeeded, "
109 "cap bit %u %s",
110 pathStr, capId, ret ? "set" : "unset");
111 } else {
112 ALOGD("isPermittedCapBitSet(): getxattr(\"%s\") call failed: "
113 "return %d (error: %s (%d))\n",
114 pathStr, result, strerror(errno), errno);
115 }
116
117 env->ReleaseStringUTFChars(path, pathStr);
118 return ret;
119 }
120
The error made by getxattr().
I don't know what should I do. I already checked /system/bin/run-as. It exists and has connect permission and ownership
root@123:/ # ls -al /system/bin/run-as
-rwxr-x--- root shell 9500 2015-01-21 14:54 run-as
Please let me teach what should I check ? Thanks
回答1:
I think you may need to recompile your kernel with eXtended ATTRibutes (xattr) enabled. For the ext3 filesystem, the config value in .config is:
CONFIG_EXT3_FS_XATTR
But, in your linux source tree, type
make menuconfig
and use that interface to enable extended attributes for the file system(s) you are using. Then recompile your kernel after that.
来源：https://stackoverflow.com/questions/28084348/whats-the-meaning-no-data-available61-during-getxattr-system-call