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538 lines
12 KiB
538 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#define _GNU_SOURCE |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <pthread.h> |
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#include <sched.h> |
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#include <stdbool.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <sys/fsuid.h> |
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#include <sys/ioctl.h> |
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#include <sys/mount.h> |
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#include <sys/socket.h> |
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#include <sys/stat.h> |
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#include <sys/sysinfo.h> |
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#include <sys/types.h> |
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#include <sys/wait.h> |
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#include <unistd.h> |
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#include <linux/android/binder.h> |
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#include <linux/android/binderfs.h> |
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#include "../../kselftest_harness.h" |
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#define DEFAULT_THREADS 4 |
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#define PTR_TO_INT(p) ((int)((intptr_t)(p))) |
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#define INT_TO_PTR(u) ((void *)((intptr_t)(u))) |
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#define close_prot_errno_disarm(fd) \ |
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if (fd >= 0) { \ |
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int _e_ = errno; \ |
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close(fd); \ |
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errno = _e_; \ |
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fd = -EBADF; \ |
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} |
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static void change_mountns(struct __test_metadata *_metadata) |
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{ |
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int ret; |
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ret = unshare(CLONE_NEWNS); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to unshare mount namespace", |
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strerror(errno)); |
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} |
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ret = mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, 0); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to mount / as private", |
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strerror(errno)); |
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} |
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} |
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static int __do_binderfs_test(struct __test_metadata *_metadata) |
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{ |
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int fd, ret, saved_errno, result = 1; |
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size_t len; |
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ssize_t wret; |
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struct binderfs_device device = { 0 }; |
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struct binder_version version = { 0 }; |
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char binderfs_mntpt[] = P_tmpdir "/binderfs_XXXXXX", |
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device_path[sizeof(P_tmpdir "/binderfs_XXXXXX/") + BINDERFS_MAX_NAME]; |
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static const char * const binder_features[] = { |
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"oneway_spam_detection", |
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}; |
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change_mountns(_metadata); |
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EXPECT_NE(mkdtemp(binderfs_mntpt), NULL) { |
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TH_LOG("%s - Failed to create binderfs mountpoint", |
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strerror(errno)); |
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goto out; |
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} |
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ret = mount(NULL, binderfs_mntpt, "binder", 0, 0); |
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EXPECT_EQ(ret, 0) { |
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if (errno == ENODEV) |
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SKIP(goto out, "binderfs missing"); |
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TH_LOG("%s - Failed to mount binderfs", strerror(errno)); |
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goto rmdir; |
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} |
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/* success: binderfs mounted */ |
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memcpy(device.name, "my-binder", strlen("my-binder")); |
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snprintf(device_path, sizeof(device_path), "%s/binder-control", binderfs_mntpt); |
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fd = open(device_path, O_RDONLY | O_CLOEXEC); |
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EXPECT_GE(fd, 0) { |
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TH_LOG("%s - Failed to open binder-control device", |
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strerror(errno)); |
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goto umount; |
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} |
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ret = ioctl(fd, BINDER_CTL_ADD, &device); |
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saved_errno = errno; |
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close(fd); |
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errno = saved_errno; |
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EXPECT_GE(ret, 0) { |
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TH_LOG("%s - Failed to allocate new binder device", |
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strerror(errno)); |
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goto umount; |
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} |
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TH_LOG("Allocated new binder device with major %d, minor %d, and name %s", |
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device.major, device.minor, device.name); |
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/* success: binder device allocation */ |
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snprintf(device_path, sizeof(device_path), "%s/my-binder", binderfs_mntpt); |
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fd = open(device_path, O_CLOEXEC | O_RDONLY); |
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EXPECT_GE(fd, 0) { |
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TH_LOG("%s - Failed to open my-binder device", |
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strerror(errno)); |
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goto umount; |
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} |
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ret = ioctl(fd, BINDER_VERSION, &version); |
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saved_errno = errno; |
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close(fd); |
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errno = saved_errno; |
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EXPECT_GE(ret, 0) { |
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TH_LOG("%s - Failed to open perform BINDER_VERSION request", |
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strerror(errno)); |
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goto umount; |
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} |
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TH_LOG("Detected binder version: %d", version.protocol_version); |
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/* success: binder transaction with binderfs binder device */ |
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ret = unlink(device_path); |
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EXPECT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to delete binder device", |
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strerror(errno)); |
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goto umount; |
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} |
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/* success: binder device removal */ |
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snprintf(device_path, sizeof(device_path), "%s/binder-control", binderfs_mntpt); |
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ret = unlink(device_path); |
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EXPECT_NE(ret, 0) { |
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TH_LOG("Managed to delete binder-control device"); |
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goto umount; |
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} |
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EXPECT_EQ(errno, EPERM) { |
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TH_LOG("%s - Failed to delete binder-control device but exited with unexpected error code", |
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strerror(errno)); |
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goto umount; |
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} |
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/* success: binder-control device removal failed as expected */ |
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for (int i = 0; i < ARRAY_SIZE(binder_features); i++) { |
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snprintf(device_path, sizeof(device_path), "%s/features/%s", |
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binderfs_mntpt, binder_features[i]); |
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fd = open(device_path, O_CLOEXEC | O_RDONLY); |
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EXPECT_GE(fd, 0) { |
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TH_LOG("%s - Failed to open binder feature: %s", |
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strerror(errno), binder_features[i]); |
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goto umount; |
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} |
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close(fd); |
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} |
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/* success: binder feature files found */ |
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result = 0; |
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umount: |
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ret = umount2(binderfs_mntpt, MNT_DETACH); |
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EXPECT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to unmount binderfs", strerror(errno)); |
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} |
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rmdir: |
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ret = rmdir(binderfs_mntpt); |
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EXPECT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to rmdir binderfs mount", strerror(errno)); |
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} |
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out: |
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return result; |
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} |
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static int wait_for_pid(pid_t pid) |
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{ |
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int status, ret; |
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again: |
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ret = waitpid(pid, &status, 0); |
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if (ret == -1) { |
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if (errno == EINTR) |
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goto again; |
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return -1; |
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} |
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if (!WIFEXITED(status)) |
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return -1; |
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return WEXITSTATUS(status); |
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} |
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static int setid_userns_root(void) |
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{ |
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if (setuid(0)) |
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return -1; |
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if (setgid(0)) |
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return -1; |
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setfsuid(0); |
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setfsgid(0); |
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return 0; |
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} |
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enum idmap_type { |
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UID_MAP, |
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GID_MAP, |
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}; |
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static ssize_t read_nointr(int fd, void *buf, size_t count) |
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{ |
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ssize_t ret; |
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again: |
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ret = read(fd, buf, count); |
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if (ret < 0 && errno == EINTR) |
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goto again; |
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return ret; |
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} |
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static ssize_t write_nointr(int fd, const void *buf, size_t count) |
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{ |
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ssize_t ret; |
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again: |
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ret = write(fd, buf, count); |
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if (ret < 0 && errno == EINTR) |
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goto again; |
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return ret; |
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} |
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static int write_id_mapping(enum idmap_type type, pid_t pid, const char *buf, |
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size_t buf_size) |
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{ |
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int fd; |
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int ret; |
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char path[4096]; |
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if (type == GID_MAP) { |
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int setgroups_fd; |
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snprintf(path, sizeof(path), "/proc/%d/setgroups", pid); |
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setgroups_fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); |
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if (setgroups_fd < 0 && errno != ENOENT) |
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return -1; |
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if (setgroups_fd >= 0) { |
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ret = write_nointr(setgroups_fd, "deny", sizeof("deny") - 1); |
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close_prot_errno_disarm(setgroups_fd); |
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if (ret != sizeof("deny") - 1) |
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return -1; |
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} |
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} |
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switch (type) { |
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case UID_MAP: |
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ret = snprintf(path, sizeof(path), "/proc/%d/uid_map", pid); |
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break; |
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case GID_MAP: |
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ret = snprintf(path, sizeof(path), "/proc/%d/gid_map", pid); |
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break; |
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default: |
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return -1; |
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} |
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if (ret < 0 || ret >= sizeof(path)) |
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return -E2BIG; |
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fd = open(path, O_WRONLY | O_CLOEXEC | O_NOFOLLOW); |
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if (fd < 0) |
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return -1; |
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ret = write_nointr(fd, buf, buf_size); |
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close_prot_errno_disarm(fd); |
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if (ret != buf_size) |
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return -1; |
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return 0; |
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} |
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static void change_userns(struct __test_metadata *_metadata, int syncfds[2]) |
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{ |
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int ret; |
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char buf; |
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close_prot_errno_disarm(syncfds[1]); |
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ret = unshare(CLONE_NEWUSER); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to unshare user namespace", |
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strerror(errno)); |
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} |
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ret = write_nointr(syncfds[0], "1", 1); |
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ASSERT_EQ(ret, 1) { |
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TH_LOG("write_nointr() failed"); |
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} |
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ret = read_nointr(syncfds[0], &buf, 1); |
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ASSERT_EQ(ret, 1) { |
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TH_LOG("read_nointr() failed"); |
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} |
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close_prot_errno_disarm(syncfds[0]); |
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ASSERT_EQ(setid_userns_root(), 0) { |
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TH_LOG("setid_userns_root() failed"); |
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} |
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} |
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static void change_idmaps(struct __test_metadata *_metadata, int syncfds[2], pid_t pid) |
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{ |
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int ret; |
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char buf; |
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char id_map[4096]; |
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close_prot_errno_disarm(syncfds[0]); |
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ret = read_nointr(syncfds[1], &buf, 1); |
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ASSERT_EQ(ret, 1) { |
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TH_LOG("read_nointr() failed"); |
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} |
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snprintf(id_map, sizeof(id_map), "0 %d 1\n", getuid()); |
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ret = write_id_mapping(UID_MAP, pid, id_map, strlen(id_map)); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("write_id_mapping(UID_MAP) failed"); |
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} |
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snprintf(id_map, sizeof(id_map), "0 %d 1\n", getgid()); |
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ret = write_id_mapping(GID_MAP, pid, id_map, strlen(id_map)); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("write_id_mapping(GID_MAP) failed"); |
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} |
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ret = write_nointr(syncfds[1], "1", 1); |
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ASSERT_EQ(ret, 1) { |
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TH_LOG("write_nointr() failed"); |
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} |
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close_prot_errno_disarm(syncfds[1]); |
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} |
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struct __test_metadata *_thread_metadata; |
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static void *binder_version_thread(void *data) |
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{ |
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struct __test_metadata *_metadata = _thread_metadata; |
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int fd = PTR_TO_INT(data); |
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struct binder_version version = { 0 }; |
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int ret; |
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ret = ioctl(fd, BINDER_VERSION, &version); |
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if (ret < 0) |
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TH_LOG("%s - Failed to open perform BINDER_VERSION request\n", |
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strerror(errno)); |
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pthread_exit(data); |
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} |
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/* |
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* Regression test: |
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* 2669b8b0c798 ("binder: prevent UAF for binderfs devices") |
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* f0fe2c0f050d ("binder: prevent UAF for binderfs devices II") |
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* 211b64e4b5b6 ("binderfs: use refcount for binder control devices too") |
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*/ |
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TEST(binderfs_stress) |
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{ |
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int fds[1000]; |
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int syncfds[2]; |
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pid_t pid; |
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int fd, ret; |
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size_t len; |
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struct binderfs_device device = { 0 }; |
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char binderfs_mntpt[] = P_tmpdir "/binderfs_XXXXXX", |
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device_path[sizeof(P_tmpdir "/binderfs_XXXXXX/") + BINDERFS_MAX_NAME]; |
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ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, syncfds); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to create socket pair", strerror(errno)); |
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} |
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pid = fork(); |
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ASSERT_GE(pid, 0) { |
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TH_LOG("%s - Failed to fork", strerror(errno)); |
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close_prot_errno_disarm(syncfds[0]); |
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close_prot_errno_disarm(syncfds[1]); |
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} |
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if (pid == 0) { |
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int i, j, k, nthreads; |
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pthread_attr_t attr; |
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pthread_t threads[DEFAULT_THREADS]; |
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change_userns(_metadata, syncfds); |
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change_mountns(_metadata); |
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ASSERT_NE(mkdtemp(binderfs_mntpt), NULL) { |
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TH_LOG("%s - Failed to create binderfs mountpoint", |
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strerror(errno)); |
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} |
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ret = mount(NULL, binderfs_mntpt, "binder", 0, 0); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to mount binderfs", strerror(errno)); |
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} |
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for (int i = 0; i < ARRAY_SIZE(fds); i++) { |
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snprintf(device_path, sizeof(device_path), |
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"%s/binder-control", binderfs_mntpt); |
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fd = open(device_path, O_RDONLY | O_CLOEXEC); |
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ASSERT_GE(fd, 0) { |
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TH_LOG("%s - Failed to open binder-control device", |
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strerror(errno)); |
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} |
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memset(&device, 0, sizeof(device)); |
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snprintf(device.name, sizeof(device.name), "%d", i); |
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ret = ioctl(fd, BINDER_CTL_ADD, &device); |
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close_prot_errno_disarm(fd); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to allocate new binder device", |
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strerror(errno)); |
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} |
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snprintf(device_path, sizeof(device_path), "%s/%d", |
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binderfs_mntpt, i); |
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fds[i] = open(device_path, O_RDONLY | O_CLOEXEC); |
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ASSERT_GE(fds[i], 0) { |
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TH_LOG("%s - Failed to open binder device", strerror(errno)); |
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} |
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} |
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ret = umount2(binderfs_mntpt, MNT_DETACH); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to unmount binderfs", strerror(errno)); |
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rmdir(binderfs_mntpt); |
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} |
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nthreads = get_nprocs_conf(); |
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if (nthreads > DEFAULT_THREADS) |
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nthreads = DEFAULT_THREADS; |
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_thread_metadata = _metadata; |
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pthread_attr_init(&attr); |
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for (k = 0; k < ARRAY_SIZE(fds); k++) { |
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for (i = 0; i < nthreads; i++) { |
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ret = pthread_create(&threads[i], &attr, binder_version_thread, INT_TO_PTR(fds[k])); |
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if (ret) { |
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TH_LOG("%s - Failed to create thread %d", |
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strerror(errno), i); |
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break; |
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} |
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} |
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for (j = 0; j < i; j++) { |
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void *fdptr = NULL; |
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ret = pthread_join(threads[j], &fdptr); |
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if (ret) |
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TH_LOG("%s - Failed to join thread %d for fd %d", |
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strerror(errno), j, PTR_TO_INT(fdptr)); |
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} |
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} |
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pthread_attr_destroy(&attr); |
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for (k = 0; k < ARRAY_SIZE(fds); k++) |
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close(fds[k]); |
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exit(EXIT_SUCCESS); |
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} |
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change_idmaps(_metadata, syncfds, pid); |
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ret = wait_for_pid(pid); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("wait_for_pid() failed"); |
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} |
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} |
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TEST(binderfs_test_privileged) |
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{ |
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if (geteuid() != 0) |
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SKIP(return, "Tests are not run as root. Skipping privileged tests"); |
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if (__do_binderfs_test(_metadata)) |
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SKIP(return, "The Android binderfs filesystem is not available"); |
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} |
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TEST(binderfs_test_unprivileged) |
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{ |
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int ret; |
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int syncfds[2]; |
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pid_t pid; |
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ret = socketpair(PF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0, syncfds); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("%s - Failed to create socket pair", strerror(errno)); |
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} |
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pid = fork(); |
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ASSERT_GE(pid, 0) { |
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close_prot_errno_disarm(syncfds[0]); |
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close_prot_errno_disarm(syncfds[1]); |
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TH_LOG("%s - Failed to fork", strerror(errno)); |
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} |
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if (pid == 0) { |
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change_userns(_metadata, syncfds); |
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if (__do_binderfs_test(_metadata)) |
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exit(2); |
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exit(EXIT_SUCCESS); |
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} |
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change_idmaps(_metadata, syncfds, pid); |
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ret = wait_for_pid(pid); |
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if (ret) { |
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if (ret == 2) |
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SKIP(return, "The Android binderfs filesystem is not available"); |
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ASSERT_EQ(ret, 0) { |
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TH_LOG("wait_for_pid() failed"); |
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} |
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} |
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} |
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TEST_HARNESS_MAIN
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