void CrasherTest::FinishCrasher() {
if (crasher_pipe == -1) {
FAIL() << "crasher pipe uninitialized";
}
ssize_t rc = write(crasher_pipe.get(), "\n", 1);
if (rc == -1) {
FAIL() << "failed to write to crasher pipe: " << strerror(errno);
} else if (rc == 0) {
FAIL() << "crasher pipe was closed";
}
}
static void abort_handler(pid_t target, const bool tombstoned_connected,
unique_fd& tombstoned_socket, unique_fd& output_fd,
const char* abort_msg) {
// If we abort before we get an output fd, contact tombstoned to let any
// potential listeners know that we failed.
if (!tombstoned_connected) {
if (!tombstoned_connect(target, &tombstoned_socket, &output_fd, kDebuggerdAnyIntercept)) {
// We failed to connect, not much we can do.
LOG(ERROR) << "failed to connected to tombstoned to report failure";
_exit(1);
}
}
dprintf(output_fd.get(), "crash_dump failed to dump process");
if (target != 1) {
dprintf(output_fd.get(), " %d: %s\n", target, abort_msg);
} else {
dprintf(output_fd.get(), ": %s\n", abort_msg);
}
_exit(1);
}
void CrasherTest::FinishIntercept(int* result) {
InterceptResponse response;
// Timeout for tombstoned intercept is 10 seconds.
ssize_t rc = TIMEOUT(20, read(intercept_fd.get(), &response, sizeof(response)));
if (rc == -1) {
FAIL() << "failed to read response from tombstoned: " << strerror(errno);
} else if (rc == 0) {
*result = -1;
} else if (rc != sizeof(response)) {
FAIL() << "received packet of unexpected length from tombstoned: expected " << sizeof(response)
<< ", received " << rc;
} else {
*result = response.status == InterceptStatus::kStarted ? 1 : 0;
}
}
void CrasherTest::StartProcess(std::function<void()> function, std::function<pid_t()> forker) {
unique_fd read_pipe;
unique_fd crasher_read_pipe;
if (!Pipe(&crasher_read_pipe, &crasher_pipe)) {
FAIL() << "failed to create pipe: " << strerror(errno);
}
crasher_pid = forker();
if (crasher_pid == -1) {
FAIL() << "fork failed: " << strerror(errno);
} else if (crasher_pid == 0) {
char dummy;
crasher_pipe.reset();
TEMP_FAILURE_RETRY(read(crasher_read_pipe.get(), &dummy, 1));
function();
_exit(0);
}
}
static void ConsumeFd(unique_fd fd, std::string* output) {
constexpr size_t read_length = PAGE_SIZE;
std::string result;
while (true) {
size_t offset = result.size();
result.resize(result.size() + PAGE_SIZE);
ssize_t rc = TEMP_FAILURE_RETRY(read(fd.get(), &result[offset], read_length));
if (rc == -1) {
FAIL() << "read failed: " << strerror(errno);
} else if (rc == 0) {
result.resize(result.size() - PAGE_SIZE);
break;
}
result.resize(result.size() - PAGE_SIZE + rc);
}
*output = std::move(result);
}
inline void swap(unique_fd& a, unique_fd& b) noexcept
{
a.swap(b);
}
void remount_service(unique_fd fd, const std::string& cmd) {
bool user_requested_reboot = cmd == "-R";
if (getuid() != 0) {
WriteFdExactly(fd.get(), "Not running as root. Try \"adb root\" first.\n");
return;
}
bool system_verified = !(android::base::GetProperty("partition.system.verified", "").empty());
bool vendor_verified = !(android::base::GetProperty("partition.vendor.verified", "").empty());
std::vector<std::string> partitions{"/", "/odm", "/oem", "/product_services",
"/product", "/vendor"};
bool verity_enabled = (system_verified || vendor_verified);
// If we can use overlayfs, lets get it in place first
// before we struggle with determining deduplication operations.
if (!verity_enabled && fs_mgr_overlayfs_setup()) {
Fstab fstab;
if (ReadDefaultFstab(&fstab) && fs_mgr_overlayfs_mount_all(&fstab)) {
WriteFdExactly(fd.get(), "overlayfs mounted\n");
}
}
// Find partitions that are deduplicated, and can be un-deduplicated.
std::set<std::string> dedup;
for (const auto& part : partitions) {
auto partition = part;
if ((part == "/") && !find_mount("/system", false).empty()) partition = "/system";
std::string dev = find_mount(partition.c_str(), partition == "/");
if (dev.empty() || !fs_mgr_has_shared_blocks(partition, dev)) {
continue;
}
if (can_unshare_blocks(fd.get(), dev.c_str())) {
dedup.emplace(partition);
}
}
// Reboot now if the user requested it (and an operation needs a reboot).
if (user_requested_reboot) {
if (!dedup.empty() || verity_enabled) {
if (verity_enabled) {
set_verity_enabled_state_service(unique_fd(dup(fd.get())), false);
}
reboot_for_remount(fd.get(), !dedup.empty());
return;
}
WriteFdExactly(fd.get(), "No reboot needed, skipping -R.\n");
}
// If we need to disable-verity, but we also need to perform a recovery
// fsck for deduplicated partitions, hold off on warning about verity. We
// can handle both verity and the recovery fsck in the same reboot cycle.
if (verity_enabled && dedup.empty()) {
// Allow remount but warn of likely bad effects
bool both = system_verified && vendor_verified;
WriteFdFmt(fd.get(), "dm_verity is enabled on the %s%s%s partition%s.\n",
system_verified ? "system" : "", both ? " and " : "",
vendor_verified ? "vendor" : "", both ? "s" : "");
WriteFdExactly(fd.get(),
"Use \"adb disable-verity\" to disable verity.\n"
"If you do not, remount may succeed, however, you will still "
"not be able to write to these volumes.\n");
WriteFdExactly(fd.get(),
"Alternately, use \"adb remount -R\" to disable verity "
"and automatically reboot.\n");
}
bool success = true;
for (const auto& partition : partitions) {
// Don't try to remount partitions that need an fsck in recovery.
if (dedup.count(partition)) {
continue;
}
success &= remount_partition(fd.get(), partition.c_str());
}
if (!dedup.empty()) {
WriteFdExactly(fd.get(),
"The following partitions are deduplicated and cannot "
"yet be remounted:\n");
for (const std::string& name : dedup) {
WriteFdFmt(fd.get(), " %s\n", name.c_str());
}
WriteFdExactly(fd.get(),
"To reboot and un-deduplicate the listed partitions, "
"please retry with adb remount -R.\n");
if (system_verified || vendor_verified) {
WriteFdExactly(fd.get(), "Note: verity will be automatically disabled after reboot.\n");
}
return;
}
if (!success) {
WriteFdExactly(fd.get(), "remount failed\n");
} else {
WriteFdExactly(fd.get(), "remount succeeded\n");
}
}
void framebuffer_service(unique_fd fd) {
struct fbinfo fbinfo;
unsigned int i, bsize;
char buf[640];
int fd_screencap;
int w, h, f, c;
int fds[2];
pid_t pid;
if (pipe2(fds, O_CLOEXEC) < 0) return;
pid = fork();
if (pid < 0) goto done;
if (pid == 0) {
dup2(fds[1], STDOUT_FILENO);
adb_close(fds[0]);
adb_close(fds[1]);
const char* command = "screencap";
const char *args[2] = {command, nullptr};
execvp(command, (char**)args);
perror_exit("exec screencap failed");
}
adb_close(fds[1]);
fd_screencap = fds[0];
/* read w, h, format & color space */
if(!ReadFdExactly(fd_screencap, &w, 4)) goto done;
if(!ReadFdExactly(fd_screencap, &h, 4)) goto done;
if(!ReadFdExactly(fd_screencap, &f, 4)) goto done;
if(!ReadFdExactly(fd_screencap, &c, 4)) goto done;
fbinfo.version = DDMS_RAWIMAGE_VERSION;
fbinfo.colorSpace = c;
/* see hardware/hardware.h */
switch (f) {
case 1: /* RGBA_8888 */
fbinfo.bpp = 32;
fbinfo.size = w * h * 4;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 0;
fbinfo.red_length = 8;
fbinfo.green_offset = 8;
fbinfo.green_length = 8;
fbinfo.blue_offset = 16;
fbinfo.blue_length = 8;
fbinfo.alpha_offset = 24;
fbinfo.alpha_length = 8;
break;
case 2: /* RGBX_8888 */
fbinfo.bpp = 32;
fbinfo.size = w * h * 4;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 0;
fbinfo.red_length = 8;
fbinfo.green_offset = 8;
fbinfo.green_length = 8;
fbinfo.blue_offset = 16;
fbinfo.blue_length = 8;
fbinfo.alpha_offset = 24;
fbinfo.alpha_length = 0;
break;
case 3: /* RGB_888 */
fbinfo.bpp = 24;
fbinfo.size = w * h * 3;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 0;
fbinfo.red_length = 8;
fbinfo.green_offset = 8;
fbinfo.green_length = 8;
fbinfo.blue_offset = 16;
fbinfo.blue_length = 8;
fbinfo.alpha_offset = 24;
fbinfo.alpha_length = 0;
break;
case 4: /* RGB_565 */
fbinfo.bpp = 16;
fbinfo.size = w * h * 2;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 11;
fbinfo.red_length = 5;
fbinfo.green_offset = 5;
fbinfo.green_length = 6;
fbinfo.blue_offset = 0;
fbinfo.blue_length = 5;
fbinfo.alpha_offset = 0;
fbinfo.alpha_length = 0;
break;
case 5: /* BGRA_8888 */
fbinfo.bpp = 32;
fbinfo.size = w * h * 4;
fbinfo.width = w;
fbinfo.height = h;
fbinfo.red_offset = 16;
fbinfo.red_length = 8;
fbinfo.green_offset = 8;
fbinfo.green_length = 8;
fbinfo.blue_offset = 0;
fbinfo.blue_length = 8;
fbinfo.alpha_offset = 24;
fbinfo.alpha_length = 8;
break;
default:
goto done;
}
/* write header */
if (!WriteFdExactly(fd.get(), &fbinfo, sizeof(fbinfo))) goto done;
/* write data */
for(i = 0; i < fbinfo.size; i += bsize) {
bsize = sizeof(buf);
if (i + bsize > fbinfo.size)
bsize = fbinfo.size - i;
if(!ReadFdExactly(fd_screencap, buf, bsize)) goto done;
if (!WriteFdExactly(fd.get(), buf, bsize)) goto done;
}
done:
adb_close(fds[0]);
TEMP_FAILURE_RETRY(waitpid(pid, nullptr, 0));
}