bug #17276 [Process] Fix potential race condition (nicolas-grekas)
This PR was merged into the 2.3 branch.
Discussion
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[Process] Fix potential race condition
| Q | A
| ------------- | ---
| Bug fix? | yes
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | -
| License | MIT
| Doc PR | -
As seen at https://travis-ci.org/symfony/symfony/jobs/100448880#L2768, ProcessTest::testRunProcessWithTimeout can create an infinite blocking situation.
I found two potential code paths that could be subject to a race condition. This fixes them.
Commits
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b114a85
[Process] Fix potential race condition
This commit is contained in:
commit
707d359c0c
@ -651,8 +651,12 @@ class Process
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}
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}
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$this->updateStatus(false);
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if ($this->processInformation['running']) {
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if ($this->isRunning()) {
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if (isset($this->fallbackStatus['pid'])) {
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unset($this->fallbackStatus['pid']);
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return $this->stop(0, $signal);
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}
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$this->close();
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}
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@ -1145,7 +1149,7 @@ class Process
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*/
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private function doSignal($signal, $throwException)
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{
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if (!$this->isRunning()) {
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if (null === $pid = $this->getPid()) {
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if ($throwException) {
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throw new LogicException('Can not send signal on a non running process.');
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}
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@ -1154,7 +1158,7 @@ class Process
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}
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if ('\\' === DIRECTORY_SEPARATOR) {
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exec(sprintf('taskkill /F /T /PID %d 2>&1', $this->getPid()), $output, $exitCode);
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exec(sprintf('taskkill /F /T /PID %d 2>&1', $pid), $output, $exitCode);
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if ($exitCode && $this->isRunning()) {
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if ($throwException) {
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throw new RuntimeException(sprintf('Unable to kill the process (%s).', implode(' ', $output)));
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@ -1166,8 +1170,8 @@ class Process
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if (!$this->enhanceSigchildCompatibility || !$this->isSigchildEnabled()) {
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$ok = @proc_terminate($this->process, $signal);
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} elseif (function_exists('posix_kill')) {
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$ok = @posix_kill($this->getPid(), $signal);
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} elseif ($ok = proc_open(sprintf('kill -%d %d', $signal, $this->getPid()), array(2 => array('pipe', 'w')), $pipes)) {
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$ok = @posix_kill($pid, $signal);
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} elseif ($ok = proc_open(sprintf('kill -%d %d', $signal, $pid), array(2 => array('pipe', 'w')), $pipes)) {
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$ok = false === fgets($pipes[2]);
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}
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if (!$ok) {
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@ -685,22 +685,16 @@ class ProcessTest extends \PHPUnit_Framework_TestCase
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*/
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public function testRunProcessWithTimeout()
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{
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$timeout = 0.1;
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$process = $this->getProcess(self::$phpBin.' -r "sleep(1);"');
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$process->setTimeout($timeout);
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$process = $this->getProcess(self::$phpBin.' -r "sleep(30);"');
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$process->setTimeout(0.1);
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$start = microtime(true);
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try {
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$process->run();
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$this->fail('A RuntimeException should have been raised');
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} catch (RuntimeException $e) {
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}
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$duration = microtime(true) - $start;
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if ('\\' !== DIRECTORY_SEPARATOR) {
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// On Windows, timers are too transient
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$maxDuration = $timeout + 2 * Process::TIMEOUT_PRECISION;
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$this->assertLessThan($maxDuration, $duration);
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}
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$this->assertLessThan(15, microtime(true) - $start);
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throw $e;
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}
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