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gh-96819: multiprocessing.resource_tracker: check if length of pipe write <= 512 (#96890)

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Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>
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Koki Saito 2022-10-03 09:41:01 +09:00 • committed by GitHub
parent 14d4f68ebb
commit 19ca114645
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3 changed files with 11 additions and 2 deletions
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4
Lib/multiprocessing/resource_tracker.py
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@ -161,10 +161,10 @@ class ResourceTracker(object):
def _send(self, cmd, name, rtype):
self.ensure_running()
msg = '{0}:{1}:{2}\n'.format(cmd, name, rtype).encode('ascii')
if len(name) > 512:
if len(msg) > 512:
# posix guarantees that writes to a pipe of less than PIPE_BUF
# bytes are atomic, and that PIPE_BUF >= 512
raise ValueError('name too long')
raise ValueError('msg too long')
nbytes = os.write(self._fd, msg)
assert nbytes == len(msg), "nbytes {0:n} but len(msg) {1:n}".format(
nbytes, len(msg))