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WS-2021-0119
Good to know:
Date: May 21, 2021
Processes using tableflip may encounter hung goroutines in the parent process, after a failed upgrade. The problem has been fixed in v1.2.1 The Go runtime has annoying behaviour around setting and clearing O_NONBLOCK: exec.Cmd.Start() ends up calling os.File.Fd() for any file in exec.Cmd.ExtraFiles. os.File.Fd() disables both the use of the runtime poller for the file and clears O_NONBLOCK from the underlying open file descriptor. This can lead to goroutines hanging in a parent process, after at least one failed upgrade. The bug manifests in goroutines which rely on either a deadline or interruption via Close() to be unblocked being stuck in read or accept like syscalls. As far as I can tell we've not experienced this problem in production, so it's most likely quite rare.
Language: Go
Severity Score
Severity Score
Weakness Type (CWE)
Deadlock
CWE-833Top Fix
CVSS v3.1
Base Score: |
|
---|---|
Attack Vector (AV): | LOCAL |
Attack Complexity (AC): | LOW |
Privileges Required (PR): | NONE |
User Interaction (UI): | NONE |
Scope (S): | UNCHANGED |
Confidentiality (C): | NONE |
Integrity (I): | NONE |
Availability (A): | LOW |