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The runtime spec says that if umask is unspecified, it should not be changed from the calling process' umask. runc, though, sets the umask of the container init process to 0022 in this case (as it did before umask support was added, and as crun does, too). For runc exec, the umask is not changed. Document this deviation. Fixes #3533. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>