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Kernel: Accept SHUT_RD and SHUT_WR as shutdown() how values
The previous check for valid how values assumed this field was a bitmap and that SHUT_RDWR was simply a bitwise or of SHUT_RD and SHUT_WR, which is not the case.
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@ -160,7 +160,7 @@ ErrorOr<FlatPtr> Process::sys$shutdown(int sockfd, int how)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this)
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TRY(require_promise(Pledge::stdio));
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if (how & ~SHUT_RDWR)
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if (how != SHUT_RD && how != SHUT_WR && how != SHUT_RDWR)
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return EINVAL;
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auto description = TRY(open_file_description(sockfd));
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if (!description->is_socket())
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