From: Andrey Repin <anrdaemon@yandex.ru>
To: "Lavrentiev, Anton (NIH/NLM/NCBI) [C]" <lavr@ncbi.nlm.nih.gov>,
cygwin@cygwin.com
Subject: Re: [EXTERNAL] Re: Weird issue with file permissions
Date: Sun, 3 Jul 2022 01:01:16 +0300 [thread overview]
Message-ID: <1358206197.20220703010116@yandex.ru> (raw)
In-Reply-To: <DM8PR09MB7095B72B7F58F581D3A21B97A5BC9@DM8PR09MB7095.namprd09.prod.outlook.com>
Greetings, Lavrentiev, Anton (NIH/NLM/NCBI) [C]!
>> what your test program was actually doing. But you seem to be assuming that
>> calling fchmod on a socket descriptor should affect the permissions on the
>> socket file (assuming the socket is bound). Is that documented anywhere? POSIX
>> says that the behavior of fchmod on a socket descriptor is unspecified
> The socket file descriptor for a bound UNIX sockets refers to an object in a filesystem
> (it's practically a file), which the bind() system call creates. The access to the socket
> is controlled by the permission bits, when someone actually tries to connect to it,
Which is not necessarily related to the permissions on the file. Windows
socket is an in-memory object, the file is used merely for naming purposes.
> so permissions should be working for these objects (otherwise, there's no other way!)
Does the not? Can you connect to a socket with user that should not have
permissions after you have changed them?
> And fchmod() for a bound Unix socket works on Linux and many other Unix flavors, actually.
"Works", all right. But HOW does it works? Aren't the permissions seen on the
socket file merely a coincidence/convenience?
--
With best regards,
Andrey Repin
Sunday, July 3, 2022 00:57:58
Sorry for my terrible english...
prev parent reply other threads:[~2022-07-02 22:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-02 16:16 Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2022-07-02 18:41 ` Ken Brown
2022-07-02 19:37 ` [EXTERNAL] " Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2022-07-02 21:58 ` Ken Brown
2022-07-02 22:01 ` Andrey Repin [this message]
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