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Re: [HACKERS] Moving tablespaces

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Andrew Dunstan <andrew(at)dunslane(dot)net>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] Moving tablespaces
Date: 2011-12-06 16:07:56
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-docspgsql-hackers
Magnus Hagander <magnus(at)hagander(dot)net> writes:
> There is some nice precedent in the CREATE TABLESPACE command (though
> dependent on HAVE_SYMLINK and not HAVE_READLINK), so I'm just going to
> copy the error message from there.

Fair enough.

Looking at the existing readlink use in port/exec.c, it strikes me that
another thing you'd better do is include a check for buffer overrun,
ie the test needs to be more like

		rllen = readlink(fname, link_buf, sizeof(link_buf));
		if (rllen < 0 || rllen >= sizeof(link_buf))
			... fail ...

Also, you're assuming that the result is already null-terminated,
which is incorrect.

			regards, tom lane

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