* File locking and emacs_readlinkat
@ 2013-02-25 17:57 Eli Zaretskii
2013-02-25 18:14 ` Andreas Schwab
0 siblings, 1 reply; 2+ messages in thread
From: Eli Zaretskii @ 2013-02-25 17:57 UTC (permalink / raw)
To: emacs-devel
On Posix platforms, we use emacs_readlinkat in filelock.c to read
information about a locked file. That information is encoded as the
name of the target of the symlink, and it has the following format:
USER@HOST.PID:BOOT-TIME
However, emacs_readlinkat has a special feature up its sleeve intended
to support symlinks to remote files:
val = build_string (buf);
if (buf[0] == '/' && strchr (buf, ':'))
val = concat2 (build_string ("/:"), val);
But since in the case of filelock.c, the target of the symlink is not
a file name at all, couldn't this magic cause surprising effects for
unusual USER names? Can a user name on a Posix system begin with a
slash?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: File locking and emacs_readlinkat
2013-02-25 17:57 File locking and emacs_readlinkat Eli Zaretskii
@ 2013-02-25 18:14 ` Andreas Schwab
0 siblings, 0 replies; 2+ messages in thread
From: Andreas Schwab @ 2013-02-25 18:14 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: emacs-devel
Eli Zaretskii <eliz@gnu.org> writes:
> Can a user name on a Posix system begin with a slash?
No.
Andreas.
--
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-02-25 17:57 File locking and emacs_readlinkat Eli Zaretskii
2013-02-25 18:14 ` Andreas Schwab
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