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bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to
From: |
emacs |
Subject: |
bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely |
Date: |
Thu, 24 Oct 2013 14:42:08 -0400 |
Stefan Monnier wrote at about 13:57:13 -0400 on Thursday, October 24, 2013:
> > Specifically, gnutls-negotiate uses the Magic File associated
> > primitive file-exists-p to test for the existence of a file but
> > then passes off the unmodified (and non-existent) Magic File path
>
> Good point. The problem is the use of file-exists-p (which tests if
> Elisp code can reach this file) instead of another function along the
> lines of file-accessible-directory-p, which checks whether the file name
> is reachable to C-level system primitives.
Note that the predicate "file-accessible-directory-p" is also one of
the primitives that Magic File handlers are "required" to
address... so using "file-accessible-directory-p" would create the
same 'true' response for any valid Magic file path unless one were to
prevent Magic file handling by say wrapping the predicate in a 'let'
where file-name-handler-alist is set to nil).
> "Unmodified" is not a real problem, although we might want to use some
> function to "canonicalize" the file name so as to increase the chances
> that the file is reachable to C-level system primitives.
>
> > either (1) by using the Magic File aware primitive expand-file-name
>
> expand-file-name is not the right function, even if in some cases it may
> happen to help.
Why isn't it the right one?
The function name describes it as "Convert filename NAME to absolute,
and *canonicalize* it." (emphasis added)
It seems that any proper Magic File handler should (by definition)
hook into expand-file-name to provide an absolute canonicalized path,
so I would think if the handler is properly written, then it should
work (by definition).
Alternatively, how else would you recommend generally and portably
canonicalizing a Magic file path?
> > 2. At the C-code level, there is a bug in that passing a
> > non-existent/invalid file path may cause the entire Emacs code to
> > crash.
>
> Right, this is the most serious of the two problems.
>
Agreed.
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, (continued)
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Eli Zaretskii, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Ted Zlatanov, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Ted Zlatanov, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Ted Zlatanov, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Stefan Monnier, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely,
emacs <=
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Stefan Monnier, 2013/10/24
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/25
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Stefan Monnier, 2013/10/25
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/29
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Eli Zaretskii, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Eli Zaretskii, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, Eli Zaretskii, 2013/10/23
- bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, bug#15648: 24.2.50; gnutls SSL connection to IMAP server causes emacs to crash completely, emacs, 2013/10/24