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* bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument
@ 2015-11-04 20:31 Cornelius Mika
  2015-11-04 21:01 ` Eli Zaretskii
  0 siblings, 1 reply; 4+ messages in thread
From: Cornelius Mika @ 2015-11-04 20:31 UTC (permalink / raw)
  To: 21831

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start-process normalizes the given PROGRAM path by destructively modifying
its contents.
This is problematic if the path variable is reused later on.

Minimal repro:
(let ((path "c:/Windows/System32/clip.exe"))
  (start-process "" nil path)
  path) ; => "c:\\Windows\\System32\\clip.exe"

In GNU Emacs 24.5.1 (i686-pc-mingw32)
 of 2015-04-11 on LEG570
Windowing system distributor `Microsoft Corp.', version 6.3.9600
Configured using:
 `configure --prefix=/c/usr --host=i686-pc-mingw32'

Important settings:
  value of $LANG: DEU
  locale-coding-system: cp1252

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
easymenu mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util help-fns mail-prsvr mail-utils time-date tooltip electric
uniquify ediff-hook vc-hooks lisp-float-type mwheel dos-w32 ls-lisp
w32-common-fns disp-table w32-win w32-vars tool-bar dnd fontset image
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page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core frame cham georgian utf-8-lang
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sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process w32notify w32
multi-tty emacs)

Memory information:
((conses 8 73857 5808)
 (symbols 32 17432 0)
 (miscs 32 33 131)
 (strings 16 10612 4319)
 (string-bytes 1 268415)
 (vectors 8 9520)
 (vector-slots 4 383153 5554)
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 (intervals 28 196 45)
 (buffers 508 11))

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument
  2015-11-04 20:31 bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument Cornelius Mika
@ 2015-11-04 21:01 ` Eli Zaretskii
  2015-11-05  8:42   ` Nicolas Richard
  0 siblings, 1 reply; 4+ messages in thread
From: Eli Zaretskii @ 2015-11-04 21:01 UTC (permalink / raw)
  To: Cornelius Mika; +Cc: 21831-done

> From: Cornelius Mika <cornelius.mika@gmail.com>
> Date: Wed, 4 Nov 2015 21:31:55 +0100
> 
> start-process normalizes the given PROGRAM path by destructively modifying its
> contents.
> This is problematic if the path variable is reused later on.
> 
> Minimal repro:
> (let ((path "c:/Windows/System32/clip.exe"))
> (start-process "" nil path)
> path) ; => "c:\\Windows\\System32\\clip.exe"
> 
> In GNU Emacs 24.5.1 (i686-pc-mingw32)
> of 2015-04-11 on LEG570
> Windowing system distributor `Microsoft Corp.', version 6.3.9600
> Configured using:
> `configure --prefix=/c/usr --host=i686-pc-mingw32'

Thanks.

I can reproduce this in Emacs 24.5, but not in the current development
sources.  So this problem was already fixed as part of the development
since then, and I see the code which was added to avoid this.

So I'm marking this bug done.





^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument
  2015-11-04 21:01 ` Eli Zaretskii
@ 2015-11-05  8:42   ` Nicolas Richard
  2015-11-05 18:14     ` Eli Zaretskii
  0 siblings, 1 reply; 4+ messages in thread
From: Nicolas Richard @ 2015-11-05  8:42 UTC (permalink / raw)
  To: 21831; +Cc: cornelius.mika

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Cornelius Mika <cornelius.mika@gmail.com>
>> Minimal repro:
>> (let ((path "c:/Windows/System32/clip.exe"))
>> (start-process "" nil path)
>> path) ; => "c:\\Windows\\System32\\clip.exe"

> I can reproduce this in Emacs 24.5, but not in the current development
> sources.  So this problem was already fixed as part of the development
> since then, and I see the code which was added to avoid this.

Thanks for checking.
Did you see a test associated to this fix ?

perhaps something like :

(ert-deftest start-process-should-not-modify-arguments ()
  "`start-process' must not modify its arguments in-place."
  ;; See bug#21831.
  (let* ((path (pcase system-type
                 ('windows-nt  "c:/Windows/System32/clip.exe")
                 ('ms-dos "c:/command.com")
                 (_ "/bin//sh")))
         (samepath (copy-sequence path)))
    (start-process "" nil path)
    (should (equal path samepath))))

to be included in test/automated/process-tests.el

I'm not sure what a good value of `path' might be.

-- 
Nico.





^ permalink raw reply	[flat|nested] 4+ messages in thread

* bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument
  2015-11-05  8:42   ` Nicolas Richard
@ 2015-11-05 18:14     ` Eli Zaretskii
  0 siblings, 0 replies; 4+ messages in thread
From: Eli Zaretskii @ 2015-11-05 18:14 UTC (permalink / raw)
  To: Nicolas Richard; +Cc: cornelius.mika, 21831

> From: Nicolas Richard <youngfrog@members.fsf.org>
> Cc: eliz@gnu.org,  cornelius.mika@gmail.com
> Date: Thu, 05 Nov 2015 09:42:54 +0100
> 
> Did you see a test associated to this fix ?
> 
> perhaps something like :

Thanks, I pushed a variant of your suggested test.





^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2015-11-05 18:14 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-11-04 20:31 bug#21831: 24.5 on Windows; start-process modifies its PROGRAM argument Cornelius Mika
2015-11-04 21:01 ` Eli Zaretskii
2015-11-05  8:42   ` Nicolas Richard
2015-11-05 18:14     ` Eli Zaretskii

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