all messages for Emacs-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
@ 2022-03-05 17:05 Philip Kaludercic
  2022-03-05 19:06 ` Lars Ingebrigtsen
  2022-03-06  9:56 ` Mattias Engdegård
  0 siblings, 2 replies; 10+ messages in thread
From: Philip Kaludercic @ 2022-03-05 17:05 UTC (permalink / raw)
  To: 54263

[-- Attachment #1: Type: text/plain, Size: 609 bytes --]


I am not certain if this is intended, but the "rgbi:" specifications
appear to tolerate whitespace

       (color-values-from-color-spec "rgbi:0/0/ 0")

despite not being documented.  From what I see, the issue stems from
parse_float_color_comp calling strtod, where strtod(3) says:

       The  expected  form of the (initial portion of the) string is op‐
       tional leading white space as recognized by  isspace(3) [...]

If this is considered to be an issue (I'd argue that relying a detail of
this kind in the libc could lead to problem), something like this could
solve the issue:


[-- Attachment #2: Type: text/plain, Size: 4717 bytes --]

diff --git a/src/xfaces.c b/src/xfaces.c
index cf155288bd..308509a026 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -220,6 +220,7 @@ Copyright (C) 1993-1994, 1998-2020 Free Software Foundation, Inc.
 #include "sysstdio.h"
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <math.h>
 
 #include "lisp.h"
 #include "character.h"
@@ -819,6 +820,120 @@ load_pixmap (struct frame *f, Lisp_Object name)
                             Color Handling
  ***********************************************************************/
 
+/* Parse hex color component at S ending right before E.
+   Set *DST to the value normalized so that the maximum for the
+   number of digits given becomes 65535, and return true on success,
+   false otherwise.  */
+static bool
+parse_hex_color_comp (const char *s, const char *e, unsigned short *dst)
+{
+  int n = e - s;
+  if (n <= 0 || n > 4)
+    return false;
+  int val = 0;
+  for (; s < e; s++)
+    {
+      int digit;
+      if (*s >= '0' && *s <= '9')
+        digit = *s - '0';
+      else if (*s >= 'A' && *s <= 'F')
+        digit = *s - 'A' + 10;
+      else if (*s >= 'a' && *s <= 'f')
+        digit = *s - 'a' + 10;
+      else
+        return false;
+      val = (val << 4) | digit;
+    }
+  int maxval = (1 << (n * 4)) - 1;
+  *dst = (unsigned)val * 65535 / maxval;
+  return true;
+}
+
+/* Parse floating-point color component at S ending right before E.
+   Return the number if in the range [0,1]; otherwise -1.  */
+static double
+parse_float_color_comp (const char *s, const char *e)
+{
+  char *end;
+  double x = strtod (s, &end);
+  return (end == e && x >= 0 && x <= 1) ? x : -1;
+}
+
+/* Parse S as a numeric color specification and set *R, *G and *B.
+   Return true on success, false on failure.
+   Recognized formats:
+
+    "#RGB", with R, G and B hex strings of equal length, 1-4 digits each
+    "rgb:R/G/B", with R, G and B hex strings, 1-4 digits each
+    "rgbi:R/G/B", with R, G and B numbers in [0,1]
+
+   The result is normalized to a maximum value of 65535 per component.  */
+bool
+parse_color_spec (const char *s,
+                  unsigned short *r, unsigned short *g, unsigned short *b)
+{
+  int len = strlen (s);
+  if (s[0] == '#')
+    {
+      if ((len - 1) % 3 == 0)
+        {
+          int n = (len - 1) / 3;
+          return (   parse_hex_color_comp (s + 1 + 0 * n, s + 1 + 1 * n, r)
+                  && parse_hex_color_comp (s + 1 + 1 * n, s + 1 + 2 * n, g)
+                  && parse_hex_color_comp (s + 1 + 2 * n, s + 1 + 3 * n, b));
+        }
+    }
+  else if (strncmp (s, "rgb:", 4) == 0)
+    {
+      char *sep1, *sep2;
+      return ((sep1 = strchr (s + 4, '/')) != NULL
+              && (sep2 = strchr (sep1 + 1, '/')) != NULL
+              && parse_hex_color_comp (s + 4, sep1, r)
+              && parse_hex_color_comp (sep1 + 1, sep2, g)
+              && parse_hex_color_comp (sep2 + 1, s + len, b));
+    }
+  else if (strncmp (s, "rgbi:", 5) == 0)
+    {
+      char *sep1, *sep2;
+      double red, green, blue;
+      if ((sep1 = strchr (s + 5, '/')) != NULL
+          && (sep2 = strchr (sep1 + 1, '/')) != NULL
+          && (red = parse_float_color_comp (s + 5, sep1)) >= 0
+          && (green = parse_float_color_comp (sep1 + 1, sep2)) >= 0
+          && (blue = parse_float_color_comp (sep2 + 1, s + len)) >= 0)
+        {
+          *r = lrint (red * 65535);
+          *g = lrint (green * 65535);
+          *b = lrint (blue * 65535);
+          return true;
+        }
+    }
+  return false;
+}
+
+DEFUN ("internal-color-values-from-color-spec",
+       Finternal_color_values_from_color_spec,
+       Sinternal_color_values_from_color_spec,
+       1, 1, 0,
+       doc: /* Parse STRING as a numeric color and return (RED GREEN BLUE).
+Recognised formats for STRING are:
+
+ #RGB, where R, G and B are hex numbers of equal length, 1-4 digits each
+ rgb:R/G/B, where R, G, and B are hex numbers, 1-4 digits each
+ rgbi:R/G/B, where R, G and B are floating-point numbers in [0,1]
+
+The result is normalized to a maximum value of 65535 per component,
+forming a list of three integers in [0,65535].
+If STRING is not in one of the above forms, return nil.  */)
+  (Lisp_Object string)
+{
+  CHECK_STRING (string);
+  unsigned short r, g, b;
+  return (parse_color_spec (SSDATA (string), &r, &g, &b)
+          ? list3i (r, g, b)
+          : Qnil);
+}
+
 /* Parse RGB_LIST, and fill in the RGB fields of COLOR.
    RGB_LIST should contain (at least) 3 lisp integers.
    Return true iff RGB_LIST is OK.  */
@@ -7018,4 +7133,5 @@ syms_of_xfaces (void)
   defsubr (&Sinternal_face_x_get_resource);
   defsubr (&Sx_family_fonts);
 #endif
+  defsubr (&Sinternal_color_values_from_color_spec);
 }

[-- Attachment #3: Type: text/plain, Size: 7564 bytes --]


In GNU Emacs 29.0.50 (build 13, x86_64-pc-linux-gnu, GTK+ Version 3.24.30, cairo version 1.16.0)
 of 2022-02-24 built on viero
Repository revision: bd17fa2c7565f180cedbfa396c0b159e144178cb
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LIBOTF LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM
GTK3 ZLIB

Important settings:
  value of $EMACSLOADPATH: 
  value of $LANG: en_US.utf8
  locale-coding-system: utf-8-unix

Major mode: ELisp/l

Minor modes in effect:
  TeX-PDF-mode: t
  rcirc-track-minor-mode: t
  global-git-commit-mode: t
  magit-auto-revert-mode: t
  auto-revert-mode: t
  shell-dirtrack-mode: t
  outline-minor-mode: t
  corfu-mode: t
  flymake-mode: t
  flyspell-mode: t
  recentf-mode: t
  repeat-mode: t
  display-battery-mode: t
  display-time-mode: t
  diff-hl-flydiff-mode: t
  diff-hl-mode: t
  winner-mode: t
  windmove-mode: t
  electric-pair-mode: t
  save-place-mode: t
  savehist-mode: t
  xterm-mouse-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tab-bar-mode: t
  file-name-shadow-mode: t
  context-menu-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  temp-buffer-resize-mode: t
  line-number-mode: t
  transient-mark-mode: t
  auto-save-visited-mode: t

Load-path shadows:
/home/philip/Source/sp-tutor/sp-tutor hides /home/philip/.config/emacs/site-lisp/sp-tutor/sp-tutor
/home/philip/Source/sp-tutor/waffel hides /home/philip/.config/emacs/site-lisp/sp-tutor/waffel
/home/philip/.config/emacs/elpa/transient-0.3.7/transient hides /home/philip/Source/emacs/lisp/transient
~/.config/emacs/site-lisp/autoload hides /home/philip/Source/emacs/lisp/emacs-lisp/autoload

Features:
(shadow emacsbug pcmpl-unix reposition tabify man preview tex-buf
tex-fold reftex-dcr reftex-auc reftex reftex-loaddefs reftex-vars
font-latex latex latex-flymake tex-ispell tex-style tex texmathp
tex-mode latexenc cl-print slime-tests ert debug backtrace slime gud
apropos arc-mode archive-mode hyperspec cl compat-macs org-element
avl-tree ol-eww eww xdg url-queue mm-url ol-rmail ol-mhe ol-irc ol-info
ol-gnus nnselect ol-docview ol-bibtex ol-bbdb ol-w3m ol-doi org-link-doi
org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-footnote
org-src ob-comint org-pcomplete org-list org-faces org-entities
org-version ob-emacs-lisp ob-core ob-eval org-table oc-basic bibtex ol
org-keys oc org-compat org-macs org-loaddefs cal-menu calendar
cal-loaddefs goto-addr shortdoc avy ffap grep mm-archive url-http url-gw
url-cache url-auth cus-edit finder-inf autoconf autoconf-mode whitespace
geiser-mode geiser-xref geiser-guile info-look geiser geiser-repl
geiser-compile geiser-debug geiser-image geiser-company geiser-doc
geiser-menu geiser-edit etags fileloop generator geiser-completion
geiser-autodoc advice geiser-eval geiser-connection tq geiser-syntax
geiser-log geiser-popup view scheme modus-vivendi-theme markdown-mode
ibuffer ibuffer-loaddefs rcirc find-dired shell-command+ doc-view
jka-compr image-mode exif pulse color find-func xref wdired flymake-cc
cc-mode cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine
cc-vars cc-defs make-mode char-fold misearch multi-isearch dired-aux
gnus-dired pp vc-mtn vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs
bug-reference magit-ediff ediff ediff-merg ediff-mult ediff-wind
ediff-diff ediff-help ediff-init ediff-util magit-extras mule-util
magit-submodule magit-obsolete magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply magit-wip magit-log which-func imenu
magit-diff smerge-mode git-commit log-edit add-log magit-core
magit-autorevert autorevert filenotify magit-margin magit-transient
magit-process with-editor shell pcomplete server magit-mode transient
edmacro kmacro magit-git magit-section benchmark magit-utils crm dash
cus-start mailalias smtpmail autocrypt-message ecomplete sort smiley
gnus-cite mail-extr textsec uni-scripts idna-mapping ucs-normalize
uni-confusable textsec-check gnus-bcklg qp copyright vc-backup log-view
pcvs-util vc-fossil time-stamp gnus-async gnus-ml autocrypt-gnus
autocrypt nndraft nnmh utf-7 nnfolder epa-file gnutls network-stream nsm
gnus-agent gnus-srvr gnus-score score-mode nnvirtual gnus-msg gnus-art
mm-uu mml2015 mm-view mml-smime smime dig nntp gnus-cache gnus-sum shr
pixel-fill kinsoku url-file url-dired svg dom gnus-group gnus-undo
gnus-start gnus-dbus gnus-cloud nnimap nnmail mail-source utf7 netrc
nnoo parse-time iso8601 gnus-spec gnus-int gnus-range message yank-media
rmc puny rfc822 mml mml-sec epa derived epg rfc6068 epg-config mm-decode
mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader
gnus-win cl-extra noutline outline corfu checkdoc flymake-proc flymake
project warnings thingatpt flyspell ispell auth-source-pass recentf
tree-widget repeat pcase format-spec battery dbus xml dired-x dired
dired-loaddefs time sendmail rfc2047 rfc2045 ietf-drums gnus nnheader
gnus-util time-date mail-utils range mm-util mail-prsvr wid-edit
help-at-pt diff-hl-flydiff diff diff-hl face-remap vc-hg vc-git vc-dir
ewoc vc vc-dispatcher diff-mode easy-mmode hippie-exp winner windmove rx
elec-pair saveplace savehist xt-mouse modus-operandi-theme modus-themes
rot13 disp-table cus-load setup compile text-property-search comint
ansi-color autoload lisp-mnt tex-site geiser-impl help-fns radix-tree
help-mode geiser-custom geiser-base ring slime-autoloads info package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie url-domsuf url-util mailcap url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json map url-vars seq gv subr-x byte-opt bytecomp
byte-compile cconv cl-loaddefs cl-lib iso-transl tooltip eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode
prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu
timer select scroll-bar mouse jit-lock font-lock syntax font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms
cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite emoji-zwj charscript charprop case-table
epa-hook jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice
button loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1276046 170560)
 (symbols 48 52054 48)
 (strings 32 214741 20363)
 (string-bytes 1 6381398)
 (vectors 16 115056)
 (vector-slots 8 2265569 122894)
 (floats 8 774 827)
 (intervals 56 36636 4853)
 (buffers 992 113))

-- 
	Philip Kaludercic

^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-05 17:05 bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications Philip Kaludercic
@ 2022-03-05 19:06 ` Lars Ingebrigtsen
  2022-03-05 20:28   ` Philip Kaludercic
  2022-03-06  9:56 ` Mattias Engdegård
  1 sibling, 1 reply; 10+ messages in thread
From: Lars Ingebrigtsen @ 2022-03-05 19:06 UTC (permalink / raw)
  To: Philip Kaludercic; +Cc: 54263

Philip Kaludercic <philipk@posteo.net> writes:

> I am not certain if this is intended, but the "rgbi:" specifications
> appear to tolerate whitespace
>
>        (color-values-from-color-spec "rgbi:0/0/ 0")
>
> despite not being documented.

If we were designing this function now, then being stricter here would
be a good idea.  But if there's code out there that relies on the
current sloppy parsing, then it'd be problematic to make it stricter.

On the other hand, I think that function was introduced in emacs-28, so
perhaps that's not a concern in practice?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-05 19:06 ` Lars Ingebrigtsen
@ 2022-03-05 20:28   ` Philip Kaludercic
  0 siblings, 0 replies; 10+ messages in thread
From: Philip Kaludercic @ 2022-03-05 20:28 UTC (permalink / raw)
  To: Lars Ingebrigtsen; +Cc: 54263

Lars Ingebrigtsen <larsi@gnus.org> writes:

> Philip Kaludercic <philipk@posteo.net> writes:
>
>> I am not certain if this is intended, but the "rgbi:" specifications
>> appear to tolerate whitespace
>>
>>        (color-values-from-color-spec "rgbi:0/0/ 0")
>>
>> despite not being documented.
>
> If we were designing this function now, then being stricter here would
> be a good idea.  But if there's code out there that relies on the
> current sloppy parsing, then it'd be problematic to make it stricter.
>
> On the other hand, I think that function was introduced in emacs-28, so
> perhaps that's not a concern in practice?

I haven't seen the function being used anywhere up until now (which
doesn't have to mean anything), but considering that this is a
relatively niche edge-case I would say that the bug should either be
solved now or never.

-- 
	Philip Kaludercic





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-05 17:05 bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications Philip Kaludercic
  2022-03-05 19:06 ` Lars Ingebrigtsen
@ 2022-03-06  9:56 ` Mattias Engdegård
  2022-03-06 10:45   ` Philip Kaludercic
  1 sibling, 1 reply; 10+ messages in thread
From: Mattias Engdegård @ 2022-03-06  9:56 UTC (permalink / raw)
  To: Philip Kaludercic; +Cc: 54263, Lars Ingebrigtsen

[-- Attachment #1: Type: text/plain, Size: 285 bytes --]

> I haven't seen the function being used anywhere up until now (which doesn't have to mean anything), but considering that this is a relatively niche edge-case I would say that the bug should either be solved now or never. 

Let's solve it now then. I'm to blame, patch attached.


[-- Attachment #2: 0001-Don-t-accept-leading-whitespace-in-rgbi-colour-specs.patch --]
[-- Type: application/octet-stream, Size: 1888 bytes --]

From 0433c23ce12ea24bcb4de93b92b92070cf257310 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mattias=20Engdeg=C3=A5rd?= <mattiase@acm.org>
Date: Sun, 6 Mar 2022 10:50:27 +0100
Subject: [PATCH] Don't accept leading whitespace in rgbi: colour specs

`color-values-from-color-spec` (new in Emacs 28) erroneously accepted
leading whitespace in rgbi: components.

Reported by Philip Kaludercic.

* src/xfaces.c (parse_float_color_comp): Disallow leading whitespace.
* test/src/xfaces-tests.el
(xfaces-internal-color-values-from-color-spec): Add test case.
---
 src/xfaces.c             | 4 ++++
 test/src/xfaces-tests.el | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/xfaces.c b/src/xfaces.c
index 8100bdb157..7fbc667dfd 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -888,6 +888,10 @@ parse_hex_color_comp (const char *s, const char *e, unsigned short *dst)
 static double
 parse_float_color_comp (const char *s, const char *e)
 {
+  if (s >= e ||
+      !(*s == '0' || *s == '1' || *s == '.' || *s == '+' || *s == '-'))
+    /* No leading whitespace permitted.  */
+    return -1;
   char *end;
   double x = strtod (s, &end);
   return (end == e && x >= 0 && x <= 1) ? x : -1;
diff --git a/test/src/xfaces-tests.el b/test/src/xfaces-tests.el
index 31c0f021b2..1175874144 100644
--- a/test/src/xfaces-tests.el
+++ b/test/src/xfaces-tests.el
@@ -47,7 +47,8 @@ xfaces-internal-color-values-from-color-spec
                  '(0 32768 6554)))
   (should (equal (color-values-from-color-spec "rgbi:1e-3/1.0e-2/1e0")
                  '(66 655 65535)))
-  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil)))
+  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/0/ 0") nil)))
 
 (provide 'xfaces-tests)
 
-- 
2.32.0 (Apple Git-132)


^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06  9:56 ` Mattias Engdegård
@ 2022-03-06 10:45   ` Philip Kaludercic
  2022-03-06 11:12     ` Mattias Engdegård
  0 siblings, 1 reply; 10+ messages in thread
From: Philip Kaludercic @ 2022-03-06 10:45 UTC (permalink / raw)
  To: Mattias Engdegård; +Cc: 54263, Lars Ingebrigtsen

Mattias Engdegård <mattiase@acm.org> writes:

>> I haven't seen the function being used anywhere up until now (which
> doesn't have to mean anything), but considering that this is a
> relatively niche edge-case I would say that the bug should either be
> solved now or never.
>
> Let's solve it now then. I'm to blame, patch attached.

A related question is if something like

  (should (equal (color-values-from-color-spec "rgbi:0/0/0x0") nil))

should be accepted or not.  From looking at xfaces-tests.el I was
surprised to see that the exponential notation was intentional, but
there was no comment or test on the un-lispy 0x... notation that strtod
allows.

> From 0433c23ce12ea24bcb4de93b92b92070cf257310 Mon Sep 17 00:00:00 2001
> From: =?UTF-8?q?Mattias=20Engdeg=C3=A5rd?= <mattiase@acm.org>
> Date: Sun, 6 Mar 2022 10:50:27 +0100
> Subject: [PATCH] Don't accept leading whitespace in rgbi: colour specs
>
> `color-values-from-color-spec` (new in Emacs 28) erroneously accepted
> leading whitespace in rgbi: components.
>
> Reported by Philip Kaludercic.
>
> * src/xfaces.c (parse_float_color_comp): Disallow leading whitespace.
> * test/src/xfaces-tests.el
> (xfaces-internal-color-values-from-color-spec): Add test case.
> ---
>  src/xfaces.c             | 4 ++++
>  test/src/xfaces-tests.el | 3 ++-
>  2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/src/xfaces.c b/src/xfaces.c
> index 8100bdb157..7fbc667dfd 100644
> --- a/src/xfaces.c
> +++ b/src/xfaces.c
> @@ -888,6 +888,10 @@ parse_hex_color_comp (const char *s, const char *e, unsigned short *dst)
>  static double
>  parse_float_color_comp (const char *s, const char *e)
>  {
> +  if (s >= e ||
> +      !(*s == '0' || *s == '1' || *s == '.' || *s == '+' || *s == '-'))
> +    /* No leading whitespace permitted.  */
> +    return -1;
>    char *end;
>    double x = strtod (s, &end);
>    return (end == e && x >= 0 && x <= 1) ? x : -1;
> diff --git a/test/src/xfaces-tests.el b/test/src/xfaces-tests.el
> index 31c0f021b2..1175874144 100644
> --- a/test/src/xfaces-tests.el
> +++ b/test/src/xfaces-tests.el
> @@ -47,7 +47,8 @@ xfaces-internal-color-values-from-color-spec
>                   '(0 32768 6554)))
>    (should (equal (color-values-from-color-spec "rgbi:1e-3/1.0e-2/1e0")
>                   '(66 655 65535)))
> -  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil)))
> +  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil))
> +  (should (equal (color-values-from-color-spec "rgbi:0/0/ 0") nil)))
>  
>  (provide 'xfaces-tests)

-- 
	Philip Kaludercic





^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06 10:45   ` Philip Kaludercic
@ 2022-03-06 11:12     ` Mattias Engdegård
  2022-03-06 11:23       ` Mattias Engdegård
  0 siblings, 1 reply; 10+ messages in thread
From: Mattias Engdegård @ 2022-03-06 11:12 UTC (permalink / raw)
  To: Philip Kaludercic; +Cc: 54263, Lars Ingebrigtsen

[-- Attachment #1: Type: text/plain, Size: 768 bytes --]

6 mars 2022 kl. 11.45 skrev Philip Kaludercic <philipk@posteo.net>:

>  (should (equal (color-values-from-color-spec "rgbi:0/0/0x0") nil))
> 
> should be accepted or not.  From looking at xfaces-tests.el I was
> surprised to see that the exponential notation was intentional, but
> there was no comment or test on the un-lispy 0x... notation that strtod
> allows.

We could disallow hex floats (such as 0x1 or 0XDEFP-16) too, but whether they are un-lispy or not should have no bearing on our decision because we are parsing an external representation that doesn't come from the Lisp world.

Finding an authoritative source for the rgbi: format proved elusive but it doesn't seem that X11 or NS allow hex floats so let's reject them. New patch attached.


[-- Attachment #2: 0001-Don-t-accept-whitespace-or-hex-floats-in-rgbi-colour.patch --]
[-- Type: application/octet-stream, Size: 2068 bytes --]

From 5356a4dd21e2d427cc3c17a0592b30f85b7af1db Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mattias=20Engdeg=C3=A5rd?= <mattiase@acm.org>
Date: Sun, 6 Mar 2022 10:50:27 +0100
Subject: [PATCH] Don't accept whitespace or hex floats in rgbi: colour specs

`color-values-from-color-spec` (new in Emacs 28) erroneously accepted
leading whitespace and hex floats in rgbi: components.

Reported by Philip Kaludercic.

* src/xfaces.c (parse_float_color_comp): Disallow leading whitespace
and hex floats.
* test/src/xfaces-tests.el
(xfaces-internal-color-values-from-color-spec): Add test cases.
---
 src/xfaces.c             | 5 +++++
 test/src/xfaces-tests.el | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/xfaces.c b/src/xfaces.c
index 8100bdb157..d43e2936a9 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -888,6 +888,11 @@ parse_hex_color_comp (const char *s, const char *e, unsigned short *dst)
 static double
 parse_float_color_comp (const char *s, const char *e)
 {
+  if (s >= e
+      || !(*s == '0' || *s == '1' || *s == '.' || *s == '+' || *s == '-')
+      || (s + 1 < e && (s[1] == 'x' || s[1] == 'X')))
+    /* No leading whitespace or hex floats permitted.  */
+    return -1;
   char *end;
   double x = strtod (s, &end);
   return (end == e && x >= 0 && x <= 1) ? x : -1;
diff --git a/test/src/xfaces-tests.el b/test/src/xfaces-tests.el
index 31c0f021b2..fc0e731db4 100644
--- a/test/src/xfaces-tests.el
+++ b/test/src/xfaces-tests.el
@@ -47,7 +47,9 @@ xfaces-internal-color-values-from-color-spec
                  '(0 32768 6554)))
   (should (equal (color-values-from-color-spec "rgbi:1e-3/1.0e-2/1e0")
                  '(66 655 65535)))
-  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil)))
+  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/0/ 0") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/0x0/0") nil)))
 
 (provide 'xfaces-tests)
 
-- 
2.32.0 (Apple Git-132)


^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06 11:12     ` Mattias Engdegård
@ 2022-03-06 11:23       ` Mattias Engdegård
  2022-03-06 12:47         ` Eli Zaretskii
  0 siblings, 1 reply; 10+ messages in thread
From: Mattias Engdegård @ 2022-03-06 11:23 UTC (permalink / raw)
  To: Mattias Engdegård; +Cc: 54263, Philip Kaludercic, Lars Ingebrigtsen

[-- Attachment #1: Type: text/plain, Size: 124 bytes --]

The previous patch erroneously accepted "rgbi:0/+0x0/0". Here is one that doesn't try to be clever.
Clear for emacs-28?


[-- Attachment #2: 0001-Don-t-accept-whitespace-or-hex-floats-in-rgbi-colour.patch --]
[-- Type: application/octet-stream, Size: 2151 bytes --]

From e7bc68ae2f8e78278280a11d0392f52226f50449 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mattias=20Engdeg=C3=A5rd?= <mattiase@acm.org>
Date: Sun, 6 Mar 2022 10:50:27 +0100
Subject: [PATCH] Don't accept whitespace or hex floats in rgbi: colour specs

`color-values-from-color-spec` (new in Emacs 28) erroneously accepted
leading whitespace and hex floats in rgbi: components.

Reported by Philip Kaludercic.

* src/xfaces.c (parse_float_color_comp): Disallow leading whitespace
and hex floats.
* test/src/xfaces-tests.el
(xfaces-internal-color-values-from-color-spec): Add test cases.
---
 src/xfaces.c             | 5 +++++
 test/src/xfaces-tests.el | 5 ++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/xfaces.c b/src/xfaces.c
index 8100bdb157..1d2e2489de 100644
--- a/src/xfaces.c
+++ b/src/xfaces.c
@@ -888,6 +888,11 @@ parse_hex_color_comp (const char *s, const char *e, unsigned short *dst)
 static double
 parse_float_color_comp (const char *s, const char *e)
 {
+  /* Only allow decimal float literals without whitespace.  */
+  for (const char *p = s; p < e; p++)
+    if (!((*p >= '0' && *p <= '9')
+	  || *p == '.' || *p == '+' || *p == '-' || *p == 'e' || *p == 'E'))
+      return -1;
   char *end;
   double x = strtod (s, &end);
   return (end == e && x >= 0 && x <= 1) ? x : -1;
diff --git a/test/src/xfaces-tests.el b/test/src/xfaces-tests.el
index 31c0f021b2..16f1653791 100644
--- a/test/src/xfaces-tests.el
+++ b/test/src/xfaces-tests.el
@@ -47,7 +47,10 @@ xfaces-internal-color-values-from-color-spec
                  '(0 32768 6554)))
   (should (equal (color-values-from-color-spec "rgbi:1e-3/1.0e-2/1e0")
                  '(66 655 65535)))
-  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil)))
+  (should (equal (color-values-from-color-spec "rgbi:0/0.5/10") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/0/ 0") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/0x0/0") nil))
+  (should (equal (color-values-from-color-spec "rgbi:0/+0x1/0") nil)))
 
 (provide 'xfaces-tests)
 
-- 
2.32.0 (Apple Git-132)


^ permalink raw reply related	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06 11:23       ` Mattias Engdegård
@ 2022-03-06 12:47         ` Eli Zaretskii
  2022-03-06 13:08           ` Mattias Engdegård
  0 siblings, 1 reply; 10+ messages in thread
From: Eli Zaretskii @ 2022-03-06 12:47 UTC (permalink / raw)
  To: Mattias Engdegård; +Cc: 54263, philipk, larsi

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Sun, 6 Mar 2022 12:23:46 +0100
> Cc: 54263@debbugs.gnu.org, Philip Kaludercic <philipk@posteo.net>,
>  Lars Ingebrigtsen <larsi@gnus.org>
> 
> The previous patch erroneously accepted "rgbi:0/+0x0/0". Here is one that doesn't try to be clever.
> Clear for emacs-28?

I see no reason to install this on the release branch.  It is not a
recent regression, and there are no specific bug reports for it.

So please install the fix for this on master.

Thanks.






^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06 12:47         ` Eli Zaretskii
@ 2022-03-06 13:08           ` Mattias Engdegård
  2022-03-06 14:06             ` Eli Zaretskii
  0 siblings, 1 reply; 10+ messages in thread
From: Mattias Engdegård @ 2022-03-06 13:08 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: Philip Kaludercic, 54263-done, Lars Ingebrigtsen

6 mars 2022 kl. 13.47 skrev Eli Zaretskii <eliz@gnu.org>:

> I see no reason to install this on the release branch.  It is not a
> recent regression, and there are no specific bug reports for it.

The function is new in Emacs 28; installing the change on master means that we reject previously accepted input instead of making the function behave the way we want from the start. But better late than never, I suppose.
Pushed to master.






^ permalink raw reply	[flat|nested] 10+ messages in thread

* bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications
  2022-03-06 13:08           ` Mattias Engdegård
@ 2022-03-06 14:06             ` Eli Zaretskii
  0 siblings, 0 replies; 10+ messages in thread
From: Eli Zaretskii @ 2022-03-06 14:06 UTC (permalink / raw)
  To: Mattias Engdegård; +Cc: philipk, 54263-done, larsi

> Feedback-ID:mattiase@acm.or
> From: Mattias Engdegård <mattiase@acm.org>
> Date: Sun, 6 Mar 2022 14:08:20 +0100
> Cc: 54263-done@debbugs.gnu.org, Philip Kaludercic <philipk@posteo.net>,
>         Lars Ingebrigtsen <larsi@gnus.org>
> 
> 6 mars 2022 kl. 13.47 skrev Eli Zaretskii <eliz@gnu.org>:
> 
> > I see no reason to install this on the release branch.  It is not a
> > recent regression, and there are no specific bug reports for it.
> 
> The function is new in Emacs 28; installing the change on master means that we reject previously accepted input instead of making the function behave the way we want from the start. But better late than never, I suppose.
> Pushed to master.

Thanks.  Like I said, I see no reason to hurry with this fix, but we
could consider it for backporting to the emacs-28 branch once Emacs
28.1 is released.





^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2022-03-06 14:06 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-03-05 17:05 bug#54263: 29.0.50; color-values-from-color-spec accepts whitespace in rgbi: specifications Philip Kaludercic
2022-03-05 19:06 ` Lars Ingebrigtsen
2022-03-05 20:28   ` Philip Kaludercic
2022-03-06  9:56 ` Mattias Engdegård
2022-03-06 10:45   ` Philip Kaludercic
2022-03-06 11:12     ` Mattias Engdegård
2022-03-06 11:23       ` Mattias Engdegård
2022-03-06 12:47         ` Eli Zaretskii
2022-03-06 13:08           ` Mattias Engdegård
2022-03-06 14:06             ` Eli Zaretskii

Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/emacs.git
	https://git.savannah.gnu.org/cgit/emacs/org-mode.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.