From: Eli Zaretskii <eliz@gnu.org>
To: "Daniel Martín" <mardani29@yahoo.es>, "Alan Third" <alan@idiocy.org>
Cc: 51105@debbugs.gnu.org
Subject: bug#51105: 29.0.50; Buffer overflow bug in ns_compute_glyph_string_overhangs
Date: Sat, 09 Oct 2021 14:43:18 +0300 [thread overview]
Message-ID: <83v926whih.fsf@gnu.org> (raw)
In-Reply-To: <m1r1cu4imr.fsf@yahoo.es> (message from Daniel Martín on Sat, 09 Oct 2021 12:06:36 +0200)
> From: Daniel Martín <mardani29@yahoo.es>
> Cc: 51105@debbugs.gnu.org
> Date: Sat, 09 Oct 2021 12:06:36 +0200
>
> Now I think that the right thing to do may be to modify nsterm.m, switch
> on the glyph type and, if the glyph type is COMPOSITE_GLYPH, call
> composition_gstring_width to get the glyph metrics. Function
> composition_gstring_width uses the values from fields s->cmp_from and
> s->cmp_to, and would avoid the buffer overflow:
>
> (lldb) fr v s->cmp_from
> (int) s->cmp_from = 6
> (lldb) fr v s->cmp_to
> (int) s->cmp_to = 7
>
> WDYT? I can prepare a patch of this type if you agree.
SGTM, but I'd like to hear Alan's opinion as well, as I don't feel I
know enough about the NS display backend.
next prev parent reply other threads:[~2021-10-09 11:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <m17den59au.fsf.ref@yahoo.es>
2021-10-09 0:30 ` bug#51105: 29.0.50; Buffer overflow bug in ns_compute_glyph_string_overhangs Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-10-09 6:40 ` Eli Zaretskii
2021-10-09 10:06 ` Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-10-09 11:43 ` Eli Zaretskii [this message]
2021-10-09 13:57 ` Alan Third
2021-10-09 19:35 ` Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-10-09 19:41 ` Daniel Martín via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-11-05 2:39 ` Lars Ingebrigtsen
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