GNU bug report logs - #74966
31.0.50; Crash report (using igc on macOS)

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Package: emacs;

Reported by: Sean Devlin <spd <at> toadstyle.org>

Date: Thu, 19 Dec 2024 09:19:02 UTC

Severity: normal

Found in version 31.0.50

Done: Pip Cet <pipcet <at> protonmail.com>

Bug is archived. No further changes may be made.

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Message #161 received at 74966 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Pip Cet <pipcet <at> protonmail.com>
Cc: Gerd Möllmann <gerd.moellmann <at> gmail.com>,
 spd <at> toadstyle.org, Eli Zaretskii <eliz <at> gnu.org>, acorallo <at> gnu.org,
 74966 <at> debbugs.gnu.org
Subject: Re: bug#74966: 31.0.50; Crash report (using igc on macOS)
Date: Sat, 21 Dec 2024 09:26:24 -0500

>> `offset` here should be fixnum that gives the position of this docstring
>> in the DOC file.  And FUN should be a function for which we found
>
> Yes, but the nativecomp code assumes ->doc is an index into a
> nativecomp'd subr's constant vector.

Aha!

> So we overwrite it with a docfile
> index, access an out-of-bounds index and crash.
>
> I think the best thing to do is to use separate fields for the "offset"
> doc and the "index" doc; or at least, the second best thing, after
> removing the entire docfile hack.

I think a much simpler change is to use the sign bit to distinguish indices
into the constant vector from indices into the DOC file.


        Stefan
This bug report was last modified 130 days ago.

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