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bug#62009: 29.0.60; Emacs crashes on setf symbol-name
From: |
Eli Zaretskii |
Subject: |
bug#62009: 29.0.60; Emacs crashes on setf symbol-name |
Date: |
Tue, 07 Mar 2023 19:39:51 +0200 |
> Cc: Stefan Monnier <monnier@iro.umontreal.ca>, 62009@debbugs.gnu.org
> Date: Tue, 7 Mar 2023 18:08:43 +0100
> From: Daniel Mendler <mail@daniel-mendler.de>
>
> On 3/7/23 16:45, Michael Heerdegen wrote:
> > Daniel Mendler <mail@daniel-mendler.de> writes:
> >
> >> Execute the following in the scratch buffer:
> >>
> >> (setf (aref (symbol-name 'car) 1) ?o)
> >>
> >> Emacs crashes with a segmentation fault. Is this a well-known issue? I
> >> could reproduce the problem on Emacs 27 and 29. Should there be some
> >> mechanism to protect the strings of symbols?
> >
> > Maybe the outcome was something like that we can't protect everybody in
> > every case from shooting in the own foot, I don't recall.
>
> Maybe it would be possible to introduce a flag which marks strings as
> "frozen"? Then we could ensure that no mutations of such frozen string
> happen.
AFAICT, they _are_ frozen. These names are in read-only memory, where
you cannot write. That's why Emacs crashes, AFAIU: the code is trying
to write to protected memory.
Just don't do that, cause it's gonna hurt...
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/06
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Ruijie Yu, 2023/03/07
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Michael Heerdegen, 2023/03/07
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/07
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name,
Eli Zaretskii <=
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Philip Kaludercic, 2023/03/09
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Augusto Stoffel, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Augusto Stoffel, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Eli Zaretskii, 2023/03/10
- bug#62009: 29.0.60; Emacs crashes on setf symbol-name, Daniel Mendler, 2023/03/10