GNU bug report logs - #62009
29.0.60; Emacs crashes on setf symbol-name

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Message #83 received at 62009 <at> debbugs.gnu.org (full text, mbox):

From: Daniel Mendler <mail <at> daniel-mendler.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: philipk <at> posteo.net, michael_heerdegen <at> web.de, rpluim <at> gmail.com,
 gregory <at> heytings.org, monnier <at> iro.umontreal.ca, 62009 <at> debbugs.gnu.org,
 arstoffel <at> gmail.com
Subject: Re: bug#62009: 29.0.60; Emacs crashes on setf symbol-name
Date: Fri, 10 Mar 2023 13:24:08 +0100

On 3/10/23 13:13, Eli Zaretskii wrote:
>> Date: Fri, 10 Mar 2023 12:36:17 +0100
>> Cc: Gregory Heytings <gregory <at> heytings.org>,
>>  Philip Kaludercic <philipk <at> posteo.net>, michael_heerdegen <at> web.de,
>>  monnier <at> iro.umontreal.ca, 62009 <at> debbugs.gnu.org, Eli Zaretskii
>>  <eliz <at> gnu.org>, Augusto Stoffel <arstoffel <at> gmail.com>
>> From: Daniel Mendler <mail <at> daniel-mendler.de>
>>
>>>       /* Number of characters in string; MSB is used as the mark bit.  */
>>>       ptrdiff_t size;
>>>       /* If nonnegative, number of bytes in the string (which is multibyte).
>>> 	 If negative, the string is unibyte:
>>> 	 -1 for data normally allocated
>>> 	 -2 for data in rodata (C string constants)
>>> 	 -3 for data that must be immovable (used for bytecode)  */
>>>       ptrdiff_t size_byte;
>>
>> Thanks! That's good. Given that a read only flag already exists, it is
>> easy to fix the issue. We just have to make sure that the size is
>> negative for the symbol names and add a check in `aset`.
> 
> Let's not do that!

Why not? There won't be a performance cost.

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