GNU bug report logs - #75322
SAFE_ALLOCA assumed to root Lisp_Objects/SSDATA(string)

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Message #125 received at 75322 <at> debbugs.gnu.org (full text, mbox):

From: Pip Cet <pipcet <at> protonmail.com>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 75322 <at> debbugs.gnu.org
Subject: Re: bug#75322: SAFE_ALLOCA assumed to root Lisp_Objects/SSDATA(string)
Date: Sun, 05 Jan 2025 10:35:12 +0000

Gerd Möllmann <gerd.moellmann <at> gmail.com> writes:

> If "these two" means xstrdup and my SAFE_NALLOCA change, then yes, kind
> of. It doesn't harm to do both, but it's not strictly necessary to do
> xstrdup if the SAFE_NALLOCA change is in. The other way round is not

For argv, I agree, but make_environment_block uses xnmalloc and assumes
SDATA pointers in there will survive, which they don't, according to my
GDB log.

It was very brave not to start out by making every xmalloc an ambiguous
root and fixing only those that we know to be safe :-)

Pip

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